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c43f517e2a
* tests/cp/nfs-removal-race.sh: This test was invalid since v8.32 as we now use fstatat() rather than stat(). Also since commit v9.0-66-ge2daa8f79 we leverage the errno from open(O_DIRECTORY) to avoid a stat, so pass --no-target-directory to ensure fstatat() is called. Discussed in https://github.com/coreutils/coreutils/pull/161
124 lines
3.9 KiB
Bash
Executable File
124 lines
3.9 KiB
Bash
Executable File
#!/bin/sh
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# Running cp S D on an NFS client while another client has just removed D
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# would lead (w/coreutils-8.16 and earlier) to cp's initial stat call
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# seeing (via stale NFS cache) that D exists, so that cp would then call
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# open without the O_CREAT flag. Yet, the open must actually consult
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# the server, which confesses that D has been deleted, thus causing the
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# open call to fail with ENOENT.
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#
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# This test simulates that situation by intercepting stat for a nonexistent
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# destination, D, and making the stat fill in the result struct for another
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# file and return 0.
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#
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# This test is skipped on systems that lack LD_PRELOAD support; that's fine.
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# Similarly, on a system that lacks <dlfcn.h>, skipping it is fine.
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# Note: glibc 2.33+ removed __xstat, so we intercept both __xstat (old glibc)
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# and stat (new glibc) to support all systems.
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# Copyright (C) 2012-2026 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program 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
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ cp
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require_gcc_shared_
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# Replace each stat call with a call to this wrapper.
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# We intercept both __xstat (glibc < 2.33) and stat (glibc >= 2.33)
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# to support all glibc versions.
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cat > k.c <<'EOF' || framework_failure_
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <sys/types.h>
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#include <dlfcn.h>
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#define __xstat __xstat_orig
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#include <sys/stat.h>
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#include <stddef.h>
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#undef __xstat
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static int
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is_dest_path (const char *path)
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{
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return *path == 'd' && path[1] == 0;
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}
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static const char *
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redirect_path (const char *path)
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{
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/* When asked to stat nonexistent "d",
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return results suggesting it exists. */
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if (is_dest_path (path))
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{
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/* Only mark preloaded when we intercept stat on the destination "d".
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This ensures the test verifies that cp actually calls stat on
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the destination, not just any file. */
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fclose (fopen ("preloaded", "w"));
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return "d2";
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}
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return path;
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}
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/* For glibc < 2.33: stat() calls __xstat() internally */
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int
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__xstat (int ver, const char *path, struct stat *st)
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{
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static int (*real_xstat) (int, const char *, struct stat *) = NULL;
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if (!real_xstat)
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real_xstat = dlsym (RTLD_NEXT, "__xstat");
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if (!real_xstat)
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return -1;
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return real_xstat (ver, redirect_path (path), st);
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}
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/* For glibc >= 2.33: stat() is a direct symbol */
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int
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stat (const char *path, struct stat *st)
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{
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static int (*real_stat) (const char *, struct stat *) = NULL;
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if (!real_stat)
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real_stat = dlsym (RTLD_NEXT, "stat");
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return real_stat (redirect_path (path), st);
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}
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/* Since coreutils v8.32 we use fstatat() rather than stat() */
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int fstatat(int dirfd, const char *restrict path,
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struct stat *restrict statbuf, int flags)
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{
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static int (*real_fstatat) (int dirfd, const char *restrict pathname,
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struct stat *restrict statbuf, int flags) = NULL;
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if (!real_fstatat)
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real_fstatat = dlsym (RTLD_NEXT, "fstatat");
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return real_fstatat (dirfd, redirect_path (path), statbuf, flags);
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}
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EOF
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# Then compile/link it:
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gcc_shared_ k.c k.so \
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|| framework_failure_ 'failed to build shared library'
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touch d2 || framework_failure_
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echo xyz > src || framework_failure_
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# Finally, run the test:
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LD_PRELOAD=$LD_PRELOAD:./k.so cp -T src d || fail=1
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test -f preloaded || skip_ 'LD_PRELOAD was ineffective?'
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compare src d || fail=1
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Exit $fail
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