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stress-chmod.c
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stress-chmod.c
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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2024 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#if defined(HAVE_LIBGEN_H)
#include <libgen.h>
#endif
static const stress_help_t help[] = {
{ NULL, "chmod N", "start N workers thrashing chmod file mode bits " },
{ NULL, "chmod-ops N", "stop chmod workers after N bogo operations" },
{ NULL, NULL, NULL }
};
static const mode_t modes[] = {
#if defined(S_ISUID)
S_ISUID,
#endif
#if defined(S_ISGID)
S_ISGID,
#endif
#if defined(S_ISVTX)
S_ISVTX,
#endif
#if defined(S_IRUSR)
S_IRUSR,
#endif
#if defined(S_IWUSR)
S_IWUSR,
#endif
#if defined(S_IXUSR)
S_IXUSR,
#endif
#if defined(S_IRGRP)
S_IRGRP,
#endif
#if defined(S_IWGRP)
S_IWGRP,
#endif
#if defined(S_IXGRP)
S_IXGRP,
#endif
#if defined(S_IROTH)
S_IROTH,
#endif
#if defined(S_IWOTH)
S_IWOTH,
#endif
#if defined( S_IXOTH)
S_IXOTH,
#endif
0
};
static int OPTIMIZE3 stress_chmod_check(const int ret)
{
static const int ignore_errors[] = {
#if defined(ENOENT)
ENOENT,
#endif
#if defined(ENOTDIR)
ENOTDIR,
#endif
#if defined(ENOSYS)
ENOSYS,
#endif
#if defined(EFTYPE)
EFTYPE,
#endif
#if defined(EPERM)
EPERM,
#endif
};
size_t i;
if (!ret)
return 0;
for (i = 0; i < SIZEOF_ARRAY(ignore_errors); i++) {
if (errno == ignore_errors[i])
return 0;
}
return -1;
}
/*
* do_fchmod()
* fchmod the 4 different masks from a mode flag, namely:
* mode flag
* all mode flags or'd together
* inverse mode flag
* inverse all mode flags or'd together
*/
static int do_fchmod(
const int fd,
const int bad_fd,
const size_t i,
const mode_t mask,
const mode_t all_mask)
{
stress_chmod_check(fchmod(fd, modes[i]) < 0);
stress_chmod_check(fchmod(fd, mask) < 0);
stress_chmod_check(fchmod(fd, modes[i] ^ all_mask) < 0);
stress_chmod_check(fchmod(fd, mask ^ all_mask) < 0);
/*
* Exercise bad fchmod, ignore failure
*/
VOID_RET(int, fchmod(bad_fd, modes[i]));
return 0;
}
/*
* do_chmod()
* chmod the 4 different masks from a mode flag, namely:
* mode flag
* all mode flags or'd together
* inverse mode flag
* inverse all mode flags or'd together
*/
static int do_chmod(
const int dfd,
const int bad_fd,
const char *filebase,
const char *filename,
const char *longpath,
const size_t i,
const mode_t mask,
const mode_t all_mask,
const size_t mode_count,
const int *mode_perms)
{
static size_t idx;
if (!mode_count)
return 0;
(void)chmod(filename, (mode_t)mode_perms[idx]);
idx++;
if (idx >= mode_count)
idx = 0;
stress_chmod_check(chmod(filename, modes[i]) < 0);
stress_chmod_check(chmod(filename, mask) < 0);
stress_chmod_check(chmod(filename, modes[i] ^ all_mask) < 0);
stress_chmod_check(chmod(filename, mask ^ all_mask) < 0);
if (dfd >= 0) {
#if defined(HAVE_FCHMODAT)
/*
* If we have fchmodat libc wrapper to system call then
* perform the call and also check
*/
stress_chmod_check(fchmodat(dfd, filebase, modes[i], 0) < 0);
stress_chmod_check(fchmodat(dfd, filebase, mask, 0) < 0);
stress_chmod_check(fchmodat(dfd, filebase, modes[i] ^ all_mask, 0) < 0);
stress_chmod_check(fchmodat(dfd, filebase, mask ^ all_mask, 0) < 0);
/*
* Exercise bad fchmodat, ignore failure
*/
VOID_RET(int, fchmodat(bad_fd, filebase, modes[i], 0));
#else
shim_fchmodat(dfd, filebase, modes[i], 0);
shim_fchmodat(dfd, filebase, mask, 0);
shim_fchmodat(dfd, filebase, modes[i] ^ all_mask, 0);
shim_fchmodat(dfd, filebase, mask ^ all_mask, 0);
/*
* Exercise bad fchmodat, ignore failure
*/
VOID_RET(int, shim_fchmodat(bad_fd, filebase, modes[i], 0));
#endif
#if defined(HAVE_FCHMODAT2)
/*
* If we have fchmodat2 libc wrapper to system call then
* perform the call and also check
*/
stress_chmod_check(fchmodat2(dfd, filebase, modes[i], 0) < 0);
stress_chmod_check(fchmodat2(dfd, filebase, mask, 0) < 0);
stress_chmod_check(fchmodat2(dfd, filebase, modes[i] ^ all_mask, 0) < 0);
stress_chmod_check(fchmodat2(dfd, filebase, mask ^ all_mask, 0) < 0);
/*
* Exercise bad fchmodat2, ignore failure
*/
VOID_RET(int, fchmodat2(bad_fd, filebase, modes[i], 0));
#else
shim_fchmodat2(dfd, filebase, modes[i], 0);
shim_fchmodat2(dfd, filebase, mask, 0);
shim_fchmodat2(dfd, filebase, modes[i] ^ all_mask, 0);
shim_fchmodat2(dfd, filebase, mask ^ all_mask, 0);
/*
* Exercise bad fchmodat2, ignore failure
*/
VOID_RET(int, shim_fchmodat2(bad_fd, filebase, modes[i], 0));
#endif
}
/*
* Exercise illegal filename
*/
VOID_RET(int, chmod("", modes[i]));
/*
* Exercise illegal overly long pathname
*/
VOID_RET(int, chmod(longpath, modes[i]));
return 0;
}
/*
* stress_chmod
* stress chmod
*/
static int stress_chmod(stress_args_t *args)
{
const pid_t ppid = getppid();
int fd = -1, rc = EXIT_FAILURE, retries = 0, dfd = -1;
size_t i;
const int bad_fd = stress_get_bad_fd();
mode_t all_mask = 0;
char filename[PATH_MAX], pathname[PATH_MAX], longpath[PATH_MAX + 16];
char tmp[PATH_MAX], *filebase;
int *mode_perms = NULL;
size_t mode_count;
for (i = 0; modes[i]; i++)
all_mask |= modes[i];
mode_count = stress_flag_permutation((int)all_mask, &mode_perms);
/*
* Allow for multiple workers to chmod the *same* file
*/
stress_temp_dir(pathname, sizeof(pathname), args->name, ppid, 0);
if (mkdir(pathname, S_IRUSR | S_IRWXU) < 0) {
if (errno != EEXIST) {
rc = stress_exit_status(errno);
pr_fail("%s: mkdir %s failed, errno=%d (%s)\n",
args->name, pathname, errno, strerror(errno));
free(mode_perms);
return rc;
}
}
#if defined(O_DIRECTORY)
dfd = open(pathname, O_DIRECTORY | O_RDONLY);
#else
UNEXPECTED
#endif
stress_rndstr(longpath, sizeof(longpath));
longpath[0] = '/';
(void)stress_temp_filename(filename, sizeof(filename),
args->name, ppid, 0, 0);
(void)shim_strscpy(tmp, filename, sizeof(tmp));
filebase = basename(tmp);
if (args->instance == 0) {
if ((fd = creat(filename, S_IRUSR | S_IWUSR)) < 0) {
rc = stress_exit_status(errno);
pr_fail("%s: create %s failed, errno=%d (%s)\n",
args->name, filename, errno, strerror(errno));
goto tidy;
}
} else {
/* Other instances must try to open the file */
for (;;) {
if ((fd = open(filename, O_RDWR)) > - 1)
break;
#if defined(__NetBSD__)
/* For some reason usleep blocks */
(void)shim_sched_yield();
#else
(void)shim_usleep(100000);
#endif
/* Timed out, then give up */
if (!stress_continue_flag()) {
rc = EXIT_SUCCESS;
goto tidy;
}
/* Too many retries? */
if (++retries >= 10000) {
pr_err("%s: chmod: file %s took %d "
"retries to open and gave up "
"(instance %" PRIu32 ")%s\n",
args->name, filename, retries, args->instance,
stress_get_fs_type(filename));
goto tidy;
}
}
}
stress_set_proc_state(args->name, STRESS_STATE_SYNC_WAIT);
stress_sync_start_wait(args);
stress_set_proc_state(args->name, STRESS_STATE_RUN);
do {
mode_t mask = 0;
for (i = 0; modes[i]; i++) {
mask |= modes[i];
if (do_fchmod(fd, bad_fd, i, mask, all_mask) < 0) {
pr_fail("%s: fchmod failed, errno=%d (%s)%s\n",
args->name, errno, strerror(errno),
stress_get_fs_type(filename));
}
if (do_chmod(dfd, bad_fd, filebase, filename, longpath, i,
mask, all_mask, mode_count, mode_perms) < 0) {
if ((errno == ENOENT) || (errno == ENOTDIR)) {
/*
* File was removed during test by
* another worker
*/
rc = EXIT_SUCCESS;
goto tidy;
}
pr_fail("%s: chmod %s failed, errno=%d (%s)%s\n",
args->name, filename, errno, strerror(errno),
stress_get_fs_type(filename));
}
}
shim_fsync(fd);
stress_bogo_inc(args);
} while (stress_continue(args));
rc = EXIT_SUCCESS;
tidy:
stress_set_proc_state(args->name, STRESS_STATE_DEINIT);
#if defined(O_DIRECTORY)
if (dfd >= 0)
(void)close(dfd);
#else
UNEXPECTED
#endif
if (fd >= 0) {
(void)fchmod(fd, 0666);
(void)close(fd);
}
(void)shim_unlink(filename);
(void)shim_rmdir(pathname);
free(mode_perms);
return rc;
}
const stressor_info_t stress_chmod_info = {
.stressor = stress_chmod,
.class = CLASS_FILESYSTEM | CLASS_OS,
.verify = VERIFY_ALWAYS,
.help = help
};