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test: add test for bind_remount_recursive()

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Lennart Poettering
2021-03-24 13:44:56 +01:00
parent 0338df47cf
commit 10cdbb8372
1 changed files with 65 additions and 0 deletions
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65
src/test/test-mount-util.c
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@@ -1,11 +1,20 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <sys/mount.h>
#include <sys/statvfs.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "mount-util.h"
#include "namespace-util.h"
#include "path-util.h"
#include "process-util.h"
#include "rm-rf.h"
#include "string-util.h"
#include "strv.h"
#include "tests.h"
#include "tmpfile-util.h"
static void test_mount_option_mangle(void) {
char *opts = NULL;
@@ -61,10 +70,66 @@ static void test_mount_option_mangle(void) {
assert_se(mount_option_mangle("rw,relatime,fmask=0022,dmask=0022,\"hogehoge", MS_RDONLY, &f, &opts) < 0);
}
static void test_bind_remount_recursive(void) {
_cleanup_(rm_rf_physical_and_freep) char *tmp = NULL;
_cleanup_free_ char *subdir = NULL;
const char *p;
if (geteuid() != 0) {
(void) log_tests_skipped("not running as root");
return;
}
assert_se(mkdtemp_malloc("/tmp/XXXXXX", &tmp) >= 0);
subdir = path_join(tmp, "subdir");
assert_se(subdir);
assert_se(mkdir(subdir, 0755) >= 0);
FOREACH_STRING(p, "/usr", "/sys", "/", tmp) {
pid_t pid;
pid = fork();
assert_se(pid >= 0);
if (pid == 0) {
struct statvfs svfs;
/* child */
assert_se(detach_mount_namespace() >= 0);
/* Check that the subdir is writable (it must be because it's in /tmp) */
assert_se(statvfs(subdir, &svfs) >= 0);
assert_se(!FLAGS_SET(svfs.f_flag, ST_RDONLY));
/* Make the subdir a bind mount */
assert_se(mount_nofollow(subdir, subdir, NULL, MS_BIND|MS_REC, NULL) >= 0);
/* Ensure it's still writable */
assert_se(statvfs(subdir, &svfs) >= 0);
assert_se(!FLAGS_SET(svfs.f_flag, ST_RDONLY));
/* Now mark the path we currently run for read-only */
assert_se(bind_remount_recursive(p, MS_RDONLY, MS_RDONLY, STRV_MAKE("/sys/kernel")) >= 0);
/* Ensure that this worked on the top-level */
assert_se(statvfs(p, &svfs) >= 0);
assert_se(FLAGS_SET(svfs.f_flag, ST_RDONLY));
/* And ensure this had an effect on the subdir exactly if we are talking about a path above the subdir */
assert_se(statvfs(subdir, &svfs) >= 0);
assert_se(FLAGS_SET(svfs.f_flag, ST_RDONLY) == !!path_startswith(subdir, p));
_exit(EXIT_SUCCESS);
}
assert_se(wait_for_terminate_and_check("test-remount-rec", pid, WAIT_LOG) == EXIT_SUCCESS);
}
}
int main(int argc, char *argv[]) {
test_setup_logging(LOG_DEBUG);
test_mount_option_mangle();
test_bind_remount_recursive();
return 0;
}