From patchwork Mon Sep 27 15:26:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 45476 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 615A0385843A for ; Mon, 27 Sep 2021 15:26:40 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 615A0385843A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1632756400; bh=257kyCE2itXyCPBAmPAJIq/MbKcc/p5oADfw+bacDUA=; h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:From; b=MvwWB46HAV+sHwNVgiypines5d4kiBhunviyHeo2S8r01YjIQp2x01vzXK4sEzcm6 Ly8hVoZXv+RvwJo/K6v6l+oYv4MMeYS+vzAZPKbaA2K6RTdVSiGzCmAvEfk50VQUGS E0zC08NWw/L9x1hjsTJlr80FCaLbMfXfgqE7NOHM= 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 4A7453858D3C for ; Mon, 27 Sep 2021 15:26:18 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 4A7453858D3C Received: by mail-qt1-x82b.google.com with SMTP id z7so3338332qto.7 for ; Mon, 27 Sep 2021 08:26:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=257kyCE2itXyCPBAmPAJIq/MbKcc/p5oADfw+bacDUA=; b=WCUC4vz8jQssbWDBhRDWhrd+3e4PHho5nI/o/Ym5baCWN60Ljn3xd6pzLTHXtEonml GrbJx8OLbIAwYEWwIDr6Wtyt5KQOkm8hdZPx4efqgxuYOW4OXNQp67yfmiegp/OJcao6 5b8vKS4f6oy0SYQ/yGErryfJ/+0lPTTZ44JlBFW5XcMI+y852ccPh5Yy8mn3U2NOtt5h Kesz05CM5qAPJdBJ/kwor4FgcABqcsVBQozBjXtUKEWxXMWD5XTSb2OoEUYMSKxBSQJh 1fXC1O+Ocejwsf5FGy9LwedGIc8kLqvlFa62v46GuutGp4iqGVnG1mopvsFsr+yaQLmm jb6Q== X-Gm-Message-State: AOAM533gN9AhY0UnOo0AfnpnGCRd8CcepGojq303gL42hzk+5Wa/UUDG lCabtAo8HvF5OHbiLL8IxTJSgF2Zsvi4Pg== X-Google-Smtp-Source: ABdhPJzFgG79CrJ+80ud4Xe5HNZ8Fh+ZPjLRGzShmKy9i50/LBlYC/MH5uHonmrI3qKw7x04xN/x8Q== X-Received: by 2002:ac8:3b5a:: with SMTP id r26mr397677qtf.171.1632756377461; Mon, 27 Sep 2021 08:26:17 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:b338:9c1f:21e4:d45:b086]) by smtp.gmail.com with ESMTPSA id p19sm9604116qkk.83.2021.09.27.08.26.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Sep 2021 08:26:17 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v6] io: Fix ftw internal realloc buffer (BZ #28126) Date: Mon, 27 Sep 2021 12:26:13 -0300 Message-Id: <20210927152613.1551692-1-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Spam-Status: No, score=-12.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) 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 Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" The 106ff08526d3ca did not take in consideration the buffer might be reallocated if the total path is larger than PATH_MAX. The realloc uses 'dirbuf', where 'dirstreams' is the allocated buffer. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar --- io/Makefile | 1 + io/ftw.c | 13 +++--- io/tst-ftw-bz28126.c | 97 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 106 insertions(+), 5 deletions(-) create mode 100644 io/tst-ftw-bz28126.c diff --git a/io/Makefile b/io/Makefile index 9871ecbc74..ecf65aba60 100644 --- a/io/Makefile +++ b/io/Makefile @@ -79,6 +79,7 @@ tests := test-utime test-stat test-stat2 test-lfs tst-getcwd \ tst-futimens \ tst-utimensat \ tst-closefrom \ + tst-ftw-bz28126 tests-time64 := \ tst-futimens-time64 \ diff --git a/io/ftw.c b/io/ftw.c index f0db173727..3964c07bbb 100644 --- a/io/ftw.c +++ b/io/ftw.c @@ -391,13 +391,16 @@ process_entry (struct ftw_data *data, struct dir_data *dir, const char *name, if (data->dirbufsize < new_buflen) { /* Enlarge the buffer. */ - char *newp; - - data->dirbufsize = 2 * new_buflen; - newp = (char *) realloc (data->dirbuf, data->dirbufsize); + size_t newsize = 2 * new_buflen; + void *newp = realloc (data->dirstreams, data->maxdir + * sizeof (struct dir_data *) + + newsize); if (newp == NULL) return -1; - data->dirbuf = newp; + data->dirstreams = newp; + data->dirbufsize = newsize; + data->dirbuf = (char *) data->dirstreams + + data->maxdir * sizeof (struct dir_data *); } *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0'; diff --git a/io/tst-ftw-bz28126.c b/io/tst-ftw-bz28126.c new file mode 100644 index 0000000000..94044ab9d1 --- /dev/null +++ b/io/tst-ftw-bz28126.c @@ -0,0 +1,97 @@ +/* Check if internal buffer reallocation work for large paths (BZ #28126) + Copyright (C) 2021 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 + +static int +my_func (const char *file, const struct stat *sb, int flag) +{ + return 0; +} + +static const char folder[NAME_MAX] = { [0 ... 253] = 'a', [254] = '\0' }; + +#define NSUBFOLDERS 16 +static int nsubfolders; + +static void +do_cleanup (void) +{ + xchdir (".."); + for (int i = 0; i < nsubfolders; i++) + { + remove (folder); + xchdir (".."); + } + remove (folder); +} +#define CLEANUP_HANDLER do_cleanup + +static void +check_mkdir (const char *path) +{ + int r = mkdir (path, 0777); + /* Some filesystem such as overlayfs does not support larger path required + to trigger the internal buffer reallocation. */ + if (r != 0) + { + if (errno == ENAMETOOLONG) + FAIL_UNSUPPORTED ("the filesystem does not support the required" + "large path"); + else + FAIL_EXIT1 ("mkdir (\"%s\", 0%o): %m", folder, 0777); + } +} + +static int +do_test (void) +{ + char *tempdir = support_create_temp_directory ("tst-bz28126"); + + /* Create path with various subfolders to force an internal buffer + reallocation within ntfw. */ + char *path = xasprintf ("%s/%s", tempdir, folder); + check_mkdir (path); + xchdir (path); + free (path); + for (int i = 0; i < NSUBFOLDERS - 1; i++) + { + check_mkdir (folder); + xchdir (folder); + nsubfolders++; + } + + TEST_COMPARE (ftw (tempdir, my_func, 20), 0); + + free (tempdir); + + do_cleanup (); + + return 0; +} + +#include