From patchwork Mon Dec 21 21:50:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 41506 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 4535838708B9; Mon, 21 Dec 2020 21:50:38 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4535838708B9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1608587438; bh=tQ9NDEOsDhtQTEktg8Lac4e8OmgQ43f8MgGWj1KANZk=; h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:From; b=MGzdCQxE8LTAPdUSbqmRgqxSkVDVRho57hZemmt3S4iCuLqr6v3vwpRvnIVzlr0R5 VJ/5aN1q967myeBTpzx2b81ZVy6DsUpcDE3VP2+yPjhZ9oiNbv5rCL26wupVA8EEK0 PhUWuB1JlBH+WutKJRDboRfgTiL4gsb5e8Vyr4/w= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x731.google.com (mail-qk1-x731.google.com [IPv6:2607:f8b0:4864:20::731]) by sourceware.org (Postfix) with ESMTPS id 9913A385043E for ; Mon, 21 Dec 2020 21:50:33 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 9913A385043E Received: by mail-qk1-x731.google.com with SMTP id v126so5717445qkd.11 for ; Mon, 21 Dec 2020 13:50:33 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=tQ9NDEOsDhtQTEktg8Lac4e8OmgQ43f8MgGWj1KANZk=; b=PwNUQLGqVJ+kZifyd95eHghxdBsRB5Uh8rtD7ua5XFdVtjwlzL0q7wbzFykbwYkiEQ 3ncBFAPdVPkU3L6pYbghuruzzkeQxiNVAKlaet7jr+/rVApoX7uEj9CojcOj1UR0EQz3 tDIWQfTjbdCYYqvZlkifW1p1Rf7eUcm0ouXN7teZ3UL/LFwfRkZR6sGH4Bg38oegHjUB SK/ZuAdntVve8dvxtpfM3yq68vPLkxEl90/b6Ttw1ckfUbgOX/CN/SHA+ROxwdU5BGUM ZfxcRLCDJ3FpKpAq0a+4/TZPRU1VO4xkb5N1AqdoIXwFrI6ZpP+eAthSw4w/wK6qGL+m bIKA== X-Gm-Message-State: AOAM531djeKwybD97a9kVO94Qs68w4CYalKuKW0QcMxNTBFuesOm/koJ 9gMZbqd0aMfFGV7Gs25/eh4PEqwUa/5MKA== X-Google-Smtp-Source: ABdhPJwPGT5zafNhakDJOojUG3PMFlAaZJofQbYvWdoGnoijgqGBBQkFjtLwsV2sqsGm7tUdYgC0Ig== X-Received: by 2002:a05:620a:15a:: with SMTP id e26mr18961522qkn.28.1608587432256; Mon, 21 Dec 2020 13:50:32 -0800 (PST) Received: from localhost.localdomain ([177.194.48.209]) by smtp.googlemail.com with ESMTPSA id q37sm11325803qte.10.2020.12.21.13.50.30 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Dec 2020 13:50:31 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH 1/3] Linux: Add close_range Date: Mon, 21 Dec 2020 18:50:25 -0300 Message-Id: <20201221215027.2176966-1-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.25.1 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, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" It was added on Linux 5.9 (278a5fbaed89). Although FreeBSD has added the same syscall, this only adds the symbol on Linux ports. This syscall is required to provided a fail-safe way to implement the closefrom symbol (BZ #10353). Similar to close, this is marked as a cancellation entrypoint. The tst-close_range-consts.py requires a toolchain with an updated kernel headers that provides the close_range.h UAPI kernel header. Checked on x86_64-linux-gnu on kernel v5.9 and v5.4. --- NEWS | 2 + include/bits/unistd_ext.h | 6 + sysdeps/unix/sysv/linux/Makefile | 13 +- sysdeps/unix/sysv/linux/Versions | 3 + sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 + sysdeps/unix/sysv/linux/arc/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 + sysdeps/unix/sysv/linux/bits/unistd_ext.h | 11 ++ sysdeps/unix/sysv/linux/close_range.c | 28 +++ sysdeps/unix/sysv/linux/csky/libc.abilist | 1 + sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 + sysdeps/unix/sysv/linux/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 + .../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 + .../sysv/linux/microblaze/be/libc.abilist | 1 + .../sysv/linux/mips/mips32/fpu/libc.abilist | 1 + .../sysv/linux/mips/mips64/n32/libc.abilist | 1 + .../sysv/linux/mips/mips64/n64/libc.abilist | 1 + sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 + .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 + .../linux/powerpc/powerpc64/be/libc.abilist | 1 + .../linux/powerpc/powerpc64/le/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv32/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv64/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 + .../sysv/linux/sparc/sparc32/libc.abilist | 1 + .../sysv/linux/sparc/sparc64/libc.abilist | 1 + sysdeps/unix/sysv/linux/tst-clone.h | 48 +++++ .../unix/sysv/linux/tst-close_range-consts.py | 49 +++++ sysdeps/unix/sysv/linux/tst-close_range.c | 175 ++++++++++++++++++ .../unix/sysv/linux/x86_64/64/libc.abilist | 1 + .../unix/sysv/linux/x86_64/x32/libc.abilist | 1 + 35 files changed, 359 insertions(+), 2 deletions(-) create mode 100644 include/bits/unistd_ext.h create mode 100644 sysdeps/unix/sysv/linux/close_range.c create mode 100644 sysdeps/unix/sysv/linux/tst-clone.h create mode 100644 sysdeps/unix/sysv/linux/tst-close_range-consts.py create mode 100644 sysdeps/unix/sysv/linux/tst-close_range.c diff --git a/NEWS b/NEWS index 0820984547..9e829841f6 100644 --- a/NEWS +++ b/NEWS @@ -28,6 +28,8 @@ Major new features: The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils 2.28. +* On Linux, the close_range function has been added. + Deprecated and removed features, and other changes affecting compatibility: * The mallinfo function is marked deprecated. Callers should call diff --git a/include/bits/unistd_ext.h b/include/bits/unistd_ext.h new file mode 100644 index 0000000000..277be05746 --- /dev/null +++ b/include/bits/unistd_ext.h @@ -0,0 +1,6 @@ +#include_next + +#ifndef _ISOMAC +extern int __close_range (unsigned int lowfd, unsigned int highfd, int flags); +libc_hidden_proto (__close_range); +#endif diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 09604e128b..e06c2a1f0d 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -61,7 +61,7 @@ sysdep_routines += adjtimex clone umount umount2 readahead sysctl \ open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \ timerfd_gettime timerfd_settime prctl \ process_vm_readv process_vm_writev clock_adjtime \ - time64-support pselect32 + time64-support pselect32 close_range CFLAGS-gethostid.c = -fexceptions CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables @@ -103,7 +103,8 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \ tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \ test-errno-linux tst-memfd_create tst-mlock2 tst-pkey \ tst-rlimit-infinity tst-ofdlocks tst-gettid tst-gettid-kill \ - tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux + tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux \ + tst-close_range tests-internal += tst-ofdlocks-compat tst-sigcontext-get_pc CFLAGS-tst-sigcontext-get_pc.c = -fasynchronous-unwind-tables @@ -177,6 +178,14 @@ $(objpfx)tst-mman-consts.out: ../sysdeps/unix/sysv/linux/tst-mman-consts.py < /dev/null > $@ 2>&1; $(evaluate-test) $(objpfx)tst-mman-consts.out: $(sysdeps-linux-python-deps) +tests-special += $(objpfx)tst-close_range-consts.out +$(objpfx)tst-close_range-consts.out: ../sysdeps/unix/sysv/linux/tst-close_range-consts.py + $(sysdeps-linux-python) \ + ../sysdeps/unix/sysv/linux/tst-close_range-consts.py \ + $(sysdeps-linux-python-cc) \ + < /dev/null > $@ 2>&1; $(evaluate-test) +$(objpfx)tst-close_range-consts.out: $(sysdeps-linux-python-deps) + $(objpfx)tst-gettid: $(shared-thread-library) $(objpfx)tst-gettid-kill: $(shared-thread-library) $(objpfx)tst-tgkill: $(shared-thread-library) diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index c35f783e2a..e2a6fa763f 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -169,6 +169,9 @@ libc { } GLIBC_2.32 { } + GLIBC_2.33 { + close_range; + } GLIBC_PRIVATE { # functions used in other libraries __syscall_rt_sigqueueinfo; diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index 4cc1c6a591..a52decb822 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2160,6 +2160,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index 26ad9845e4..ed085c9b3c 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -2242,6 +2242,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index bb9dfd4daf..88a17c2fdf 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -1920,6 +1920,7 @@ GLIBC_2.32 wprintf F GLIBC_2.32 write F GLIBC_2.32 writev F GLIBC_2.32 wscanf F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index 9ab3924888..a690962068 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -141,6 +141,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/bits/unistd_ext.h b/sysdeps/unix/sysv/linux/bits/unistd_ext.h index c315cc5cb8..799c59512c 100644 --- a/sysdeps/unix/sysv/linux/bits/unistd_ext.h +++ b/sysdeps/unix/sysv/linux/bits/unistd_ext.h @@ -33,4 +33,15 @@ not detached and has not been joined. */ extern __pid_t gettid (void) __THROW; +/* Unshare the file descriptor table before closing file descriptors. */ +#define CLOSE_RANGE_UNSHARE (1U << 1) + +/* Close all file descriptors in the range FD up to MAX_FD. The flag FLAGS + are define by the CLOSE_RANGE prefix. This function behaves like close + on the range, but in a fail-safe where it will either fail and not close + any file descriptor or close all of them. Returns 0 on successor or -1 + for failure (and sets errno accordingly). */ +extern int close_range (unsigned int __fd, unsigned int __max_fd, + int __flags) __THROW; + #endif diff --git a/sysdeps/unix/sysv/linux/close_range.c b/sysdeps/unix/sysv/linux/close_range.c new file mode 100644 index 0000000000..a664e158ee --- /dev/null +++ b/sysdeps/unix/sysv/linux/close_range.c @@ -0,0 +1,28 @@ +/* Close a range of file descriptors. + Copyright (C) 2020 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 + +int +__close_range (unsigned int lowfd, unsigned int highfd, int flags) +{ + return SYSCALL_CANCEL (close_range, lowfd, highfd, flags); +} +libc_hidden_def (__close_range) +weak_alias (__close_range, close_range) diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist index 14a84dac8f..d37882413c 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2104,6 +2104,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 5c8502f3d3..61450e47d5 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -2063,6 +2063,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index 4f0d3c1eb5..672ff8a002 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -2229,6 +2229,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist index e3b345b803..53e53005e9 100644 --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist @@ -2095,6 +2095,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index c4891479d3..cc0d93b381 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -2175,6 +2175,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index 143b0163b4..b4acf52c41 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2155,6 +2155,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index b2295f1937..fadbf99d4b 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -2146,6 +2146,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index aa9c6a4dca..c456ebcea3 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -2152,6 +2152,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 5939588ad5..5ed54e7c94 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -2146,6 +2146,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index 92556c4237..67b611ef6d 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2193,6 +2193,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index 26c93dff05..ed0f239cd5 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -2202,6 +2202,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index c2ca00709e..a4b9900036 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist @@ -2065,6 +2065,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index 0ea50dc851..e5d666dab3 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2355,6 +2355,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index 0263e284d4..f8c34aca7c 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -595,6 +595,7 @@ GLIBC_2.33 clock_nanosleep F GLIBC_2.33 clock_settime F GLIBC_2.33 clone F GLIBC_2.33 close F +GLIBC_2.33 close_range F GLIBC_2.33 closedir F GLIBC_2.33 closelog F GLIBC_2.33 confstr F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 1626c5351f..6042d42aba 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2122,6 +2122,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index a66426eb4d..46d2de3030 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -2200,6 +2200,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index ab351873ae..9fda4babba 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -2101,6 +2101,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index d36f228192..110f7ebf22 100644 --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist @@ -2067,6 +2067,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index 59b4313280..1b31685a24 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -2191,6 +2191,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index 266dcdfa08..9ad88bf7b3 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -2118,6 +2118,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/tst-clone.h b/sysdeps/unix/sysv/linux/tst-clone.h new file mode 100644 index 0000000000..2344ac5101 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-clone.h @@ -0,0 +1,48 @@ +/* Auxiliary wrapper to issue the clone symbol. + Copyright (C) 2020 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 _TST_CLONE_H +#define _TST_CLONE_H + +#include +#include /* For _STACK_GROWS_{UP,DOWN}. */ + +#define DEFINE_STACK(name, size) \ + char name[size] __attribute__ ((aligned)) + +static inline pid_t +clone_call (int (*fn) (void *arg), void *arg, void *stack, size_t stack_size, + int flags) +{ +#ifdef __ia64__ + extern int __clone2 (int (*fn) (void *arg), void *stack, size_t stack_size, + int flags, void *arg, ...); + return __clone2 (f, stack, stack_size, flags, arg, /* ptid */ NULL, + /* tls */ NULL, /* ctid */ ctid); +#else +# if _STACK_GROWS_DOWN + return clone (fn, stack + stack_size, flags, arg, /* ptid */ NULL, + /* tls */ NULL, /* ctid */ NULL); +# elif _STACK_GROWS_UP + return clone (fn, stack, flags, arg, /* ptid */ NULL, /* tls */ NULL, + &ctid); +# endif +#endif +} + +#endif diff --git a/sysdeps/unix/sysv/linux/tst-close_range-consts.py b/sysdeps/unix/sysv/linux/tst-close_range-consts.py new file mode 100644 index 0000000000..3a0d4423e8 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-close_range-consts.py @@ -0,0 +1,49 @@ +#!/usr/bin/python3 +# Test that glibc's unistd_ext.h constants match the kernel's. +# Copyright (C) 2020 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 +# . + +import argparse +import sys + +import glibcextract +import glibcsyscalls + + +def main(): + """The main entry point.""" + parser = argparse.ArgumentParser( + description="Test that glibc's unistd_ext.h constants match " + "the kernel's.") + parser.add_argument('--cc', metavar='CC', + help='C compiler (including options) to use') + args = parser.parse_args() + linux_version_headers = glibcsyscalls.linux_kernel_version(args.cc) + linux_version_glibc = (5, 9) + sys.exit(glibcextract.compare_macro_consts( + '#define _GNU_SOURCE 1\n' + '#include \n', + '#define _GNU_SOURCE 1\n' + '#include \n', + args.cc, + 'CLOSE_RANGE_.*', + None, + linux_version_glibc > linux_version_headers, + linux_version_headers > linux_version_glibc)) + +if __name__ == '__main__': + main() diff --git a/sysdeps/unix/sysv/linux/tst-close_range.c b/sysdeps/unix/sysv/linux/tst-close_range.c new file mode 100644 index 0000000000..a685e7d359 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-close_range.c @@ -0,0 +1,175 @@ +/* Test for the close_range system call. + Copyright (C) 2020 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 +#include + +#include +#include + +static unsigned int +first_invalid_flag (void) +{ + static const unsigned int flags[] = { + CLOSE_RANGE_UNSHARE, + }; + + unsigned int r = 1; + for (int i = 0; i < array_length (flags); i++) + if ((1U << r) & flags[i]) + r++; + return 1U << r; +} + +enum +{ + maximum_fd = 100, + half_fd = maximum_fd / 2, + gap_1 = maximum_fd - 8, + gap_0 = (maximum_fd * 3) / 4 +}; + +static void +close_range_test_common (int *fds, unsigned int flags) +{ + /* Basic test for invalid flags, bail out if unsupported. */ + TEST_COMPARE (close_range (fds[0], fds[half_fd], first_invalid_flag()), -1); + if (errno == ENOSYS) + FAIL_UNSUPPORTED ("close_range not supported"); + TEST_COMPARE (errno, EINVAL); + + /* Close half of the descriptors and check result. */ + TEST_COMPARE (close_range (fds[0], fds[half_fd], flags), 0); + for (int i = 0; i <= half_fd; i++) + { + TEST_COMPARE (fcntl (fds[i], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); + } + for (int i = half_fd + 1; i < maximum_fd; i++) + TEST_VERIFY (fcntl (fds[i], F_GETFL) > -1); + + /* Create some gaps, close up to a threshold, and check result. */ + xclose (57); + xclose (78); + xclose (81); + xclose (82); + xclose (84); + xclose (90); + + TEST_COMPARE (close_range (fds[half_fd + 1], fds[gap_1], flags), 0); + for (int i = half_fd + 1; i < gap_1; i++) + { + TEST_COMPARE (fcntl (fds[i], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); + } + for (int i = gap_1 + 1; i < maximum_fd; i++) + TEST_VERIFY (fcntl (fds[i], F_GETFL) > -1); + + /* Close the remmaining but the last one. */ + TEST_COMPARE (close_range (fds[gap_1 + 1], fds[maximum_fd - 1], flags), 0); + for (int i = gap_1 + 1; i < maximum_fd - 1; i++) + { + TEST_COMPARE (fcntl (fds[i], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); + } + TEST_VERIFY (fcntl (fds[maximum_fd], F_GETFL) > -1); + + /* Close the last one. */ + TEST_COMPARE (close_range (fds[maximum_fd], fds[maximum_fd], flags), 0); + TEST_COMPARE (fcntl (fds[maximum_fd], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); +} + +/* Basic tests: check if the syscall close ranges with and without gaps. */ +static void +close_range_test (void) +{ + int fds[maximum_fd + 1]; + + struct support_descriptors *descrs = support_descriptors_list (); + + for (int i = 0; i < array_length (fds); i++) + fds[i] = xopen ("/dev/null", O_RDONLY | O_CLOEXEC, 0600); + + close_range_test_common (fds, 0); + + /* Double check by check the /proc. */ + support_descriptors_check (descrs); + support_descriptors_free (descrs); +} + +static int +close_range_unshare_test_fn (void *arg) +{ + close_range_test_common (arg, CLOSE_RANGE_UNSHARE); + exit (EXIT_SUCCESS); +} + +/* Check if a close_range with CLOSE_RANGE_UNSHARE issued from a subprocess + created with CLONE_FILES does not close the parent file descriptor list. */ +static void +close_range_unshare_test (void) +{ + int fds[maximum_fd + 1]; + + for (int i = 0; i < array_length (fds); i++) + fds[i] = xopen ("/dev/null", O_RDONLY | O_CLOEXEC, 0600); + + struct support_descriptors *descrs = support_descriptors_list (); + + enum { stack_size = 4096 }; + DEFINE_STACK (stack, stack_size); + pid_t pid = clone_call (close_range_unshare_test_fn, fds, stack, stack_size, + CLONE_FILES | SIGCHLD); + TEST_VERIFY_EXIT (pid > 0); + int status; + xwaitpid (pid, &status, 0); + TEST_VERIFY (WIFEXITED (status)); + TEST_COMPARE (WEXITSTATUS(status), 0); + + for (int i = 0; i < maximum_fd; i++) + TEST_VERIFY (fcntl (fds[i], F_GETFL) > -1); + + support_descriptors_check (descrs); + support_descriptors_free (descrs); + + TEST_COMPARE (close_range (fds[0], fds[maximum_fd], 0), 0); +} + +static int +do_test (void) +{ + close_range_test (); + close_range_unshare_test (); + + return 0; +} + +#include diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index 4fff61818b..5089a21981 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -2076,6 +2076,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index 102ed47a9c..c3db0fc7ca 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2173,6 +2173,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 close_range F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F From patchwork Mon Dec 21 21:50:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 41507 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 4DC8D38708C0; Mon, 21 Dec 2020 21:50:40 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4DC8D38708C0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1608587440; bh=yS25UBkrYd2usNb9vqaTBqjVecZbWdR4y3fsMdgQs3k=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=sWSCLXcn+OULoOlxRLIqlSBz6DdnmpkENdRf4FUwhFVZDPk4YZKmDxrTzjlatTaCN XUJpSEuI4jst+HFgOuYO1s9D92/RaGuBmiod/Yrksx3SA8IilU3SOSbG/tgBh65nVA iHiMnTkJlCd1TMXfdTe5EmGb937G8sNVCY3orn38= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qt1-x82b.google.com (mail-qt1-x82b.google.com [IPv6:2607:f8b0:4864:20::82b]) by sourceware.org (Postfix) with ESMTPS id 2D9D638708AC for ; 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Mon, 21 Dec 2020 13:50:33 -0800 (PST) Received: from localhost.localdomain ([177.194.48.209]) by smtp.googlemail.com with ESMTPSA id q37sm11325803qte.10.2020.12.21.13.50.32 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Dec 2020 13:50:33 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH 2/3] io: Add closefrom [BZ #10353] Date: Mon, 21 Dec 2020 18:50:26 -0300 Message-Id: <20201221215027.2176966-2-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201221215027.2176966-1-adhemerval.zanella@linaro.org> References: <20201221215027.2176966-1-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, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" The symbol closes all open file descriptors greater than or equal to input argument. Negative values are campled to 0, i.e, it will close all file descriptors. As indicated by the bug report, this is a common symbol provided by different systems (Solaris, OpenBSD, NetBSD, FreeBSD) and, although its has inherent issues with not taking in consideration internal libc file descriptors (such as syslog), this is also a common feature used in multiple projects [1][2][3][4][5]. The Linux fallback implementation iterates over /proc and close all file descriptors sequentially. Although it was raised the questioning whether getdents on /proc/self/fd might return disjointed entries when file descriptor are closed; it does not seems the case on my testing on multiple kernel (v4.18, v5.4, v5.9) and the same strategy is used on different projects [1][2][3][5]. Also, the interface is set a fail-safe meaning that a failure in the fallback results in a process abort. Checked on x86_64-linux-gnu on kernel v5.9 and v5.4. [1] https://github.com/systemd/systemd/blob/5238e9575906297608ff802a27e2ff9effa3b338/src/basic/fd-util.c#L217 [2] https://github.com/lxc/lxc/blob/ddf4b77e11a4d08f09b7b9cd13e593f8c047edc5/src/lxc/start.c#L236 [3] https://github.com/python/cpython/blob/9e4f2f3a6b8ee995c365e86d976937c141d867f8/Modules/_posixsubprocess.c#L220 [4] https://github.com/rust-lang/rust/blob/5f47c0613ed4eb46fca3633c1297364c09e5e451/src/libstd/sys/unix/process2.rs#L303-L308 [5] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82 --- NEWS | 4 + include/unistd.h | 1 + io/Makefile | 5 +- io/Versions | 1 + io/closefrom.c | 34 +++++++ io/tst-closefrom.c | 94 +++++++++++++++++++ posix/unistd.h | 8 ++ sysdeps/mach/hurd/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/Makefile | 2 +- sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 + sysdeps/unix/sysv/linux/arc/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 + sysdeps/unix/sysv/linux/closefrom.c | 35 +++++++ sysdeps/unix/sysv/linux/closefrom_fallback.c | 74 +++++++++++++++ sysdeps/unix/sysv/linux/csky/libc.abilist | 1 + sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 + sysdeps/unix/sysv/linux/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 + .../sysv/linux/m68k/coldfire/libc.abilist | 1 + .../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 + .../sysv/linux/microblaze/be/libc.abilist | 1 + .../sysv/linux/microblaze/le/libc.abilist | 1 + .../sysv/linux/mips/mips32/fpu/libc.abilist | 1 + .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 + .../sysv/linux/mips/mips64/n32/libc.abilist | 1 + .../sysv/linux/mips/mips64/n64/libc.abilist | 1 + sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 + .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 + .../powerpc/powerpc32/nofpu/libc.abilist | 1 + .../linux/powerpc/powerpc64/be/libc.abilist | 1 + .../linux/powerpc/powerpc64/le/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv32/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv64/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 + .../sysv/linux/sparc/sparc32/libc.abilist | 1 + .../sysv/linux/sparc/sparc64/libc.abilist | 1 + .../unix/sysv/linux/x86_64/64/libc.abilist | 1 + .../unix/sysv/linux/x86_64/x32/libc.abilist | 1 + 43 files changed, 288 insertions(+), 3 deletions(-) create mode 100644 io/closefrom.c create mode 100644 io/tst-closefrom.c create mode 100644 sysdeps/unix/sysv/linux/closefrom.c create mode 100644 sysdeps/unix/sysv/linux/closefrom_fallback.c diff --git a/NEWS b/NEWS index 9e829841f6..221eb4d98e 100644 --- a/NEWS +++ b/NEWS @@ -30,6 +30,10 @@ Major new features: * On Linux, the close_range function has been added. +* The function closefrom has been adeed. It closes all file descriptors + greater than given integer. This function is a GNU extension, although it + also present in other systems. + Deprecated and removed features, and other changes affecting compatibility: * The mallinfo function is marked deprecated. Callers should call diff --git a/include/unistd.h b/include/unistd.h index 54becbc9eb..d48ad6c799 100644 --- a/include/unistd.h +++ b/include/unistd.h @@ -153,6 +153,7 @@ extern int __brk (void *__addr) attribute_hidden; extern int __close (int __fd); libc_hidden_proto (__close) extern int __libc_close (int __fd); +extern _Bool __closefrom_fallback (int __lowfd) attribute_hidden; extern ssize_t __read (int __fd, void *__buf, size_t __nbytes); libc_hidden_proto (__read) extern ssize_t __write (int __fd, const void *__buf, size_t __n); diff --git a/io/Makefile b/io/Makefile index 33f5b0b867..56a788c2d5 100644 --- a/io/Makefile +++ b/io/Makefile @@ -55,7 +55,8 @@ routines := \ posix_fadvise posix_fadvise64 \ posix_fallocate posix_fallocate64 \ sendfile sendfile64 copy_file_range \ - utimensat futimens file_change_detection + utimensat futimens file_change_detection \ + closefrom others := pwd test-srcs := ftwtest @@ -69,7 +70,7 @@ tests := test-utime test-stat test-stat2 test-lfs tst-getcwd \ tst-fts tst-fts-lfs tst-open-tmpfile \ tst-copy_file_range tst-getcwd-abspath tst-lockf \ tst-ftw-lnk tst-file_change_detection tst-lchmod \ - tst-ftw-bz26353 + tst-ftw-bz26353 tst-closefrom # Likewise for statx, but we do not need static linking here. tests-internal += tst-statx diff --git a/io/Versions b/io/Versions index 49c4d2d40a..fa33452881 100644 --- a/io/Versions +++ b/io/Versions @@ -135,6 +135,7 @@ libc { GLIBC_2.33 { stat; stat64; fstat; fstat64; lstat; lstat64; fstatat; fstatat64; mknod; mknodat; + closefrom; } GLIBC_PRIVATE { __libc_fcntl64; diff --git a/io/closefrom.c b/io/closefrom.c new file mode 100644 index 0000000000..7e8f5a1ce5 --- /dev/null +++ b/io/closefrom.c @@ -0,0 +1,34 @@ +/* Close a range of file descriptors. + Copyright (C) 2020 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 + +void +__closefrom (int lowfd) +{ + int maxfd = __getdtablesize (); + if (maxfd == -1) + __fortify_fail ("closefrom failed to get the file descriptor table size"); + + for (int i = 0; i < maxfd; i++) + if (i >= lowfd) + if (__close (i) == -1) + __fortify_fail ("closefrom failed to close a file descriptor"); +} +weak_alias (__closefrom, closefrom) diff --git a/io/tst-closefrom.c b/io/tst-closefrom.c new file mode 100644 index 0000000000..6eb97cec10 --- /dev/null +++ b/io/tst-closefrom.c @@ -0,0 +1,94 @@ +/* Smoke test for the closefrom. + Copyright (C) 2020 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 + +static int +do_test (void) +{ + enum + { + maximum_fd = 100, + half_fd = maximum_fd / 2, + gap = maximum_fd / 4 + }; + + int fds[maximum_fd + 1]; + + struct support_descriptors *descrs = support_descriptors_list (); + + for (int i = 0; i < array_length (fds); i++) + fds[i] = xopen ("/dev/null", O_RDONLY | O_CLOEXEC, 0600); + + /* Close half of the descriptors and check result. */ + closefrom (fds[half_fd]); + + for (int i = half_fd; i <= maximum_fd; i++) + { + TEST_COMPARE (fcntl (fds[i], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); + } + for (int i = 0; i < half_fd; i++) + TEST_VERIFY (fcntl (fds[i], F_GETFL) > -1); + + /* Create some gaps, close up to a threshold, and check result. */ + xclose (35); + xclose (38); + xclose (42); + xclose (46); + + /* Close half of the descriptors and check result. */ + closefrom (fds[gap]); + for (int i = gap + 1; i < maximum_fd; i++) + { + TEST_COMPARE (fcntl (fds[i], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); + } + for (int i = 0; i < gap; i++) + TEST_VERIFY (fcntl (fds[i], F_GETFL) > -1); + + /* Close the remmaining but the last one. */ + closefrom (fds[1]); + for (int i = 1; i <= maximum_fd; i++) + { + TEST_COMPARE (fcntl (fds[i], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); + } + TEST_VERIFY (fcntl (fds[0], F_GETFL) > -1); + + /* Close the last one. */ + closefrom (fds[0]); + TEST_COMPARE (fcntl (fds[0], F_GETFL), -1); + TEST_COMPARE (errno, EBADF); + + /* Double check by check the /proc. */ + support_descriptors_check (descrs); + support_descriptors_free (descrs); + + return 0; +} + +#include diff --git a/posix/unistd.h b/posix/unistd.h index 32b8161619..43ddd516aa 100644 --- a/posix/unistd.h +++ b/posix/unistd.h @@ -352,6 +352,14 @@ extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) __THROW. */ extern int close (int __fd); +#ifdef __USE_GNU +/* Close all open file descriptors greater than or equal to LOWFD. + Negative LOWFD is clamped to 0. + + Similar to close, this functions is a cancellation point. */ +extern void closefrom (int __lowfd); +#endif + /* Read NBYTES into BUF from FD. Return the number read, -1 for errors or 0 for EOF. diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist index 7a5eb66b85..fce67cf3ca 100644 --- a/sysdeps/mach/hurd/i386/libc.abilist +++ b/sysdeps/mach/hurd/i386/libc.abilist @@ -2191,6 +2191,7 @@ GLIBC_2.32 thrd_current F GLIBC_2.32 thrd_equal F GLIBC_2.32 thrd_sleep F GLIBC_2.32 thrd_yield F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index e06c2a1f0d..59ee6b5b5a 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -61,7 +61,7 @@ sysdep_routines += adjtimex clone umount umount2 readahead sysctl \ open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \ timerfd_gettime timerfd_settime prctl \ process_vm_readv process_vm_writev clock_adjtime \ - time64-support pselect32 close_range + time64-support pselect32 close_range closefrom_fallback CFLAGS-gethostid.c = -fexceptions CFLAGS-tee.c = -fexceptions -fasynchronous-unwind-tables diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index a52decb822..811d3b3cd9 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2161,6 +2161,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index ed085c9b3c..d0bc011811 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -2243,6 +2243,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index 88a17c2fdf..c4e26b3cf6 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -1921,6 +1921,7 @@ GLIBC_2.32 write F GLIBC_2.32 writev F GLIBC_2.32 wscanf F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist index 3b0a47e967..5ccd1fb07f 100644 --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist @@ -144,6 +144,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index a690962068..5043e483b8 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -142,6 +142,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/closefrom.c b/sysdeps/unix/sysv/linux/closefrom.c new file mode 100644 index 0000000000..ba98fccd39 --- /dev/null +++ b/sysdeps/unix/sysv/linux/closefrom.c @@ -0,0 +1,35 @@ +/* Close a range of file descriptors. Linux version. + Copyright (C) 2020 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 + +void +__closefrom (int lowfd) +{ + int l = MAX (0, lowfd); + + int r = __close_range (l, ~0U, 0); + if (r == 0) + return; + + if (!__closefrom_fallback (l)) + __fortify_fail ("closefrom failed to close a file descriptor"); +} +weak_alias (__closefrom, closefrom) diff --git a/sysdeps/unix/sysv/linux/closefrom_fallback.c b/sysdeps/unix/sysv/linux/closefrom_fallback.c new file mode 100644 index 0000000000..48815941dd --- /dev/null +++ b/sysdeps/unix/sysv/linux/closefrom_fallback.c @@ -0,0 +1,74 @@ +/* Close a range of file descriptors. Linux version. + Copyright (C) 2020 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 + +/* Fallback code: iterates over /proc/self/fd, closing each file descriptor + that fall on the criteria. */ +_Bool +__closefrom_fallback (int from) +{ + int dirfd = __open_nocancel (FD_TO_FILENAME_PREFIX, O_RDONLY | O_DIRECTORY, + 0); + if (dirfd == -1) + return false; + + enum { buffer_size = 1024 }; + char buffer[buffer_size]; + bool ret = true; + + while (true) + { + ssize_t ret = __getdents64 (dirfd, buffer, sizeof (buffer)); + if (ret == -1) + goto err; + else if (ret == 0) + break; + + char *begin = buffer, *end = buffer + ret; + while (begin != end) + { + unsigned short int d_reclen; + memcpy (&d_reclen, begin + offsetof (struct dirent64, d_reclen), + sizeof (d_reclen)); + const char *dname = begin + offsetof (struct dirent64, d_name); + begin += d_reclen; + + if (dname[0] == '.') + continue; + + int fd = 0; + for (const char *s = dname; (unsigned int) (*s) - '0' < 10; s++) + fd = 10 * fd + (*s - '0'); + + if (fd == dirfd || fd < from) + continue; + + if (__close_nocancel (fd) < 0) + goto err; + } + } + + ret = true; +err: + __close_nocancel (dirfd); + return ret; +} diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist index d37882413c..6f3718cd14 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2105,6 +2105,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 61450e47d5..84b474dba4 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -2064,6 +2064,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index 672ff8a002..4c1399102e 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -2230,6 +2230,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist index 53e53005e9..9fcaa40c34 100644 --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist @@ -2096,6 +2096,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index 25f2d1c08f..ccb780d9c7 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -145,6 +145,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index cc0d93b381..3afaa1c70e 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -2176,6 +2176,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index b4acf52c41..266063d0e8 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2156,6 +2156,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist index 13d374a031..5d893ec4d1 100644 --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist @@ -2152,6 +2152,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index fadbf99d4b..6207a15a09 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -2147,6 +2147,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist index 4c786070d0..860e5fecfa 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist @@ -2144,6 +2144,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index c456ebcea3..daed5ae2a8 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -2153,6 +2153,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 5ed54e7c94..7b6edfe8f5 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -2147,6 +2147,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index 67b611ef6d..9dd7d64500 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2194,6 +2194,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index ed0f239cd5..c561e5cf36 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -2203,6 +2203,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index f04b167788..d25bf75ed3 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -2235,6 +2235,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index a4b9900036..248fab8212 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist @@ -2066,6 +2066,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index e5d666dab3..d02fa6b3d2 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2356,6 +2356,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index f8c34aca7c..56d1a16b2a 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -597,6 +597,7 @@ GLIBC_2.33 clone F GLIBC_2.33 close F GLIBC_2.33 close_range F GLIBC_2.33 closedir F +GLIBC_2.33 closefrom F GLIBC_2.33 closelog F GLIBC_2.33 confstr F GLIBC_2.33 connect F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 6042d42aba..8fcd329728 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2123,6 +2123,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index 46d2de3030..b06cc94710 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -2201,6 +2201,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index 9fda4babba..6ede1579ca 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -2102,6 +2102,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist index 22ceaa3d87..0f426028a1 100644 --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist @@ -2070,6 +2070,7 @@ GLIBC_2.32 sigabbrev_np F GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index 110f7ebf22..8637b683d6 100644 --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist @@ -2068,6 +2068,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index 1b31685a24..dc7c01f734 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -2192,6 +2192,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index 9ad88bf7b3..67d361c881 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -2119,6 +2119,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index 5089a21981..94bb5a0fa7 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -2077,6 +2077,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index c3db0fc7ca..e94ce733ab 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2174,6 +2174,7 @@ GLIBC_2.32 sigdescr_np F GLIBC_2.32 strerrordesc_np F GLIBC_2.32 strerrorname_np F GLIBC_2.33 close_range F +GLIBC_2.33 closefrom F GLIBC_2.33 fstat F GLIBC_2.33 fstat64 F GLIBC_2.33 fstatat F From patchwork Mon Dec 21 21:50:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 41508 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 47BBC38708BC; Mon, 21 Dec 2020 21:50:43 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 47BBC38708BC DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1608587443; bh=+lIk215r803G2wadyXaQg3quG0SwypsVwW/86O7AbAo=; 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libc-alpha@sourceware.org Subject: [PATCH 3/3] posix: Add posix_spawn_file_actions_closefrom Date: Mon, 21 Dec 2020 18:50:27 -0300 Message-Id: <20201221215027.2176966-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201221215027.2176966-1-adhemerval.zanella@linaro.org> References: <20201221215027.2176966-1-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, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" This patch adds a way to close a range of file descriptors on posix_spawn as a new file action. The API is similar to the one provided by Solaris 11 [1], where the file action causes the all open file descriptors greater than or equal to input on to be closed when the new process is spawned. The posix_spawn is safe to be implemented by interacting over /proc/self/fd, since the Linux spawni.c helper process does not use CLONE_FILES, so its has own file descriptor table and any failure (in /proc operation) aborts the process creation and returns an error to the caller. I am aware that this file action might be redundant to the current approach of POSIX in promoting O_CLOEXEC in more interfaces. However O_CLOEXEC is still not the default and for some specific usages, the caller needs to close all possible file descriptors to avoid them leaking. Some examples are CPython (discussed in BZ#10353) and OpenJDK jspawnhelper [2] (where OpenJDK spawns a helper process to exactly closes all file descriptors). Most likely any environment which calls functions that might open file descriptor under the hood and aim to use posix_spawn might face the same requirement. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu, and aarch64-linux-gnu. [1] https://docs.oracle.com/cd/E36784_01/html/E36874/posix-spawn-file-actions-addclosefrom-np-3c.html [2] https://github.com/openjdk/jdk/blob/master/src/java.base/unix/native/libjava/childproc.c#L82 --- NEWS | 5 + posix/Makefile | 4 +- posix/Versions | 3 + posix/spawn.h | 7 + posix/spawn_faction_addclosefrom.c | 58 ++++ posix/spawn_faction_destroy.c | 1 + posix/spawn_int.h | 6 + posix/spawn_int_abi.h | 27 ++ posix/tst-spawn5.c | 279 ++++++++++++++++++ sysdeps/generic/spawn_int_abi.h | 24 ++ sysdeps/mach/hurd/i386/libc.abilist | 1 + sysdeps/mach/hurd/spawni.c | 4 + sysdeps/posix/spawni.c | 4 + sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 + sysdeps/unix/sysv/linux/arc/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 + sysdeps/unix/sysv/linux/csky/libc.abilist | 1 + sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 + sysdeps/unix/sysv/linux/i386/libc.abilist | 1 + sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 + .../sysv/linux/m68k/coldfire/libc.abilist | 1 + .../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 + .../sysv/linux/microblaze/be/libc.abilist | 1 + .../sysv/linux/microblaze/le/libc.abilist | 1 + .../sysv/linux/mips/mips32/fpu/libc.abilist | 1 + .../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 + .../sysv/linux/mips/mips64/n32/libc.abilist | 1 + .../sysv/linux/mips/mips64/n64/libc.abilist | 1 + sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 + .../linux/powerpc/powerpc32/fpu/libc.abilist | 1 + .../powerpc/powerpc32/nofpu/libc.abilist | 1 + .../linux/powerpc/powerpc64/be/libc.abilist | 1 + .../linux/powerpc/powerpc64/le/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv32/libc.abilist | 1 + .../unix/sysv/linux/riscv/rv64/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-32/libc.abilist | 1 + .../unix/sysv/linux/s390/s390-64/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 + sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 + .../sysv/linux/sparc/sparc32/libc.abilist | 1 + .../sysv/linux/sparc/sparc64/libc.abilist | 1 + sysdeps/unix/sysv/linux/spawn_int_abi.h | 25 ++ sysdeps/unix/sysv/linux/spawni.c | 36 ++- .../unix/sysv/linux/x86_64/64/libc.abilist | 1 + .../unix/sysv/linux/x86_64/x32/libc.abilist | 1 + 47 files changed, 500 insertions(+), 16 deletions(-) create mode 100644 posix/spawn_faction_addclosefrom.c create mode 100644 posix/spawn_int_abi.h create mode 100644 posix/tst-spawn5.c create mode 100644 sysdeps/generic/spawn_int_abi.h create mode 100644 sysdeps/unix/sysv/linux/spawn_int_abi.h diff --git a/NEWS b/NEWS index 221eb4d98e..f37864b926 100644 --- a/NEWS +++ b/NEWS @@ -34,6 +34,11 @@ Major new features: greater than given integer. This function is a GNU extension, although it also present in other systems. +* The posix_spawn_file_actions_closefrom_np has been added, enabling + posix_spawn and posix_spawnp to close all file descriptors greater than + a giver interger. This function is a GNU extension, although Solaris also + provides a similar function. + Deprecated and removed features, and other changes affecting compatibility: * The mallinfo function is marked deprecated. Callers should call diff --git a/posix/Makefile b/posix/Makefile index 4bfc8d942c..d40636547e 100644 --- a/posix/Makefile +++ b/posix/Makefile @@ -57,6 +57,7 @@ routines := \ spawn_faction_init spawn_faction_destroy spawn_faction_addclose \ spawn_faction_addopen spawn_faction_adddup2 spawn_valid_fd \ spawn_faction_addchdir spawn_faction_addfchdir \ + spawn_faction_addclosefrom \ spawnattr_init spawnattr_destroy \ spawnattr_getdefault spawnattr_setdefault \ spawnattr_getflags spawnattr_setflags \ @@ -102,7 +103,7 @@ tests := test-errno tstgetopt testfnm runtests runptests \ tst-sysconf-empty-chroot tst-glob_symlinks tst-fexecve \ tst-glob-tilde test-ssize-max tst-spawn4 bug-regex37 \ bug-regex38 tst-regcomp-truncated tst-spawn-chdir \ - tst-wordexp-nocmd + tst-wordexp-nocmd tst-spawn5 tests-internal := bug-regex5 bug-regex20 bug-regex33 \ tst-rfc3484 tst-rfc3484-2 tst-rfc3484-3 \ tst-glob_lstat_compat tst-spawn4-compat @@ -258,6 +259,7 @@ tst-exec-static-ARGS = $(tst-exec-ARGS) tst-execvpe5-ARGS = -- $(host-test-program-cmd) tst-spawn-ARGS = -- $(host-test-program-cmd) tst-spawn-static-ARGS = $(tst-spawn-ARGS) +tst-spawn5-ARGS = -- $(host-test-program-cmd) tst-dir-ARGS = `pwd` `cd $(common-objdir)/$(subdir); pwd` `cd $(common-objdir); pwd` $(objpfx)tst-dir tst-chmod-ARGS = $(objdir) tst-vfork3-ARGS = --test-dir=$(objpfx) diff --git a/posix/Versions b/posix/Versions index 7d06a6d0c0..95d7b01126 100644 --- a/posix/Versions +++ b/posix/Versions @@ -147,6 +147,9 @@ libc { } GLIBC_2.30 { } + GLIBC_2.33 { + posix_spawn_file_actions_addclosefrom_np; + } GLIBC_PRIVATE { __libc_fork; __libc_pread; __libc_pwrite; __nanosleep_nocancel; __pause_nocancel; diff --git a/posix/spawn.h b/posix/spawn.h index be6bd591a3..21ea563425 100644 --- a/posix/spawn.h +++ b/posix/spawn.h @@ -213,6 +213,13 @@ extern int posix_spawn_file_actions_addchdir_np (posix_spawn_file_actions_t * extern int posix_spawn_file_actions_addfchdir_np (posix_spawn_file_actions_t *, int __fd) __THROW __nonnull ((1)); + +/* Add an action to close all file descriptor greater than FROM during + spawn. This affects the subsequent file actions. */ +extern int posix_spawn_file_actions_addclosefrom_np (posix_spawn_file_actions_t *, + int __from) + __THROW __nonnull ((1)); + #endif __END_DECLS diff --git a/posix/spawn_faction_addclosefrom.c b/posix/spawn_faction_addclosefrom.c new file mode 100644 index 0000000000..3a295580bc --- /dev/null +++ b/posix/spawn_faction_addclosefrom.c @@ -0,0 +1,58 @@ +/* Add a closefrom to a file action list for posix_spawn. + Copyright (C) 2020 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 + +int +__posix_spawn_file_actions_addclosefrom (posix_spawn_file_actions_t + *file_actions, int from) +{ +#if __SPAWN_SUPPORT_CLOSEFROM + struct __spawn_action *rec; + + if (!__spawn_valid_fd (from)) + return EBADF; + + /* Allocate more memory if needed. */ + if (file_actions->__used == file_actions->__allocated + && __posix_spawn_file_actions_realloc (file_actions) != 0) + /* This can only mean we ran out of memory. */ + return ENOMEM; + + /* Add the new value. */ + rec = &file_actions->__actions[file_actions->__used]; + rec->tag = spawn_do_closefrom; + rec->action.closefrom_action.from = from; + + /* Account for the new entry. */ + ++file_actions->__used; + + return 0; +#else + __set_errno (EINVAL); + return -1; +#endif +} +weak_alias (__posix_spawn_file_actions_addclosefrom, + posix_spawn_file_actions_addclosefrom_np) +#if !__SPAWN_SUPPORT_CLOSEFROM +stub_warning (posix_spawn_file_actions_addclosefrom_np) +#endif diff --git a/posix/spawn_faction_destroy.c b/posix/spawn_faction_destroy.c index 098385e1e0..33045e2c7f 100644 --- a/posix/spawn_faction_destroy.c +++ b/posix/spawn_faction_destroy.c @@ -39,6 +39,7 @@ __posix_spawn_file_actions_destroy (posix_spawn_file_actions_t *file_actions) case spawn_do_close: case spawn_do_dup2: case spawn_do_fchdir: + case spawn_do_closefrom: /* No cleanup required. */ break; } diff --git a/posix/spawn_int.h b/posix/spawn_int.h index 9be54c0416..512dcea0da 100644 --- a/posix/spawn_int.h +++ b/posix/spawn_int.h @@ -20,6 +20,7 @@ #define _SPAWN_INT_H #include +#include #include /* Data structure to contain the action information. */ @@ -32,6 +33,7 @@ struct __spawn_action spawn_do_open, spawn_do_chdir, spawn_do_fchdir, + spawn_do_closefrom, } tag; union @@ -60,6 +62,10 @@ struct __spawn_action { int fd; } fchdir_action; + struct + { + int from; + } closefrom_action; } action; }; diff --git a/posix/spawn_int_abi.h b/posix/spawn_int_abi.h new file mode 100644 index 0000000000..5fda4d3442 --- /dev/null +++ b/posix/spawn_int_abi.h @@ -0,0 +1,27 @@ +/* Internal ABI specific for posix_spawn functionality. Generic version. + Copyright (C) 2020 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 _SPAWN_INT_ABI_H +#define _SPAWN_INT_ABI_H + +/* The closefrom file actions requires either a syscall or an arch-specific + way to interact over all file descriptors and act uppon them (such + /proc/self/fd on Linux). */ +#define __SPAWN_SUPPOR_CLOSEFROM 0 + +#endif /* _SPAWN_INT_H */ diff --git a/posix/tst-spawn5.c b/posix/tst-spawn5.c new file mode 100644 index 0000000000..1f901d112b --- /dev/null +++ b/posix/tst-spawn5.c @@ -0,0 +1,279 @@ +/* Tests for posix_spawn signal handling. + Copyright (C) 2020 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 +#include + +#include +#include + +/* Nonzero if the program gets called via `exec'. */ +static int restart; + +/* Hold the four initial argument used to respawn the process. */ +static char *initial_argv[7]; + +#define CMDLINE_OPTIONS \ + { "restart", no_argument, &restart, 1 }, + +enum +{ + maximum_fd = 100, + half_fd = maximum_fd / 2, +}; +static int fds[maximum_fd + 1]; + + +/* Called on process re-execution. */ +_Noreturn static void +handle_restart (int argc, char *argv[]) +{ + size_t nfds = argc > 1 ? argc - 1 : 0; + struct fd_t + { + int fd; + _Bool found; + } *fds = xmalloc (sizeof (struct fd_t) * nfds); + for (int i = 0; i < nfds; i++) + { + char *endptr; + long int fd = strtol (argv[i+1], &endptr, 10); + if (*endptr != '\0' || fd < 0 || fd > INT_MAX) + FAIL_EXIT1 ("readdir: invalid file descriptor value: %s", argv[i]); + fds[i].fd = fd; + fds[i].found = false; + } + + DIR *dirp = opendir (FD_TO_FILENAME_PREFIX); + if (dirp == NULL) + FAIL_EXIT1 ("opendir (\"" FD_TO_FILENAME_PREFIX "\"): %m"); + + while (true) + { + errno = 0; + struct dirent64 *e = readdir64 (dirp); + if (e == NULL) + { + if (errno != 0) + FAIL_EXIT1 ("readdir: %m"); + break; + } + + if (e->d_name[0] == '.') + continue; + + char *endptr; + long int fd = strtol (e->d_name, &endptr, 10); + if (*endptr != '\0' || fd < 0 || fd > INT_MAX) + FAIL_EXIT1 ("readdir: invalid file descriptor name: /proc/self/fd/%s", + e->d_name); + + /* Skip the descriptor which is used to enumerate the descriptors. */ + if (fd == dirfd (dirp) + || fd == STDIN_FILENO + || fd == STDOUT_FILENO + || fd == STDERR_FILENO) + continue; + + bool found = false; + for (int i = 0; i < nfds; i++) + if (fds[i].fd == fd) + fds[i].found = found = true; + + if (!found) + FAIL_EXIT1 ("unexpected open file descriptor: %ld", fd); + } + closedir (dirp); + + for (int i = 0; i < nfds; i++) + if (!fds[i].found) + FAIL_EXIT1 ("file descriptor %d not closed", fds[i].fd); + + free (fds); + + exit (EXIT_SUCCESS); +} + +static void +spawn_closefrom_test (posix_spawn_file_actions_t *fa, int lowfd, + int *extrafds, size_t nextrafds) +{ + /* 6 elements from initial_argv (path to ld.so, '--library-path', the + path', application name', '--direct', and '--restart'), up to + 2 * maximum_fd arguments (the expected open file descriptors), plus + NULL. */ + enum { argv_size = array_length (initial_argv) + 2 * maximum_fd + 1 }; + char *args[argv_size]; + int argc = 0; + + for (char **arg = initial_argv; *arg != NULL; arg++) + args[argc++] = *arg; + + for (int i = 0; i < lowfd; i++) + args[argc++] = xasprintf ("%d", fds[i]); + + for (int i = 0; i < nextrafds; i++) + args[argc++] = xasprintf ("%d", extrafds[i]); + + args[argc] = NULL; + TEST_VERIFY (argc < argv_size); + + pid_t pid; + int status; + + TEST_COMPARE (posix_spawn (&pid, args[0], fa, NULL, args, environ), 0); + TEST_COMPARE (xwaitpid (pid, &status, 0), pid); + TEST_VERIFY (WIFEXITED (status)); + TEST_VERIFY (!WIFSIGNALED (status)); + TEST_COMPARE (WEXITSTATUS (status), 0); +} + +static void +do_test_closefrom (void) +{ + for (int i = 0; i < array_length (fds); i++) + fds[i] = xopen ("/dev/null", O_WRONLY, 0); + + /* Close half of the descriptors and check result. */ + { + posix_spawn_file_actions_t fa; + TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0); + + int ret = posix_spawn_file_actions_addclosefrom_np (&fa, fds[half_fd]); + if (ret == -1 && errno == EINVAL) + /* Hurd currently does not support closefrom fileaction. */ + FAIL_UNSUPPORTED ("posix_spawn_file_actions_addclosefrom_np unsupported"); + TEST_COMPARE (ret, 0); + + spawn_closefrom_test (&fa, half_fd, NULL, 0); + + TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0); + } + + /* Create some gaps, close up to a threshold, and check result. */ + xclose (57); + xclose (78); + xclose (81); + xclose (82); + xclose (84); + xclose (90); + + { + posix_spawn_file_actions_t fa; + TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0); + + TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, + fds[half_fd]), + 0); + + spawn_closefrom_test (&fa, half_fd, NULL, 0); + + TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0); + } + + /* Close the remmaining but the last one. */ + { + posix_spawn_file_actions_t fa; + TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0); + + TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, fds[1]), 0); + + spawn_closefrom_test (&fa, 1, NULL, 0); + + TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0); + } + + /* Close everything. */ + { + posix_spawn_file_actions_t fa; + TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0); + + TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, fds[0]), 0); + + spawn_closefrom_test (&fa, 0, NULL, 0); + + TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0); + } + + /* Close a range and add some file actions. */ + { + posix_spawn_file_actions_t fa; + TEST_COMPARE (posix_spawn_file_actions_init (&fa), 0); + + TEST_COMPARE (posix_spawn_file_actions_addclosefrom_np (&fa, fds[1]), 0); + TEST_COMPARE (posix_spawn_file_actions_addopen (&fa, fds[0], "/dev/null", + 0666, O_RDONLY), 0); + TEST_COMPARE (posix_spawn_file_actions_adddup2 (&fa, fds[0], fds[1]), 0); + TEST_COMPARE (posix_spawn_file_actions_addopen (&fa, fds[0], "/dev/null", + 0666, O_RDONLY), 0); + + spawn_closefrom_test (&fa, 0, (int[]){fds[0], fds[1]}, 2); + + TEST_COMPARE (posix_spawn_file_actions_destroy (&fa), 0); + } +} + + +static int +do_test (int argc, char *argv[]) +{ + /* We must have either: + + - one or four parameters if called initially: + + argv[1]: path for ld.so optional + + argv[2]: "--library-path" optional + + argv[3]: the library path optional + + argv[4]: the application name + + - six parameters left if called through re-execution: + + argv[1]: the application name + + argv[2]: first expected open file descriptor + + argv[n]: last expected open file descritptor + + * When built with --enable-hardcoded-path-in-tests or issued without + using the loader directly. */ + + if (restart) + handle_restart (argc, argv); + + initial_argv[0] = argv[1]; /* path for ld.so */ + initial_argv[1] = argv[2]; /* "--library-path" */ + initial_argv[2] = argv[3]; /* the library path */ + initial_argv[3] = argv[4]; /* the application name */ + initial_argv[4] = (char *) "--direct"; + initial_argv[5] = (char *) "--restart"; + + do_test_closefrom (); + + return 0; +} + +#define TEST_FUNCTION_ARGV do_test +#include diff --git a/sysdeps/generic/spawn_int_abi.h b/sysdeps/generic/spawn_int_abi.h new file mode 100644 index 0000000000..bfc8961598 --- /dev/null +++ b/sysdeps/generic/spawn_int_abi.h @@ -0,0 +1,24 @@ +/* Internal ABI specific for posix_spawn functionality. Generic version. + Copyright (C) 2020 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 _SPAWN_INT_ABI_H +#define _SPAWN_INT_ABI_H + +#define __SPAWN_SUPPORT_CLOSEFROM 0 + +#endif /* _SPAWN_INT_H */ diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist index fce67cf3ca..5b23d62b5d 100644 --- a/sysdeps/mach/hurd/i386/libc.abilist +++ b/sysdeps/mach/hurd/i386/libc.abilist @@ -2201,6 +2201,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/mach/hurd/spawni.c b/sysdeps/mach/hurd/spawni.c index 178b271e4e..9ea4fc972f 100644 --- a/sysdeps/mach/hurd/spawni.c +++ b/sysdeps/mach/hurd/spawni.c @@ -600,6 +600,10 @@ __spawni (pid_t *pid, const char *file, case spawn_do_fchdir: err = child_fchdir (action->action.fchdir_action.fd); break; + + case spawn_do_closefrom: + err = EINVAL; + break; } if (err) diff --git a/sysdeps/posix/spawni.c b/sysdeps/posix/spawni.c index 943a598771..d05d2c8520 100644 --- a/sysdeps/posix/spawni.c +++ b/sysdeps/posix/spawni.c @@ -231,6 +231,10 @@ __spawni_child (void *arguments) if (__fchdir (action->action.fchdir_action.fd) != 0) goto fail; break; + + case spawn_do_closefrom: + __set_errno (EINVAL); + goto fail; } } } diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index 811d3b3cd9..65d5c3cee4 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2171,5 +2171,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index d0bc011811..ac55ceba70 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -2253,6 +2253,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _IO_fprintf F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index c4e26b3cf6..24e623875d 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -1931,5 +1931,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist index 5ccd1fb07f..50086104ea 100644 --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist @@ -154,6 +154,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _Exit F diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index 5043e483b8..a4ebfccc74 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -152,6 +152,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _Exit F diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist index 6f3718cd14..4b45f0a8a0 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2115,5 +2115,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index 84b474dba4..b574604263 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -2074,6 +2074,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index 4c1399102e..51795cd925 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -2240,6 +2240,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist index 9fcaa40c34..bafbc98f69 100644 --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist @@ -2106,6 +2106,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index ccb780d9c7..8c3fc11399 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -155,6 +155,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _Exit F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index 3afaa1c70e..10a11773f2 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -2186,6 +2186,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index 266063d0e8..e908a7a19a 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2166,5 +2166,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist index 5d893ec4d1..d8f3ff6dec 100644 --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist @@ -2162,5 +2162,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index 6207a15a09..1c41ce7c83 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -2157,6 +2157,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist index 860e5fecfa..dcec226837 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist @@ -2154,6 +2154,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index daed5ae2a8..022a7ec721 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -2163,6 +2163,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 7b6edfe8f5..a312612703 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -2157,6 +2157,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index 9dd7d64500..d4e4096a11 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2204,5 +2204,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index c561e5cf36..01705658c0 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -2213,6 +2213,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _IO_fprintf F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index d25bf75ed3..eea881eeae 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -2245,6 +2245,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _IO_fprintf F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index 248fab8212..bb346370ad 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist @@ -2076,6 +2076,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _IO_fprintf F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index d02fa6b3d2..0dad53bc80 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2366,5 +2366,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index 56d1a16b2a..7ee1f2e189 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -1304,6 +1304,7 @@ GLIBC_2.33 posix_openpt F GLIBC_2.33 posix_spawn F GLIBC_2.33 posix_spawn_file_actions_addchdir_np F GLIBC_2.33 posix_spawn_file_actions_addclose F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 posix_spawn_file_actions_adddup2 F GLIBC_2.33 posix_spawn_file_actions_addfchdir_np F GLIBC_2.33 posix_spawn_file_actions_addopen F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 8fcd329728..51fc25677d 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2133,5 +2133,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index b06cc94710..61bda38fb0 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -2211,6 +2211,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _IO_fprintf F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index 6ede1579ca..a73bc16ae0 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -2112,6 +2112,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _IO_fprintf F diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist index 0f426028a1..974090f39b 100644 --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist @@ -2080,6 +2080,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index 8637b683d6..910c8e752d 100644 --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist @@ -2078,6 +2078,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index dc7c01f734..fabbdaeef0 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -2202,6 +2202,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 _IO_fprintf F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index 67d361c881..0ad7f0b18c 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -2129,6 +2129,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/spawn_int_abi.h b/sysdeps/unix/sysv/linux/spawn_int_abi.h new file mode 100644 index 0000000000..84b31104c5 --- /dev/null +++ b/sysdeps/unix/sysv/linux/spawn_int_abi.h @@ -0,0 +1,25 @@ +/* Internal ABI specific for posix_spawn functionality. Linux version. + Copyright (C) 2020 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 _SPAWN_INT_ABI_H +#define _SPAWN_INT_ABI_H + +/* spawni.c implements closefrom by interacting over /proc/self/fd. */ +#define __SPAWN_SUPPORT_CLOSEFROM 1 + +#endif /* _SPAWN_INT_H */ diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c index f157bfffd2..f496578d19 100644 --- a/sysdeps/unix/sysv/linux/spawni.c +++ b/sysdeps/unix/sysv/linux/spawni.c @@ -16,22 +16,17 @@ License along with the GNU C Library; if not, see . */ -#include -#include -#include -#include -#include -#include -#include -#include -#include +#include +#include +#include #include +#include +#include #include -#include -#include -#include -#include -#include "spawn_int.h" +#include +#include +#include +#include /* The Linux implementation of posix_spawn{p} uses the clone syscall directly with CLONE_VM and CLONE_VFORK flags and an allocated stack. The new stack @@ -280,6 +275,15 @@ __spawni_child (void *arguments) if (__fchdir (action->action.fchdir_action.fd) != 0) goto fail; break; + + case spawn_do_closefrom: + { + int lowfd = action->action.closefrom_action.from; + /* close_range is a cancellation entrypoint. */ + int r = INLINE_SYSCALL_CALL (close_range, lowfd, ~0U, 0); + if (r != 0 && !__closefrom_fallback (lowfd)) + goto fail; + } break; } } } @@ -344,7 +348,9 @@ __spawnix (pid_t * pid, const char *file, /* We need at least a few pages in case the compiler's stack checking is enabled. In some configs, it is known to use at least 24KiB. We use 32KiB to be "safe" from anything the compiler might do. Besides, the - extra pages won't actually be allocated unless they get used. */ + extra pages won't actually be allocated unless they get used. + It also acts the slack for spawn_closefrom (including MIPS64 getdents64 + where it might use about 1k extra stack space. */ argv_size += (32 * 1024); size_t stack_size = ALIGN_UP (argv_size, GLRO(dl_pagesize)); void *stack = __mmap (NULL, stack_size, prot, diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index 94bb5a0fa7..c17d5d93c3 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -2087,6 +2087,7 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F GLIBC_2.4 __confstr_chk F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index e94ce733ab..e8ff4b7cc9 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2184,5 +2184,6 @@ GLIBC_2.33 lstat64 F GLIBC_2.33 mallinfo2 F GLIBC_2.33 mknod F GLIBC_2.33 mknodat F +GLIBC_2.33 posix_spawn_file_actions_addclosefrom_np F GLIBC_2.33 stat F GLIBC_2.33 stat64 F