@@ -1,389 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
+ * Copyright (c) Linux Test Project, 2022
* Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
*/
-/*
- * DESCRIPTION
- * Check for basic mount(2) system call flags.
+/*\
+ * [Description]
+ *
+ * Check for basic mount(2) system call flags.
*
- * Verify that mount(2) syscall passes for each flag setting and validate
- * the flags
- * 1) MS_RDONLY - mount read-only.
- * 2) MS_NODEV - disallow access to device special files.
- * 3) MS_NOEXEC - disallow program execution.
- * 4) MS_SYNCHRONOUS - writes are synced at once.
- * 5) MS_REMOUNT - alter flags of a mounted FS.
- * 6) MS_NOSUID - ignore suid and sgid bits.
- * 7) MS_NOATIME - do not update access times.
+ * Verify that mount(2) syscall passes for each flag setting and validate
+ * the flags
+ *
+ * - MS_RDONLY - mount read-only.
+ * - MS_NODEV - disallow access to device special files.
+ * - MS_NOEXEC - disallow program execution.
+ * - MS_SYNCHRONOUS - writes are synced at once.
+ * - MS_REMOUNT - alter flags of a mounted FS.
+ * - MS_NOSUID - ignore suid and sgid bits.
+ * - MS_NOATIME - do not update access times.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
+#define TEMP_FILE "temp_file"
+#define FILE_MODE 0644
+#define SUID_MODE 0511
+
+#include <stdio.h>
#include <sys/types.h>
-#include <sys/mount.h>
-#include <sys/stat.h>
#include <sys/wait.h>
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
+#include <linux/limits.h>
+#include <stdlib.h>
#include <pwd.h>
-#include <unistd.h>
-
-#include "test.h"
-#include "safe_macros.h"
-
-static void setup(void);
-static void cleanup(void);
-static int test_rwflag(int, int);
-
-char *TCID = "mount03";
-int TST_TOTAL = 7;
-
-#define TEMP_FILE "temp_file"
-#define FILE_MODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
-#define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
- S_IXGRP|S_IROTH|S_IXOTH)
-#define SUID_MODE (S_ISUID|S_IRUSR|S_IXUSR|S_IXGRP|S_IXOTH)
-
-static const char mntpoint[] = "mntpoint";
-static const char *device;
-static const char *fs_type;
-static int fildes;
+#include "tst_test.h"
+#include "tst_safe_file_ops.h"
+#include "lapi/mount.h"
+
+#define MNTPOINT "mntpoint"
+#define TESTBIN "mount03_setuid_test"
+#define TCASE_ENTRY(_flags, _do_test) \
+ { \
+ .name = "Flag " #_flags, \
+ .flags = _flags, \
+ .do_test = _do_test \
+ }
+static int otfd;
static char write_buffer[BUFSIZ];
static char read_buffer[BUFSIZ];
-static char path_name[PATH_MAX];
static char file[PATH_MAX];
-
-long rwflags[] = {
- MS_RDONLY,
- MS_NODEV,
- MS_NOEXEC,
- MS_SYNCHRONOUS,
- MS_RDONLY,
- MS_NOSUID,
- MS_NOATIME,
+static uid_t nobody_uid;
+static gid_t nobody_gid;
+
+static void test_ms_nosuid(void);
+static void test_ms_rdonly(void);
+static void test_ms_nodev(void);
+static void test_noexec(void);
+static void test_ms_synchronous(void);
+static void test_ms_remount(void);
+static void test_ms_noatime(void);
+
+static struct tcase {
+ char *name;
+ unsigned int flags;
+ void (*do_test)(void);
+} tcases[] = {
+ TCASE_ENTRY(MS_RDONLY, test_ms_rdonly),
+ TCASE_ENTRY(MS_NODEV, test_ms_nodev),
+ TCASE_ENTRY(MS_NOEXEC, test_noexec),
+ TCASE_ENTRY(MS_SYNCHRONOUS, test_ms_synchronous),
+ TCASE_ENTRY(MS_RDONLY, test_ms_remount),
+ TCASE_ENTRY(MS_NOSUID, test_ms_nosuid),
+ TCASE_ENTRY(MS_NOATIME, test_ms_noatime),
};
-int main(int argc, char *argv[])
+static void test_ms_rdonly(void)
{
- int lc, i;
-
- tst_parse_opts(argc, argv, NULL, NULL);
-
- setup();
+ /* Validate MS_RDONLY flag of mount call */
- for (lc = 0; TEST_LOOPING(lc); lc++) {
+ snprintf(file, PATH_MAX, "%s/tmp", MNTPOINT);
+ TST_EXP_FAIL2(open(file, O_CREAT | O_RDWR, 0700),
+ EROFS, "mount(2) passed with flag MS_RDONLY: "
+ "open fail with EROFS as expected");
- tst_count = 0;
-
- for (i = 0; i < TST_TOTAL; ++i) {
+ otfd = TST_RET;
+}
- TEST(mount(device, mntpoint, fs_type, rwflags[i],
- NULL));
+static void test_ms_nosuid(void)
+{
+ /* Validate MS_NOSUID flag of mount call */
- if (TEST_RETURN != 0) {
- tst_resm(TFAIL | TTERRNO, "mount(2) failed");
- continue;
- }
+ pid_t pid;
+ int status;
- /* Validate the rwflag */
- if (test_rwflag(i, lc) == 1)
- tst_resm(TFAIL, "mount(2) failed while"
- " validating %ld", rwflags[i]);
- else
- tst_resm(TPASS, "mount(2) passed with "
- "rwflag = %ld", rwflags[i]);
+ pid = SAFE_FORK();
- TEST(tst_umount(mntpoint));
- if (TEST_RETURN != 0)
- tst_brkm(TBROK | TTERRNO, cleanup,
- "umount(2) failed for %s", mntpoint);
- }
+ if (!pid) {
+ SAFE_SETREUID(nobody_uid, nobody_gid);
+ SAFE_EXECLP(TESTBIN, TESTBIN, NULL);
}
- cleanup();
- tst_exit();
+ waitpid(pid, &status, 0);
+ if (WIFEXITED(status)) {
+ /* reset the setup_uid */
+ if (status)
+ tst_res(TPASS, "mount(2) passed with flag MS_NOSUID");
+ } else {
+ tst_res(TFAIL, "mount(2) failed with flag MS_NOSUID");
+ }
}
-/*
- * test_rwflag(int i, int cnt)
- * Validate the mount system call for rwflags.
- */
-int test_rwflag(int i, int cnt)
+static void test_ms_nodev(void)
{
- int ret, fd, pid, status;
- char nobody_uid[] = "nobody";
- time_t atime;
- struct passwd *ltpuser;
- struct stat file_stat;
- char readbuf[20];
-
- switch (i) {
- case 0:
- /* Validate MS_RDONLY flag of mount call */
-
- snprintf(file, PATH_MAX, "%stmp", path_name);
- fd = open(file, O_CREAT | O_RDWR, S_IRWXU);
- if (fd == -1) {
- if (errno == EROFS) {
- return 0;
- } else {
- tst_resm(TWARN | TERRNO,
- "open didn't fail with EROFS");
- return 1;
- }
- }
- close(fd);
- return 1;
- case 1:
- /* Validate MS_NODEV flag of mount call */
-
- snprintf(file, PATH_MAX, "%smynod_%d_%d", path_name, getpid(),
- cnt);
- if (mknod(file, S_IFBLK | 0777, 0) == 0) {
- fd = open(file, O_RDWR, S_IRWXU);
- if (fd == -1) {
- if (errno == EACCES) {
- return 0;
- } else {
- tst_resm(TWARN | TERRNO,
- "open didn't fail with EACCES");
- return 1;
- }
- }
- close(fd);
- } else {
- tst_resm(TWARN | TERRNO, "mknod(2) failed to create %s",
- file);
- return 1;
- }
- return 1;
- case 2:
- /* Validate MS_NOEXEC flag of mount call */
-
- snprintf(file, PATH_MAX, "%stmp1", path_name);
- fd = open(file, O_CREAT | O_RDWR, S_IRWXU);
- if (fd == -1) {
- tst_resm(TWARN | TERRNO, "opening %s failed", file);
- } else {
- close(fd);
- ret = execlp(file, basename(file), NULL);
- if ((ret == -1) && (errno == EACCES))
- return 0;
- }
- return 1;
- case 3:
- /*
- * Validate MS_SYNCHRONOUS flag of mount call.
- * Copy some data into data buffer.
- */
-
- strcpy(write_buffer, "abcdefghijklmnopqrstuvwxyz");
-
- /* Creat a temporary file under above directory */
- snprintf(file, PATH_MAX, "%s%s", path_name, TEMP_FILE);
- fildes = open(file, O_RDWR | O_CREAT, FILE_MODE);
- if (fildes == -1) {
- tst_resm(TWARN | TERRNO,
- "open(%s, O_RDWR|O_CREAT, %#o) failed",
- file, FILE_MODE);
- return 1;
- }
-
- /* Write the buffer data into file */
- if (write(fildes, write_buffer, strlen(write_buffer)) !=
- (long)strlen(write_buffer)) {
- tst_resm(TWARN | TERRNO, "writing to %s failed", file);
- close(fildes);
- return 1;
- }
-
- /* Set the file ptr to b'nning of file */
- if (lseek(fildes, 0, SEEK_SET) < 0) {
- tst_resm(TWARN, "lseek() failed on %s, error="
- " %d", file, errno);
- close(fildes);
- return 1;
- }
+ /* Validate MS_NODEV flag of mount call */
+
+ snprintf(file, PATH_MAX, "%s/mynod_%d", MNTPOINT, getpid());
+ if (SAFE_MKNOD(file, S_IFBLK | 0777, 0) == 0) {
+ TST_EXP_FAIL2(open(file, O_RDWR, 0700),
+ EACCES, "mount(2) passed with flag MS_NODEV: "
+ "open fail with EACCES as expected");
+ otfd = TST_RET;
+ }
+ SAFE_UNLINK(file);
+}
- /* Read the contents of file */
- if (read(fildes, read_buffer, sizeof(read_buffer)) > 0) {
- if (strcmp(read_buffer, write_buffer)) {
- tst_resm(TWARN, "Data read from %s and written "
- "mismatch", file);
- close(fildes);
- return 1;
- } else {
- close(fildes);
- return 0;
- }
- } else {
- tst_resm(TWARN | TERRNO, "read() Fails on %s", file);
- close(fildes);
- return 1;
+static void test_noexec(void)
+{
+ /* Validate MS_NOEXEC flag of mount call */
+ int ret;
+
+ snprintf(file, PATH_MAX, "%s/tmp1", MNTPOINT);
+ TST_EXP_FD_SILENT(open(file, O_CREAT | O_RDWR, 0700),
+ "opening %s failed", file);
+ otfd = TST_RET;
+ if (otfd >= 0) {
+ SAFE_CLOSE(otfd);
+ ret = execlp(file, basename(file), NULL);
+ if ((ret == -1) && (errno == EACCES)) {
+ tst_res(TPASS, "mount(2) passed with flag MS_NOEXEC");
+ return;
}
+ }
+ tst_brk(TFAIL | TERRNO, "mount(2) failed with flag MS_NOEXEC");
+}
- case 4:
- /* Validate MS_REMOUNT flag of mount call */
-
- TEST(mount(device, mntpoint, fs_type, MS_REMOUNT, NULL));
- if (TEST_RETURN != 0) {
- tst_resm(TWARN | TTERRNO, "mount(2) failed to remount");
- return 1;
+static void test_ms_synchronous(void)
+{
+ /*
+ * Validate MS_SYNCHRONOUS flag of mount call.
+ * Copy some data into data buffer.
+ */
+
+ strcpy(write_buffer, "abcdefghijklmnopqrstuvwxyz");
+
+ /* Creat a temporary file under above directory */
+ snprintf(file, PATH_MAX, "%s/%s", MNTPOINT, TEMP_FILE);
+ TST_EXP_FD_SILENT(open(file, O_RDWR | O_CREAT, FILE_MODE),
+ "open(%s, O_RDWR|O_CREAT, %#o) failed",
+ file, FILE_MODE);
+ otfd = TST_RET;
+
+ /* Write the buffer data into file */
+ SAFE_WRITE(1, otfd, write_buffer, strlen(write_buffer));
+
+ /* Set the file ptr to b'nning of file */
+ SAFE_LSEEK(otfd, 0, SEEK_SET);
+
+ /* Read the contents of file */
+ if (SAFE_READ(0, otfd, read_buffer, sizeof(read_buffer)) > 0) {
+ if (strcmp(read_buffer, write_buffer)) {
+ tst_brk(TFAIL, "Data read from %s and written "
+ "mismatch", file);
} else {
- snprintf(file, PATH_MAX, "%stmp2", path_name);
- fd = open(file, O_CREAT | O_RDWR, S_IRWXU);
- if (fd == -1) {
- tst_resm(TWARN, "open(%s) on readonly "
- "filesystem passed", file);
- return 1;
- } else {
- close(fd);
- return 0;
- }
- }
- case 5:
- /* Validate MS_NOSUID flag of mount call */
-
- snprintf(file, PATH_MAX, "%smount03_setuid_test", path_name);
-
- pid = fork();
- switch (pid) {
- case -1:
- tst_resm(TBROK | TERRNO, "fork failed");
- return 1;
- case 0:
- ltpuser = getpwnam(nobody_uid);
- if (setreuid(ltpuser->pw_uid, ltpuser->pw_uid) == -1)
- tst_resm(TWARN | TERRNO,
- "seteuid() failed to change euid to %d",
- ltpuser->pw_uid);
-
- execlp(file, basename(file), NULL);
- exit(1);
- default:
- waitpid(pid, &status, 0);
- if (WIFEXITED(status)) {
- /* reset the setup_uid */
- if (status)
- return 0;
- }
- return 1;
- }
- case 6:
- /* Validate MS_NOATIME flag of mount call */
-
- snprintf(file, PATH_MAX, "%satime", path_name);
- fd = open(file, O_CREAT | O_RDWR, S_IRWXU);
- if (fd == -1) {
- tst_resm(TWARN | TERRNO, "opening %s failed", file);
- return 1;
- }
-
- if (write(fd, "TEST_MS_NOATIME", 15) != 15) {
- tst_resm(TWARN | TERRNO, "write %s failed", file);
- close(fd);
- return 1;
- }
-
- if (fstat(fd, &file_stat) == -1) {
- tst_resm(TWARN | TERRNO, "stat %s failed #1", file);
- close(fd);
- return 1;
- }
-
- atime = file_stat.st_atime;
-
- sleep(1);
-
- if (read(fd, readbuf, sizeof(readbuf)) == -1) {
- tst_resm(TWARN | TERRNO, "read %s failed", file);
- close(fd);
- return 1;
+ SAFE_CLOSE(otfd);
+ tst_res(TPASS, "mount(2) passed with flag MS_SYNCHRONOUS");
+ return;
}
+ } else {
+ tst_brk(TFAIL | TERRNO, "read() Fails on %s", file);
+ }
+}
- if (fstat(fd, &file_stat) == -1) {
- tst_resm(TWARN | TERRNO, "stat %s failed #2", file);
- close(fd);
- return 1;
- }
- close(fd);
-
- if (file_stat.st_atime != atime) {
- tst_resm(TWARN, "access time is updated");
- return 1;
- }
- return 0;
+static void test_ms_remount(void)
+{
+ /* Validate MS_REMOUNT flag of mount call */
+
+ TEST(mount(tst_device->dev, MNTPOINT, tst_device->fs_type, MS_REMOUNT, NULL));
+ if (TST_RET != 0) {
+ tst_brk(TFAIL | TTERRNO, "mount(2) failed to remount");
+ } else {
+ snprintf(file, PATH_MAX, "%s/tmp2", MNTPOINT);
+ TEST(open(file, O_CREAT | O_RDWR, 0700));
+ otfd = TST_RET;
+ if (otfd == -1) {
+ tst_res(TFAIL, "open(%s) on readonly "
+ "filesystem passed", file);
+ } else
+ tst_res(TPASS, "mount(2) passed with flag MS_REMOUNT");
}
- return 0;
}
-static void setup(void)
+static void test_ms_noatime(void)
{
- char path[PATH_MAX];
+ /* Validate MS_NOATIME flag of mount call */
+ time_t atime;
struct stat file_stat;
+ char readbuf[20];
- tst_sig(FORK, DEF_HANDLER, cleanup);
-
- tst_require_root();
-
- tst_tmpdir();
-
- fs_type = tst_dev_fs_type();
- device = tst_acquire_device(cleanup);
+ snprintf(file, PATH_MAX, "%s/atime", MNTPOINT);
+ TST_EXP_FD_SILENT(open(file, O_CREAT | O_RDWR, 0700));
+ otfd = TST_RET;
- if (!device)
- tst_brkm(TCONF, cleanup, "Failed to obtain block device");
+ SAFE_WRITE(1, otfd, "TEST_MS_NOATIME", 15);
- tst_mkfs(cleanup, device, fs_type, NULL, NULL);
+ SAFE_FSTAT(otfd, &file_stat);
- SAFE_MKDIR(cleanup, mntpoint, DIR_MODE);
+ atime = file_stat.st_atime;
- if (getcwd(path_name, sizeof(path_name)) == NULL)
- tst_brkm(TBROK, cleanup, "getcwd failed");
+ sleep(1);
- if (chmod(path_name, DIR_MODE) != 0)
- tst_brkm(TBROK, cleanup, "chmod(%s, %#o) failed",
- path_name, DIR_MODE);
+ SAFE_READ(0, otfd, readbuf, sizeof(readbuf));
- strncpy(path, path_name, PATH_MAX);
- snprintf(path_name, PATH_MAX, "%s/%s/", path, mntpoint);
+ SAFE_FSTAT(otfd, &file_stat);
- SAFE_MOUNT(cleanup, device, mntpoint, fs_type, 0, NULL);
- TST_RESOURCE_COPY(cleanup, "mount03_setuid_test", path_name);
+ if (file_stat.st_atime != atime) {
+ tst_res(TFAIL, "access time is updated");
+ return;
+ }
+ tst_res(TPASS, "mount(2) passed with flag MS_NOATIME");
+}
- snprintf(file, PATH_MAX, "%smount03_setuid_test", path_name);
- SAFE_STAT(cleanup, file, &file_stat);
+static void run(unsigned int n)
+{
+ struct tcase *tc = &tcases[n];
- if (file_stat.st_mode != SUID_MODE &&
- chmod(file, SUID_MODE) < 0)
- tst_brkm(TBROK, cleanup,
- "setuid for setuid_test failed");
- SAFE_UMOUNT(cleanup, mntpoint);
+ TEST(mount(tst_device->dev, MNTPOINT, tst_device->fs_type,
+ tc->flags, NULL));
+ if (tc->do_test)
+ tc->do_test();
- TEST_PAUSE;
+ if (otfd >= 0)
+ SAFE_CLOSE(otfd);
+ if (tst_is_mounted(MNTPOINT))
+ SAFE_UMOUNT(MNTPOINT);
}
static void cleanup(void)
{
- if (device)
- tst_release_device(device);
+ if (otfd > -1)
+ SAFE_CLOSE(otfd);
+}
+
+static void setup(void)
+{
+ struct stat file_stat = {0};
+ struct passwd *ltpuser = SAFE_GETPWNAM("nobody");
- tst_rmdir();
+ nobody_uid = ltpuser->pw_uid;
+ nobody_gid = ltpuser->pw_gid;
+ snprintf(file, PATH_MAX, "%s/mount03_setuid_test", MNTPOINT);
+ SAFE_STAT(MNTPOINT, &file_stat);
+ if (file_stat.st_mode != SUID_MODE &&
+ chmod(MNTPOINT, SUID_MODE) < 0)
+ tst_brk(TBROK, "setuid for setuid_test failed");
}
+
+static struct tst_test test = {
+ .tcnt = ARRAY_SIZE(tcases),
+ .test = run,
+ .setup = setup,
+ .cleanup = cleanup,
+ .needs_root = 1,
+ .format_device = 1,
+ .resource_files = (const char *const[]) {
+ "mount03_setuid_test",
+ NULL,
+ },
+ .forks_child = 1,
+ .mntpoint = MNTPOINT,
+ .all_filesystems = 1,
+ .skip_filesystems = (const char *const []){
+ "exfat",
+ "vfat",
+ "ntfs",
+ NULL
+ },
+};
Signed-off-by: Chen Hanxiao <chenhx.fnst@fujitsu.com> --- v2: use octal permissions remove long switch of test_rwflag skip vfat, exfat and ntfs testcases/kernel/syscalls/mount/mount03.c | 560 +++++++++------------- 1 file changed, 231 insertions(+), 329 deletions(-)