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1836bb2ebf
The 106ff08526 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: H.J. Lu <hjl.tools@gmail.com>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* Check if internal buffer reallocation work for large paths (BZ #28126)
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <ftw.h>
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#include <limits.h>
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#include <string.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/xunistd.h>
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#include <stdio.h>
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static int
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my_func (const char *file, const struct stat *sb, int flag)
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{
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return 0;
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}
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static const char folder[NAME_MAX] = { [0 ... 253] = 'a', [254] = '\0' };
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#define NSUBFOLDERS 16
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static int nsubfolders;
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static void
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do_cleanup (void)
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{
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xchdir ("..");
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for (int i = 0; i < nsubfolders; i++)
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{
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remove (folder);
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xchdir ("..");
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}
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remove (folder);
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}
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#define CLEANUP_HANDLER do_cleanup
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static void
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check_mkdir (const char *path)
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{
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int r = mkdir (path, 0777);
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/* Some filesystem such as overlayfs does not support larger path required
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to trigger the internal buffer reallocation. */
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if (r != 0)
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{
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if (errno == ENAMETOOLONG)
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FAIL_UNSUPPORTED ("the filesystem does not support the required"
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"large path");
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else
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FAIL_EXIT1 ("mkdir (\"%s\", 0%o): %m", folder, 0777);
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}
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}
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static int
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do_test (void)
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{
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char *tempdir = support_create_temp_directory ("tst-bz28126");
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/* Create path with various subfolders to force an internal buffer
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reallocation within ntfw. */
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char *path = xasprintf ("%s/%s", tempdir, folder);
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check_mkdir (path);
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xchdir (path);
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free (path);
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for (int i = 0; i < NSUBFOLDERS - 1; i++)
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{
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check_mkdir (folder);
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xchdir (folder);
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nsubfolders++;
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}
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TEST_COMPARE (ftw (tempdir, my_func, 20), 0);
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free (tempdir);
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do_cleanup ();
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return 0;
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}
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#include <support/test-driver.c>
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