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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <sched.h>
#include <sys/mount.h>
#include <unistd.h>
#include "alloc-util.h"
#include "def.h"
#include "fd-util.h"
#include "fileio.h"
#include "hashmap.h"
#include "log.h"
#include "mountpoint-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "string-util.h"
#include "tests.h"
static void test_mount_propagation_flags(const char *name, int ret, unsigned long expected) {
long unsigned flags;
log_info("/* %s(%s) */", __func__, name);
assert_se(mount_propagation_flags_from_string(name, &flags) == ret);
if (ret >= 0) {
const char *c;
assert_se(flags == expected);
c = mount_propagation_flags_to_string(flags);
if (isempty(name))
assert_se(isempty(c));
else
assert_se(streq(c, name));
}
}
static void test_mnt_id(void) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_hashmap_free_free_ Hashmap *h = NULL;
char *p;
void *k;
int r;
log_info("/* %s */", __func__);
assert_se(f = fopen("/proc/self/mountinfo", "re"));
assert_se(h = hashmap_new(&trivial_hash_ops));
for (;;) {
_cleanup_free_ char *line = NULL, *path = NULL;
int mnt_id;
r = read_line(f, LONG_LINE_MAX, &line);
if (r == 0)
break;
assert_se(r > 0);
assert_se(sscanf(line, "%i %*s %*s %*s %ms", &mnt_id, &path) == 2);
#if HAS_FEATURE_MEMORY_SANITIZER
/* We don't know the length of the string, so we need to unpoison it one char at a time */
for (const char *c = path; ;c++) {
msan_unpoison(c, 1);
if (!*c)
break;
}
#endif
log_debug("mountinfo: %s → %i", path, mnt_id);
assert_se(hashmap_put(h, INT_TO_PTR(mnt_id), path) >= 0);
path = NULL;
}
HASHMAP_FOREACH_KEY(p, k, h) {
int mnt_id = PTR_TO_INT(k), mnt_id2;
r = path_get_mnt_id(p, &mnt_id2);
if (r < 0) {
log_debug_errno(r, "Failed to get the mnt id of %s: %m\n", p);
continue;
}
if (mnt_id == mnt_id2) {
log_debug("mnt ids of %s is %i\n", p, mnt_id);
continue;
} else
log_debug("mnt ids of %s are %i, %i\n", p, mnt_id, mnt_id2);
/* The ids don't match? If so, then there are two mounts on the same path, let's check if
* that's really the case */
char *t = hashmap_get(h, INT_TO_PTR(mnt_id2));
log_debug("the other path for mnt id %i is %s\n", mnt_id2, t);
assert_se(path_equal(p, t));
}
}
static void test_path_is_mount_point(void) {
int fd;
char tmp_dir[] = "/tmp/test-path-is-mount-point-XXXXXX";
_cleanup_free_ char *file1 = NULL, *file2 = NULL, *link1 = NULL, *link2 = NULL;
_cleanup_free_ char *dir1 = NULL, *dir1file = NULL, *dirlink1 = NULL, *dirlink1file = NULL;
_cleanup_free_ char *dir2 = NULL, *dir2file = NULL;
log_info("/* %s */", __func__);
assert_se(path_is_mount_point("/", NULL, AT_SYMLINK_FOLLOW) > 0);
assert_se(path_is_mount_point("/", NULL, 0) > 0);
assert_se(path_is_mount_point("//", NULL, AT_SYMLINK_FOLLOW) > 0);
assert_se(path_is_mount_point("//", NULL, 0) > 0);
assert_se(path_is_mount_point("/proc", NULL, AT_SYMLINK_FOLLOW) > 0);
assert_se(path_is_mount_point("/proc", NULL, 0) > 0);
assert_se(path_is_mount_point("/proc/", NULL, AT_SYMLINK_FOLLOW) > 0);
assert_se(path_is_mount_point("/proc/", NULL, 0) > 0);
assert_se(path_is_mount_point("/proc/1", NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point("/proc/1", NULL, 0) == 0);
assert_se(path_is_mount_point("/proc/1/", NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point("/proc/1/", NULL, 0) == 0);
assert_se(path_is_mount_point("/sys", NULL, AT_SYMLINK_FOLLOW) > 0);
assert_se(path_is_mount_point("/sys", NULL, 0) > 0);
assert_se(path_is_mount_point("/sys/", NULL, AT_SYMLINK_FOLLOW) > 0);
assert_se(path_is_mount_point("/sys/", NULL, 0) > 0);
/* we'll create a hierarchy of different kinds of dir/file/link
* layouts:
*
* <tmp>/file1, <tmp>/file2
* <tmp>/link1 -> file1, <tmp>/link2 -> file2
* <tmp>/dir1/
* <tmp>/dir1/file
* <tmp>/dirlink1 -> dir1
* <tmp>/dirlink1file -> dirlink1/file
* <tmp>/dir2/
* <tmp>/dir2/file
*/
/* file mountpoints */
assert_se(mkdtemp(tmp_dir) != NULL);
file1 = path_join(tmp_dir, "file1");
assert_se(file1);
file2 = path_join(tmp_dir, "file2");
assert_se(file2);
fd = open(file1, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
assert_se(fd > 0);
close(fd);
fd = open(file2, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
assert_se(fd > 0);
close(fd);
link1 = path_join(tmp_dir, "link1");
assert_se(link1);
assert_se(symlink("file1", link1) == 0);
link2 = path_join(tmp_dir, "link2");
assert_se(link1);
assert_se(symlink("file2", link2) == 0);
assert_se(path_is_mount_point(file1, NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point(file1, NULL, 0) == 0);
assert_se(path_is_mount_point(link1, NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point(link1, NULL, 0) == 0);
/* directory mountpoints */
dir1 = path_join(tmp_dir, "dir1");
assert_se(dir1);
assert_se(mkdir(dir1, 0755) == 0);
dirlink1 = path_join(tmp_dir, "dirlink1");
assert_se(dirlink1);
assert_se(symlink("dir1", dirlink1) == 0);
dirlink1file = path_join(tmp_dir, "dirlink1file");
assert_se(dirlink1file);
assert_se(symlink("dirlink1/file", dirlink1file) == 0);
dir2 = path_join(tmp_dir, "dir2");
assert_se(dir2);
assert_se(mkdir(dir2, 0755) == 0);
assert_se(path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point(dir1, NULL, 0) == 0);
assert_se(path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point(dirlink1, NULL, 0) == 0);
/* file in subdirectory mountpoints */
dir1file = path_join(dir1, "file");
assert_se(dir1file);
fd = open(dir1file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
assert_se(fd > 0);
close(fd);
assert_se(path_is_mount_point(dir1file, NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point(dir1file, NULL, 0) == 0);
assert_se(path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW) == 0);
assert_se(path_is_mount_point(dirlink1file, NULL, 0) == 0);
/* these tests will only work as root */
if (mount(file1, file2, NULL, MS_BIND, NULL) >= 0) {
int rf, rt, rdf, rdt, rlf, rlt, rl1f, rl1t;
const char *file2d;
/* files */
/* capture results in vars, to avoid dangling mounts on failure */
log_info("%s: %s", __func__, file2);
rf = path_is_mount_point(file2, NULL, 0);
rt = path_is_mount_point(file2, NULL, AT_SYMLINK_FOLLOW);
file2d = strjoina(file2, "/");
log_info("%s: %s", __func__, file2d);
rdf = path_is_mount_point(file2d, NULL, 0);
rdt = path_is_mount_point(file2d, NULL, AT_SYMLINK_FOLLOW);
log_info("%s: %s", __func__, link2);
rlf = path_is_mount_point(link2, NULL, 0);
rlt = path_is_mount_point(link2, NULL, AT_SYMLINK_FOLLOW);
assert_se(umount(file2) == 0);
assert_se(rf == 1);
assert_se(rt == 1);
assert_se(rdf == -ENOTDIR);
assert_se(rdt == -ENOTDIR);
assert_se(rlf == 0);
assert_se(rlt == 1);
/* dirs */
dir2file = path_join(dir2, "file");
assert_se(dir2file);
fd = open(dir2file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
assert_se(fd > 0);
close(fd);
assert_se(mount(dir2, dir1, NULL, MS_BIND, NULL) >= 0);
log_info("%s: %s", __func__, dir1);
rf = path_is_mount_point(dir1, NULL, 0);
rt = path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW);
log_info("%s: %s", __func__, dirlink1);
rlf = path_is_mount_point(dirlink1, NULL, 0);
rlt = path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW);
log_info("%s: %s", __func__, dirlink1file);
/* its parent is a mount point, but not /file itself */
rl1f = path_is_mount_point(dirlink1file, NULL, 0);
rl1t = path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW);
assert_se(umount(dir1) == 0);
assert_se(rf == 1);
assert_se(rt == 1);
assert_se(rlf == 0);
assert_se(rlt == 1);
assert_se(rl1f == 0);
assert_se(rl1t == 0);
} else
printf("Skipping bind mount file test: %m\n");
assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
}
int main(int argc, char *argv[]) {
test_setup_logging(LOG_DEBUG);
/* let's move into our own mount namespace with all propagation from the host turned off, so that
* /proc/self/mountinfo is static and constant for the whole time our test runs. */
if (unshare(CLONE_NEWNS) < 0) {
if (!ERRNO_IS_PRIVILEGE(errno))
return log_error_errno(errno, "Failed to detach mount namespace: %m");
log_notice("Lacking privilege to create separate mount namespace, proceeding in originating mount namespace.");
} else
assert_se(mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL) >= 0);
test_mount_propagation_flags("shared", 0, MS_SHARED);
test_mount_propagation_flags("slave", 0, MS_SLAVE);
test_mount_propagation_flags("private", 0, MS_PRIVATE);
test_mount_propagation_flags(NULL, 0, 0);
test_mount_propagation_flags("", 0, 0);
test_mount_propagation_flags("xxxx", -EINVAL, 0);
test_mount_propagation_flags(" ", -EINVAL, 0);
test_mnt_id();
test_path_is_mount_point();
return 0;
}
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