From patchwork Mon Nov 6 20:25:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79228 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 499543857347 for ; Mon, 6 Nov 2023 20:26:15 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x112b.google.com (mail-yw1-x112b.google.com [IPv6:2607:f8b0:4864:20::112b]) by sourceware.org (Postfix) with ESMTPS id 66FD53858CDB for ; Mon, 6 Nov 2023 20:26:01 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 66FD53858CDB Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 66FD53858CDB Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::112b ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302362; cv=none; b=CA40IMyjAkriQb+BjCQ/KMvoesEKeNeAK7mblDjmbxhORYRpX4bq0R+QPB5+k2nUK69nJLxLbNLy/aK7S+X9WqihxlCjLWZ2q2mZ0Zq16MmVfBFSYSUmTfEuAqgf2K/PkwKvf0p17XmLEPe0OVJmmhmehoavcW27a+zW74mhRDA= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302362; c=relaxed/simple; bh=Z+Q65c2KgPXJiQvNU9zYIX00gatgiQffUy66t6qwvqs=; h=DKIM-Signature:From:To:Subject:Date:Message-Id:MIME-Version; b=OEL8N3vHtBLlKbqJafWzwg3Jicmvo/JdD/jniGC+guHM5kOX2sR8+p9fcVLKB5UdPKb3wJBcxS03+hW4Is+5qHp6JOmzaZNauGChYdP5ZcZ1Ob4os+ks+tRfLjyCPLvhAXkWfmSjGAmHs8QcE6L5HgTGg3DZUql6n4dOIn3xzbg= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yw1-x112b.google.com with SMTP id 00721157ae682-5a7afd45199so59236527b3.0 for ; Mon, 06 Nov 2023 12:26:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699302360; x=1699907160; darn=sourceware.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=ZNo3RMtxxUUYe2oJL8ABVJZaH14s4wpvQnBQDQ06lMY=; b=t2rjl+HnqiUL4EOJgPQxoKfdwFvKvhoN7M8MZhLPLBNyKf0GtUrzZQVHpxH+3HrqK9 W+9XZIrEOhdQFR5y+nZBQv+klB3r+ph7SV9UisQPbQnxq0rrQTg//qJpvVXrHIc+PCsw tCh5e0hCl8pwE+QkMaZlCivezIkxPlzG7p+z5JNc46YL8IEFvkUfVaFLprpEuWWsuz8q afvHtUgoPS0jH23/6UQ03yexCxVdJFld7PL6ufDp+LAuegllBkXBGgIj76d/E4l3pIb8 kq5jzyLbtD+u9IfcFCCq6Frjb8IbyQjbAWNfT7Eai31JsL0jcncdOFoUox8ps0vtqzgs /GFw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699302360; x=1699907160; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ZNo3RMtxxUUYe2oJL8ABVJZaH14s4wpvQnBQDQ06lMY=; b=BsvOZP6febu84QNLoJSE2kEUh8Tbae9X/rgAVj5xzTwT0pOTXLFfUI+nGtlpqb0EL9 xSo6ax2D1C4MMZxUB9uE/NWVsuBtR17JG+Kcn3WNcpKsiAOmI/7dRzzWvvuhRLSe+ToG ZXKEl8cDXP8Vx7M1Ztce86Xza2yMhg46MpEtsGXP3gVdzYBjNmeAbLlxrgfVlPggDCjx b2QLVKYkvXTL2ba6cdi9A2nQAXuhCKrJ9NUOKm49LiEzS74Tw2XieafuyJvfD7kI0/+S /G3s2ONnPqSzwFPg+/ioQXj1lcLk+u+jr9yS1yZZB+qUPD55LkL55Jv8sfpmyW9M2Szy dIxg== X-Gm-Message-State: AOJu0YxDQyv3fGI58VJaTVgeu18s5oID50lmf67d5Lt9SRnpy4tgK+Cd ny37YYiKDIkxnnbuorYYLcIAl71KRjbnqx3TQOBnbw== X-Google-Smtp-Source: AGHT+IH86zS824y8gUInVjBGJzg6um2QifHP9nLSOPRR/CpGlCJCJAib+uB+VdJzpj1klWJOqMaAXw== X-Received: by 2002:a81:6903:0:b0:5a8:960d:9aef with SMTP id e3-20020a816903000000b005a8960d9aefmr11762057ywc.49.1699302360011; Mon, 06 Nov 2023 12:26:00 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.25.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:25:59 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 01/19] elf: Remove /etc/suid-debug support Date: Mon, 6 Nov 2023 17:25:34 -0300 Message-Id: <20231106202552.3404059-2-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Since malloc debug support moved to a different library (libc_malloc_debug.so), the glibc.malloc.check requires preloading the debug library to enable it. It means that suid-debug support has not been working since 2.34. To restore its support, it would require to add additional information and parsing to where to find libc_malloc_debug.so. It is one thing less that might change AT_SECURE binaries' behavior due to environment configurations. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/dl-tunables.c | 16 ---------------- elf/rtld.c | 3 +-- manual/memory.texi | 4 +--- manual/tunables.texi | 4 +--- 4 files changed, 3 insertions(+), 24 deletions(-) diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index cae67efa0a..24252af22c 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -252,20 +252,6 @@ parse_tunables (char *tunestr, char *valstring) tunestr[off] = '\0'; } -/* Enable the glibc.malloc.check tunable in SETUID/SETGID programs only when - the system administrator has created the /etc/suid-debug file. This is a - special case where we want to conditionally enable/disable a tunable even - for setuid binaries. We use the special version of access() to avoid - setting ERRNO, which is a TLS variable since TLS has not yet been set - up. */ -static __always_inline void -maybe_enable_malloc_check (void) -{ - tunable_id_t id = TUNABLE_ENUM_NAME (glibc, malloc, check); - if (__libc_enable_secure && __access_noerrno ("/etc/suid-debug", F_OK) == 0) - tunable_list[id].security_level = TUNABLE_SECLEVEL_NONE; -} - /* Initialize the tunables list from the environment. For now we only use the ENV_ALIAS to find values. Later we will also use the tunable names to find values. */ @@ -277,8 +263,6 @@ __tunables_init (char **envp) size_t len = 0; char **prev_envp = envp; - maybe_enable_malloc_check (); - while ((envp = get_next_env (envp, &envname, &len, &envval, &prev_envp)) != NULL) { diff --git a/elf/rtld.c b/elf/rtld.c index 5107d16fe3..51b6d9f326 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -2670,8 +2670,7 @@ process_envvars (struct dl_main_state *state) } while (*nextp != '\0'); - if (__access ("/etc/suid-debug", F_OK) != 0) - GLRO(dl_debug_mask) = 0; + GLRO(dl_debug_mask) = 0; if (state->mode != rtld_mode_normal) _exit (5); diff --git a/manual/memory.texi b/manual/memory.texi index 5781a64f35..258fdbd3a0 100644 --- a/manual/memory.texi +++ b/manual/memory.texi @@ -1379,9 +1379,7 @@ There is one problem with @code{MALLOC_CHECK_}: in SUID or SGID binaries it could possibly be exploited since diverging from the normal programs behavior it now writes something to the standard error descriptor. Therefore the use of @code{MALLOC_CHECK_} is disabled by default for -SUID and SGID binaries. It can be enabled again by the system -administrator by adding a file @file{/etc/suid-debug} (the content is -not important it could be empty). +SUID and SGID binaries. So, what's the difference between using @code{MALLOC_CHECK_} and linking with @samp{-lmcheck}? @code{MALLOC_CHECK_} is orthogonal with respect to diff --git a/manual/tunables.texi b/manual/tunables.texi index 776fd93fd9..347b5698b5 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -136,9 +136,7 @@ termination of the process. Like @env{MALLOC_CHECK_}, @code{glibc.malloc.check} has a problem in that it diverges from normal program behavior by writing to @code{stderr}, which could by exploited in SUID and SGID binaries. Therefore, @code{glibc.malloc.check} -is disabled by default for SUID and SGID binaries. This can be enabled again -by the system administrator by adding a file @file{/etc/suid-debug}; the -content of the file could be anything or even empty. +is disabled by default for SUID and SGID binaries. @end deftp @deftp Tunable glibc.malloc.top_pad From patchwork Mon Nov 6 20:25:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79229 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 24D92385C41F for ; Mon, 6 Nov 2023 20:26:21 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x1134.google.com (mail-yw1-x1134.google.com [IPv6:2607:f8b0:4864:20::1134]) by sourceware.org (Postfix) with ESMTPS id 451513858C5E for ; Mon, 6 Nov 2023 20:26:03 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 451513858C5E Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 451513858C5E Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::1134 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302364; cv=none; b=IDHw0ut0lYIiUzqrcoFrV2Yi3sPj8BVvpA2xW6FoYtKTPKd3sx8gVzEjjbWcFUh4dvozmAvpLL0koV4uAEzPVjIgXF7YEXCA+Zhmdqw7B5IxUx2gc/A+XMSNY0DGSwu/O2Nr7VzTF4904RjGWyLAQfh7GNDHaImmmoZv6X0r6yk= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302364; c=relaxed/simple; bh=OKUD/2lFPcVvxRUkXmamLbtzYo3WNGkXnSD+xfFQYGo=; h=DKIM-Signature:From:To:Subject:Date:Message-Id:MIME-Version; b=NiYTQMD/r293u/6xZYBv7HQD8kHWDL/miuUueyxgs1Jktv6gCjMD9QFvRay7kVqpBqrZEcfpV82xoOOXTQlmyiD4iC1mQyeb22Uf1UAqW8v5VOMiQi2LJ3+ejsIbpTDVzfCr9s5qZFEtSMcOvFoYnYGTppEd+eAn8pbyTX9aL6k= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yw1-x1134.google.com with SMTP id 00721157ae682-5afa5dbc378so53181757b3.0 for ; Mon, 06 Nov 2023 12:26:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699302362; x=1699907162; darn=sourceware.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=esjAsFKyq1qOv7OubaudS7wN9qGWBRX0L7Tv1Wq1oWQ=; b=C8wjjsrRlMPl4rrId60bjyVTnUuky8P2AARgc3nl6i2oFvUgH7C3TmVKnL9CT/xZZf +le0cbKxb0aEx0MInRxyOCxRgR+9v7juKwve4G4uVaH185dUqDPUcyyP5zq4Ja2/ZUih Tu1Rj3cluieeEAhXJjtwSnuEkFHacTW4LgQ9rMb3NE1X4TVdeT4GDaoor6VjZQyxOUUQ X6S+sJ8U5qrPlM7qIsbadISonrPaVDZBZ5G8Ij6K2C5Lt87bhEeiUmrlVzJs3IoqhaTl KIYKK5Fd5gOmO6ATjuivFfch1SKzpG/mCbLmE1xvcbhgeR/BKT1TrliOE/EPs+bqg9+k 1ykA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699302362; x=1699907162; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=esjAsFKyq1qOv7OubaudS7wN9qGWBRX0L7Tv1Wq1oWQ=; b=HXd9e0X3jgiHRN4jic4KFyWTH3ThfGEoWT4YVb8hgPcaUm72TghrjXq7bkjWQ9Wrmf PEp9oYF1CnWvgWdu1CZimQ93pCerOME1eBxvu8osEUXnWe/xYfxplV8inyXNfiKkq9T+ BMPi+RDFmKVEl6Xsi74wr/pHpEiYJQDXE76eCoxtfNw9T4w6+1ds/HXLPY5CVIAJBkpI 9+Ix9S/dXjFM+pmKjS3mGjuSXb65Tl6q9aIorBj7FUc/IqdM0VS2HDrB1NZZU+mrXdz1 dzVEN9DnjecZdAW0l950DK0KrLwQxj4VoVs0PIvDEV13BDvk2NPq4WiLTWZZLYXIiVUZ N95Q== X-Gm-Message-State: AOJu0Ywu796CgAOQJX2gWbO5MhyVHgdKmUahJ2NJLmxjjqEbYqo6kVui tlfUHNwctwR3w3LQjPM8pt2/CovIDh99dCOLEgfFXw== X-Google-Smtp-Source: AGHT+IF9SDomPfU4WR6ZIxLha9yPvzq03W8ZbCCiUnTDR5zTETLVD1tT54xGdAbnRJodxr2FndzRCw== X-Received: by 2002:a81:9b50:0:b0:592:2a17:9d88 with SMTP id s77-20020a819b50000000b005922a179d88mr8132166ywg.47.1699302362213; Mon, 06 Nov 2023 12:26:02 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:01 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Cc: Florian Weimer Subject: [PATCH v3 02/19] elf: Add GLIBC_TUNABLES to unsecvars Date: Mon, 6 Nov 2023 17:25:35 -0300 Message-Id: <20231106202552.3404059-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org setuid/setgid process now ignores any glibc tunables, and filters out all environment variables that might changes its behavior. This patch also adds GLIBC_TUNABLES, so any spawned process by setuid/setgid processes should set tunable explicitly. Checked on x86_64-linux-gnu. Reviewed-by: Florian Weimer Reviewed-by: Siddhesh Poyarekar --- elf/tst-env-setuid-tunables.c | 32 ++++---------------------------- sysdeps/generic/unsecvars.h | 1 + 2 files changed, 5 insertions(+), 28 deletions(-) diff --git a/elf/tst-env-setuid-tunables.c b/elf/tst-env-setuid-tunables.c index f0b92c97e7..2603007b7b 100644 --- a/elf/tst-env-setuid-tunables.c +++ b/elf/tst-env-setuid-tunables.c @@ -60,45 +60,21 @@ const char *teststrings[] = "glibc.not_valid.check=2", }; -const char *resultstrings[] = -{ - "glibc.malloc.mmap_threshold=4096", - "glibc.malloc.mmap_threshold=4096", - "glibc.malloc.mmap_threshold=4096", - "glibc.malloc.perturb=0x800", - "glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096", - "glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096", - "glibc.malloc.mmap_threshold=4096", - "glibc.malloc.mmap_threshold=4096", - "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096", - "", - "", - "", - "", - "", - "", - "", -}; - static int test_child (int off) { const char *val = getenv ("GLIBC_TUNABLES"); + int ret = 1; printf (" [%d] GLIBC_TUNABLES is %s\n", off, val); fflush (stdout); - if (val != NULL && strcmp (val, resultstrings[off]) == 0) - return 0; - if (val != NULL) - printf (" [%d] Unexpected GLIBC_TUNABLES VALUE %s, expected %s\n", - off, val, resultstrings[off]); + printf (" [%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val); else - printf (" [%d] GLIBC_TUNABLES environment variable absent\n", off); - + ret = 0; fflush (stdout); - return 1; + return ret; } static int diff --git a/sysdeps/generic/unsecvars.h b/sysdeps/generic/unsecvars.h index 8278c50a84..81397fb90b 100644 --- a/sysdeps/generic/unsecvars.h +++ b/sysdeps/generic/unsecvars.h @@ -4,6 +4,7 @@ #define UNSECURE_ENVVARS \ "GCONV_PATH\0" \ "GETCONF_DIR\0" \ + "GLIBC_TUNABLES\0" \ "HOSTALIASES\0" \ "LD_AUDIT\0" \ "LD_DEBUG\0" \ From patchwork Mon Nov 6 20:25:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79231 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id CEC273857004 for ; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:03 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Cc: DJ Delorie Subject: [PATCH v3 03/19] elf: Ignore GLIBC_TUNABLES for setuid/setgid binaries Date: Mon, 6 Nov 2023 17:25:36 -0300 Message-Id: <20231106202552.3404059-4-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org The tunable privilege levels were a retrofit to try and keep the malloc tunable environment variables' behavior unchanged across security boundaries. However, CVE-2023-4911 shows how tricky can be tunable parsing in a security-sensitive environment. Not only parsing, but the malloc tunable essentially changes some semantics on setuid/setgid processes. Although it is not a direct security issue, allowing users to change setuid/setgid semantics is not a good security practice, and requires extra code and analysis to check if each tunable is safe to use on all security boundaries. It also means that security opt-in features, like aarch64 MTE, would need to be explicit enabled by an administrator with a wrapper script or with a possible future system-wide tunable setting. Co-authored-by: Siddhesh Poyarekar Reviewed-by: DJ Delorie --- elf/Makefile | 5 +- elf/dl-tunable-types.h | 10 -- elf/dl-tunables.c | 127 ++++----------- elf/dl-tunables.list | 17 -- elf/tst-env-setuid-tunables.c | 29 +++- elf/tst-tunables.c | 244 +++++++++++++++++++++++++++++ manual/README.tunables | 9 -- scripts/gen-tunables.awk | 18 +-- sysdeps/x86_64/64/dl-tunables.list | 1 - 9 files changed, 299 insertions(+), 161 deletions(-) create mode 100644 elf/tst-tunables.c diff --git a/elf/Makefile b/elf/Makefile index b46dee1c16..5f24a00a92 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -263,7 +263,6 @@ tests-static-normal := \ tst-dl-iter-static \ tst-dst-static \ tst-env-setuid \ - tst-env-setuid-tunables \ tst-getauxval-static \ tst-linkall-static \ tst-single_threaded-pthread-static \ @@ -276,10 +275,12 @@ tests-static-normal := \ tests-static-internal := \ tst-dl-printf-static \ tst-dl_find_object-static \ + tst-env-setuid-tunables \ tst-ptrguard1-static \ tst-stackguard1-static \ tst-tls1-static \ tst-tls1-static-non-pie \ + tst-tunables \ # tests-static-internal CRT-tst-tls1-static-non-pie := $(csu-objpfx)crt1.o @@ -2658,6 +2659,8 @@ $(objpfx)tst-glibc-hwcaps-mask.out: \ # tst-glibc-hwcaps-cache. $(objpfx)tst-glibc-hwcaps-cache.out: $(objpfx)tst-glibc-hwcaps +tst-tunables-ARGS = -- $(host-test-program-cmd) + $(objpfx)list-tunables.out: tst-rtld-list-tunables.sh $(objpfx)ld.so $(SHELL) $< $(objpfx)ld.so '$(test-wrapper-env)' \ '$(run_program_env)' > $(objpfx)/tst-rtld-list-tunables.out diff --git a/elf/dl-tunable-types.h b/elf/dl-tunable-types.h index c88332657e..62d6d9e629 100644 --- a/elf/dl-tunable-types.h +++ b/elf/dl-tunable-types.h @@ -64,16 +64,6 @@ struct _tunable tunable_val_t val; /* The value. */ bool initialized; /* Flag to indicate that the tunable is initialized. */ - tunable_seclevel_t security_level; /* Specify the security level for the - tunable with respect to AT_SECURE - programs. See description of - tunable_seclevel_t to see a - description of the values. - - Note that even if the tunable is - read, it may not get used by the - target module if the value is - considered unsafe. */ /* Compatibility elements. */ const char env_alias[TUNABLE_ALIAS_MAX]; /* The compatibility environment variable name. */ diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index 24252af22c..f7dca8f7c1 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -154,50 +154,51 @@ __tunable_set_val (tunable_id_t id, tunable_val_t *valp, tunable_num_t *minp, do_tunable_update_val (cur, valp, minp, maxp); } -/* Parse the tunable string TUNESTR and adjust it to drop any tunables that may - be unsafe for AT_SECURE processes so that it can be used as the new - environment variable value for GLIBC_TUNABLES. VALSTRING is the original - environment variable string which we use to make NULL terminated values so - that we don't have to allocate memory again for it. */ +/* Parse the tunable string VALSTRING. VALSTRING is a duplicated value, + where delimiters ':' are replaced with '\0', so string tunables are null + terminated. */ static void -parse_tunables (char *tunestr, char *valstring) +parse_tunables (char *valstring) { - if (tunestr == NULL || *tunestr == '\0') + if (valstring == NULL || *valstring == '\0') return; - char *p = tunestr; - size_t off = 0; + char *p = valstring; + bool done = false; - while (true) + while (!done) { char *name = p; - size_t len = 0; /* First, find where the name ends. */ - while (p[len] != '=' && p[len] != ':' && p[len] != '\0') - len++; + while (*p != '=' && *p != ':' && *p != '\0') + p++; /* If we reach the end of the string before getting a valid name-value pair, bail out. */ - if (p[len] == '\0') + if (*p == '\0') break; /* We did not find a valid name-value pair before encountering the colon. */ - if (p[len]== ':') + if (*p == ':') { - p += len + 1; + p++; continue; } - p += len + 1; + /* Skip the '='. */ + p++; - /* Take the value from the valstring since we need to NULL terminate it. */ - char *value = &valstring[p - tunestr]; - len = 0; + const char *value = p; - while (p[len] != ':' && p[len] != '\0') - len++; + while (*p != ':' && *p != '\0') + p++; + + if (*p == '\0') + done = true; + else + *p++ = '\0'; /* Add the tunable if it exists. */ for (size_t i = 0; i < sizeof (tunable_list) / sizeof (tunable_t); i++) @@ -206,50 +207,11 @@ parse_tunables (char *tunestr, char *valstring) if (tunable_is_name (cur->name, name)) { - /* If we are in a secure context (AT_SECURE) then ignore the - tunable unless it is explicitly marked as secure. Tunable - values take precedence over their envvar aliases. We write - the tunables that are not SXID_ERASE back to TUNESTR, thus - dropping all SXID_ERASE tunables and any invalid or - unrecognized tunables. */ - if (__libc_enable_secure) - { - if (cur->security_level != TUNABLE_SECLEVEL_SXID_ERASE) - { - if (off > 0) - tunestr[off++] = ':'; - - const char *n = cur->name; - - while (*n != '\0') - tunestr[off++] = *n++; - - tunestr[off++] = '='; - - for (size_t j = 0; j < len; j++) - tunestr[off++] = value[j]; - } - - if (cur->security_level != TUNABLE_SECLEVEL_NONE) - break; - } - - value[len] = '\0'; tunable_initialize (cur, value); break; } } - - /* We reached the end while processing the tunable string. */ - if (p[len] == '\0') - break; - - p += len + 1; } - - /* Terminate tunestr before we leave. */ - if (__libc_enable_secure) - tunestr[off] = '\0'; } /* Initialize the tunables list from the environment. For now we only use the @@ -263,16 +225,16 @@ __tunables_init (char **envp) size_t len = 0; char **prev_envp = envp; + /* Ignore tunables for AT_SECURE programs. */ + if (__libc_enable_secure) + return; + while ((envp = get_next_env (envp, &envname, &len, &envval, &prev_envp)) != NULL) { if (tunable_is_name ("GLIBC_TUNABLES", envname)) { - char *new_env = tunables_strdup (envname); - if (new_env != NULL) - parse_tunables (new_env + len + 1, envval); - /* Put in the updated envval. */ - *prev_envp = new_env; + parse_tunables (tunables_strdup (envval)); continue; } @@ -290,39 +252,6 @@ __tunables_init (char **envp) /* We have a match. Initialize and move on to the next line. */ if (tunable_is_name (name, envname)) { - /* For AT_SECURE binaries, we need to check the security settings of - the tunable and decide whether we read the value and also whether - we erase the value so that child processes don't inherit them in - the environment. */ - if (__libc_enable_secure) - { - if (cur->security_level == TUNABLE_SECLEVEL_SXID_ERASE) - { - /* Erase the environment variable. */ - char **ep = prev_envp; - - while (*ep != NULL) - { - if (tunable_is_name (name, *ep)) - { - char **dp = ep; - - do - dp[0] = dp[1]; - while (*dp++); - } - else - ++ep; - } - /* Reset the iterator so that we read the environment again - from the point we erased. */ - envp = prev_envp; - } - - if (cur->security_level != TUNABLE_SECLEVEL_NONE) - continue; - } - tunable_initialize (cur, envval); break; } diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list index 695ba7192e..fe26c76e1a 100644 --- a/elf/dl-tunables.list +++ b/elf/dl-tunables.list @@ -21,14 +21,6 @@ # minval: Optional minimum acceptable value # maxval: Optional maximum acceptable value # env_alias: An alias environment variable -# security_level: Specify security level of the tunable for AT_SECURE binaries. -# Valid values are: -# -# SXID_ERASE: (default) Do not read and do not pass on to -# child processes. -# SXID_IGNORE: Do not read, but retain for non-AT_SECURE -# subprocesses. -# NONE: Read all the time. glibc { malloc { @@ -41,7 +33,6 @@ glibc { top_pad { type: SIZE_T env_alias: MALLOC_TOP_PAD_ - security_level: SXID_IGNORE default: 131072 } perturb { @@ -49,35 +40,29 @@ glibc { minval: 0 maxval: 0xff env_alias: MALLOC_PERTURB_ - security_level: SXID_IGNORE } mmap_threshold { type: SIZE_T env_alias: MALLOC_MMAP_THRESHOLD_ - security_level: SXID_IGNORE } trim_threshold { type: SIZE_T env_alias: MALLOC_TRIM_THRESHOLD_ - security_level: SXID_IGNORE } mmap_max { type: INT_32 env_alias: MALLOC_MMAP_MAX_ - security_level: SXID_IGNORE minval: 0 } arena_max { type: SIZE_T env_alias: MALLOC_ARENA_MAX minval: 1 - security_level: SXID_IGNORE } arena_test { type: SIZE_T env_alias: MALLOC_ARENA_TEST minval: 1 - security_level: SXID_IGNORE } tcache_max { type: SIZE_T @@ -91,7 +76,6 @@ glibc { mxfast { type: SIZE_T minval: 0 - security_level: SXID_IGNORE } hugetlb { type: SIZE_T @@ -158,7 +142,6 @@ glibc { type: INT_32 minval: 0 maxval: 255 - security_level: SXID_IGNORE } } diff --git a/elf/tst-env-setuid-tunables.c b/elf/tst-env-setuid-tunables.c index 2603007b7b..ca02dbba58 100644 --- a/elf/tst-env-setuid-tunables.c +++ b/elf/tst-env-setuid-tunables.c @@ -15,14 +15,10 @@ License along with the GNU C Library; if not, see . */ -/* Verify that tunables correctly filter out unsafe tunables like - glibc.malloc.check and glibc.malloc.mmap_threshold but also retain - glibc.malloc.mmap_threshold in an unprivileged child. */ - -#define _LIBC 1 -#include "config.h" -#undef _LIBC +/* Verify that GLIBC_TUNABLES is kept unchanged but no tunable is actually + enabled for AT_SECURE processes. */ +#include #include #include #include @@ -40,7 +36,7 @@ #include #include -const char *teststrings[] = +static const char *teststrings[] = { "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096", "glibc.malloc.check=2:glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096", @@ -74,6 +70,23 @@ test_child (int off) ret = 0; fflush (stdout); + /* Also check if the set tunables are effectively unchanged. */ + int32_t check = TUNABLE_GET_FULL (glibc, malloc, check, int32_t, NULL); + size_t mmap_threshold = TUNABLE_GET_FULL (glibc, malloc, mmap_threshold, + size_t, NULL); + int32_t perturb = TUNABLE_GET_FULL (glibc, malloc, perturb, int32_t, NULL); + + printf (" [%d] glibc.malloc.check=%d\n", off, check); + fflush (stdout); + printf (" [%d] glibc.malloc.mmap_threshold=%zu\n", off, mmap_threshold); + fflush (stdout); + printf (" [%d] glibc.malloc.perturb=%d\n", off, perturb); + fflush (stdout); + + ret |= check != 0; + ret |= mmap_threshold != 0; + ret |= perturb != 0; + return ret; } diff --git a/elf/tst-tunables.c b/elf/tst-tunables.c new file mode 100644 index 0000000000..d874b73b68 --- /dev/null +++ b/elf/tst-tunables.c @@ -0,0 +1,244 @@ +/* Check GLIBC_TUNABLES parsing. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include +#include +#include + +static int restart; +#define CMDLINE_OPTIONS \ + { "restart", no_argument, &restart, 1 }, + +static const struct test_t +{ + const char *env; + int32_t expected_malloc_check; + size_t expected_mmap_threshold; + int32_t expected_perturb; +} tests[] = +{ + /* Expected tunable format. */ + { + "glibc.malloc.check=2", + 2, + 0, + 0, + }, + { + "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096", + 2, + 4096, + 0, + }, + /* Empty tunable are ignored. */ + { + "glibc.malloc.check=2::glibc.malloc.mmap_threshold=4096", + 2, + 4096, + 0, + }, + /* As well empty values. */ + { + "glibc.malloc.check=:glibc.malloc.mmap_threshold=4096", + 0, + 4096, + 0, + }, + /* Tunable are processed from left to right, so last one is the one set. */ + { + "glibc.malloc.check=1:glibc.malloc.check=2", + 2, + 0, + 0, + }, + { + "glibc.malloc.check=1:glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096", + 2, + 4096, + 0, + }, + { + "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096:glibc.malloc.check=1", + 1, + 4096, + 0, + }, + /* 0x800 is larger than tunable maxval (0xff), so the tunable is unchanged. */ + { + "glibc.malloc.perturb=0x800", + 0, + 0, + 0, + }, + { + "glibc.malloc.perturb=0x55", + 0, + 0, + 0x55, + }, + /* Out of range values are just ignored. */ + { + "glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096", + 0, + 4096, + 0, + }, + /* Invalid keys are ignored. */ + { + ":glibc.malloc.garbage=2:glibc.malloc.check=1", + 1, + 0, + 0, + }, + { + "glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096", + 0, + 4096, + 0, + }, + { + "glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096", + 0, + 4096, + 0, + }, + { + "not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096", + 0, + 4096, + 0, + }, + /* Invalid subkeys are ignored. */ + { + "glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2", + 2, + 0, + 0, + }, + { + "glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096", + 0, + 0, + 0, + }, + { + "not_valid.malloc.check=2", + 0, + 0, + 0, + }, + { + "glibc.not_valid.check=2", + 0, + 0, + 0, + }, + /* An ill-formatted tunable in the for key=key=value will considere the + value as 'key=value' (which can not be parsed as an integer). */ + { + "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096", + 0, + 0, + 0, + }, + /* The ill-formatted tunable is also skipped. */ + { + "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2", + 2, + 0, + 0, + }, + /* For an integer tunable, parse will stop on non number character. */ + { + "glibc.malloc.check=2=2", + 2, + 0, + 0, + }, + { + "glibc.malloc.check=2=2:glibc.malloc.mmap_threshold=4096", + 2, + 4096, + 0, + } +}; + +static int +handle_restart (int i) +{ + TEST_COMPARE (tests[i].expected_malloc_check, + TUNABLE_GET_FULL (glibc, malloc, check, int32_t, NULL)); + TEST_COMPARE (tests[i].expected_mmap_threshold, + TUNABLE_GET_FULL (glibc, malloc, mmap_threshold, size_t, NULL)); + TEST_COMPARE (tests[i].expected_perturb, + TUNABLE_GET_FULL (glibc, malloc, perturb, int32_t, NULL)); + return 0; +} + +static int +do_test (int argc, char *argv[]) +{ + /* We must have either: + - One our fource parameters left if called initially: + + path to ld.so optional + + "--library-path" optional + + the library path optional + + the application name + + the test to check */ + + TEST_VERIFY_EXIT (argc == 2 || argc == 5); + + if (restart) + return handle_restart (atoi (argv[1])); + + char nteststr[INT_BUFSIZE_BOUND (int)]; + + char *spargv[10]; + { + int i = 0; + for (; i < argc - 1; i++) + spargv[i] = argv[i + 1]; + spargv[i++] = (char *) "--direct"; + spargv[i++] = (char *) "--restart"; + spargv[i++] = nteststr; + spargv[i] = NULL; + } + + for (int i = 0; i < array_length (tests); i++) + { + snprintf (nteststr, sizeof nteststr, "%d", i); + + printf ("[%d] Spawned test for %s\n", i, tests[i].env); + setenv ("GLIBC_TUNABLES", tests[i].env, 1); + struct support_capture_subprocess result + = support_capture_subprogram (spargv[0], spargv); + support_capture_subprocess_check (&result, "tst-tunables", 0, + sc_allow_stderr); + support_capture_subprocess_free (&result); + } + + return 0; +} + +#define TEST_FUNCTION_ARGV do_test +#include diff --git a/manual/README.tunables b/manual/README.tunables index 605ddd78cd..72ae00dc02 100644 --- a/manual/README.tunables +++ b/manual/README.tunables @@ -59,15 +59,6 @@ The list of allowed attributes are: - env_alias: An alias environment variable -- security_level: Specify security level of the tunable for AT_SECURE - binaries. Valid values are: - - SXID_ERASE: (default) Do not read and do not pass on to - child processes. - SXID_IGNORE: Do not read, but retain for non-AT_SECURE - child processes. - NONE: Read all the time. - 2. Use TUNABLE_GET/TUNABLE_SET/TUNABLE_SET_WITH_BOUNDS to get and set tunables. 3. OPTIONAL: If tunables in a namespace are being used multiple times within a diff --git a/scripts/gen-tunables.awk b/scripts/gen-tunables.awk index d6de100df0..1e9d6b534e 100644 --- a/scripts/gen-tunables.awk +++ b/scripts/gen-tunables.awk @@ -61,9 +61,6 @@ $1 == "}" { if (!env_alias[top_ns,ns,tunable]) { env_alias[top_ns,ns,tunable] = "{0}" } - if (!security_level[top_ns,ns,tunable]) { - security_level[top_ns,ns,tunable] = "SXID_ERASE" - } len = length(top_ns"."ns"."tunable) if (len > max_name_len) max_name_len = len @@ -118,17 +115,6 @@ $1 == "}" { if (len > max_alias_len) max_alias_len = len } - else if (attr == "security_level") { - if (val == "SXID_ERASE" || val == "SXID_IGNORE" || val == "NONE") { - security_level[top_ns,ns,tunable] = val - } - else { - printf("Line %d: Invalid value (%s) for security_level: %s, ", NR, val, - $0) - print("Allowed values are 'SXID_ERASE', 'SXID_IGNORE', or 'NONE'") - exit 1 - } - } else if (attr == "default") { if (types[top_ns,ns,tunable] == "STRING") { default_val[top_ns,ns,tunable] = sprintf(".strval = \"%s\"", val); @@ -177,9 +163,9 @@ END { n = indices[2]; m = indices[3]; printf (" {TUNABLE_NAME_S(%s, %s, %s)", t, n, m) - printf (", {TUNABLE_TYPE_%s, %s, %s}, {%s}, false, TUNABLE_SECLEVEL_%s, %s},\n", + printf (", {TUNABLE_TYPE_%s, %s, %s}, {%s}, false, %s},\n", types[t,n,m], minvals[t,n,m], maxvals[t,n,m], - default_val[t,n,m], security_level[t,n,m], env_alias[t,n,m]); + default_val[t,n,m], env_alias[t,n,m]); } print "};" print "#endif" diff --git a/sysdeps/x86_64/64/dl-tunables.list b/sysdeps/x86_64/64/dl-tunables.list index 0aab52e662..54a216a461 100644 --- a/sysdeps/x86_64/64/dl-tunables.list +++ b/sysdeps/x86_64/64/dl-tunables.list @@ -23,7 +23,6 @@ glibc { minval: 0 maxval: 1 env_alias: LD_PREFER_MAP_32BIT_EXEC - security_level: SXID_IGNORE } } } From patchwork Mon Nov 6 20:25:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79230 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 6B3303857704 for ; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:05 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Cc: DJ Delorie Subject: [PATCH v3 04/19] elf: Add all malloc tunable to unsecvars Date: Mon, 6 Nov 2023 17:25:37 -0300 Message-Id: <20231106202552.3404059-5-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-13.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Some environment variables allow alteration of allocator behavior across setuid boundaries, where a setuid program may ignore the tunable, but its non-setuid child can read it and adjust the memory allocator behavior accordingly. Most library behavior tunings is limited to the current process and does not bleed in scope; so it is unclear how pratical this misfeature is. If behavior change across privilege boundaries is desirable, it would be better done with a wrapper program around the non-setuid child that sets these envvars, instead of using the setuid process as the messenger. The patch as fixes tst-env-setuid, where it fail if any unsecvars is set. It also adds a dynamic test, although it requires --enable-hardcoded-path-in-tests so kernel correctly sets the setuid bit (using the loader command directly would require to set the setuid bit on the loader itself, which is not a usual deployment). Co-authored-by: Siddhesh Poyarekar Checked on x86_64-linux-gnu. Reviewed-by: DJ Delorie --- elf/Makefile | 8 +-- elf/tst-env-setuid-static.c | 1 + elf/tst-env-setuid.c | 128 +++++++++++++++++++++--------------- sysdeps/generic/unsecvars.h | 7 ++ 4 files changed, 86 insertions(+), 58 deletions(-) create mode 100644 elf/tst-env-setuid-static.c diff --git a/elf/Makefile b/elf/Makefile index 5f24a00a92..52981c19d0 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -262,7 +262,7 @@ tests-static-normal := \ tst-array5-static \ tst-dl-iter-static \ tst-dst-static \ - tst-env-setuid \ + tst-env-setuid-static \ tst-getauxval-static \ tst-linkall-static \ tst-single_threaded-pthread-static \ @@ -305,6 +305,7 @@ tests := \ tst-array5 \ tst-auxv \ tst-dl-hash \ + tst-env-setuid \ tst-leaks1 \ tst-stringtable \ tst-tls9 \ @@ -2429,9 +2430,6 @@ $(objpfx)tst-nodelete-dlclose: $(objpfx)tst-nodelete-dlclose-dso.so $(objpfx)tst-nodelete-dlclose.out: $(objpfx)tst-nodelete-dlclose-dso.so \ $(objpfx)tst-nodelete-dlclose-plugin.so -tst-env-setuid-ENV = MALLOC_CHECK_=2 MALLOC_MMAP_THRESHOLD_=4096 \ - LD_HWCAP_MASK=0x1 - $(objpfx)tst-debug1.out: $(objpfx)tst-debug1mod1.so $(objpfx)tst-debug1mod1.so: $(objpfx)testobj1.so @@ -2983,3 +2981,5 @@ LDFLAGS-tst-dlclose-lazy-mod1.so = -Wl,-z,lazy,--no-as-needed $(objpfx)tst-dlclose-lazy-mod1.so: $(objpfx)tst-dlclose-lazy-mod2.so $(objpfx)tst-dlclose-lazy.out: \ $(objpfx)tst-dlclose-lazy-mod1.so $(objpfx)tst-dlclose-lazy-mod2.so + +tst-env-setuid-ARGS = -- $(host-test-program-cmd) diff --git a/elf/tst-env-setuid-static.c b/elf/tst-env-setuid-static.c new file mode 100644 index 0000000000..0d88ae88b9 --- /dev/null +++ b/elf/tst-env-setuid-static.c @@ -0,0 +1 @@ +#include "tst-env-setuid.c" diff --git a/elf/tst-env-setuid.c b/elf/tst-env-setuid.c index 032ab44be2..ba295a6a14 100644 --- a/elf/tst-env-setuid.c +++ b/elf/tst-env-setuid.c @@ -15,18 +15,14 @@ License along with the GNU C Library; if not, see . */ -/* Verify that tunables correctly filter out unsafe environment variables like - MALLOC_CHECK_ and MALLOC_MMAP_THRESHOLD_ but also retain - MALLOC_MMAP_THRESHOLD_ in an unprivileged child. */ +/* Verify that correctly filter out unsafe environment variables defined + in unsecvars.h. */ -#include -#include -#include -#include +#include +#include #include +#include #include -#include -#include #include #include @@ -36,61 +32,72 @@ static char SETGID_CHILD[] = "setgid-child"; -#ifndef test_child -static int -test_child (void) -{ - if (getenv ("MALLOC_CHECK_") != NULL) - { - printf ("MALLOC_CHECK_ is still set\n"); - return 1; - } - - if (getenv ("MALLOC_MMAP_THRESHOLD_") == NULL) - { - printf ("MALLOC_MMAP_THRESHOLD_ lost\n"); - return 1; - } +#define FILTERED_VALUE "some-filtered-value" +#define UNFILTERED_VALUE "some-unfiltered-value" - if (getenv ("LD_HWCAP_MASK") != NULL) - { - printf ("LD_HWCAP_MASK still set\n"); - return 1; - } +struct envvar_t +{ + const char *env; + const char *value; +}; - return 0; -} -#endif +/* That is not an extensible list of all filtered out environment + variables. */ +static const struct envvar_t filtered_envvars[] = +{ + { "GLIBC_TUNABLES", FILTERED_VALUE }, + { "LD_AUDIT", FILTERED_VALUE }, + { "LD_HWCAP_MASK", FILTERED_VALUE }, + { "LD_LIBRARY_PATH", FILTERED_VALUE }, + { "LD_PRELOAD", FILTERED_VALUE }, + { "LD_PROFILE", FILTERED_VALUE }, + { "MALLOC_ARENA_MAX", FILTERED_VALUE }, + { "MALLOC_PERTURB_", FILTERED_VALUE }, + { "MALLOC_TRACE", FILTERED_VALUE }, + { "MALLOC_TRIM_THRESHOLD_", FILTERED_VALUE }, + { "RES_OPTIONS", FILTERED_VALUE }, +}; + +static const struct envvar_t unfiltered_envvars[] = +{ + { "LD_BIND_NOW", "0" }, + { "LD_BIND_NOT", "1" }, + /* Non longer supported option. */ + { "LD_ASSUME_KERNEL", UNFILTERED_VALUE }, +}; -#ifndef test_parent static int -test_parent (void) +test_child (void) { - if (getenv ("MALLOC_CHECK_") == NULL) - { - printf ("MALLOC_CHECK_ lost\n"); - return 1; - } + int ret = 0; - if (getenv ("MALLOC_MMAP_THRESHOLD_") == NULL) + for (const struct envvar_t *e = filtered_envvars; + e != array_end (filtered_envvars); + e++) { - printf ("MALLOC_MMAP_THRESHOLD_ lost\n"); - return 1; + const char *env = getenv (e->env); + ret |= env != NULL; } - if (getenv ("LD_HWCAP_MASK") == NULL) + for (const struct envvar_t *e = unfiltered_envvars; + e != array_end (unfiltered_envvars); + e++) { - printf ("LD_HWCAP_MASK lost\n"); - return 1; + const char *env = getenv (e->env); + ret |= !(env != NULL && strcmp (env, e->value) == 0); } - return 0; + return ret; } -#endif static int do_test (int argc, char **argv) { + /* For dynamic loader, the test requires --enable-hardcoded-path-in-tests so + the kernel sets the AT_SECURE on process initialization. */ + if (argc >= 2 && strstr (argv[1], LD_SO) != 0) + FAIL_UNSUPPORTED ("dynamic test requires --enable-hardcoded-path-in-tests"); + /* Setgid child process. */ if (argc == 2 && strcmp (argv[1], SETGID_CHILD) == 0) { @@ -104,20 +111,33 @@ do_test (int argc, char **argv) if (ret != 0) exit (1); - exit (EXIT_SUCCESS); + /* Special return code to make sure that the child executed all the way + through. */ + exit (42); } else { - if (test_parent () != 0) - exit (1); + for (const struct envvar_t *e = filtered_envvars; + e != array_end (filtered_envvars); + e++) + setenv (e->env, e->value, 1); + + for (const struct envvar_t *e = unfiltered_envvars; + e != array_end (unfiltered_envvars); + e++) + setenv (e->env, e->value, 1); int status = support_capture_subprogram_self_sgid (SETGID_CHILD); if (WEXITSTATUS (status) == EXIT_UNSUPPORTED) - return EXIT_UNSUPPORTED; - - if (!WIFEXITED (status)) - FAIL_EXIT1 ("Unexpected exit status %d from child process\n", status); + exit (EXIT_UNSUPPORTED); + + if (WEXITSTATUS (status) != 42) + { + printf (" child failed with status %d\n", + WEXITSTATUS (status)); + support_record_failure (); + } return 0; } diff --git a/sysdeps/generic/unsecvars.h b/sysdeps/generic/unsecvars.h index 81397fb90b..f7ebed60e5 100644 --- a/sysdeps/generic/unsecvars.h +++ b/sysdeps/generic/unsecvars.h @@ -18,7 +18,14 @@ "LD_SHOW_AUXV\0" \ "LOCALDOMAIN\0" \ "LOCPATH\0" \ + "MALLOC_ARENA_MAX\0" \ + "MALLOC_ARENA_TEST\0" \ + "MALLOC_MMAP_MAX_\0" \ + "MALLOC_MMAP_THRESHOLD_\0" \ + "MALLOC_PERTURB_\0" \ + "MALLOC_TOP_PAD_\0" \ "MALLOC_TRACE\0" \ + "MALLOC_TRIM_THRESHOLD_\0" \ "NIS_PATH\0" \ "NLSPATH\0" \ "RESOLV_HOST_CONF\0" \ From patchwork Mon Nov 6 20:25:38 2023 Content-Type: text/plain; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:07 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 05/19] elf: Do not process invalid tunable format Date: Mon, 6 Nov 2023 17:25:38 -0300 Message-Id: <20231106202552.3404059-6-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Tunable definitions with more than one '=' on are parsed and enabled, and any subsequent '=' are ignored. It means that tunables in the form 'tunable=tunable=value' or 'tunable=value=value' are handled as 'tunable=value'. These inputs are likely user input errors, which should not be accepted. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/dl-tunables.c | 6 ++++-- elf/tst-tunables.c | 22 +++++++++++++++++----- 2 files changed, 21 insertions(+), 7 deletions(-) diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index f7dca8f7c1..082a76d9c4 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -192,10 +192,12 @@ parse_tunables (char *valstring) const char *value = p; - while (*p != ':' && *p != '\0') + while (*p != '=' && *p != ':' && *p != '\0') p++; - if (*p == '\0') + if (*p == '=') + break; + else if (*p == '\0') done = true; else *p++ = '\0'; diff --git a/elf/tst-tunables.c b/elf/tst-tunables.c index d874b73b68..7fe9907e05 100644 --- a/elf/tst-tunables.c +++ b/elf/tst-tunables.c @@ -161,24 +161,36 @@ static const struct test_t 0, 0, }, - /* The ill-formatted tunable is also skipped. */ + /* If there is a ill-formatted key=value, everything after is also ignored. */ { "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2", - 2, + 0, 0, 0, }, - /* For an integer tunable, parse will stop on non number character. */ { "glibc.malloc.check=2=2", - 2, + 0, 0, 0, }, { "glibc.malloc.check=2=2:glibc.malloc.mmap_threshold=4096", + 0, + 0, + 0, + }, + { + "glibc.malloc.check=2=2:glibc.malloc.check=2", + 0, + 0, + 0, + }, + /* Valid tunables set before ill-formatted ones are set. */ + { + "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096", 2, - 4096, + 0, 0, } }; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:09 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 06/19] elf: Do not parse ill-formatted strings Date: Mon, 6 Nov 2023 17:25:39 -0300 Message-Id: <20231106202552.3404059-7-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Instead of ignoring ill-formatted tunable strings, first, check all the tunable definitions are correct and then set each tunable value. It means that partially invalid strings, like "key1=value1:key2=key2=value' or 'key1=value':key2=value2=value2' do not enable 'key1=value1'. It avoids possible user-defined errors in tunable definitions. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/dl-tunables.c | 48 ++++++++++++++++++++++++++++++++++------------ elf/tst-tunables.c | 13 +++++++++---- 2 files changed, 45 insertions(+), 16 deletions(-) diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index 082a76d9c4..e1198869d6 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -154,17 +154,29 @@ __tunable_set_val (tunable_id_t id, tunable_val_t *valp, tunable_num_t *minp, do_tunable_update_val (cur, valp, minp, maxp); } -/* Parse the tunable string VALSTRING. VALSTRING is a duplicated value, - where delimiters ':' are replaced with '\0', so string tunables are null - terminated. */ -static void -parse_tunables (char *valstring) +struct tunable_toset_t +{ + tunable_t *t; + const char *value; +}; + +enum { tunables_list_size = array_length (tunable_list) }; + +/* Parse the tunable string VALSTRING and set TUNABLES with the found tunables + and their respectibles values. VALSTRING is a duplicated values, where + delimiters ':' are replaced with '\0', so string tunables are null + terminated. + Return the number of tunables found (including 0 if the string is empty) + or -1 if for a ill-formatted definition. */ +static int +parse_tunables_string (char *valstring, struct tunable_toset_t *tunables) { if (valstring == NULL || *valstring == '\0') - return; + return 0; char *p = valstring; bool done = false; + int ntunables = 0; while (!done) { @@ -177,7 +189,7 @@ parse_tunables (char *valstring) /* If we reach the end of the string before getting a valid name-value pair, bail out. */ if (*p == '\0') - break; + return -1; /* We did not find a valid name-value pair before encountering the colon. */ @@ -190,30 +202,42 @@ parse_tunables (char *valstring) /* Skip the '='. */ p++; - const char *value = p; + char *value = p; while (*p != '=' && *p != ':' && *p != '\0') p++; if (*p == '=') - break; + return -1; else if (*p == '\0') done = true; else *p++ = '\0'; /* Add the tunable if it exists. */ - for (size_t i = 0; i < sizeof (tunable_list) / sizeof (tunable_t); i++) + for (size_t i = 0; i < tunables_list_size; i++) { tunable_t *cur = &tunable_list[i]; if (tunable_is_name (cur->name, name)) { - tunable_initialize (cur, value); + tunables[ntunables++] = (struct tunable_toset_t) { cur, value }; break; } } } + + return ntunables; +} + +static void +parse_tunables (char *valstring) +{ + struct tunable_toset_t tunables[tunables_list_size]; + int ntunables = parse_tunables_string (valstring, tunables); + + for (int i = 0; i < ntunables; i++) + tunable_initialize (tunables[i].t, tunables[i].value); } /* Initialize the tunables list from the environment. For now we only use the @@ -240,7 +264,7 @@ __tunables_init (char **envp) continue; } - for (int i = 0; i < sizeof (tunable_list) / sizeof (tunable_t); i++) + for (int i = 0; i < tunables_list_size; i++) { tunable_t *cur = &tunable_list[i]; diff --git a/elf/tst-tunables.c b/elf/tst-tunables.c index 7fe9907e05..e1ad44f27c 100644 --- a/elf/tst-tunables.c +++ b/elf/tst-tunables.c @@ -161,7 +161,7 @@ static const struct test_t 0, 0, }, - /* If there is a ill-formatted key=value, everything after is also ignored. */ + /* Ill-formatted tunables string is not parsed. */ { "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2", 0, @@ -186,13 +186,18 @@ static const struct test_t 0, 0, }, - /* Valid tunables set before ill-formatted ones are set. */ { "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096", - 2, 0, 0, - } + 0, + }, + { + "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096", + 0, + 0, + 0, + }, }; static int From patchwork Mon Nov 6 20:25:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79233 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 3F222385C6DE for ; Mon, 6 Nov 2023 20:27:00 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x1136.google.com (mail-yw1-x1136.google.com [IPv6:2607:f8b0:4864:20::1136]) by sourceware.org (Postfix) with ESMTPS id 04AA43857342 for ; Mon, 6 Nov 2023 20:26:13 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 04AA43857342 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 04AA43857342 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::1136 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302374; cv=none; b=txRwh+C17Ootd+XicXh9sOyFicz86I9fTOY7mNLr9b9P+Vx447GzFTfpJvpArprWMT6f/Aa957h26iSmQ3qLPXDGB3nQq6RXyXe1pRps2fBdHltoDgqIIXrXOJcd7AgfVMhhEagWHa2E3sINWTISfzSzE+LPmyHwG7TqRjP/agY= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302374; c=relaxed/simple; bh=GHAHXQGW8DqZSnhM9/SOgbbbUHiQk3AC8tGx9TXTpFg=; h=DKIM-Signature:From:To:Subject:Date:Message-Id:MIME-Version; b=GvGP2QCgbf+pPtJtrffXHPn5OmcdfR9jnGcR83NTRJBrqv7zHj6+UGn+tYQ1ZfRAY5Gqbeeih+jNFluO086NQHqvRVLblMEE1Y3CI9ocB5t7I81kysaASB6fOw/eubJ7l4oFlLpXUIRuRYuyM9dz7cOXSu2NvBX3ilJ0BLd0Wh0= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yw1-x1136.google.com with SMTP id 00721157ae682-5a7af52ee31so57797167b3.2 for ; Mon, 06 Nov 2023 12:26:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699302372; x=1699907172; darn=sourceware.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=m3Ws7f5PM27Oh7b/DP8x28r02VFmx16EapZknjfk7a8=; b=Pt1/aa/LgRnDEMKwJw/D7owkl1P/9NGQoVZfil9hvVlpL/ZkitSB2B1bplFEtF/d0v hht32IAtaGNpnRnrpWXfZCZsaT/MjXi5uF+vi+b5qd/uJd0iWV39bygUqg2FvDrMzNUt Pl/E2Ud/lcrj5R1+eok59NJNlpGzc/IJ0jZjifqOJky4X/vbZiWt2gnbsjI7+z+RCFcl XfCwiMh97yYNM4GMNTCu/J8Fi/tLYBqAOzOBdbpWpec8Og9hyMnJBbWRTz9jzU6jCiGg yIRCZTdxXyYmOLm946W98LhH/3sgVHDQKlXtL/YUtQ8ZU/Dg8gOxC8FEm/8SWauAONQZ 4oCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699302372; x=1699907172; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=m3Ws7f5PM27Oh7b/DP8x28r02VFmx16EapZknjfk7a8=; b=T4STwmFF1v+kWGwEQUlq8Dux+IlvrMmdk+W+/MjB2RhU8eJcC1eSh43eVtT062sa8/ BQI/ujq6RUT41Dddijlu10TaGA2G0ObarkGYtvapcZYLjpbJn1YJgwr59PE+nxero5HF INIp2KciTLeVe26QcVzp9cGNC1jxiHDbUMXpxOk1IP1q0ZRdTDKDFL/O7OGJcOyQFVKp VKXfe6slXhz8STlh8Y+dfSxTblC5+TSgzC9Rq55yRKtx9TH1r9SASrX+GOJhC+Y8wsKt UsaqXvIz2/1luT3BGk2W1d2doRlyakTo5l0ewWGPTKIWFUg/XkHnvU9a6/2OQi/7zMJf 7YlA== X-Gm-Message-State: AOJu0Yy6K2PJtBG9fjguAgmjaEA1KbX+G/7NgKc2TrzMRsRSajxONTtZ x2ggGi80pLdsYFqLzgcd7A6n1/TJf56xnqPdT6dR0Q== X-Google-Smtp-Source: AGHT+IHTaa0t5uco48lQUgP7CgEIKvBI+xADsxXRgGqJyj4L0PmTKCRABczGo+26TA7T3RusERSGPQ== X-Received: by 2002:a81:570c:0:b0:5a7:b942:c3fe with SMTP id l12-20020a81570c000000b005a7b942c3femr11015788ywb.16.1699302371890; Mon, 06 Nov 2023 12:26:11 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:11 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 07/19] elf: Fix _dl_debug_vdprintf to work before self-relocation Date: Mon, 6 Nov 2023 17:25:40 -0300 Message-Id: <20231106202552.3404059-8-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org The strlen might trigger and invalid GOT entry if it used before the process is self-relocated (for instance on dl-tunables if any error occurs). For i386, _dl_writev with PIE requires to use the old 'int $0x80' syscall mode because the calling the TLS register (gs) is not yet initialized. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/dl-printf.c | 16 ++++++++++++++-- stdio-common/Makefile | 5 +++++ stdio-common/_itoa.c | 5 +++++ sysdeps/unix/sysv/linux/i386/dl-writev.h | 24 ++++++++++++++++++++++++ 4 files changed, 48 insertions(+), 2 deletions(-) create mode 100644 sysdeps/unix/sysv/linux/i386/dl-writev.h diff --git a/elf/dl-printf.c b/elf/dl-printf.c index 6efb4c019a..5e93208535 100644 --- a/elf/dl-printf.c +++ b/elf/dl-printf.c @@ -17,6 +17,10 @@ License along with the GNU C Library; if not, see . */ +#include +#if BUILD_PIE_DEFAULT +# pragma GCC visibility push(hidden) +#endif #include <_itoa.h> #include #include @@ -25,11 +29,19 @@ #include #include #include -#include #include #include #include +/* The function might be called before the process is self-relocated. */ +static size_t +_dl_debug_strlen (const char *s) +{ + const char *p = s; + for (; *s != '\0'; s++); + return s - p; +} + /* Bare-bones printf implementation. This function only knows about the formats and flags needed and can handle only up to 64 stripes in the output. */ @@ -193,7 +205,7 @@ _dl_debug_vdprintf (int fd, int tag_p, const char *fmt, va_list arg) case 's': /* Get the string argument. */ iov[niov].iov_base = va_arg (arg, char *); - iov[niov].iov_len = strlen (iov[niov].iov_base); + iov[niov].iov_len = _dl_debug_strlen (iov[niov].iov_base); if (prec != -1) iov[niov].iov_len = MIN ((size_t) prec, iov[niov].iov_len); ++niov; diff --git a/stdio-common/Makefile b/stdio-common/Makefile index bacb795fed..e88a9cea29 100644 --- a/stdio-common/Makefile +++ b/stdio-common/Makefile @@ -460,6 +460,11 @@ CFLAGS-isoc23_scanf.c += -fexceptions CFLAGS-dprintf.c += $(config-cflags-wno-ignored-attributes) +# Called during static library initialization, so turn stack-protection +# off for non-shared builds. +CFLAGS-_itoa.o = $(no-stack-protector) +CFLAGS-_itoa.op = $(no-stack-protector) + # scanf18.c and scanf19.c test a deprecated extension which is no # longer visible under most conformance levels; see the source files # for more detail. diff --git a/stdio-common/_itoa.c b/stdio-common/_itoa.c index 3037b0f529..48f2903ecb 100644 --- a/stdio-common/_itoa.c +++ b/stdio-common/_itoa.c @@ -16,6 +16,11 @@ License along with the GNU C Library; if not, see . */ +/* Mark symbols hidden in static PIE for early self relocation to work. + Note: string.h may have ifuncs which cannot be hidden on i686. */ +#if BUILD_PIE_DEFAULT +# pragma GCC visibility push(hidden) +#endif #include #include #include diff --git a/sysdeps/unix/sysv/linux/i386/dl-writev.h b/sysdeps/unix/sysv/linux/i386/dl-writev.h new file mode 100644 index 0000000000..624d0e46b0 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/dl-writev.h @@ -0,0 +1,24 @@ +/* Message-writing for the dynamic linker. Linux/i386 version. + Copyright (C) 2013-2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#if BUILD_PIE_DEFAULT +/* Can't use "call *%gs:SYSINFO_OFFSET" during startup in static PIE. */ +# define I386_USE_SYSENTER 0 +#endif + +#include From patchwork Mon Nov 6 20:25:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79234 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id E7CFB385B53E for ; Mon, 6 Nov 2023 20:27:03 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x1130.google.com (mail-yw1-x1130.google.com [IPv6:2607:f8b0:4864:20::1130]) by sourceware.org (Postfix) with ESMTPS id B5BF23857C44 for ; Mon, 6 Nov 2023 20:26:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org B5BF23857C44 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org ARC-Filter: OpenARC Filter v1.0.0 sourceware.org B5BF23857C44 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::1130 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302375; cv=none; b=KhamLaxqtSYQw6wcIhH/vsE6jrbWLqaqFN4fee8K5GWXhdlPgfzr6qydQxl72ZboXckOeCpsyzen0ffZke0sSWqN1j75cgBUMH2ouSXR1GO1rFL1gOuzQ5Uv2J0YfLu9eRZwYbUzjNh20rUufjMSlawXO52hyTXGMG7f4NY3b7g= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302375; c=relaxed/simple; bh=LZUW34HABl9qwCWxOoNJ/tGUGkaAS8+rvvBq1RrvHYc=; h=DKIM-Signature:From:To:Subject:Date:Message-Id:MIME-Version; b=FnE6MyGq2KAtx2Bx4qKmFBUQhnBaoUuI3kmIscmhj9k+3R9oczahpavGNf0hsHo89b1OjBFWDAZxaqJBkGSJple09QGwiVqRtnD+frYys00KGTgNtMBKH6Jg/q/x1iv7B2Q71K2UwFfe8auM8/jD+y6xNjWDIw92VQtOiVKpAfM= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yw1-x1130.google.com with SMTP id 00721157ae682-5af6c445e9eso58101537b3.0 for ; Mon, 06 Nov 2023 12:26:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699302373; x=1699907173; darn=sourceware.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=M+BOkgSs9Y+wUqYrihgJi+/5VHiKVPJu0y/LowNInKU=; b=BbX/GONLmTjFEVSoaxPpi986lG0FIyD2KJQb3pg4WWEffcUSBMOrQZbLUl1z9ZNefZ Li8xgiEgIZ4y937kJeJbtVptnpBn6dRV1s29yiVY9TfmtTHVWazEwDUURd4ZazXI59pw P+iEE6jguHuYJ1KZu+UtCz/rDYNraMQCF0Co/hUw6gRZWLp0Ee7c5MpndeY18CFu2Z9O rntYLcd/U8yL0TSrYafDWkAmZVbi8GkFnr/ltbLSQ9yybOo0y71C/1jSBhFBp4xQ5CKG 22WotGATDpPNTcHkRjGCkCPwmd6Tdnbw9HAP0DIDspFFwq7vVl5iRMYXevZp6mPJClkG Jqhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699302373; x=1699907173; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=M+BOkgSs9Y+wUqYrihgJi+/5VHiKVPJu0y/LowNInKU=; b=ne6gM6KPUEFJ/HXD8g2oDQ/YZ7shnV9CaW8tWp+jyUeZGHeu507WehzipomtAHqbYF 5TyVaSADbE9ZOI6t4Cvk3MQDsNBTGJwLyZvBmInsakKkm6HgXQtKFVbmJPfb5+28QhDn NidyuhzKLZ23i3uRSdHMARG1LChv1iQW6lALgEqq7rTMrjDIDKStruj4dwbedjZnF4u8 vrcbETMucljnilYYxaoD78eW0FtqYy5XEUqkUvAIbslHEgoJwE/VfkH20aMmUtNkj8PE MVFIQuXuTn5R1mM3tNlmqYp81Sm4mbHWq0kwcph2fusWIwN3Q6b97r6Cbb638/tOGjY9 S9Hg== X-Gm-Message-State: AOJu0YwmN07h2nSL0CiTyePZhL94Jbt8tiSXTK4Fz7IcJUEBeOzH1s49 X0oYjngPJn06NzAPH7vutK0MoHh+QIQCggHjToFHhQ== X-Google-Smtp-Source: AGHT+IEWSe/dSEl5mDHSO/ooctdMjqSmxGHsEuoyxUwH5exJXXzNAV/c7BWouafRgQFGIjR1YCbGog== X-Received: by 2002:a05:690c:c:b0:5b3:21cd:ba76 with SMTP id bc12-20020a05690c000c00b005b321cdba76mr12604544ywb.4.1699302373551; Mon, 06 Nov 2023 12:26:13 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:13 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 08/19] elf: Emit warning if tunable is ill-formatted Date: Mon, 6 Nov 2023 17:25:41 -0300 Message-Id: <20231106202552.3404059-9-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-13.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org So caller knows that the tunable will be ignored. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/dl-tunables.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index e1198869d6..6e3e6a2cf8 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -235,6 +235,12 @@ parse_tunables (char *valstring) { struct tunable_toset_t tunables[tunables_list_size]; int ntunables = parse_tunables_string (valstring, tunables); + if (ntunables == -1) + { + _dl_error_printf ( + "WARNING: ld.so: invalid GLIBC_TUNABLES `%s': ignored.\n", valstring); + return; + } for (int i = 0; i < ntunables; i++) tunable_initialize (tunables[i].t, tunables[i].value); From patchwork Mon Nov 6 20:25:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79238 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 98A393853D36 for ; Mon, 6 Nov 2023 20:27:36 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x112f.google.com (mail-yw1-x112f.google.com [IPv6:2607:f8b0:4864:20::112f]) by sourceware.org (Postfix) with ESMTPS id C6150385783F for ; Mon, 6 Nov 2023 20:26:16 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org C6150385783F Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org ARC-Filter: OpenARC Filter v1.0.0 sourceware.org C6150385783F Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::112f ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302379; cv=none; b=il8DQK9m5kk3DVQQ93LU8ZuLJpNRx2fKYSLietQiMk/ye7eEL7drvI+ibzAUG1iXt5Os+ykoGYI/ZLRURgCd5sr3ZMP1/ReiZk6zSXQjeJArO9O6qifLHGhSAbvQ7oxg1/QKGOgC+DOLVgRknY395RYp9C+p5xXTW+ahpJkUeFk= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302379; c=relaxed/simple; bh=sqh0rRH1d8vEuSpJWMlgry+ZPLL6nhduPLTCPhiW/EQ=; h=DKIM-Signature:From:To:Subject:Date:Message-Id:MIME-Version; b=fy5Q4/F2lxXFlZvbZTCXel2OzBS6MUWpnh5H0V4gBbbfRFG6nKBAXqP7tdp/msu3ZtVlfqVhbfPqWj9u4lrchlpMNayrYcKVEE+coU2g8meJ2OEU5T8bEo5JI1Kowv5xbS6wRcfrgwHFaPtUZJzTY8BT4Gtn23tvahta6WW2QqI= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yw1-x112f.google.com with SMTP id 00721157ae682-5b499b18b28so59299067b3.0 for ; Mon, 06 Nov 2023 12:26:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699302375; x=1699907175; darn=sourceware.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=mwKBe68nGz40YXHE5GIXD0G78lQPmNvQ11oO/WZQghs=; b=Wk9eoYnqPvKcTBDW5lLtTdMo047hk4fenUd1w1qyBEaxWooiUpfsvfXbbmx6DGfWNW mvLrMUrMw/Q7YojQ/pnNUrmmkYzNJdrMpbOoqzLdB9KZaXssuvWCP9qbvfRmUxCXnGQZ 2KK2vYfS1u1ljsui42lk57Uoc8zn1FP8BEJp/fQ4NKd/S/UKoK5KSDXxEtqz/M4uTr76 kfzNcHga8gY1KcY+ecUAm6rMEH0rjufu1qvRGZLHtAMfpW9VAA0M/ADjsXt0ASL2w27E C+DmY/CgpRzN+cPOoqmzylGDVBHCMEDZAMKY/mVgtlTUT+9kXTHGa47iGEcFtskSY3gP SmoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699302375; x=1699907175; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=mwKBe68nGz40YXHE5GIXD0G78lQPmNvQ11oO/WZQghs=; b=VZO9eUjN+Oamh3kqtwPBnZONH061QJb2Gif8Xs2xl//zgfXzyTXnMkuGxLFZmS6wLj cx04vBlp/opW2HzCezanF0LyRPV7KAa2FnsUpTs6etxvwFHjjdu0xRYMyBVuGuzcIH62 bBXvywfCEwORoUSoipZ7qPdi76fP0M4e+I4Lp7KMFxnIhcf1NzboWO134BkMP4Maeovp cGVvipBS2hAMMZaKMJbfvlX7hgPZJfl3wQNC0vVMVRck+TexQXGa53bca8zbknxdUiMv +gp5yjC2ELuHIsx623UasNT9FJZCgzy0YP6K+T9tiXs7bj5gCBm5us24ZKVyWUADCAD2 eYyg== X-Gm-Message-State: AOJu0Yzlj7tWx1GHzTvl0wxA6rSfhpQ6pIwp1+M+fohwU3W/GJ5v/dne opXzulgjwVtrgb5s9+xhop9dfia6XN0g06SZH7el5A== X-Google-Smtp-Source: AGHT+IEr3l/08+UDMYeq53qSQiFsHinLhRKNCxVUlpbsIMJ30MiHXTqTM0GZwZ3/yQmtn50T8FI9HQ== X-Received: by 2002:a0d:e681:0:b0:589:8b55:fe09 with SMTP id p123-20020a0de681000000b005898b55fe09mr10839511ywe.50.1699302375524; Mon, 06 Nov 2023 12:26:15 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:14 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Cc: Noah Goldstein Subject: [PATCH v3 09/19] x86: Use dl-symbol-redir-ifunc.h on cpu-tunables Date: Mon, 6 Nov 2023 17:25:42 -0300 Message-Id: <20231106202552.3404059-10-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-13.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org The dl-symbol-redir-ifunc.h redirects compiler-generated libcalls to arch-specific memory implementations to avoid ifunc calls where it is not yet possible. The memcmp-isa-default-impl.h aims to fix the same issue by calling the specific memset implementation directly. Using the memcmp symbol directly allows the compiler to inline the memset calls (especially because _dl_tunable_set_hwcaps uses constants values), generating better code. Checked on x86_64-linux-gnu. Reviewed-by: Noah Goldstein Reviewed-by: Siddhesh Poyarekar --- .../i686/multiarch/dl-symbol-redir-ifunc.h | 5 +++ sysdeps/x86/cpu-tunables.c | 39 ++++++------------- sysdeps/x86_64/memcmp-isa-default-impl.h | 28 ------------- .../x86_64/multiarch/dl-symbol-redir-ifunc.h | 15 +++++++ 4 files changed, 32 insertions(+), 55 deletions(-) delete mode 100644 sysdeps/x86_64/memcmp-isa-default-impl.h diff --git a/sysdeps/i386/i686/multiarch/dl-symbol-redir-ifunc.h b/sysdeps/i386/i686/multiarch/dl-symbol-redir-ifunc.h index dee69d19db..220c586bd2 100644 --- a/sysdeps/i386/i686/multiarch/dl-symbol-redir-ifunc.h +++ b/sysdeps/i386/i686/multiarch/dl-symbol-redir-ifunc.h @@ -19,6 +19,11 @@ #ifndef _DL_IFUNC_GENERIC_H #define _DL_IFUNC_GENERIC_H +#ifndef SHARED + asm ("memset = __memset_ia32"); +asm ("memcmp = __memcmp_ia32"); + +#endif /* SHARED */ #endif diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c index 0d4f328585..5697885226 100644 --- a/sysdeps/x86/cpu-tunables.c +++ b/sysdeps/x86/cpu-tunables.c @@ -24,24 +24,11 @@ #include #include #include - -/* We can't use IFUNC memcmp nor strlen in init_cpu_features from libc.a - since IFUNC must be set up by init_cpu_features. */ -#if defined USE_MULTIARCH && !defined SHARED -# ifdef __x86_64__ -/* DEFAULT_MEMCMP by sysdeps/x86_64/memcmp-isa-default-impl.h. */ -# include -# else -# define DEFAULT_MEMCMP __memcmp_ia32 -# endif -extern __typeof (memcmp) DEFAULT_MEMCMP; -#else -# define DEFAULT_MEMCMP memcmp -#endif +#include #define CHECK_GLIBC_IFUNC_CPU_OFF(f, cpu_features, name, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (!DEFAULT_MEMCMP (f, #name, len)) \ + if (memcmp (f, #name, len) == 0) \ { \ CPU_FEATURE_UNSET (cpu_features, name) \ break; \ @@ -51,7 +38,7 @@ extern __typeof (memcmp) DEFAULT_MEMCMP; which isn't available. */ #define CHECK_GLIBC_IFUNC_PREFERRED_OFF(f, cpu_features, name, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (!DEFAULT_MEMCMP (f, #name, len)) \ + if (memcmp (f, #name, len) == 0) \ { \ cpu_features->preferred[index_arch_##name] \ &= ~bit_arch_##name; \ @@ -62,7 +49,7 @@ extern __typeof (memcmp) DEFAULT_MEMCMP; #define CHECK_GLIBC_IFUNC_PREFERRED_BOTH(f, cpu_features, name, \ disable, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (!DEFAULT_MEMCMP (f, #name, len)) \ + if (memcmp (f, #name, len) == 0) \ { \ if (disable) \ cpu_features->preferred[index_arch_##name] &= ~bit_arch_##name; \ @@ -76,7 +63,7 @@ extern __typeof (memcmp) DEFAULT_MEMCMP; #define CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH(f, cpu_features, name, \ need, disable, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (!DEFAULT_MEMCMP (f, #name, len)) \ + if (memcmp (f, #name, len) == 0) \ { \ if (disable) \ cpu_features->preferred[index_arch_##name] &= ~bit_arch_##name; \ @@ -177,7 +164,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, POPCNT, 6); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSE4_1, 6); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSE4_2, 6); - if (!DEFAULT_MEMCMP (n, "XSAVEC", 6)) + if (memcmp (n, "XSAVEC", 6) == 0) { /* Update xsave_state_size to XSAVE state size. */ cpu_features->xsave_state_size @@ -290,12 +277,11 @@ attribute_hidden void TUNABLE_CALLBACK (set_x86_ibt) (tunable_val_t *valp) { - if (DEFAULT_MEMCMP (valp->strval, "on", sizeof ("on")) == 0) + if (memcmp (valp->strval, "on", sizeof ("on")) == 0) GL(dl_x86_feature_control).ibt = cet_always_on; - else if (DEFAULT_MEMCMP (valp->strval, "off", sizeof ("off")) == 0) + else if (memcmp (valp->strval, "off", sizeof ("off")) == 0) GL(dl_x86_feature_control).ibt = cet_always_off; - else if (DEFAULT_MEMCMP (valp->strval, "permissive", - sizeof ("permissive")) == 0) + else if (memcmp (valp->strval, "permissive", sizeof ("permissive")) == 0) GL(dl_x86_feature_control).ibt = cet_permissive; } @@ -303,12 +289,11 @@ attribute_hidden void TUNABLE_CALLBACK (set_x86_shstk) (tunable_val_t *valp) { - if (DEFAULT_MEMCMP (valp->strval, "on", sizeof ("on")) == 0) + if (memcmp (valp->strval, "on", sizeof ("on")) == 0) GL(dl_x86_feature_control).shstk = cet_always_on; - else if (DEFAULT_MEMCMP (valp->strval, "off", sizeof ("off")) == 0) + else if (memcmp (valp->strval, "off", sizeof ("off")) == 0) GL(dl_x86_feature_control).shstk = cet_always_off; - else if (DEFAULT_MEMCMP (valp->strval, "permissive", - sizeof ("permissive")) == 0) + else if (memcmp (valp->strval, "permissive", sizeof ("permissive")) == 0) GL(dl_x86_feature_control).shstk = cet_permissive; } #endif diff --git a/sysdeps/x86_64/memcmp-isa-default-impl.h b/sysdeps/x86_64/memcmp-isa-default-impl.h deleted file mode 100644 index 0962e83c3d..0000000000 --- a/sysdeps/x86_64/memcmp-isa-default-impl.h +++ /dev/null @@ -1,28 +0,0 @@ -/* Set default memcmp impl based on ISA level. - Copyright (C) 2022-2023 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - . */ - -#include -#if MINIMUM_X86_ISA_LEVEL == 1 || MINIMUM_X86_ISA_LEVEL == 2 -# define DEFAULT_MEMCMP __memcmp_sse2 -#elif MINIMUM_X86_ISA_LEVEL == 3 -# define DEFAULT_MEMCMP __memcmp_avx2_movbe -#elif MINIMUM_X86_ISA_LEVEL == 4 -# define DEFAULT_MEMCMP __memcmp_evex_movbe -#else -# error "Unknown default memcmp implementation" -#endif diff --git a/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h b/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h index 3fe73ca1c3..c7d8961bb6 100644 --- a/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h +++ b/sysdeps/x86_64/multiarch/dl-symbol-redir-ifunc.h @@ -19,6 +19,8 @@ #ifndef _DL_IFUNC_GENERIC_H #define _DL_IFUNC_GENERIC_H +#ifndef SHARED + #include #if MINIMUM_X86_ISA_LEVEL >= 4 @@ -31,4 +33,17 @@ asm ("memset = " HAVE_MEMSET_IFUNC_GENERIC); + +#if MINIMUM_X86_ISA_LEVEL >= 4 +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_evex_movbe" +#elif MINIMUM_X86_ISA_LEVEL == 3 +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_avx2_movbe" +#else +# define HAVE_MEMCMP_IFUNC_GENERIC "__memcmp_sse2" +#endif + +asm ("memcmp = " HAVE_MEMCMP_IFUNC_GENERIC); 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:16 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 10/19] s390: Use dl-symbol-redir-ifunc.h on cpu-tunables Date: Mon, 6 Nov 2023 17:25:43 -0300 Message-Id: <20231106202552.3404059-11-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_STOCKGEN, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Using the memcmp symbol directly allows the compile to inline the memcmp calls (especially because _dl_tunable_set_hwcaps uses constants values), generating better code. Checked with tst-tunables on s390x-linux-gnu (qemu system). Reviewed-by: Siddhesh Poyarekar --- sysdeps/s390/cpu-features.c | 30 +++++++++---------- .../s390/multiarch/dl-symbol-redir-ifunc.h | 2 ++ 2 files changed, 17 insertions(+), 15 deletions(-) diff --git a/sysdeps/s390/cpu-features.c b/sysdeps/s390/cpu-features.c index 39f8c23a60..55449ba07f 100644 --- a/sysdeps/s390/cpu-features.c +++ b/sysdeps/s390/cpu-features.c @@ -21,7 +21,7 @@ #include #include #include -extern __typeof (memcmp) MEMCMP_DEFAULT; +#include #define S390_COPY_CPU_FEATURES(SRC_PTR, DEST_PTR) \ (DEST_PTR)->hwcap = (SRC_PTR)->hwcap; \ @@ -89,9 +89,9 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) if ((*feature == 'z' || *feature == 'a')) { if ((feature_len == 5 && *feature == 'z' - && MEMCMP_DEFAULT (feature, "zEC12", 5) == 0) + && memcmp (feature, "zEC12", 5) == 0) || (feature_len == 6 && *feature == 'a' - && MEMCMP_DEFAULT (feature, "arch10", 6) == 0)) + && memcmp (feature, "arch10", 6) == 0)) { reset_features = true; disable = true; @@ -100,9 +100,9 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } else if ((feature_len == 3 && *feature == 'z' - && MEMCMP_DEFAULT (feature, "z13", 3) == 0) + && memcmp (feature, "z13", 3) == 0) || (feature_len == 6 && *feature == 'a' - && MEMCMP_DEFAULT (feature, "arch11", 6) == 0)) + && memcmp (feature, "arch11", 6) == 0)) { reset_features = true; disable = true; @@ -110,9 +110,9 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } else if ((feature_len == 3 && *feature == 'z' - && MEMCMP_DEFAULT (feature, "z14", 3) == 0) + && memcmp (feature, "z14", 3) == 0) || (feature_len == 6 && *feature == 'a' - && MEMCMP_DEFAULT (feature, "arch12", 6) == 0)) + && memcmp (feature, "arch12", 6) == 0)) { reset_features = true; disable = true; @@ -120,11 +120,11 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } else if ((feature_len == 3 && *feature == 'z' - && (MEMCMP_DEFAULT (feature, "z15", 3) == 0 - || MEMCMP_DEFAULT (feature, "z16", 3) == 0)) + && (memcmp (feature, "z15", 3) == 0 + || memcmp (feature, "z16", 3) == 0)) || (feature_len == 6 - && (MEMCMP_DEFAULT (feature, "arch13", 6) == 0 - || MEMCMP_DEFAULT (feature, "arch14", 6) == 0))) + && (memcmp (feature, "arch13", 6) == 0 + || memcmp (feature, "arch14", 6) == 0))) { /* For z15 or newer we don't have to disable something, but we have to reset to the original values. */ @@ -134,14 +134,14 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) else if (*feature == 'H') { if (feature_len == 15 - && MEMCMP_DEFAULT (feature, "HWCAP_S390_VXRS", 15) == 0) + && memcmp (feature, "HWCAP_S390_VXRS", 15) == 0) { hwcap_mask = HWCAP_S390_VXRS; if (disable) hwcap_mask |= HWCAP_S390_VXRS_EXT | HWCAP_S390_VXRS_EXT2; } else if (feature_len == 19 - && MEMCMP_DEFAULT (feature, "HWCAP_S390_VXRS_EXT", 19) == 0) + && memcmp (feature, "HWCAP_S390_VXRS_EXT", 19) == 0) { hwcap_mask = HWCAP_S390_VXRS_EXT; if (disable) @@ -150,7 +150,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) hwcap_mask |= HWCAP_S390_VXRS; } else if (feature_len == 20 - && MEMCMP_DEFAULT (feature, "HWCAP_S390_VXRS_EXT2", 20) == 0) + && memcmp (feature, "HWCAP_S390_VXRS_EXT2", 20) == 0) { hwcap_mask = HWCAP_S390_VXRS_EXT2; if (!disable) @@ -160,7 +160,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) else if (*feature == 'S') { if (feature_len == 10 - && MEMCMP_DEFAULT (feature, "STFLE_MIE3", 10) == 0) + && memcmp (feature, "STFLE_MIE3", 10) == 0) { stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } diff --git a/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h b/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h index aa084fdcde..0f58897c48 100644 --- a/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h +++ b/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h @@ -20,10 +20,12 @@ #define _DL_IFUNC_GENERIC_H #include +#include #define IFUNC_SYMBOL_STR1(s) #s #define IFUNC_SYMBOL_STR(s) IFUNC_SYMBOL_STR1(s) asm ("memset = " IFUNC_SYMBOL_STR(MEMSET_DEFAULT)); 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:18 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 11/19] elf: Do not duplicate the GLIBC_TUNABLES string Date: Mon, 6 Nov 2023 17:25:44 -0300 Message-Id: <20231106202552.3404059-12-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org The tunable parsing duplicates the tunable environment variable so it null-terminates each one since it simplifies the later parsing. It has the drawback of adding another point of failure (__minimal_malloc failing), and the memory copy requires tuning the compiler to avoid mem operations calls. The parsing now tracks the tunable start and its size. The dl-tunable-parse.h adds helper functions to help parsing, like a strcmp that also checks for size and an iterator for suboptions that are comma-separated (used on hwcap parsing by x86, powerpc, and s390x). Since the environment variable is allocated on the stack by the kernel, it is safe to keep the references to the suboptions for later parsing of string tunables (as done by set_hwcaps by multiple architectures). Checked on x86_64-linux-gnu, powerpc64le-linux-gnu, and aarch64-linux-gnu. --- elf/dl-tunables.c | 66 +++---- elf/dl-tunables.h | 6 +- elf/tst-tunables.c | 66 ++++++- sysdeps/generic/dl-tunables-parse.h | 129 ++++++++++++++ sysdeps/s390/cpu-features.c | 167 +++++++----------- .../unix/sysv/linux/aarch64/cpu-features.c | 38 ++-- .../unix/sysv/linux/powerpc/cpu-features.c | 45 ++--- .../sysv/linux/powerpc/tst-hwcap-tunables.c | 6 +- sysdeps/x86/Makefile | 4 +- sysdeps/x86/cpu-tunables.c | 118 +++++-------- sysdeps/x86/tst-hwcap-tunables.c | 148 ++++++++++++++++ 11 files changed, 517 insertions(+), 276 deletions(-) create mode 100644 sysdeps/generic/dl-tunables-parse.h create mode 100644 sysdeps/x86/tst-hwcap-tunables.c diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index 6e3e6a2cf8..f406521735 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -36,28 +36,6 @@ #define TUNABLES_INTERNAL 1 #include "dl-tunables.h" -#include - -static char * -tunables_strdup (const char *in) -{ - size_t i = 0; - - while (in[i++] != '\0'); - char *out = __minimal_malloc (i + 1); - - /* For most of the tunables code, we ignore user errors. However, - this is a system error - and running out of memory at program - startup should be reported, so we do. */ - if (out == NULL) - _dl_fatal_printf ("failed to allocate memory to process tunables\n"); - - while (i-- > 0) - out[i] = in[i]; - - return out; -} - static char ** get_next_env (char **envp, char **name, size_t *namelen, char **val, char ***prev_envp) @@ -134,14 +112,14 @@ do_tunable_update_val (tunable_t *cur, const tunable_val_t *valp, /* Validate range of the input value and initialize the tunable CUR if it looks good. */ static void -tunable_initialize (tunable_t *cur, const char *strval) +tunable_initialize (tunable_t *cur, const char *strval, size_t len) { - tunable_val_t val; + tunable_val_t val = { 0 }; if (cur->type.type_code != TUNABLE_TYPE_STRING) val.numval = (tunable_num_t) _dl_strtoul (strval, NULL); else - val.strval = strval; + val.strval = (struct tunable_str_t) { strval, len }; do_tunable_update_val (cur, &val, NULL, NULL); } @@ -158,29 +136,29 @@ struct tunable_toset_t { tunable_t *t; const char *value; + size_t len; }; enum { tunables_list_size = array_length (tunable_list) }; /* Parse the tunable string VALSTRING and set TUNABLES with the found tunables - and their respectibles values. VALSTRING is a duplicated values, where - delimiters ':' are replaced with '\0', so string tunables are null - terminated. + and their respectibles values. The VALSTRING is parsed in place, with the + tunable start and size recorded in TUNABLES. Return the number of tunables found (including 0 if the string is empty) or -1 if for a ill-formatted definition. */ static int -parse_tunables_string (char *valstring, struct tunable_toset_t *tunables) +parse_tunables_string (const char *valstring, struct tunable_toset_t *tunables) { if (valstring == NULL || *valstring == '\0') return 0; - char *p = valstring; + const char *p = valstring; bool done = false; int ntunables = 0; while (!done) { - char *name = p; + const char *name = p; /* First, find where the name ends. */ while (*p != '=' && *p != ':' && *p != '\0') @@ -202,7 +180,7 @@ parse_tunables_string (char *valstring, struct tunable_toset_t *tunables) /* Skip the '='. */ p++; - char *value = p; + const char *value = p; while (*p != '=' && *p != ':' && *p != '\0') p++; @@ -211,8 +189,6 @@ parse_tunables_string (char *valstring, struct tunable_toset_t *tunables) return -1; else if (*p == '\0') done = true; - else - *p++ = '\0'; /* Add the tunable if it exists. */ for (size_t i = 0; i < tunables_list_size; i++) @@ -221,7 +197,8 @@ parse_tunables_string (char *valstring, struct tunable_toset_t *tunables) if (tunable_is_name (cur->name, name)) { - tunables[ntunables++] = (struct tunable_toset_t) { cur, value }; + tunables[ntunables++] = + (struct tunable_toset_t) { cur, value, p - value }; break; } } @@ -231,7 +208,7 @@ parse_tunables_string (char *valstring, struct tunable_toset_t *tunables) } static void -parse_tunables (char *valstring) +parse_tunables (const char *valstring) { struct tunable_toset_t tunables[tunables_list_size]; int ntunables = parse_tunables_string (valstring, tunables); @@ -243,7 +220,7 @@ parse_tunables (char *valstring) } for (int i = 0; i < ntunables; i++) - tunable_initialize (tunables[i].t, tunables[i].value); + tunable_initialize (tunables[i].t, tunables[i].value, tunables[i].len); } /* Initialize the tunables list from the environment. For now we only use the @@ -264,9 +241,12 @@ __tunables_init (char **envp) while ((envp = get_next_env (envp, &envname, &len, &envval, &prev_envp)) != NULL) { + /* The environment variable is allocated on the stack by the kernel, so + it is safe to keep the references to the suboptions for later parsing + of string tunables. */ if (tunable_is_name ("GLIBC_TUNABLES", envname)) { - parse_tunables (tunables_strdup (envval)); + parse_tunables (envval); continue; } @@ -284,7 +264,7 @@ __tunables_init (char **envp) /* We have a match. Initialize and move on to the next line. */ if (tunable_is_name (name, envname)) { - tunable_initialize (cur, envval); + tunable_initialize (cur, envval, len); break; } } @@ -298,7 +278,7 @@ __tunables_print (void) { const tunable_t *cur = &tunable_list[i]; if (cur->type.type_code == TUNABLE_TYPE_STRING - && cur->val.strval == NULL) + && cur->val.strval.str == NULL) _dl_printf ("%s:\n", cur->name); else { @@ -324,7 +304,9 @@ __tunables_print (void) (size_t) cur->type.max); break; case TUNABLE_TYPE_STRING: - _dl_printf ("%s\n", cur->val.strval); + _dl_printf ("%.*s\n", + (int) cur->val.strval.len, + cur->val.strval.str); break; default: __builtin_unreachable (); @@ -359,7 +341,7 @@ __tunable_get_val (tunable_id_t id, void *valp, tunable_callback_t callback) } case TUNABLE_TYPE_STRING: { - *((const char **)valp) = cur->val.strval; + *((struct tunable_str_t **) valp) = &cur->val.strval; break; } default: diff --git a/elf/dl-tunables.h b/elf/dl-tunables.h index 45c191e021..0e777d7d37 100644 --- a/elf/dl-tunables.h +++ b/elf/dl-tunables.h @@ -30,7 +30,11 @@ typedef intmax_t tunable_num_t; typedef union { tunable_num_t numval; - const char *strval; + struct tunable_str_t + { + const char *str; + size_t len; + } strval; } tunable_val_t; typedef void (*tunable_callback_t) (tunable_val_t *); diff --git a/elf/tst-tunables.c b/elf/tst-tunables.c index e1ad44f27c..188345b070 100644 --- a/elf/tst-tunables.c +++ b/elf/tst-tunables.c @@ -31,7 +31,8 @@ static int restart; static const struct test_t { - const char *env; + const char *name; + const char *value; int32_t expected_malloc_check; size_t expected_mmap_threshold; int32_t expected_perturb; @@ -39,12 +40,14 @@ static const struct test_t { /* Expected tunable format. */ { + "GLIBC_TUNABLES", "glibc.malloc.check=2", 2, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096", 2, 4096, @@ -52,6 +55,7 @@ static const struct test_t }, /* Empty tunable are ignored. */ { + "GLIBC_TUNABLES", "glibc.malloc.check=2::glibc.malloc.mmap_threshold=4096", 2, 4096, @@ -59,6 +63,7 @@ static const struct test_t }, /* As well empty values. */ { + "GLIBC_TUNABLES", "glibc.malloc.check=:glibc.malloc.mmap_threshold=4096", 0, 4096, @@ -66,18 +71,21 @@ static const struct test_t }, /* Tunable are processed from left to right, so last one is the one set. */ { + "GLIBC_TUNABLES", "glibc.malloc.check=1:glibc.malloc.check=2", 2, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=1:glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096", 2, 4096, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096:glibc.malloc.check=1", 1, 4096, @@ -85,12 +93,14 @@ static const struct test_t }, /* 0x800 is larger than tunable maxval (0xff), so the tunable is unchanged. */ { + "GLIBC_TUNABLES", "glibc.malloc.perturb=0x800", 0, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.perturb=0x55", 0, 0, @@ -98,6 +108,7 @@ static const struct test_t }, /* Out of range values are just ignored. */ { + "GLIBC_TUNABLES", "glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096", 0, 4096, @@ -105,24 +116,28 @@ static const struct test_t }, /* Invalid keys are ignored. */ { + "GLIBC_TUNABLES", ":glibc.malloc.garbage=2:glibc.malloc.check=1", 1, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096", 0, 4096, 0, }, { + "GLIBC_TUNABLES", "glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096", 0, 4096, 0, }, { + "GLIBC_TUNABLES", "not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096", 0, 4096, @@ -130,24 +145,28 @@ static const struct test_t }, /* Invalid subkeys are ignored. */ { + "GLIBC_TUNABLES", "glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2", 2, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096", 0, 0, 0, }, { + "GLIBC_TUNABLES", "not_valid.malloc.check=2", 0, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.not_valid.check=2", 0, 0, @@ -156,6 +175,7 @@ static const struct test_t /* An ill-formatted tunable in the for key=key=value will considere the value as 'key=value' (which can not be parsed as an integer). */ { + "GLIBC_TUNABLES", "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096", 0, 0, @@ -163,41 +183,77 @@ static const struct test_t }, /* Ill-formatted tunables string is not parsed. */ { + "GLIBC_TUNABLES", "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2", 0, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=2=2", 0, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=2=2:glibc.malloc.mmap_threshold=4096", 0, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=2=2:glibc.malloc.check=2", 0, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096", 0, 0, 0, }, { + "GLIBC_TUNABLES", "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096", 0, 0, 0, }, + /* Also check some tunable aliases. */ + { + "MALLOC_CHECK_", + "2", + 2, + 0, + 0, + }, + { + "MALLOC_MMAP_THRESHOLD_", + "4096", + 0, + 4096, + 0, + }, + { + "MALLOC_PERTURB_", + "0x55", + 0, + 0, + 0x55, + }, + /* 0x800 is larger than tunable maxval (0xff), so the tunable is unchanged. */ + { + "MALLOC_PERTURB_", + "0x800", + 0, + 0, + 0, + }, }; static int @@ -245,13 +301,17 @@ do_test (int argc, char *argv[]) { snprintf (nteststr, sizeof nteststr, "%d", i); - printf ("[%d] Spawned test for %s\n", i, tests[i].env); - setenv ("GLIBC_TUNABLES", tests[i].env, 1); + printf ("[%d] Spawned test for %s=%s\n", + i, + tests[i].name, + tests[i].value); + setenv (tests[i].name, tests[i].value, 1); struct support_capture_subprocess result = support_capture_subprogram (spargv[0], spargv); support_capture_subprocess_check (&result, "tst-tunables", 0, sc_allow_stderr); support_capture_subprocess_free (&result); + unsetenv (tests[i].name); } return 0; diff --git a/sysdeps/generic/dl-tunables-parse.h b/sysdeps/generic/dl-tunables-parse.h new file mode 100644 index 0000000000..5b399f852d --- /dev/null +++ b/sysdeps/generic/dl-tunables-parse.h @@ -0,0 +1,129 @@ +/* Helper functions to handle tunable strings. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _DL_TUNABLES_PARSE_H +#define _DL_TUNABLES_PARSE_H 1 + +#include + +/* Compare the contents of STRVAL with STR of size LEN. The STR might not + be null-terminated. */ +static __always_inline bool +tunable_strcmp (const struct tunable_str_t *strval, const char *str, + size_t len) +{ + return strval->len == len && memcmp (strval->str, str, len) == 0; +} +#define tunable_strcmp_cte(__tunable, __str) \ + tunable_strcmp (&__tunable->strval, __str, sizeof (__str) - 1) + +/* + Helper functions to iterate over a tunable string composed by multiple + suboptions separated by commaxi; this is a common pattern for CPU. Each + suboptions is return in the form of { address, size } (no null terminated). + For instance: + + struct tunable_str_comma_t ts; + tunable_str_comma_init (&ts, valp); + + struct tunable_str_t t; + while (tunable_str_comma_next (&ts, &t)) + { + _dl_printf ("[%s] %.*s (%d)\n", + __func__, + (int) tstr.len, + tstr.str, + (int) tstr.len); + + if (tunable_str_comma_strcmp (&t, opt, opt1_len)) + { + [...] + } + else if (tunable_str_comma_strcmp_cte (&t, "opt2")) + { + [...] + } + } +*/ + +struct tunable_str_comma_state_t +{ + const char *p; + size_t plen; + size_t maxplen; +}; + +struct tunable_str_comma_t +{ + const char *str; + size_t len; + bool disable; +}; + +static inline void +tunable_str_comma_init (struct tunable_str_comma_state_t *state, + tunable_val_t *valp) +{ + state->p = valp->strval.str; + state->plen = 0; + state->maxplen = valp->strval.len; +} + +static inline bool +tunable_str_comma_next (struct tunable_str_comma_state_t *state, + struct tunable_str_comma_t *str) +{ + if (*state->p == '\0' || state->plen >= state->maxplen) + return false; + + const char *c; + for (c = state->p; *c != ','; c++, state->plen++) + if (*c == '\0' || state->plen == state->maxplen) + break; + + str->str = state->p; + str->len = c - state->p; + + if (str->len > 0) + { + str->disable = *str->str == '-'; + if (str->disable) + { + str->str = str->str + 1; + str->len = str->len - 1; + } + } + + state->p = c + 1; + state->plen++; + + return true; +} + +/* Compare the contents of T with STR of size LEN. The STR might not be + null-terminated. */ +static __always_inline bool +tunable_str_comma_strcmp (const struct tunable_str_comma_t *t, const char *str, + size_t len) +{ + return t->len == len && memcmp (t->str, str, len) == 0; +} +#define tunable_str_comma_strcmp_cte(__t, __str) \ + tunable_str_comma_strcmp (__t, __str, sizeof (__str) - 1) + +#endif diff --git a/sysdeps/s390/cpu-features.c b/sysdeps/s390/cpu-features.c index 55449ba07f..8b1466fa7b 100644 --- a/sysdeps/s390/cpu-features.c +++ b/sysdeps/s390/cpu-features.c @@ -22,6 +22,7 @@ #include #include #include +#include #define S390_COPY_CPU_FEATURES(SRC_PTR, DEST_PTR) \ (DEST_PTR)->hwcap = (SRC_PTR)->hwcap; \ @@ -51,33 +52,14 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) struct cpu_features cpu_features_curr; S390_COPY_CPU_FEATURES (cpu_features, &cpu_features_curr); - const char *token = valp->strval; - do + struct tunable_str_comma_state_t ts; + tunable_str_comma_init (&ts, valp); + + struct tunable_str_comma_t t; + while (tunable_str_comma_next (&ts, &t)) { - const char *token_end, *feature; - bool disable; - size_t token_len; - size_t feature_len; - - /* Find token separator or end of string. */ - for (token_end = token; *token_end != ','; token_end++) - if (*token_end == '\0') - break; - - /* Determine feature. */ - token_len = token_end - token; - if (*token == '-') - { - disable = true; - feature = token + 1; - feature_len = token_len - 1; - } - else - { - disable = false; - feature = token; - feature_len = token_len; - } + if (t.len == 0) + continue; /* Handle only the features here which are really used in the IFUNC-resolvers. All others are ignored as the values are only used @@ -85,85 +67,65 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) bool reset_features = false; unsigned long int hwcap_mask = 0UL; unsigned long long stfle_bits0_mask = 0ULL; + bool disable = t.disable; - if ((*feature == 'z' || *feature == 'a')) + if (tunable_str_comma_strcmp_cte (&t, "zEC12") + || tunable_str_comma_strcmp_cte (&t, "arch10")) + { + reset_features = true; + disable = true; + hwcap_mask = HWCAP_S390_VXRS | HWCAP_S390_VXRS_EXT + | HWCAP_S390_VXRS_EXT2; + stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; + } + else if (tunable_str_comma_strcmp_cte (&t, "z13") + || tunable_str_comma_strcmp_cte (&t, "arch11")) + { + reset_features = true; + disable = true; + hwcap_mask = HWCAP_S390_VXRS_EXT | HWCAP_S390_VXRS_EXT2; + stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; + } + else if (tunable_str_comma_strcmp_cte (&t, "z14") + || tunable_str_comma_strcmp_cte (&t, "arch12")) + { + reset_features = true; + disable = true; + hwcap_mask = HWCAP_S390_VXRS_EXT2; + stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; + } + else if (tunable_str_comma_strcmp_cte (&t, "z15") + || tunable_str_comma_strcmp_cte (&t, "z16") + || tunable_str_comma_strcmp_cte (&t, "arch13") + || tunable_str_comma_strcmp_cte (&t, "arch14")) { - if ((feature_len == 5 && *feature == 'z' - && memcmp (feature, "zEC12", 5) == 0) - || (feature_len == 6 && *feature == 'a' - && memcmp (feature, "arch10", 6) == 0)) - { - reset_features = true; - disable = true; - hwcap_mask = HWCAP_S390_VXRS | HWCAP_S390_VXRS_EXT - | HWCAP_S390_VXRS_EXT2; - stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; - } - else if ((feature_len == 3 && *feature == 'z' - && memcmp (feature, "z13", 3) == 0) - || (feature_len == 6 && *feature == 'a' - && memcmp (feature, "arch11", 6) == 0)) - { - reset_features = true; - disable = true; - hwcap_mask = HWCAP_S390_VXRS_EXT | HWCAP_S390_VXRS_EXT2; - stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; - } - else if ((feature_len == 3 && *feature == 'z' - && memcmp (feature, "z14", 3) == 0) - || (feature_len == 6 && *feature == 'a' - && memcmp (feature, "arch12", 6) == 0)) - { - reset_features = true; - disable = true; - hwcap_mask = HWCAP_S390_VXRS_EXT2; - stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; - } - else if ((feature_len == 3 && *feature == 'z' - && (memcmp (feature, "z15", 3) == 0 - || memcmp (feature, "z16", 3) == 0)) - || (feature_len == 6 - && (memcmp (feature, "arch13", 6) == 0 - || memcmp (feature, "arch14", 6) == 0))) - { - /* For z15 or newer we don't have to disable something, - but we have to reset to the original values. */ - reset_features = true; - } + /* For z15 or newer we don't have to disable something, but we have + to reset to the original values. */ + reset_features = true; } - else if (*feature == 'H') + else if (tunable_str_comma_strcmp_cte (&t, "HWCAP_S390_VXRS")) { - if (feature_len == 15 - && memcmp (feature, "HWCAP_S390_VXRS", 15) == 0) - { - hwcap_mask = HWCAP_S390_VXRS; - if (disable) - hwcap_mask |= HWCAP_S390_VXRS_EXT | HWCAP_S390_VXRS_EXT2; - } - else if (feature_len == 19 - && memcmp (feature, "HWCAP_S390_VXRS_EXT", 19) == 0) - { - hwcap_mask = HWCAP_S390_VXRS_EXT; - if (disable) - hwcap_mask |= HWCAP_S390_VXRS_EXT2; - else - hwcap_mask |= HWCAP_S390_VXRS; - } - else if (feature_len == 20 - && memcmp (feature, "HWCAP_S390_VXRS_EXT2", 20) == 0) - { - hwcap_mask = HWCAP_S390_VXRS_EXT2; - if (!disable) - hwcap_mask |= HWCAP_S390_VXRS | HWCAP_S390_VXRS_EXT; - } + hwcap_mask = HWCAP_S390_VXRS; + if (t.disable) + hwcap_mask |= HWCAP_S390_VXRS_EXT | HWCAP_S390_VXRS_EXT2; } - else if (*feature == 'S') + else if (tunable_str_comma_strcmp_cte (&t, "HWCAP_S390_VXRS_EXT")) { - if (feature_len == 10 - && memcmp (feature, "STFLE_MIE3", 10) == 0) - { - stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; - } + hwcap_mask = HWCAP_S390_VXRS_EXT; + if (t.disable) + hwcap_mask |= HWCAP_S390_VXRS_EXT2; + else + hwcap_mask |= HWCAP_S390_VXRS; + } + else if (tunable_str_comma_strcmp_cte (&t, "HWCAP_S390_VXRS_EXT2")) + { + hwcap_mask = HWCAP_S390_VXRS_EXT2; + if (!t.disable) + hwcap_mask |= HWCAP_S390_VXRS | HWCAP_S390_VXRS_EXT; + } + else if (tunable_str_comma_strcmp_cte (&t, "STFLE_MIE3")) + { + stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } /* Perform the actions determined above. */ @@ -187,14 +149,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) else cpu_features_curr.stfle_bits[0] |= stfle_bits0_mask; } - - /* Jump over current token ... */ - token += token_len; - - /* ... and skip token separator for next round. */ - if (*token == ',') token++; } - while (*token != '\0'); /* Copy back the features after checking that no unsupported features were enabled by user. */ diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c index 233d5b2407..9b76cb89c7 100644 --- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c +++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c @@ -16,10 +16,12 @@ License along with the GNU C Library; if not, see . */ +#include #include #include #include #include +#include #define DCZID_DZP_MASK (1 << 4) #define DCZID_BS_MASK (0xf) @@ -33,28 +35,32 @@ struct cpu_list { const char *name; + size_t len; uint64_t midr; }; -static struct cpu_list cpu_list[] = { - {"falkor", 0x510FC000}, - {"thunderxt88", 0x430F0A10}, - {"thunderx2t99", 0x431F0AF0}, - {"thunderx2t99p1", 0x420F5160}, - {"phecda", 0x680F0000}, - {"ares", 0x411FD0C0}, - {"emag", 0x503F0001}, - {"kunpeng920", 0x481FD010}, - {"a64fx", 0x460F0010}, - {"generic", 0x0} +static const struct cpu_list cpu_list[] = +{ +#define CPU_LIST_ENTRY(__str, __num) { __str, sizeof (__str) - 1, __num } + CPU_LIST_ENTRY ("falkor", 0x510FC000), + CPU_LIST_ENTRY ("thunderxt88", 0x430F0A10), + CPU_LIST_ENTRY ("thunderx2t99", 0x431F0AF0), + CPU_LIST_ENTRY ("thunderx2t99p1", 0x420F5160), + CPU_LIST_ENTRY ("phecda", 0x680F0000), + CPU_LIST_ENTRY ("ares", 0x411FD0C0), + CPU_LIST_ENTRY ("emag", 0x503F0001), + CPU_LIST_ENTRY ("kunpeng920", 0x481FD010), + CPU_LIST_ENTRY ("a64fx", 0x460F0010), + CPU_LIST_ENTRY ("generic", 0x0), }; static uint64_t -get_midr_from_mcpu (const char *mcpu) +get_midr_from_mcpu (const struct tunable_str_t *mcpu) { - for (int i = 0; i < sizeof (cpu_list) / sizeof (struct cpu_list); i++) - if (strcmp (mcpu, cpu_list[i].name) == 0) + for (int i = 0; i < array_length (cpu_list); i++) { + if (tunable_strcmp (mcpu, cpu_list[i].name, cpu_list[i].len)) return cpu_list[i].midr; + } return UINT64_MAX; } @@ -65,7 +71,9 @@ init_cpu_features (struct cpu_features *cpu_features) register uint64_t midr = UINT64_MAX; /* Get the tunable override. */ - const char *mcpu = TUNABLE_GET (glibc, cpu, name, const char *, NULL); + const struct tunable_str_t *mcpu = TUNABLE_GET (glibc, cpu, name, + struct tunable_str_t *, + NULL); if (mcpu != NULL) midr = get_midr_from_mcpu (mcpu); diff --git a/sysdeps/unix/sysv/linux/powerpc/cpu-features.c b/sysdeps/unix/sysv/linux/powerpc/cpu-features.c index 7c6e20e702..390b3fd11a 100644 --- a/sysdeps/unix/sysv/linux/powerpc/cpu-features.c +++ b/sysdeps/unix/sysv/linux/powerpc/cpu-features.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -43,41 +44,26 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) struct cpu_features *cpu_features = &GLRO(dl_powerpc_cpu_features); unsigned long int tcbv_hwcap = cpu_features->hwcap; unsigned long int tcbv_hwcap2 = cpu_features->hwcap2; - const char *token = valp->strval; - do + + struct tunable_str_comma_state_t ts; + tunable_str_comma_init (&ts, valp); + + struct tunable_str_comma_t t; + while (tunable_str_comma_next (&ts, &t)) { - const char *token_end, *feature; - bool disable; - size_t token_len, i, feature_len, offset = 0; - /* Find token separator or end of string. */ - for (token_end = token; *token_end != ','; token_end++) - if (*token_end == '\0') - break; + if (t.len == 0) + continue; - /* Determine feature. */ - token_len = token_end - token; - if (*token == '-') - { - disable = true; - feature = token + 1; - feature_len = token_len - 1; - } - else - { - disable = false; - feature = token; - feature_len = token_len; - } - for (i = 0; i < array_length (hwcap_tunables); ++i) + size_t offset = 0; + for (int i = 0; i < array_length (hwcap_tunables); ++i) { const char *hwcap_name = hwcap_names + offset; size_t hwcap_name_len = strlen (hwcap_name); /* Check the tunable name on the supported list. */ - if (hwcap_name_len == feature_len - && memcmp (feature, hwcap_name, feature_len) == 0) + if (tunable_str_comma_strcmp (&t, hwcap_name, hwcap_name_len)) { /* Update the hwcap and hwcap2 bits. */ - if (disable) + if (t.disable) { /* Id is 1 for hwcap2 tunable. */ if (hwcap_tunables[i].id) @@ -98,12 +84,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) } offset += hwcap_name_len + 1; } - token += token_len; - /* ... and skip token separator for next round. */ - if (*token == ',') - token++; } - while (*token != '\0'); } static inline void diff --git a/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c b/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c index 2631016a3a..049164f841 100644 --- a/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c +++ b/sysdeps/unix/sysv/linux/powerpc/tst-hwcap-tunables.c @@ -110,7 +110,11 @@ do_test (int argc, char *argv[]) run_test ("-arch_2_06", "__memcpy_power7"); if (hwcap & PPC_FEATURE_ARCH_2_05) run_test ("-arch_2_06,-arch_2_05","__memcpy_power6"); - run_test ("-arch_2_06,-arch_2_05,-power5+,-power5,-power4", "__memcpy_power4"); + run_test ("-arch_2_06,-arch_2_05,-power5+,-power5,-power4", + "__memcpy_power4"); + /* Also run with valid, but empty settings. */ + run_test (",-,-arch_2_06,-arch_2_05,-power5+,-power5,,-power4,-", + "__memcpy_power4"); } else { diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile index 917c26f116..a64e5f002a 100644 --- a/sysdeps/x86/Makefile +++ b/sysdeps/x86/Makefile @@ -12,7 +12,8 @@ CFLAGS-get-cpuid-feature-leaf.o += $(no-stack-protector) tests += tst-get-cpu-features tst-get-cpu-features-static \ tst-cpu-features-cpuinfo tst-cpu-features-cpuinfo-static \ - tst-cpu-features-supports tst-cpu-features-supports-static + tst-cpu-features-supports tst-cpu-features-supports-static \ + tst-hwcap-tunables tests-static += tst-get-cpu-features-static \ tst-cpu-features-cpuinfo-static \ tst-cpu-features-supports-static @@ -65,6 +66,7 @@ $(objpfx)tst-isa-level-1.out: $(objpfx)tst-isa-level-mod-1-baseline.so \ endif tst-ifunc-isa-2-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-SSE4_2,-AVX,-AVX2,-AVX512F tst-ifunc-isa-2-static-ENV = $(tst-ifunc-isa-2-ENV) +tst-hwcap-tunables-ARGS = -- $(host-test-program-cmd) endif ifeq ($(subdir),math) diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c index 5697885226..0608209768 100644 --- a/sysdeps/x86/cpu-tunables.c +++ b/sysdeps/x86/cpu-tunables.c @@ -24,11 +24,12 @@ #include #include #include +#include #include #define CHECK_GLIBC_IFUNC_CPU_OFF(f, cpu_features, name, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (memcmp (f, #name, len) == 0) \ + if (tunable_str_comma_strcmp_cte (&f, #name)) \ { \ CPU_FEATURE_UNSET (cpu_features, name) \ break; \ @@ -38,7 +39,7 @@ which isn't available. */ #define CHECK_GLIBC_IFUNC_PREFERRED_OFF(f, cpu_features, name, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (memcmp (f, #name, len) == 0) \ + if (tunable_str_comma_strcmp_cte (&f, #name) == 0) \ { \ cpu_features->preferred[index_arch_##name] \ &= ~bit_arch_##name; \ @@ -46,12 +47,11 @@ } /* Enable/disable a preferred feature NAME. */ -#define CHECK_GLIBC_IFUNC_PREFERRED_BOTH(f, cpu_features, name, \ - disable, len) \ +#define CHECK_GLIBC_IFUNC_PREFERRED_BOTH(f, cpu_features, name, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (memcmp (f, #name, len) == 0) \ + if (tunable_str_comma_strcmp_cte (&f, #name)) \ { \ - if (disable) \ + if (f.disable) \ cpu_features->preferred[index_arch_##name] &= ~bit_arch_##name; \ else \ cpu_features->preferred[index_arch_##name] |= bit_arch_##name; \ @@ -61,11 +61,11 @@ /* Enable/disable a preferred feature NAME. Enable a preferred feature only if the feature NEED is usable. */ #define CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH(f, cpu_features, name, \ - need, disable, len) \ + need, len) \ _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ - if (memcmp (f, #name, len) == 0) \ + if (tunable_str_comma_strcmp_cte (&f, #name)) \ { \ - if (disable) \ + if (f.disable) \ cpu_features->preferred[index_arch_##name] &= ~bit_arch_##name; \ else if (CPU_FEATURE_USABLE_P (cpu_features, need)) \ cpu_features->preferred[index_arch_##name] |= bit_arch_##name; \ @@ -93,38 +93,20 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) NOTE: the IFUNC selection may change over time. Please check all multiarch implementations when experimenting. */ - const char *p = valp->strval, *c; struct cpu_features *cpu_features = &GLRO(dl_x86_cpu_features); - size_t len; - do - { - const char *n; - bool disable; - size_t nl; - - for (c = p; *c != ','; c++) - if (*c == '\0') - break; + struct tunable_str_comma_state_t ts; + tunable_str_comma_init (&ts, valp); - len = c - p; - disable = *p == '-'; - if (disable) - { - n = p + 1; - nl = len - 1; - } - else - { - n = p; - nl = len; - } - switch (nl) + struct tunable_str_comma_t n; + while (tunable_str_comma_next (&ts, &n)) + { + switch (n.len) { default: break; case 3: - if (disable) + if (n.disable) { CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX, 3); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, CX8, 3); @@ -135,7 +117,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) } break; case 4: - if (disable) + if (n.disable) { CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX2, 4); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, BMI1, 4); @@ -149,7 +131,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) } break; case 5: - if (disable) + if (n.disable) { CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, LZCNT, 5); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, MOVBE, 5); @@ -159,12 +141,12 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) } break; case 6: - if (disable) + if (n.disable) { CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, POPCNT, 6); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSE4_1, 6); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSE4_2, 6); - if (memcmp (n, "XSAVEC", 6) == 0) + if (memcmp (n.str, "XSAVEC", 6) == 0) { /* Update xsave_state_size to XSAVE state size. */ cpu_features->xsave_state_size @@ -174,14 +156,14 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) } break; case 7: - if (disable) + if (n.disable) { CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512F, 7); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, OSXSAVE, 7); } break; case 8: - if (disable) + if (n.disable) { CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512CD, 8); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512BW, 8); @@ -190,86 +172,72 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512PF, 8); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512VL, 8); } - CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, Slow_BSF, - disable, 8); + CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, Slow_BSF, 8); break; case 11: { - CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, - Prefer_ERMS, - disable, 11); - CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, - Prefer_FSRM, - disable, 11); + CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, Prefer_ERMS, + 11); + CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, Prefer_FSRM, + 11); CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH (n, cpu_features, Slow_SSE4_2, SSE4_2, - disable, 11); + 11); } break; case 15: { CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, - Fast_Rep_String, - disable, 15); + Fast_Rep_String, 15); } break; case 16: { CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH - (n, cpu_features, Prefer_No_AVX512, AVX512F, - disable, 16); + (n, cpu_features, Prefer_No_AVX512, AVX512F, 16); } break; case 18: { CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, - Fast_Copy_Backward, - disable, 18); + Fast_Copy_Backward, 18); } break; case 19: { CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, - Fast_Unaligned_Load, - disable, 19); + Fast_Unaligned_Load, 19); CHECK_GLIBC_IFUNC_PREFERRED_BOTH (n, cpu_features, - Fast_Unaligned_Copy, - disable, 19); + Fast_Unaligned_Copy, 19); } break; case 20: { CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH - (n, cpu_features, Prefer_No_VZEROUPPER, AVX, disable, - 20); + (n, cpu_features, Prefer_No_VZEROUPPER, AVX, 20); } break; case 23: { CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH - (n, cpu_features, AVX_Fast_Unaligned_Load, AVX, - disable, 23); + (n, cpu_features, AVX_Fast_Unaligned_Load, AVX, 23); } break; case 24: { CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH - (n, cpu_features, MathVec_Prefer_No_AVX512, AVX512F, - disable, 24); + (n, cpu_features, MathVec_Prefer_No_AVX512, AVX512F, 24); } break; case 26: { CHECK_GLIBC_IFUNC_PREFERRED_NEED_BOTH - (n, cpu_features, Prefer_PMINUB_for_stringop, SSE2, - disable, 26); + (n, cpu_features, Prefer_PMINUB_for_stringop, SSE2, 26); } break; } - p += len + 1; } - while (*c != '\0'); } #if CET_ENABLED @@ -277,11 +245,11 @@ attribute_hidden void TUNABLE_CALLBACK (set_x86_ibt) (tunable_val_t *valp) { - if (memcmp (valp->strval, "on", sizeof ("on")) == 0) + if (tunable_strcmp_cte (valp, "on")) GL(dl_x86_feature_control).ibt = cet_always_on; - else if (memcmp (valp->strval, "off", sizeof ("off")) == 0) + else if (tunable_strcmp_cte (valp, "off")) GL(dl_x86_feature_control).ibt = cet_always_off; - else if (memcmp (valp->strval, "permissive", sizeof ("permissive")) == 0) + else if (tunable_strcmp_cte (valp, "permissive")) GL(dl_x86_feature_control).ibt = cet_permissive; } @@ -289,11 +257,11 @@ attribute_hidden void TUNABLE_CALLBACK (set_x86_shstk) (tunable_val_t *valp) { - if (memcmp (valp->strval, "on", sizeof ("on")) == 0) + if (tunable_strcmp_cte (valp, "on")) GL(dl_x86_feature_control).shstk = cet_always_on; - else if (memcmp (valp->strval, "off", sizeof ("off")) == 0) + else if (tunable_strcmp_cte (valp, "off")) GL(dl_x86_feature_control).shstk = cet_always_off; - else if (memcmp (valp->strval, "permissive", sizeof ("permissive")) == 0) + else if (tunable_strcmp_cte (valp, "permissive")) GL(dl_x86_feature_control).shstk = cet_permissive; } #endif diff --git a/sysdeps/x86/tst-hwcap-tunables.c b/sysdeps/x86/tst-hwcap-tunables.c new file mode 100644 index 0000000000..0d0a45fa93 --- /dev/null +++ b/sysdeps/x86/tst-hwcap-tunables.c @@ -0,0 +1,148 @@ +/* Tests for powerpc GLIBC_TUNABLES=glibc.cpu.hwcaps filter. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Nonzero if the program gets called via `exec'. */ +#define CMDLINE_OPTIONS \ + { "restart", no_argument, &restart, 1 }, +static int restart; + +/* Disable everything. */ +static const char *test_1[] = +{ + "__memcpy_avx512_no_vzeroupper", + "__memcpy_avx512_unaligned", + "__memcpy_avx512_unaligned_erms", + "__memcpy_evex_unaligned", + "__memcpy_evex_unaligned_erms", + "__memcpy_avx_unaligned", + "__memcpy_avx_unaligned_erms", + "__memcpy_avx_unaligned_rtm", + "__memcpy_avx_unaligned_erms_rtm", + "__memcpy_ssse3", +}; + +static const struct test_t +{ + const char *env; + const char *const *funcs; + size_t nfuncs; +} tests[] = +{ + { + /* Disable everything. */ + "-Prefer_ERMS,-Prefer_FSRM,-AVX,-AVX2,-AVX_Usable,-AVX2_Usable," + "-AVX512F_Usable,-SSE4_1,-SSE4_2,-SSSE3,-Fast_Unaligned_Load,-ERMS," + "-AVX_Fast_Unaligned_Load", + test_1, + array_length (test_1) + }, + { + /* Same as before, but with some empty suboptions. */ + ",-,-Prefer_ERMS,-Prefer_FSRM,-AVX,-AVX2,-AVX_Usable,-AVX2_Usable," + "-AVX512F_Usable,-SSE4_1,-SSE4_2,,-SSSE3,-Fast_Unaligned_Load,,-,-ERMS," + "-AVX_Fast_Unaligned_Load,-,", + test_1, + array_length (test_1) + } +}; + +/* Called on process re-execution. */ +_Noreturn static void +handle_restart (int ntest) +{ + struct libc_ifunc_impl impls[32]; + int cnt = __libc_ifunc_impl_list ("memcpy", impls, array_length (impls)); + if (cnt == 0) + _exit (EXIT_SUCCESS); + TEST_VERIFY_EXIT (cnt >= 1); + for (int i = 0; i < cnt; i++) + { + for (int f = 0; f < tests[ntest].nfuncs; f++) + { + if (strcmp (impls[i].name, tests[ntest].funcs[f]) == 0) + TEST_COMPARE (impls[i].usable, false); + } + } + + _exit (EXIT_SUCCESS); +} + +static int +do_test (int argc, char *argv[]) +{ + /* We must have either: + - One our fource parameters left if called initially: + + path to ld.so optional + + "--library-path" optional + + the library path optional + + the application name + + the test to check */ + + TEST_VERIFY_EXIT (argc == 2 || argc == 5); + + if (restart) + handle_restart (atoi (argv[1])); + + char nteststr[INT_BUFSIZE_BOUND (int)]; + + char *spargv[10]; + { + int i = 0; + for (; i < argc - 1; i++) + spargv[i] = argv[i + 1]; + spargv[i++] = (char *) "--direct"; + spargv[i++] = (char *) "--restart"; + spargv[i++] = nteststr; + spargv[i] = NULL; + } + + for (int i = 0; i < array_length (tests); i++) + { + snprintf (nteststr, sizeof nteststr, "%d", i); + + printf ("[%d] Spawned test for %s\n", i, tests[i].env); + char *tunable = xasprintf ("glibc.cpu.hwcaps=%s", tests[i].env); + setenv ("GLIBC_TUNABLES", tunable, 1); + + struct support_capture_subprocess result + = support_capture_subprogram (spargv[0], spargv); + support_capture_subprocess_check (&result, "tst-tunables", 0, + sc_allow_stderr); + support_capture_subprocess_free (&result); + + free (tunable); + } + + return 0; +} + +#define TEST_FUNCTION_ARGV do_test +#include From patchwork Mon Nov 6 20:25:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79242 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 3646138555AB for ; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:20 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 12/19] elf: Ignore LD_PROFILE for setuid binaries Date: Mon, 6 Nov 2023 17:25:45 -0300 Message-Id: <20231106202552.3404059-13-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Loader does not ignore LD_PROFILE in secure-execution mode (different than man-page states [1]), rather it uses a different path (/var/profile) and ignore LD_PROFILE_OUTPUT. Allowing secure-execution profiling is already a non good security boundary, since it enables different code paths and extra OS access by the process. But by ignoring LD_PROFILE_OUTPUT, the resulting profile file might also be acceded in a racy manner since the file name does not use any process-specific information (such as pid, timing, etc.). Another side-effect is it forces lazy binding even on libraries that might be with DF_BIND_NOW. [1] https://man7.org/linux/man-pages/man8/ld.so.8.html Reviewed-by: Siddhesh Poyarekar --- elf/Makefile | 3 +++ elf/rtld.c | 8 +++----- elf/tst-env-setuid.c | 12 +++++++++++- 3 files changed, 17 insertions(+), 6 deletions(-) diff --git a/elf/Makefile b/elf/Makefile index 52981c19d0..08896bb895 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -2983,3 +2983,6 @@ $(objpfx)tst-dlclose-lazy.out: \ $(objpfx)tst-dlclose-lazy-mod1.so $(objpfx)tst-dlclose-lazy-mod2.so tst-env-setuid-ARGS = -- $(host-test-program-cmd) + +# Reuse a module with a SONAME, to specific as the LD_PROFILE. +$(objpfx)tst-env-setuid: $(objpfx)tst-sonamemove-runmod2.so diff --git a/elf/rtld.c b/elf/rtld.c index 51b6d9f326..a09cf2a9df 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -361,6 +361,7 @@ struct rtld_global_ro _rtld_global_ro attribute_relro = ._dl_fpu_control = _FPU_DEFAULT, ._dl_pagesize = EXEC_PAGESIZE, ._dl_inhibit_cache = 0, + ._dl_profile_output = "/var/tmp", /* Function pointers. */ ._dl_debug_printf = _dl_debug_printf, @@ -2534,10 +2535,6 @@ process_envvars (struct dl_main_state *state) char *envline; char *debug_output = NULL; - /* This is the default place for profiling data file. */ - GLRO(dl_profile_output) - = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; - while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) { size_t len = 0; @@ -2586,7 +2583,8 @@ process_envvars (struct dl_main_state *state) } /* Which shared object shall be profiled. */ - if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') + if (!__libc_enable_secure + && memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') GLRO(dl_profile) = &envline[8]; break; diff --git a/elf/tst-env-setuid.c b/elf/tst-env-setuid.c index ba295a6a14..76b8e1fb45 100644 --- a/elf/tst-env-setuid.c +++ b/elf/tst-env-setuid.c @@ -34,6 +34,9 @@ static char SETGID_CHILD[] = "setgid-child"; #define FILTERED_VALUE "some-filtered-value" #define UNFILTERED_VALUE "some-unfiltered-value" +/* It assumes no other programs is being profile with a library with same + SONAME using the default folder. */ +#define PROFILE_LIB "tst-sonamemove-runmod2.so" struct envvar_t { @@ -50,7 +53,7 @@ static const struct envvar_t filtered_envvars[] = { "LD_HWCAP_MASK", FILTERED_VALUE }, { "LD_LIBRARY_PATH", FILTERED_VALUE }, { "LD_PRELOAD", FILTERED_VALUE }, - { "LD_PROFILE", FILTERED_VALUE }, + { "LD_PROFILE", "tst-sonamemove-runmod2.so" }, { "MALLOC_ARENA_MAX", FILTERED_VALUE }, { "MALLOC_PERTURB_", FILTERED_VALUE }, { "MALLOC_TRACE", FILTERED_VALUE }, @@ -87,6 +90,13 @@ test_child (void) ret |= !(env != NULL && strcmp (env, e->value) == 0); 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:23 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 13/19] elf: Remove LD_PROFILE for static binaries Date: Mon, 6 Nov 2023 17:25:46 -0300 Message-Id: <20231106202552.3404059-14-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org The _dl_non_dynamic_init does not parse LD_PROFILE, which does not enable profile for dlopen objects. Since dlopen is deprecated for static objects, it is better to remove the support. It also allows to trim down libc.a of profile support. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/Makefile | 10 ++-- elf/dl-load.c | 10 ++-- elf/dl-runtime.c | 12 ++--- elf/dl-support.c | 9 ---- elf/{dl-profstub.c => libc-dl-profstub.c} | 0 include/dlfcn.h | 5 ++ sysdeps/aarch64/dl-machine.h | 4 +- sysdeps/aarch64/dl-trampoline.S | 2 +- sysdeps/alpha/dl-machine.h | 6 ++- sysdeps/alpha/dl-trampoline.S | 4 ++ sysdeps/arm/dl-machine.h | 4 +- sysdeps/arm/dl-trampoline.S | 2 +- sysdeps/hppa/dl-machine.h | 36 +++++++------ sysdeps/hppa/dl-trampoline.S | 2 + sysdeps/i386/dl-machine.h | 2 + sysdeps/i386/dl-trampoline.S | 2 +- sysdeps/ia64/dl-machine.h | 10 ++-- sysdeps/ia64/dl-trampoline.S | 2 +- sysdeps/loongarch/dl-machine.h | 6 ++- sysdeps/loongarch/dl-trampoline.h | 2 + sysdeps/m68k/dl-machine.h | 4 +- sysdeps/m68k/dl-trampoline.S | 2 + sysdeps/powerpc/powerpc32/dl-machine.c | 2 +- sysdeps/powerpc/powerpc32/dl-machine.h | 10 ++-- sysdeps/powerpc/powerpc32/dl-trampoline.S | 2 +- sysdeps/powerpc/powerpc64/dl-machine.h | 20 ++++--- sysdeps/powerpc/powerpc64/dl-trampoline.S | 2 +- sysdeps/s390/s390-32/dl-machine.h | 8 +-- sysdeps/s390/s390-32/dl-trampoline.h | 2 +- sysdeps/s390/s390-64/dl-machine.h | 8 +-- sysdeps/s390/s390-64/dl-trampoline.h | 2 +- sysdeps/sh/dl-machine.h | 2 + sysdeps/sh/dl-trampoline.S | 2 + sysdeps/sparc/sparc32/dl-machine.h | 4 +- sysdeps/sparc/sparc32/dl-trampoline.S | 2 + sysdeps/sparc/sparc64/dl-machine.h | 4 +- sysdeps/sparc/sparc64/dl-trampoline.S | 2 + sysdeps/x86_64/dl-machine.h | 2 + sysdeps/x86_64/dl-trampoline.S | 64 ++++++++++++----------- 39 files changed, 165 insertions(+), 109 deletions(-) rename elf/{dl-profstub.c => libc-dl-profstub.c} (100%) diff --git a/elf/Makefile b/elf/Makefile index 08896bb895..d17ff5424e 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -37,12 +37,12 @@ routines = \ dl-iteratephdr \ dl-libc \ dl-origin \ - dl-profstub \ dl-reloc-static-pie \ dl-support \ dl-sym \ dl-sysdep \ enbl-secure \ + libc-dl-profstub \ libc-dl_find_object \ libc_early_init \ rtld_static_init \ @@ -72,7 +72,6 @@ dl-routines = \ dl-open \ dl-origin \ dl-printf \ - dl-profile \ dl-reloc \ dl-runtime \ dl-scope \ @@ -117,7 +116,11 @@ elide-routines.os = \ # elide-routines.os # These object files are only included in the dynamically-linked libc. -shared-only-routines = libc-dl_find_object +shared-only-routines = \ + libc-dl-profile \ + libc-dl-profstub \ + libc-dl_find_object \ + # shared-only-routines # ld.so uses those routines, plus some special stuff for being the program # interpreter and operating independent of libc. @@ -135,6 +138,7 @@ rtld-routines = \ dl-libc_freeres \ dl-minimal \ dl-mutex \ + dl-profile \ dl-sysdep \ dl-usage \ rtld \ diff --git a/elf/dl-load.c b/elf/dl-load.c index 2923b1141d..7356a4fe48 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -1443,11 +1443,6 @@ cannot enable executable stack as shared object requires"); name by which the DSO is actually known. Add that as well. */ if (__glibc_unlikely (origname != NULL)) add_name_to_object (l, origname); -#else - /* Audit modules only exist when linking is dynamic so ORIGNAME - cannot be non-NULL. */ - assert (origname == NULL); -#endif /* When we profile the SONAME might be needed for something else but loading. Add it right away. */ @@ -1455,6 +1450,11 @@ cannot enable executable stack as shared object requires"); && l->l_info[DT_SONAME] != NULL) add_name_to_object (l, ((const char *) D_PTR (l, l_info[DT_STRTAB]) + l->l_info[DT_SONAME]->d_un.d_val)); +#else + /* Audit modules only exist when linking is dynamic so ORIGNAME + cannot be non-NULL. */ + assert (origname == NULL); +#endif /* If we have newly loaded libc.so, update the namespace description. */ diff --git a/elf/dl-runtime.c b/elf/dl-runtime.c index 32a8bfcf74..fe7deda32a 100644 --- a/elf/dl-runtime.c +++ b/elf/dl-runtime.c @@ -162,14 +162,14 @@ _dl_fixup ( return elf_machine_fixup_plt (l, result, refsym, sym, reloc, rel_addr, value); } -#ifndef PROF +#if !defined PROF && defined SHARED DL_FIXUP_VALUE_TYPE __attribute ((noinline)) DL_ARCH_FIXUP_ATTRIBUTE _dl_profile_fixup ( -#ifdef ELF_MACHINE_RUNTIME_FIXUP_ARGS +# ifdef ELF_MACHINE_RUNTIME_FIXUP_ARGS ELF_MACHINE_RUNTIME_FIXUP_ARGS, -#endif +# endif struct link_map *l, ElfW(Word) reloc_arg, ElfW(Addr) retaddr, void *regs, long int *framesizep) { @@ -309,14 +309,12 @@ _dl_profile_fixup ( /* And now perhaps the relocation addend. */ value = elf_machine_plt_value (l, reloc, value); -#ifdef SHARED /* Auditing checkpoint: we have a new binding. Provide the auditing libraries the possibility to change the value and tell us whether further auditing is wanted. */ if (defsym != NULL && GLRO(dl_naudit) > 0) _dl_audit_symbind (l, reloc_result, reloc, defsym, &value, result, true); -#endif /* Store the result for later runs. */ if (__glibc_likely (! GLRO(dl_bind_not))) @@ -335,11 +333,9 @@ _dl_profile_fixup ( long int framesize = -1; -#ifdef SHARED /* Auditing checkpoint: report the PLT entering and allow the auditors to change the value. */ _dl_audit_pltenter (l, reloc_result, &value, regs, &framesize); -#endif /* Store the frame size information. */ *framesizep = framesize; @@ -349,4 +345,4 @@ _dl_profile_fixup ( return value; } -#endif /* PROF */ +#endif /* !defined PROF && defined SHARED */ diff --git a/elf/dl-support.c b/elf/dl-support.c index 44a54dea07..31a608df87 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -60,10 +60,6 @@ int _dl_dynamic_weak; /* If nonzero print warnings about problematic situations. */ int _dl_verbose; -/* We never do profiling. */ -const char *_dl_profile; -const char *_dl_profile_output; - /* Names of shared object for which the RUNPATHs and RPATHs should be ignored. */ const char *_dl_inhibit_rpath; @@ -301,11 +297,6 @@ _dl_non_dynamic_init (void) _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0'; - _dl_profile_output = getenv ("LD_PROFILE_OUTPUT"); - if (_dl_profile_output == NULL || _dl_profile_output[0] == '\0') - _dl_profile_output - = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0]; - if (__libc_enable_secure) { static const char unsecure_envvars[] = diff --git a/elf/dl-profstub.c b/elf/libc-dl-profstub.c similarity index 100% rename from elf/dl-profstub.c rename to elf/libc-dl-profstub.c diff --git a/include/dlfcn.h b/include/dlfcn.h index ae25f05303..a44420fa37 100644 --- a/include/dlfcn.h +++ b/include/dlfcn.h @@ -135,5 +135,10 @@ extern int __dladdr1 (const void *address, Dl_info *info, extern int __dlinfo (void *handle, int request, void *arg); extern char *__dlerror (void); +#ifndef SHARED +# undef DL_CALL_FCT +# define DL_CALL_FCT(fctp, args) ((fctp) args) +#endif + #endif #endif diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h index 4170b9269f..a56eb96a79 100644 --- a/sysdeps/aarch64/dl-machine.h +++ b/sysdeps/aarch64/dl-machine.h @@ -68,7 +68,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], { ElfW(Addr) *got; extern void _dl_runtime_resolve (ElfW(Word)); - extern void _dl_runtime_profile (ElfW(Word)); got = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]); if (got[1]) @@ -83,6 +82,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED + extern void _dl_runtime_profile (ElfW(Word)); if ( profile) { got[2] = (ElfW(Addr)) &_dl_runtime_profile; @@ -94,6 +95,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif { /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to diff --git a/sysdeps/aarch64/dl-trampoline.S b/sysdeps/aarch64/dl-trampoline.S index a3474ba741..fc82151ba2 100644 --- a/sysdeps/aarch64/dl-trampoline.S +++ b/sysdeps/aarch64/dl-trampoline.S @@ -122,7 +122,7 @@ _dl_runtime_resolve: cfi_endproc .size _dl_runtime_resolve, .-_dl_runtime_resolve -#ifndef PROF +#if !defined PROF && defined SHARED .globl _dl_runtime_profile .type _dl_runtime_profile, #function cfi_startproc diff --git a/sysdeps/alpha/dl-machine.h b/sysdeps/alpha/dl-machine.h index ed5389e3c5..7fe2afca93 100644 --- a/sysdeps/alpha/dl-machine.h +++ b/sysdeps/alpha/dl-machine.h @@ -75,9 +75,7 @@ elf_machine_runtime_setup (struct link_map *map, struct r_scope_elem *scope[], int lazy, int profile) { extern char _dl_runtime_resolve_new[] attribute_hidden; - extern char _dl_runtime_profile_new[] attribute_hidden; extern char _dl_runtime_resolve_old[] attribute_hidden; - extern char _dl_runtime_profile_old[] attribute_hidden; struct pltgot { char *resolve; @@ -109,6 +107,9 @@ elf_machine_runtime_setup (struct link_map *map, struct r_scope_elem *scope[], else resolve = _dl_runtime_resolve_old; +#ifdef SHARED + extern char _dl_runtime_profile_new[] attribute_hidden; + extern char _dl_runtime_profile_old[] attribute_hidden; if (__builtin_expect (profile, 0)) { if (secureplt) @@ -123,6 +124,7 @@ elf_machine_runtime_setup (struct link_map *map, struct r_scope_elem *scope[], GL(dl_profile_map) = map; } } +#endif pg->resolve = resolve; pg->link = map; diff --git a/sysdeps/alpha/dl-trampoline.S b/sysdeps/alpha/dl-trampoline.S index f8c3d33906..5dffa62587 100644 --- a/sysdeps/alpha/dl-trampoline.S +++ b/sysdeps/alpha/dl-trampoline.S @@ -89,6 +89,7 @@ _dl_runtime_resolve_new: .globl _dl_runtime_profile_new .type _dl_runtime_profile_new, @function +#ifdef SHARED #undef FRAMESIZE #define FRAMESIZE 20*8 @@ -207,6 +208,7 @@ _dl_runtime_profile_new: cfi_endproc .size _dl_runtime_profile_new, .-_dl_runtime_profile_new +#endif /* SHARED */ .align 4 .globl _dl_runtime_resolve_old @@ -340,6 +342,7 @@ _dl_runtime_resolve_old: .usepv _dl_runtime_profile_old, no .type _dl_runtime_profile_old, @function +#ifdef SHARED /* We save the registers in a different order than desired by .mask/.fmask, so we have to use explicit cfi directives. */ cfi_startproc @@ -538,3 +541,4 @@ _dl_runtime_profile_old: cfi_endproc .size _dl_runtime_profile_old, .-_dl_runtime_profile_old +#endif /* SHARED */ diff --git a/sysdeps/arm/dl-machine.h b/sysdeps/arm/dl-machine.h index d720c02c96..a68679e653 100644 --- a/sysdeps/arm/dl-machine.h +++ b/sysdeps/arm/dl-machine.h @@ -65,7 +65,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], { Elf32_Addr *got; extern void _dl_runtime_resolve (Elf32_Word); - extern void _dl_runtime_profile (Elf32_Word); if (l->l_info[DT_JMPREL] && lazy) { @@ -88,6 +87,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED + extern void _dl_runtime_profile (Elf32_Word); if (profile) { got[2] = (Elf32_Addr) &_dl_runtime_profile; @@ -99,6 +100,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to the resolved address. */ got[2] = (Elf32_Addr) &_dl_runtime_resolve; diff --git a/sysdeps/arm/dl-trampoline.S b/sysdeps/arm/dl-trampoline.S index 23c2476917..2df5b7ee36 100644 --- a/sysdeps/arm/dl-trampoline.S +++ b/sysdeps/arm/dl-trampoline.S @@ -70,7 +70,7 @@ _dl_runtime_resolve: cfi_endproc .size _dl_runtime_resolve, .-_dl_runtime_resolve -#ifndef PROF +#if !defined PROF && defined SHARED .globl _dl_runtime_profile .type _dl_runtime_profile, #function CFI_SECTIONS diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h index 4e6e70b3c9..993593de5d 100644 --- a/sysdeps/hppa/dl-machine.h +++ b/sysdeps/hppa/dl-machine.h @@ -195,7 +195,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], end_jmprel = jmprel + l->l_info[DT_PLTRELSZ]->d_un.d_val; extern void _dl_runtime_resolve (void); - extern void _dl_runtime_profile (void); /* Linking lazily */ if (lazy) @@ -235,22 +234,9 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], got[1] = (Elf32_Addr) l; /* This function will be called to perform the relocation. */ - if (__builtin_expect (!profile, 1)) - { - /* If a static application called us, then _dl_runtime_resolve is not - a function descriptor, but the *real* address of the function... */ - if((unsigned long) &_dl_runtime_resolve & 3) - { - got[-2] = (Elf32_Addr) ((struct fdesc *) - ((unsigned long) &_dl_runtime_resolve & ~3))->ip; - } - else - { - /* Static executable! */ - got[-2] = (Elf32_Addr) &_dl_runtime_resolve; - } - } - else +#ifdef SHARED + extern void _dl_runtime_profile (void); + if (__glibc_unlikely (profile)) { if (GLRO(dl_profile) != NULL && _dl_name_match_p (GLRO(dl_profile), l)) @@ -272,6 +258,22 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], got[-2] = (Elf32_Addr) &_dl_runtime_profile; } } + else +#endif + { + /* If a static application called us, then _dl_runtime_resolve is not + a function descriptor, but the *real* address of the function... */ + if((unsigned long) &_dl_runtime_resolve & 3) + { + got[-2] = (Elf32_Addr) ((struct fdesc *) + ((unsigned long) &_dl_runtime_resolve & ~3))->ip; + } + else + { + /* Static executable! */ + got[-2] = (Elf32_Addr) &_dl_runtime_resolve; + } + } /* Plunk in the gp of this function descriptor so we can make the call to _dl_runtime_xxxxxx */ got[-1] = ltp; diff --git a/sysdeps/hppa/dl-trampoline.S b/sysdeps/hppa/dl-trampoline.S index 689c6e1a40..9e904df3d2 100644 --- a/sysdeps/hppa/dl-trampoline.S +++ b/sysdeps/hppa/dl-trampoline.S @@ -156,6 +156,7 @@ _dl_runtime_resolve: cfi_endproc .size _dl_runtime_resolve, . - _dl_runtime_resolve +#ifdef SHARED .text .global _dl_runtime_profile .type _dl_runtime_profile,@function @@ -359,3 +360,4 @@ L(cont): .PROCEND cfi_endproc .size _dl_runtime_profile, . - _dl_runtime_profile +#endif diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h index 18749f2ec2..07469e99b0 100644 --- a/sysdeps/i386/dl-machine.h +++ b/sysdeps/i386/dl-machine.h @@ -92,6 +92,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED if (__glibc_unlikely (profile)) { got[2] = (shstk_enabled @@ -105,6 +106,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to the resolved address. */ got[2] = (shstk_enabled diff --git a/sysdeps/i386/dl-trampoline.S b/sysdeps/i386/dl-trampoline.S index 2d55f373b4..3604aabe87 100644 --- a/sysdeps/i386/dl-trampoline.S +++ b/sysdeps/i386/dl-trampoline.S @@ -70,7 +70,7 @@ _dl_runtime_resolve_shstk: cfi_endproc .size _dl_runtime_resolve_shstk, .-_dl_runtime_resolve_shstk -#ifndef PROF +#if !defined PROF && defined SHARED # The SHSTK compatible version. .globl _dl_runtime_profile_shstk .type _dl_runtime_profile_shstk, @function diff --git a/sysdeps/ia64/dl-machine.h b/sysdeps/ia64/dl-machine.h index e1da3dadcb..3ef6b0ef4b 100644 --- a/sysdeps/ia64/dl-machine.h +++ b/sysdeps/ia64/dl-machine.h @@ -121,9 +121,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], reserve[0] = (Elf64_Addr) l; /* This function will be called to perform the relocation. */ - if (!profile) - doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_resolve)->ip; - else +#ifdef SHARED + if (__glibc_unlikely (profile)) { if (GLRO(dl_profile) != NULL && _dl_name_match_p (GLRO(dl_profile), l)) @@ -134,6 +133,11 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], } doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_profile)->ip; } + else +#endif + { + doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_resolve)->ip; + } reserve[1] = doit; reserve[2] = gp; diff --git a/sysdeps/ia64/dl-trampoline.S b/sysdeps/ia64/dl-trampoline.S index 54b33c8c02..10d8432c8f 100644 --- a/sysdeps/ia64/dl-trampoline.S +++ b/sysdeps/ia64/dl-trampoline.S @@ -188,7 +188,7 @@ END(_dl_runtime_resolve) #define PLTENTER_FRAME_SIZE (4*8 + 8*8 + 8*16 + 2*8 + 16) #define PLTEXIT_FRAME_SIZE (PLTENTER_FRAME_SIZE + 4*8 + 8*16) -#ifndef PROF +#if !defined PROF && defined SHARED ENTRY(_dl_runtime_profile) { .mii .prologue diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h index 57913cefaa..0d17fd21e3 100644 --- a/sysdeps/loongarch/dl-machine.h +++ b/sysdeps/loongarch/dl-machine.h @@ -287,15 +287,16 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED if (profile != 0) { -#if !defined __loongarch_soft_float +# if !defined __loongarch_soft_float if (SUPPORT_LASX) gotplt[0] = (ElfW(Addr)) &_dl_runtime_profile_lasx; else if (SUPPORT_LSX) gotplt[0] = (ElfW(Addr)) &_dl_runtime_profile_lsx; else -#endif +# endif gotplt[0] = (ElfW(Addr)) &_dl_runtime_profile; if (GLRO(dl_profile) != NULL @@ -305,6 +306,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif { /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to diff --git a/sysdeps/loongarch/dl-trampoline.h b/sysdeps/loongarch/dl-trampoline.h index e298439d39..1da70aeb23 100644 --- a/sysdeps/loongarch/dl-trampoline.h +++ b/sysdeps/loongarch/dl-trampoline.h @@ -126,6 +126,7 @@ ENTRY (_dl_runtime_resolve) jirl zero, t1, 0 END (_dl_runtime_resolve) +#ifdef SHARED #include "dl-link.h" ENTRY (_dl_runtime_profile) @@ -367,3 +368,4 @@ ENTRY (_dl_runtime_profile) jirl zero, ra, 0 END (_dl_runtime_profile) +#endif /* SHARED */ diff --git a/sysdeps/m68k/dl-machine.h b/sysdeps/m68k/dl-machine.h index 5ee586b27b..8d7e733e2a 100644 --- a/sysdeps/m68k/dl-machine.h +++ b/sysdeps/m68k/dl-machine.h @@ -75,7 +75,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], { Elf32_Addr *got; extern void _dl_runtime_resolve (Elf32_Word); - extern void _dl_runtime_profile (Elf32_Word); if (l->l_info[DT_JMPREL] && lazy) { @@ -93,6 +92,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED + extern void _dl_runtime_profile (Elf32_Word); if (profile) { got[2] = (Elf32_Addr) &_dl_runtime_profile; @@ -106,6 +107,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], } } else +#endif /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to the resolved address. */ got[2] = (Elf32_Addr) &_dl_runtime_resolve; diff --git a/sysdeps/m68k/dl-trampoline.S b/sysdeps/m68k/dl-trampoline.S index dba3741400..f1b4943868 100644 --- a/sysdeps/m68k/dl-trampoline.S +++ b/sysdeps/m68k/dl-trampoline.S @@ -60,6 +60,7 @@ _dl_runtime_resolve: cfi_endproc .size _dl_runtime_resolve, . - _dl_runtime_resolve +#ifdef SHARED .text .globl _dl_runtime_profile .type _dl_runtime_profile, @function @@ -220,3 +221,4 @@ _dl_runtime_profile: rts cfi_endproc .size _dl_runtime_profile, . - _dl_runtime_profile +#endif /* SHARED */ diff --git a/sysdeps/powerpc/powerpc32/dl-machine.c b/sysdeps/powerpc/powerpc32/dl-machine.c index ef84911ede..e6b603de94 100644 --- a/sysdeps/powerpc/powerpc32/dl-machine.c +++ b/sysdeps/powerpc/powerpc32/dl-machine.c @@ -226,7 +226,7 @@ __elf_machine_runtime_setup (struct link_map *map, int lazy, int profile) Elf32_Word dlrr; Elf32_Word offset; -#ifndef PROF +#if !defined PROF && defined SHARED dlrr = (Elf32_Word) (profile ? _dl_prof_resolve : _dl_runtime_resolve); diff --git a/sysdeps/powerpc/powerpc32/dl-machine.h b/sysdeps/powerpc/powerpc32/dl-machine.h index a4cad7583c..1ff46d5f8a 100644 --- a/sysdeps/powerpc/powerpc32/dl-machine.h +++ b/sysdeps/powerpc/powerpc32/dl-machine.h @@ -188,15 +188,19 @@ elf_machine_runtime_setup (struct link_map *map, struct r_scope_elem *scope[], extern void _dl_runtime_resolve (void); extern void _dl_prof_resolve (void); - if (__glibc_likely (!profile)) - dlrr = _dl_runtime_resolve; - else +#ifdef SHARED + if (__glibc_unlikely (profile)) { if (GLRO(dl_profile) != NULL &&_dl_name_match_p (GLRO(dl_profile), map)) GL(dl_profile_map) = map; dlrr = _dl_prof_resolve; } + else +#endif + { + dlrr = _dl_runtime_resolve; + } got = (Elf32_Addr *) map->l_info[DT_PPC(GOT)]->d_un.d_ptr; glink = got[1]; got[1] = (Elf32_Addr) dlrr; diff --git a/sysdeps/powerpc/powerpc32/dl-trampoline.S b/sysdeps/powerpc/powerpc32/dl-trampoline.S index 93b1673ebb..be8de0e2dc 100644 --- a/sysdeps/powerpc/powerpc32/dl-trampoline.S +++ b/sysdeps/powerpc/powerpc32/dl-trampoline.S @@ -70,7 +70,7 @@ _dl_runtime_resolve: cfi_endproc .size _dl_runtime_resolve,.-_dl_runtime_resolve -#ifndef PROF +#if !defined PROF && defined SHARED .align 2 .globl _dl_prof_resolve .type _dl_prof_resolve,@function diff --git a/sysdeps/powerpc/powerpc64/dl-machine.h b/sysdeps/powerpc/powerpc64/dl-machine.h index 449208e86f..601c3cba9d 100644 --- a/sysdeps/powerpc/powerpc64/dl-machine.h +++ b/sysdeps/powerpc/powerpc64/dl-machine.h @@ -362,13 +362,19 @@ elf_machine_runtime_setup (struct link_map *map, struct r_scope_elem *scope[], Elf64_Word offset; Elf64_Addr dlrr; - dlrr = (Elf64_Addr) (profile ? _dl_profile_resolve - : _dl_runtime_resolve); - if (profile && GLRO(dl_profile) != NULL - && _dl_name_match_p (GLRO(dl_profile), map)) - /* This is the object we are looking for. Say that we really - want profiling and the timers are started. */ - GL(dl_profile_map) = map; +#ifdef SHARED + if (__glibc_unlikely (profile)) + { + dlrr = (Elf64_Addr) _dl_profile_resolve; + if (profile && GLRO(dl_profile) != NULL + && _dl_name_match_p (GLRO(dl_profile), map)) + /* This is the object we are looking for. Say that we really + want profiling and the timers are started. */ + GL(dl_profile_map) = map; + } + else +#endif + dlrr = (Elf64_Addr) _dl_runtime_resolve; #if _CALL_ELF != 2 /* We need to stuff the address/TOC of _dl_runtime_resolve diff --git a/sysdeps/powerpc/powerpc64/dl-trampoline.S b/sysdeps/powerpc/powerpc64/dl-trampoline.S index 1d04ec8109..b2fc2bb133 100644 --- a/sysdeps/powerpc/powerpc64/dl-trampoline.S +++ b/sysdeps/powerpc/powerpc64/dl-trampoline.S @@ -195,7 +195,7 @@ END(_dl_runtime_resolve) and r11 contains the link_map (from PLT0+16). The link_map becomes parm1 (r3) and the index (r0) needs to be converted to an offset (index * 24) in parm2 (r4). */ -#ifndef PROF +#if !defined PROF && defined SHARED .hidden _dl_profile_resolve ENTRY (_dl_profile_resolve, 4) /* Spill r30, r31 to preserve the link_map* and reloc_addr, in case we diff --git a/sysdeps/s390/s390-32/dl-machine.h b/sysdeps/s390/s390-32/dl-machine.h index 100a3e05f6..b8bf2796c7 100644 --- a/sysdeps/s390/s390-32/dl-machine.h +++ b/sysdeps/s390/s390-32/dl-machine.h @@ -124,16 +124,17 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED if (__glibc_unlikely (profile)) { -#if defined HAVE_S390_VX_ASM_SUPPORT +# if defined HAVE_S390_VX_ASM_SUPPORT if (GLRO(dl_hwcap) & HWCAP_S390_VX) got[2] = (Elf32_Addr) &_dl_runtime_profile_vx; else got[2] = (Elf32_Addr) &_dl_runtime_profile; -#else +# else got[2] = (Elf32_Addr) &_dl_runtime_profile; -#endif +# endif if (GLRO(dl_profile) != NULL && _dl_name_match_p (GLRO(dl_profile), l)) @@ -142,6 +143,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif { /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to the resolved address. */ diff --git a/sysdeps/s390/s390-32/dl-trampoline.h b/sysdeps/s390/s390-32/dl-trampoline.h index 78fdca9d53..8093ab08d3 100644 --- a/sysdeps/s390/s390-32/dl-trampoline.h +++ b/sysdeps/s390/s390-32/dl-trampoline.h @@ -148,7 +148,7 @@ _dl_runtime_resolve: #undef F0_OFF #undef F2_OFF -#ifndef PROF +#if !defined PROF && defined SHARED # define SIZEOF_STRUCT_LA_S390_32_REGS 168 # define REGS_OFF -264 # define R2_OFF -264 diff --git a/sysdeps/s390/s390-64/dl-machine.h b/sysdeps/s390/s390-64/dl-machine.h index 9fabb09750..82259dad64 100644 --- a/sysdeps/s390/s390-64/dl-machine.h +++ b/sysdeps/s390/s390-64/dl-machine.h @@ -111,16 +111,17 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED if (__glibc_unlikely (profile)) { -#if defined HAVE_S390_VX_ASM_SUPPORT +# if defined HAVE_S390_VX_ASM_SUPPORT if (GLRO(dl_hwcap) & HWCAP_S390_VX) got[2] = (Elf64_Addr) &_dl_runtime_profile_vx; else got[2] = (Elf64_Addr) &_dl_runtime_profile; -#else +# else got[2] = (Elf64_Addr) &_dl_runtime_profile; -#endif +# endif if (GLRO(dl_profile) != NULL && _dl_name_match_p (GLRO(dl_profile), l)) @@ -129,6 +130,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif { /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to the resolved address. */ diff --git a/sysdeps/s390/s390-64/dl-trampoline.h b/sysdeps/s390/s390-64/dl-trampoline.h index 3a7cfc5f92..61188119e6 100644 --- a/sysdeps/s390/s390-64/dl-trampoline.h +++ b/sysdeps/s390/s390-64/dl-trampoline.h @@ -150,7 +150,7 @@ _dl_runtime_resolve: #undef F4_OFF #undef F6_OFF -#ifndef PROF +#if !defined PROF && defined SHARED # define SIZEOF_STRUCT_LA_S390_64_REGS 200 # define REGS_OFF -360 # define R2_OFF -360 diff --git a/sysdeps/sh/dl-machine.h b/sysdeps/sh/dl-machine.h index 0e4eac42c3..e0480eae5a 100644 --- a/sysdeps/sh/dl-machine.h +++ b/sysdeps/sh/dl-machine.h @@ -101,6 +101,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], to intercept the calls to collect information. In this case we don't store the address in the GOT so that all future calls also end in this function. */ +#ifdef SHARED if (profile) { got[2] = (Elf32_Addr) &_dl_runtime_profile; @@ -110,6 +111,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to the resolved address. */ got[2] = (Elf32_Addr) &_dl_runtime_resolve; diff --git a/sysdeps/sh/dl-trampoline.S b/sysdeps/sh/dl-trampoline.S index 5d703341ed..ecaae34db4 100644 --- a/sysdeps/sh/dl-trampoline.S +++ b/sysdeps/sh/dl-trampoline.S @@ -142,6 +142,7 @@ _dl_runtime_resolve: .size _dl_runtime_resolve, .-_dl_runtime_resolve +#ifdef SHARED .globl _dl_runtime_profile .type _dl_runtime_profile,@function cfi_startproc @@ -428,3 +429,4 @@ _dl_runtime_profile: 8: .long _dl_audit_pltexit #endif .size _dl_runtime_profile, .-_dl_runtime_profile +#endif /* SHARED */ diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h index 9b57ae1a93..b10e541810 100644 --- a/sysdeps/sparc/sparc32/dl-machine.h +++ b/sysdeps/sparc/sparc32/dl-machine.h @@ -116,7 +116,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], bits of %g1 with an offset into the .rela.plt section and jump to the beginning of the PLT. */ plt = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); - if (__builtin_expect(profile, 0)) +#ifdef SHARED + if (__glibc_unlikely (profile)) { rfunc = (Elf32_Addr) &_dl_runtime_profile; @@ -125,6 +126,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif { rfunc = (Elf32_Addr) &_dl_runtime_resolve; } diff --git a/sysdeps/sparc/sparc32/dl-trampoline.S b/sysdeps/sparc/sparc32/dl-trampoline.S index 08ff31b474..5e7d860ae4 100644 --- a/sysdeps/sparc/sparc32/dl-trampoline.S +++ b/sysdeps/sparc/sparc32/dl-trampoline.S @@ -47,6 +47,7 @@ _dl_runtime_resolve: .size _dl_runtime_resolve, .-_dl_runtime_resolve +#ifdef SHARED /* For the profiling cases we pass in our stack frame * as the base of the La_sparc32_regs, so it looks * like: @@ -185,3 +186,4 @@ _dl_runtime_profile: cfi_endproc .size _dl_runtime_profile, .-_dl_runtime_profile +#endif diff --git a/sysdeps/sparc/sparc64/dl-machine.h b/sysdeps/sparc/sparc64/dl-machine.h index 2f04ac550e..98469e7604 100644 --- a/sysdeps/sparc/sparc64/dl-machine.h +++ b/sysdeps/sparc/sparc64/dl-machine.h @@ -136,7 +136,8 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], Elf64_Addr res0_addr, res1_addr; unsigned int *plt = (void *) D_PTR (l, l_info[DT_PLTGOT]); - if (__builtin_expect(profile, 0)) +#ifdef SHARED + if (__glibc_unlikely (profile)) { res0_addr = (Elf64_Addr) &_dl_runtime_profile_0; res1_addr = (Elf64_Addr) &_dl_runtime_profile_1; @@ -146,6 +147,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif { res0_addr = (Elf64_Addr) &_dl_runtime_resolve_0; res1_addr = (Elf64_Addr) &_dl_runtime_resolve_1; diff --git a/sysdeps/sparc/sparc64/dl-trampoline.S b/sysdeps/sparc/sparc64/dl-trampoline.S index 444690a71e..82b42681dd 100644 --- a/sysdeps/sparc/sparc64/dl-trampoline.S +++ b/sysdeps/sparc/sparc64/dl-trampoline.S @@ -92,6 +92,7 @@ _dl_runtime_resolve_1: .size _dl_runtime_resolve_1, .-_dl_runtime_resolve_1 +#ifdef SHARED /* For the profiling cases we pass in our stack frame * as the base of the La_sparc64_regs, so it looks * like: @@ -323,3 +324,4 @@ _dl_runtime_profile_1: cfi_endproc .size _dl_runtime_resolve_1, .-_dl_runtime_resolve_1 +#endif diff --git a/sysdeps/x86_64/dl-machine.h b/sysdeps/x86_64/dl-machine.h index 9ea2a70837..581a2f1a9e 100644 --- a/sysdeps/x86_64/dl-machine.h +++ b/sysdeps/x86_64/dl-machine.h @@ -89,6 +89,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], const struct cpu_features* cpu_features = __get_cpu_features (); +#ifdef SHARED /* The got[2] entry contains the address of a function which gets called to get the address of a so far unresolved function and jump to it. The profiling extension of the dynamic linker allows @@ -111,6 +112,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], GL(dl_profile_map) = l; } else +#endif { /* This function will get called to fix up the GOT entry indicated by the offset on the stack, and then jump to diff --git a/sysdeps/x86_64/dl-trampoline.S b/sysdeps/x86_64/dl-trampoline.S index a6b9a1826b..3fd30d58fc 100644 --- a/sysdeps/x86_64/dl-trampoline.S +++ b/sysdeps/x86_64/dl-trampoline.S @@ -53,45 +53,49 @@ #define RESTORE_AVX -#define VEC_SIZE 64 -#define VMOVA vmovdqa64 -#define VEC(i) zmm##i -#define _dl_runtime_profile _dl_runtime_profile_avx512 -# define SECTION(p) p##.evex512 -#include "dl-trampoline.h" -#undef _dl_runtime_profile -#undef VEC -#undef VMOVA -#undef VEC_SIZE -#undef SECTION - -#if MINIMUM_X86_ISA_LEVEL <= AVX_X86_ISA_LEVEL -# define VEC_SIZE 32 -# define VMOVA vmovdqa -# define VEC(i) ymm##i -# define SECTION(p) p##.avx -# define _dl_runtime_profile _dl_runtime_profile_avx +#ifdef SHARED +# define VEC_SIZE 64 +# define VMOVA vmovdqa64 +# define VEC(i) zmm##i +# define _dl_runtime_profile _dl_runtime_profile_avx512 +# define SECTION(p) p##.evex512 # include "dl-trampoline.h" # undef _dl_runtime_profile # undef VEC # undef VMOVA # undef VEC_SIZE # undef SECTION -#endif -#if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL +# if MINIMUM_X86_ISA_LEVEL <= AVX_X86_ISA_LEVEL +# define VEC_SIZE 32 +# define VMOVA vmovdqa +# define VEC(i) ymm##i +# define SECTION(p) p##.avx +# define _dl_runtime_profile _dl_runtime_profile_avx +# include "dl-trampoline.h" +# undef _dl_runtime_profile +# undef VEC +# undef VMOVA +# undef VEC_SIZE +# undef SECTION +# endif + +# if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL /* movaps/movups is 1-byte shorter. */ -# define VEC_SIZE 16 -# define VMOVA movaps -# define VEC(i) xmm##i -# define _dl_runtime_profile _dl_runtime_profile_sse -# undef RESTORE_AVX -# include "dl-trampoline.h" -# undef _dl_runtime_profile -# undef VEC -# undef VMOVA -# undef VEC_SIZE +# define VEC_SIZE 16 +# define VMOVA movaps +# define VEC(i) xmm##i +# define _dl_runtime_profile _dl_runtime_profile_sse +# undef RESTORE_AVX +# include "dl-trampoline.h" +# undef _dl_runtime_profile +# undef VEC +# undef VMOVA +# undef VEC_SIZE +# endif +#endif /* SHARED */ +#if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL # define USE_FXSAVE # define STATE_SAVE_ALIGNMENT 16 # define _dl_runtime_resolve _dl_runtime_resolve_fxsave From patchwork Mon Nov 6 20:25:47 2023 Content-Type: text/plain; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:24 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 14/19] elf: Ignore loader debug env vars for setuid Date: Mon, 6 Nov 2023 17:25:47 -0300 Message-Id: <20231106202552.3404059-15-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Loader already ignores LD_DEBUG, LD_DEBUG_OUTPUT, and LD_TRACE_LOADED_OBJECTS. Both LD_WARN and LD_VERBOSE are similar to LD_DEBUG, in the sense they enable additional checks and debug information, so it makes sense to disable them. Checked on x86_64-linux-gnu. --- elf/rtld.c | 22 ++++++++++++++-------- elf/tst-env-setuid.c | 2 ++ 2 files changed, 16 insertions(+), 8 deletions(-) diff --git a/elf/rtld.c b/elf/rtld.c index a09cf2a9df..e7f90d37e7 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -2552,13 +2552,15 @@ process_envvars (struct dl_main_state *state) { case 4: /* Warning level, verbose or not. */ - if (memcmp (envline, "WARN", 4) == 0) + if (!__libc_enable_secure + && memcmp (envline, "WARN", 4) == 0) GLRO(dl_verbose) = envline[5] != '\0'; break; case 5: /* Debugging of the dynamic linker? */ - if (memcmp (envline, "DEBUG", 5) == 0) + if (!__libc_enable_secure + && memcmp (envline, "DEBUG", 5) == 0) { process_dl_debug (state, &envline[6]); break; @@ -2569,7 +2571,8 @@ process_envvars (struct dl_main_state *state) case 7: /* Print information about versions. */ - if (memcmp (envline, "VERBOSE", 7) == 0) + if (!__libc_enable_secure + && memcmp (envline, "VERBOSE", 7) == 0) { state->version_info = envline[8] != '\0'; break; @@ -2625,7 +2628,8 @@ process_envvars (struct dl_main_state *state) } /* Where to place the profiling data file. */ - if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) + if (!__libc_enable_secure + && memcmp (envline, "DEBUG_OUTPUT", 12) == 0) { debug_output = &envline[13]; break; @@ -2646,7 +2650,8 @@ process_envvars (struct dl_main_state *state) case 20: /* The mode of the dynamic linker can be set. */ - if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) + if (!__libc_enable_secure + && memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) { state->mode = rtld_mode_trace; state->mode_trace_program @@ -2668,9 +2673,10 @@ process_envvars (struct dl_main_state *state) } while (*nextp != '\0'); - GLRO(dl_debug_mask) = 0; - - if (state->mode != rtld_mode_normal) + if (GLRO(dl_debug_mask) != 0 + || GLRO(dl_verbose) != 0 + || state->mode != rtld_mode_normal + || state->version_info) _exit (5); } /* If we have to run the dynamic linker in debugging mode and the diff --git a/elf/tst-env-setuid.c b/elf/tst-env-setuid.c index 76b8e1fb45..dcf213a4cd 100644 --- a/elf/tst-env-setuid.c +++ b/elf/tst-env-setuid.c @@ -59,6 +59,8 @@ static const struct envvar_t filtered_envvars[] = { "MALLOC_TRACE", FILTERED_VALUE }, { "MALLOC_TRIM_THRESHOLD_", FILTERED_VALUE }, { "RES_OPTIONS", FILTERED_VALUE }, + { "LD_DEBUG", "all" }, + { "LD_DEBUG_OUTPUT", "/tmp/some-file" }, }; static const struct envvar_t unfiltered_envvars[] = From patchwork Mon Nov 6 20:25:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79245 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 661EA385841B for ; Mon, 6 Nov 2023 20:28:52 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x112e.google.com (mail-yw1-x112e.google.com [IPv6:2607:f8b0:4864:20::112e]) by sourceware.org (Postfix) with ESMTPS id 63CB53856275 for ; Mon, 6 Nov 2023 20:26:29 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 63CB53856275 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; 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Reviewed-by: Siddhesh Poyarekar --- elf/dl-main.h | 3 --- elf/rtld.c | 4 +--- 2 files changed, 1 insertion(+), 6 deletions(-) diff --git a/elf/dl-main.h b/elf/dl-main.h index 92766d06b4..f876904cb6 100644 --- a/elf/dl-main.h +++ b/elf/dl-main.h @@ -97,9 +97,6 @@ struct dl_main_state /* True if program should be also printed for rtld_mode_trace. */ bool mode_trace_program; - /* True if any of the debugging options is enabled. */ - bool any_debug; - /* True if information about versions has to be printed. */ bool version_info; }; diff --git a/elf/rtld.c b/elf/rtld.c index e7f90d37e7..638b019670 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -300,7 +300,6 @@ dl_main_state_init (struct dl_main_state *state) state->glibc_hwcaps_prepend = NULL; state->glibc_hwcaps_mask = NULL; state->mode = rtld_mode_normal; - state->any_debug = false; state->version_info = false; } @@ -2481,7 +2480,6 @@ process_dl_debug (struct dl_main_state *state, const char *dl_debug) && memcmp (dl_debug, debopts[cnt].name, len) == 0) { GLRO(dl_debug_mask) |= debopts[cnt].mask; - state->any_debug = true; break; } @@ -2682,7 +2680,7 @@ process_envvars (struct dl_main_state *state) /* If we have to run the dynamic linker in debugging mode and the LD_DEBUG_OUTPUT environment variable is given, we write the debug messages to this file. */ - else if (state->any_debug && debug_output != NULL) + else if (GLRO(dl_debug_mask) != 0 && debug_output != NULL) { const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; size_t name_len = strlen (debug_output); From patchwork Mon Nov 6 20:25:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79239 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 907D4385773F for ; Mon, 6 Nov 2023 20:27:37 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x1130.google.com (mail-yw1-x1130.google.com [IPv6:2607:f8b0:4864:20::1130]) by sourceware.org (Postfix) with ESMTPS id 0BD9C385E00F for ; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:29 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 16/19] elf: Ignore LD_LIBRARY_PATH and debug env var for setuid for static Date: Mon, 6 Nov 2023 17:25:49 -0300 Message-Id: <20231106202552.3404059-17-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org It mimics the ld.so behavior. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/dl-support.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/elf/dl-support.c b/elf/dl-support.c index 31a608df87..837fa1c836 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -272,8 +272,6 @@ _dl_non_dynamic_init (void) _dl_main_map.l_phdr = GL(dl_phdr); _dl_main_map.l_phnum = GL(dl_phnum); - _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1; - /* Set up the data structures for the system-supplied DSO early, so they can influence _dl_init_paths. */ setup_vdso (NULL, NULL); @@ -281,6 +279,22 @@ _dl_non_dynamic_init (void) /* With vDSO setup we can initialize the function pointers. */ setup_vdso_pointers (); + if (__libc_enable_secure) + { + static const char unsecure_envvars[] = + UNSECURE_ENVVARS + ; + const char *cp = unsecure_envvars; + + while (cp < unsecure_envvars + sizeof (unsecure_envvars)) + { + __unsetenv (cp); + cp = strchr (cp, '\0') + 1; + } + } + + _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1; + /* Initialize the data structures for the search paths for shared objects. */ _dl_init_paths (getenv ("LD_LIBRARY_PATH"), "LD_LIBRARY_PATH", @@ -297,20 +311,6 @@ _dl_non_dynamic_init (void) _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0'; - if (__libc_enable_secure) - { - static const char unsecure_envvars[] = - UNSECURE_ENVVARS - ; - const char *cp = unsecure_envvars; - - while (cp < unsecure_envvars + sizeof (unsecure_envvars)) - { - __unsetenv (cp); - cp = strchr (cp, '\0') + 1; - } - } - #ifdef DL_PLATFORM_INIT DL_PLATFORM_INIT; #endif From patchwork Mon Nov 6 20:25:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79246 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 3964C3858C30 for ; Mon, 6 Nov 2023 20:29:14 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x1131.google.com (mail-yw1-x1131.google.com [IPv6:2607:f8b0:4864:20::1131]) by sourceware.org (Postfix) with ESMTPS id A5934385C6D9 for ; Mon, 6 Nov 2023 20:26:32 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org A5934385C6D9 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org ARC-Filter: OpenARC Filter v1.0.0 sourceware.org A5934385C6D9 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::1131 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302393; cv=none; b=PGjqEi0xoapIUgx2Y41spu/wu3YrwwL4fI6JD4dyBBQLDf0nBWLusObqbmYVKGZ3/V0wwTq1nfmRTLyEry+ivRMiqtYWRPQ55nh8nhFe5y0TyhntGY1cEZXghv3ySQ8p2Ql8mSSbpQ+o+rXg3n/4LnKCmch5dOU/jGLELhOem5Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302393; c=relaxed/simple; bh=/3iDbWL0avDsXsgFNiaY6lZ2ByTk72AEBZhGw6Ueh6s=; h=DKIM-Signature:From:To:Subject:Date:Message-Id:MIME-Version; b=R0TgRIu1tbDcnl+S/w2uNUBymVtnxfrlcrCYcgZLOmE+bBOUJpClB8DVkyifJnBJdhRiKmkh2+dfSDSrae74ChaCnqjHnptxrMESxn9fxMgFIf3/htIh49vYFpr4p1aexqXxBMWh8tE7sKA5gNYPZMtjPrnVzKOUXRqZCWy5vII= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yw1-x1131.google.com with SMTP id 00721157ae682-5a8ee23f043so57452397b3.3 for ; Mon, 06 Nov 2023 12:26:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699302391; x=1699907191; darn=sourceware.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=lUVZmPWCaupkr5iho7XjQO9yTRSH4OXj4LD5UbLk+bM=; b=q7ic+d5SYWKDFQzMpHAUy5NET/Q8Lob9P9rNZNiA+Hx8ploKy6DApJN6On5Et+tFln VuBU1T2Z2cG8fu03QiaWwVV/r/kOLhwPdix8h5MG8qBfIS810Mo2ptzkbZLm9tjKmte1 TDowUUc5yMiAKKQgeM+F7r1ssrA6V7u2/HHM++fJAddlfKV2Jt1P0QiavobhRVL9wu5M AaGGKQasTW/neg4lODeBPiIFwjcqaCKTEiZgomkbPKLyJFYVD0FOxfni0U4WLlEtNk5J PAzA59KfHaUAl9W/R2xIIu4VVFHVBU4FCLTUMtckvJggpZ510FYT4bUSbsU8XLlxw8VO Uplg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699302391; x=1699907191; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=lUVZmPWCaupkr5iho7XjQO9yTRSH4OXj4LD5UbLk+bM=; b=BqA4HVsGKl4rBXfRZLJZXxBI0WssqNAwL6ohUCjgMPT+t5xIQj8bgFKBvI7jXTAzB8 7pa7DsS/jDGtfWpPuazDp0vUPVAMc7SLnhb4BW4UYfP0tNjwqNLsQOoRkRJ136n7Th3B Hox8/+50mAtKltB369Bx4ajXNVAxHooV+uraRW7ZOm3eLB6vZ6ZZJ8Vq10pFM9PrS6hi 726LyCqVJgiwnNQJivsRxyLvbksTBkky+Ae7QgWUF/0yMS/fPPtFvtXL8+Ewd4ZU4ZMH byZ1bf/OJ7Vee7silcgT4L/vegNJJOtltGRJQ8uGwxibaF2DDjWC8LiF/cfUcj9Hle+V JEkQ== X-Gm-Message-State: AOJu0YxagBo5By/po/3IEvFIozPuRhp28nCCt2sR0wWdbGW9sqACXKiY KX/iXH/PtcB4isWwTl2aARDsqyphDO6Ldcuq53ti2A== X-Google-Smtp-Source: AGHT+IH/2TSNaKbeem8/w8l8ag+Isx/s/05/OU6Vz9m0IQjbJYRfgoqSkos+MSJy+V2jwlmvLKx/UA== X-Received: by 2002:a81:4910:0:b0:5a8:6286:bee with SMTP id w16-20020a814910000000b005a862860beemr12225372ywa.4.1699302391656; Mon, 06 Nov 2023 12:26:31 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:31 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 17/19] elf: Add comments on how LD_AUDIT and LD_PRELOAD handle __libc_enable_secure Date: Mon, 6 Nov 2023 17:25:50 -0300 Message-Id: <20231106202552.3404059-18-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-13.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org To make explicit why __libc_enable_secure is not checked. Reviewed-by: Siddhesh Poyarekar --- elf/rtld.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/elf/rtld.c b/elf/rtld.c index 638b019670..d1017ba9e9 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -2563,6 +2563,10 @@ process_envvars (struct dl_main_state *state) process_dl_debug (state, &envline[6]); break; } + /* For __libc_enable_secure mode, audit pathnames containing slashes + are ignored. Also, shared audit objects are only loaded only from + the standard search directories and only if they have set-user-ID + mode bit enabled. */ if (memcmp (envline, "AUDIT", 5) == 0) audit_list_add_string (&state->audit_list, &envline[6]); break; @@ -2576,7 +2580,10 @@ process_envvars (struct dl_main_state *state) break; } - /* List of objects to be preloaded. */ + /* For __libc_enable_secure mode, preload pathnames containing slashes + are ignored. Also, shared objects are only preloaded from the + standard search directories and only if they have set-user-ID mode + bit enabled. */ if (memcmp (envline, "PRELOAD", 7) == 0) { state->preloadlist = &envline[8]; From patchwork Mon Nov 6 20:25:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79241 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 451C2385C6EE for ; Mon, 6 Nov 2023 20:27:49 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x1133.google.com (mail-yw1-x1133.google.com [IPv6:2607:f8b0:4864:20::1133]) by sourceware.org (Postfix) with ESMTPS id A11E73858023 for ; Mon, 6 Nov 2023 20:26:34 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org A11E73858023 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org ARC-Filter: OpenARC Filter v1.0.0 sourceware.org A11E73858023 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::1133 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302395; cv=none; b=EGtTPDNYxWTW6PktdGU6NuoWR0wV5hisXb1TG6xVI0XZ4YODVC2knw0bGNgV2Qo5ithPMC9p+gKWbXSPAn3+SnYgjODcnyvbEJnu2CBFAggLtnPPUu5gDW4bX9mkmwxXm5WnBNC4VdJ/YF5dChJ7Mwz3CW+6zyjY5NUARO1FkLk= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1699302395; c=relaxed/simple; bh=Rk1BxMlwimWl0kYqwXPVTuQKRCggvqczoUCnIMXiGsc=; h=DKIM-Signature:From:To:Subject:Date:Message-Id:MIME-Version; b=IouvMmReLBUF1TElewdcIZOZir+4EQOAeDkRSamSwP32U52zupazYlmIsnG18vJe8Mb2N3AIwe+uIzVsIzMt+QPvhEKXvrTmwCZvm0wrPPvTf51wwvraws4bzekrtxk1A7gK7v9yONXGluj9+Tn8sGD3MjoJJ/Eh8UNWMoxGgrU= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yw1-x1133.google.com with SMTP id 00721157ae682-5a7eef0b931so57909057b3.0 for ; Mon, 06 Nov 2023 12:26:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1699302393; x=1699907193; darn=sourceware.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=+4GDbFUmw1Mr9IXcIz740H4haKsPlYiuLewlNhU0zqc=; b=IAqSYtq2hbyNI8Ja8Hag/KWxeemQ4z5N39V+rJ9liN6e/Z3OHxan3OHxdXIbIbatR9 D0EospEKwuY4oqOU+0xYzreenRFt5MGgssVz8YnWSMFu3cBVykpdhcPDhNYqyOPN6vtF k/ohbS18mJ+t9ERbsH+gZ7BqqnErP4DJPkRsbyq8xpWN2h/KB0NrRZbz5wtnrQXs+2GG 3+J4NTilNv2BEb2JXQO/eE0ezjLiANCYdQ+M4StKTNyIy+jhnRUkJmLvZhWNhM8RlHOx /2yY2SfqK66jYWAjSBDXF9TMK4kNx9oNCRFPIYm/gnOD9/AsW+2v6sv8LZ7sRBYRH9bX 65eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699302393; x=1699907193; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+4GDbFUmw1Mr9IXcIz740H4haKsPlYiuLewlNhU0zqc=; b=vLU5XTC52ntxHUystjBLTLvrAlzMScDeKbGBSh3+ErLMWxanwJsmGyourEVoV450xd LOJr2Z0qmSdnGu+QlU42bNBSecb2WWRbXrHt+gbaEPkA/FITdyr0ChL6z0zJGiY+9xun uwrr0Jt3fQAopwEo+FyX8WB5y26kIxTRBasd9O63kKF6YlLvGDBfrh/P0fhblz8DHWrf SSXUnkvMOGoAREaMt7wpMbThZuD8VtdMQefYTlEbUOALBYoKL9wSQabKSCr3jCsLDcfR PfL0F/F5W6VBXMWpA6IP90aRhem/F9GFnqCd902gNkUfxoD/Urp0bhpYyId+OuKqmtAS zvig== X-Gm-Message-State: AOJu0YxIy/7tJvptQkRZ7/o/coeeWLDj2gE9LbiAfL0wnAXJBw3BwHGu BfVxDU6eTxiWrQGRD4iUTc4zRvMbl4EjePD8wbREjw== X-Google-Smtp-Source: AGHT+IEaJACnSIemBmNUte+e4sDTsTUEcJvGEmIMjY0hhimiDO7gAsZSIBHSJbdsUkERPvNRUyBnog== X-Received: by 2002:a81:a00a:0:b0:59b:fda7:9d7f with SMTP id x10-20020a81a00a000000b0059bfda79d7fmr12088615ywg.49.1699302393422; Mon, 06 Nov 2023 12:26:33 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:32 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 18/19] elf: Ignore LD_BIND_NOW and LD_BIND_NOT for setuid binaries Date: Mon, 6 Nov 2023 17:25:51 -0300 Message-Id: <20231106202552.3404059-19-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org To avoid any environment variable to change setuid binaries semantics. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/rtld.c | 8 ++++++-- elf/tst-env-setuid.c | 4 ++-- sysdeps/generic/unsecvars.h | 2 ++ 3 files changed, 10 insertions(+), 4 deletions(-) diff --git a/elf/rtld.c b/elf/rtld.c index d1017ba9e9..cfba30eba0 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -2598,12 +2598,14 @@ process_envvars (struct dl_main_state *state) case 8: /* Do we bind early? */ - if (memcmp (envline, "BIND_NOW", 8) == 0) + if (!__libc_enable_secure + && memcmp (envline, "BIND_NOW", 8) == 0) { GLRO(dl_lazy) = envline[9] == '\0'; break; } - if (memcmp (envline, "BIND_NOT", 8) == 0) + if (! __libc_enable_secure + && memcmp (envline, "BIND_NOT", 8) == 0) GLRO(dl_bind_not) = envline[9] != '\0'; break; @@ -2680,6 +2682,8 @@ process_envvars (struct dl_main_state *state) if (GLRO(dl_debug_mask) != 0 || GLRO(dl_verbose) != 0 + || GLRO(dl_lazy) != 1 + || GLRO(dl_bind_not) != 0 || state->mode != rtld_mode_normal || state->version_info) _exit (5); diff --git a/elf/tst-env-setuid.c b/elf/tst-env-setuid.c index dcf213a4cd..eb9613d717 100644 --- a/elf/tst-env-setuid.c +++ b/elf/tst-env-setuid.c @@ -61,12 +61,12 @@ static const struct envvar_t filtered_envvars[] = { "RES_OPTIONS", FILTERED_VALUE }, { "LD_DEBUG", "all" }, { "LD_DEBUG_OUTPUT", "/tmp/some-file" }, + { "LD_BIND_NOW", "0" }, + { "LD_BIND_NOT", "1" }, }; static const struct envvar_t unfiltered_envvars[] = { - { "LD_BIND_NOW", "0" }, - { "LD_BIND_NOT", "1" }, /* Non longer supported option. */ { "LD_ASSUME_KERNEL", UNFILTERED_VALUE }, }; diff --git a/sysdeps/generic/unsecvars.h b/sysdeps/generic/unsecvars.h index f7ebed60e5..c71b70ed95 100644 --- a/sysdeps/generic/unsecvars.h +++ b/sysdeps/generic/unsecvars.h @@ -7,6 +7,8 @@ "GLIBC_TUNABLES\0" \ "HOSTALIASES\0" \ "LD_AUDIT\0" \ + "LD_BIND_NOT\0" \ + "LD_BIND_NOW\0" \ "LD_DEBUG\0" \ "LD_DEBUG_OUTPUT\0" \ "LD_DYNAMIC_WEAK\0" \ From patchwork Mon Nov 6 20:25:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 79243 X-Patchwork-Delegate: siddhesh@gotplt.org Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 62723385773F for ; Mon, 6 Nov 2023 20:28:11 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-yw1-x112e.google.com (mail-yw1-x112e.google.com [IPv6:2607:f8b0:4864:20::112e]) by sourceware.org (Postfix) with ESMTPS id 72DD03857BB3 for ; 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([2804:1b3:a7c0:a715:c1a0:7281:6384:2ee9]) by smtp.gmail.com with ESMTPSA id ci7-20020a05690c0a8700b005a7b8fddfedsm4707154ywb.41.2023.11.06.12.26.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Nov 2023 12:26:34 -0800 (PST) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Siddhesh Poyarekar Subject: [PATCH v3 19/19] elf: Refactor process_envvars Date: Mon, 6 Nov 2023 17:25:52 -0300 Message-Id: <20231106202552.3404059-20-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> References: <20231106202552.3404059-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-13.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org It splits between process_envvars_secure and process_envvars_default, with the former used to process arguments for __libc_enable_secure. It does not have any semantic change, just simplify the code so there is no need to handle __libc_enable_secure on each len switch. Checked on x86_64-linux-gnu and aarch64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- elf/rtld.c | 132 ++++++++++++++++++++++++++++++++++------------------- 1 file changed, 84 insertions(+), 48 deletions(-) diff --git a/elf/rtld.c b/elf/rtld.c index cfba30eba0..95dcd32185 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -2527,7 +2527,67 @@ a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); } static void -process_envvars (struct dl_main_state *state) +process_envvars_secure (struct dl_main_state *state) +{ + char **runp = _environ; + char *envline; + + while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) + { + size_t len = 0; + + while (envline[len] != '\0' && envline[len] != '=') + ++len; + + if (envline[len] != '=') + /* This is a "LD_" variable at the end of the string without + a '=' character. Ignore it since otherwise we will access + invalid memory below. */ + continue; + + switch (len) + { + case 5: + /* For __libc_enable_secure mode, audit pathnames containing slashes + are ignored. Also, shared audit objects are only loaded only from + the standard search directories and only if they have set-user-ID + mode bit enabled. */ + if (memcmp (envline, "AUDIT", 5) == 0) + audit_list_add_string (&state->audit_list, &envline[6]); + break; + + case 7: + /* For __libc_enable_secure mode, preload pathnames containing slashes + are ignored. Also, shared objects are only preloaded from the + standard search directories and only if they have set-user-ID mode + bit enabled. */ + if (memcmp (envline, "PRELOAD", 7) == 0) + state->preloadlist = &envline[8]; + break; + } + } + + /* Extra security for SUID binaries. Remove all dangerous environment + variables. */ + const char *nextp = UNSECURE_ENVVARS; + do + { + unsetenv (nextp); + nextp = strchr (nextp, '\0') + 1; + } + while (*nextp != '\0'); + + if (GLRO(dl_debug_mask) != 0 + || GLRO(dl_verbose) != 0 + || GLRO(dl_lazy) != 1 + || GLRO(dl_bind_not) != 0 + || state->mode != rtld_mode_normal + || state->version_info) + _exit (5); +} + +static void +process_envvars_default (struct dl_main_state *state) { char **runp = _environ; char *envline; @@ -2550,15 +2610,13 @@ process_envvars (struct dl_main_state *state) { case 4: /* Warning level, verbose or not. */ - if (!__libc_enable_secure - && memcmp (envline, "WARN", 4) == 0) + if (memcmp (envline, "WARN", 4) == 0) GLRO(dl_verbose) = envline[5] != '\0'; break; case 5: /* Debugging of the dynamic linker? */ - if (!__libc_enable_secure - && memcmp (envline, "DEBUG", 5) == 0) + if (memcmp (envline, "DEBUG", 5) == 0) { process_dl_debug (state, &envline[6]); break; @@ -2573,8 +2631,7 @@ process_envvars (struct dl_main_state *state) case 7: /* Print information about versions. */ - if (!__libc_enable_secure - && memcmp (envline, "VERBOSE", 7) == 0) + if (memcmp (envline, "VERBOSE", 7) == 0) { state->version_info = envline[8] != '\0'; break; @@ -2591,43 +2648,37 @@ process_envvars (struct dl_main_state *state) } /* Which shared object shall be profiled. */ - if (!__libc_enable_secure - && memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') + if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') GLRO(dl_profile) = &envline[8]; break; case 8: /* Do we bind early? */ - if (!__libc_enable_secure - && memcmp (envline, "BIND_NOW", 8) == 0) + if (memcmp (envline, "BIND_NOW", 8) == 0) { GLRO(dl_lazy) = envline[9] == '\0'; break; } - if (! __libc_enable_secure - && memcmp (envline, "BIND_NOT", 8) == 0) + if (memcmp (envline, "BIND_NOT", 8) == 0) GLRO(dl_bind_not) = envline[9] != '\0'; break; case 9: /* Test whether we want to see the content of the auxiliary array passed up from the kernel. */ - if (!__libc_enable_secure - && memcmp (envline, "SHOW_AUXV", 9) == 0) + if (memcmp (envline, "SHOW_AUXV", 9) == 0) _dl_show_auxv (); break; case 11: /* Path where the binary is found. */ - if (!__libc_enable_secure - && memcmp (envline, "ORIGIN_PATH", 11) == 0) + if (memcmp (envline, "ORIGIN_PATH", 11) == 0) GLRO(dl_origin_path) = &envline[12]; break; case 12: /* The library search path. */ - if (!__libc_enable_secure - && memcmp (envline, "LIBRARY_PATH", 12) == 0) + if (memcmp (envline, "LIBRARY_PATH", 12) == 0) { state->library_path = &envline[13]; state->library_path_source = "LD_LIBRARY_PATH"; @@ -2635,30 +2686,26 @@ process_envvars (struct dl_main_state *state) } /* Where to place the profiling data file. */ - if (!__libc_enable_secure - && memcmp (envline, "DEBUG_OUTPUT", 12) == 0) + if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) { debug_output = &envline[13]; break; } - if (!__libc_enable_secure - && memcmp (envline, "DYNAMIC_WEAK", 12) == 0) + if (memcmp (envline, "DYNAMIC_WEAK", 12) == 0) GLRO(dl_dynamic_weak) = 1; break; case 14: /* Where to place the profiling data file. */ - if (!__libc_enable_secure - && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 + if (memcmp (envline, "PROFILE_OUTPUT", 14) == 0 && envline[15] != '\0') GLRO(dl_profile_output) = &envline[15]; break; case 20: /* The mode of the dynamic linker can be set. */ - if (!__libc_enable_secure - && memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) + if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) { state->mode = rtld_mode_trace; state->mode_trace_program @@ -2668,30 +2715,10 @@ process_envvars (struct dl_main_state *state) } } - /* Extra security for SUID binaries. Remove all dangerous environment - variables. */ - if (__glibc_unlikely (__libc_enable_secure)) - { - const char *nextp = UNSECURE_ENVVARS; - do - { - unsetenv (nextp); - nextp = strchr (nextp, '\0') + 1; - } - while (*nextp != '\0'); - - if (GLRO(dl_debug_mask) != 0 - || GLRO(dl_verbose) != 0 - || GLRO(dl_lazy) != 1 - || GLRO(dl_bind_not) != 0 - || state->mode != rtld_mode_normal - || state->version_info) - _exit (5); - } /* If we have to run the dynamic linker in debugging mode and the LD_DEBUG_OUTPUT environment variable is given, we write the debug messages to this file. */ - else if (GLRO(dl_debug_mask) != 0 && debug_output != NULL) + if (GLRO(dl_debug_mask) != 0 && debug_output != NULL) { const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; size_t name_len = strlen (debug_output); @@ -2710,6 +2737,15 @@ process_envvars (struct dl_main_state *state) } } +static void +process_envvars (struct dl_main_state *state) +{ + if (__glibc_unlikely (__libc_enable_secure)) + process_envvars_secure (state); + else + process_envvars_default (state); +} + #if HP_TIMING_INLINE static void print_statistics_item (const char *title, hp_timing_t time,