diff options
Diffstat (limited to 'src/test/test-mount-util.c')
| -rw-r--r-- | src/test/test-mount-util.c | 509 |
1 files changed, 509 insertions, 0 deletions
diff --git a/src/test/test-mount-util.c b/src/test/test-mount-util.c new file mode 100644 index 0000000..c3d0acb --- /dev/null +++ b/src/test/test-mount-util.c @@ -0,0 +1,509 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <sys/mount.h> +#include <sys/statvfs.h> + +#include "alloc-util.h" +#include "capability-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "fs-util.h" +#include "libmount-util.h" +#include "missing_magic.h" +#include "missing_mount.h" +#include "mkdir.h" +#include "mount-util.h" +#include "mountpoint-util.h" +#include "namespace-util.h" +#include "path-util.h" +#include "process-util.h" +#include "random-util.h" +#include "rm-rf.h" +#include "stat-util.h" +#include "string-util.h" +#include "strv.h" +#include "tests.h" +#include "tmpfile-util.h" + +TEST(mount_option_mangle) { + char *opts = NULL; + unsigned long f; + + assert_se(mount_option_mangle(NULL, MS_RDONLY|MS_NOSUID, &f, &opts) == 0); + assert_se(f == (MS_RDONLY|MS_NOSUID)); + assert_se(opts == NULL); + + assert_se(mount_option_mangle("", MS_RDONLY|MS_NOSUID, &f, &opts) == 0); + assert_se(f == (MS_RDONLY|MS_NOSUID)); + assert_se(opts == NULL); + + assert_se(mount_option_mangle("ro,nosuid,nodev,noexec", 0, &f, &opts) == 0); + assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC)); + assert_se(opts == NULL); + + assert_se(mount_option_mangle("ro,nosuid,nodev,noexec,mode=0755", 0, &f, &opts) == 0); + assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC)); + assert_se(streq(opts, "mode=0755")); + opts = mfree(opts); + + assert_se(mount_option_mangle("rw,nosuid,foo,hogehoge,nodev,mode=0755", 0, &f, &opts) == 0); + assert_se(f == (MS_NOSUID|MS_NODEV)); + assert_se(streq(opts, "foo,hogehoge,mode=0755")); + opts = mfree(opts); + + assert_se(mount_option_mangle("rw,nosuid,nodev,noexec,relatime,net_cls,net_prio", MS_RDONLY, &f, &opts) == 0); + assert_se(f == (MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_RELATIME)); + assert_se(streq(opts, "net_cls,net_prio")); + opts = mfree(opts); + + assert_se(mount_option_mangle("rw,nosuid,nodev,relatime,size=1630748k,mode=0700,uid=1000,gid=1000", MS_RDONLY, &f, &opts) == 0); + assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME)); + assert_se(streq(opts, "size=1630748k,mode=0700,uid=1000,gid=1000")); + opts = mfree(opts); + + assert_se(mount_option_mangle("size=1630748k,rw,gid=1000,,,nodev,relatime,,mode=0700,nosuid,uid=1000", MS_RDONLY, &f, &opts) == 0); + assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME)); + assert_se(streq(opts, "size=1630748k,gid=1000,mode=0700,uid=1000")); + opts = mfree(opts); + + assert_se(mount_option_mangle("rw,exec,size=8143984k,nr_inodes=2035996,mode=0755", MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, &f, &opts) == 0); + assert_se(f == (MS_NOSUID|MS_NODEV)); + assert_se(streq(opts, "size=8143984k,nr_inodes=2035996,mode=0755")); + opts = mfree(opts); + + assert_se(mount_option_mangle("rw,relatime,fmask=0022,,,dmask=0022", MS_RDONLY, &f, &opts) == 0); + assert_se(f == MS_RELATIME); + assert_se(streq(opts, "fmask=0022,dmask=0022")); + opts = mfree(opts); + + assert_se(mount_option_mangle("rw,relatime,fmask=0022,dmask=0022,\"hogehoge", MS_RDONLY, &f, &opts) < 0); + + assert_se(mount_option_mangle("mode=01777,size=10%,nr_inodes=400k,uid=496107520,gid=496107520,context=\"system_u:object_r:svirt_sandbox_file_t:s0:c0,c1\"", 0, &f, &opts) == 0); + assert_se(f == 0); + assert_se(streq(opts, "mode=01777,size=10%,nr_inodes=400k,uid=496107520,gid=496107520,context=\"system_u:object_r:svirt_sandbox_file_t:s0:c0,c1\"")); + opts = mfree(opts); +} + +static void test_mount_flags_to_string_one(unsigned long flags, const char *expected) { + _cleanup_free_ char *x = NULL; + int r; + + r = mount_flags_to_string(flags, &x); + log_info("flags: %#lX → %d/\"%s\"", flags, r, strnull(x)); + assert_se(r >= 0); + assert_se(streq(x, expected)); +} + +TEST(mount_flags_to_string) { + test_mount_flags_to_string_one(0, "0"); + test_mount_flags_to_string_one(MS_RDONLY, "MS_RDONLY"); + test_mount_flags_to_string_one(MS_NOSUID, "MS_NOSUID"); + test_mount_flags_to_string_one(MS_NODEV, "MS_NODEV"); + test_mount_flags_to_string_one(MS_NOEXEC, "MS_NOEXEC"); + test_mount_flags_to_string_one(MS_SYNCHRONOUS, "MS_SYNCHRONOUS"); + test_mount_flags_to_string_one(MS_REMOUNT, "MS_REMOUNT"); + test_mount_flags_to_string_one(MS_MANDLOCK, "MS_MANDLOCK"); + test_mount_flags_to_string_one(MS_DIRSYNC, "MS_DIRSYNC"); + test_mount_flags_to_string_one(MS_NOSYMFOLLOW, "MS_NOSYMFOLLOW"); + test_mount_flags_to_string_one(MS_NOATIME, "MS_NOATIME"); + test_mount_flags_to_string_one(MS_NODIRATIME, "MS_NODIRATIME"); + test_mount_flags_to_string_one(MS_BIND, "MS_BIND"); + test_mount_flags_to_string_one(MS_MOVE, "MS_MOVE"); + test_mount_flags_to_string_one(MS_REC, "MS_REC"); + test_mount_flags_to_string_one(MS_SILENT, "MS_SILENT"); + test_mount_flags_to_string_one(MS_POSIXACL, "MS_POSIXACL"); + test_mount_flags_to_string_one(MS_UNBINDABLE, "MS_UNBINDABLE"); + test_mount_flags_to_string_one(MS_PRIVATE, "MS_PRIVATE"); + test_mount_flags_to_string_one(MS_SLAVE, "MS_SLAVE"); + test_mount_flags_to_string_one(MS_SHARED, "MS_SHARED"); + test_mount_flags_to_string_one(MS_RELATIME, "MS_RELATIME"); + test_mount_flags_to_string_one(MS_KERNMOUNT, "MS_KERNMOUNT"); + test_mount_flags_to_string_one(MS_I_VERSION, "MS_I_VERSION"); + test_mount_flags_to_string_one(MS_STRICTATIME, "MS_STRICTATIME"); + test_mount_flags_to_string_one(MS_LAZYTIME, "MS_LAZYTIME"); + test_mount_flags_to_string_one(MS_LAZYTIME|MS_STRICTATIME, "MS_STRICTATIME|MS_LAZYTIME"); + test_mount_flags_to_string_one(UINT_MAX, + "MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS|MS_REMOUNT|" + "MS_MANDLOCK|MS_DIRSYNC|MS_NOSYMFOLLOW|MS_NOATIME|MS_NODIRATIME|" + "MS_BIND|MS_MOVE|MS_REC|MS_SILENT|MS_POSIXACL|MS_UNBINDABLE|" + "MS_PRIVATE|MS_SLAVE|MS_SHARED|MS_RELATIME|MS_KERNMOUNT|" + "MS_I_VERSION|MS_STRICTATIME|MS_LAZYTIME|fc000200"); +} + +TEST(bind_remount_recursive) { + _cleanup_(rm_rf_physical_and_freep) char *tmp = NULL; + _cleanup_free_ char *subdir = NULL; + + if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0) { + (void) log_tests_skipped("not running privileged"); + 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, path_equal(p, "/sys") ? STRV_MAKE("/sys/kernel") : NULL) >= 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); + } +} + +TEST(bind_remount_one) { + pid_t pid; + + if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0) { + (void) log_tests_skipped("not running privileged"); + return; + } + + pid = fork(); + assert_se(pid >= 0); + + if (pid == 0) { + /* child */ + + _cleanup_fclose_ FILE *proc_self_mountinfo = NULL; + + assert_se(detach_mount_namespace() >= 0); + + assert_se(fopen_unlocked("/proc/self/mountinfo", "re", &proc_self_mountinfo) >= 0); + + assert_se(bind_remount_one_with_mountinfo("/run", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) >= 0); + assert_se(bind_remount_one_with_mountinfo("/run", MS_NOEXEC, MS_RDONLY|MS_NOEXEC, proc_self_mountinfo) >= 0); + assert_se(bind_remount_one_with_mountinfo("/proc/idontexist", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) == -ENOENT); + assert_se(bind_remount_one_with_mountinfo("/proc/self", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) == -EINVAL); + assert_se(bind_remount_one_with_mountinfo("/", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) >= 0); + + _exit(EXIT_SUCCESS); + } + + assert_se(wait_for_terminate_and_check("test-remount-one", pid, WAIT_LOG) == EXIT_SUCCESS); +} + +TEST(make_mount_point_inode) { + _cleanup_(rm_rf_physical_and_freep) char *d = NULL; + const char *src_file, *src_dir, *dst_file, *dst_dir; + struct stat st; + + assert_se(mkdtemp_malloc(NULL, &d) >= 0); + + src_file = strjoina(d, "/src/file"); + src_dir = strjoina(d, "/src/dir"); + dst_file = strjoina(d, "/dst/file"); + dst_dir = strjoina(d, "/dst/dir"); + + assert_se(mkdir_p(src_dir, 0755) >= 0); + assert_se(mkdir_parents(dst_file, 0755) >= 0); + assert_se(touch(src_file) >= 0); + + assert_se(make_mount_point_inode_from_path(src_file, dst_file, 0755) >= 0); + assert_se(make_mount_point_inode_from_path(src_dir, dst_dir, 0755) >= 0); + + assert_se(stat(dst_dir, &st) == 0); + assert_se(S_ISDIR(st.st_mode)); + assert_se(stat(dst_file, &st) == 0); + assert_se(S_ISREG(st.st_mode)); + assert_se(!(S_IXUSR & st.st_mode)); + assert_se(!(S_IXGRP & st.st_mode)); + assert_se(!(S_IXOTH & st.st_mode)); + + assert_se(unlink(dst_file) == 0); + assert_se(rmdir(dst_dir) == 0); + + assert_se(stat(src_file, &st) == 0); + assert_se(make_mount_point_inode_from_stat(&st, dst_file, 0755) >= 0); + assert_se(stat(src_dir, &st) == 0); + assert_se(make_mount_point_inode_from_stat(&st, dst_dir, 0755) >= 0); + + assert_se(stat(dst_dir, &st) == 0); + assert_se(S_ISDIR(st.st_mode)); + assert_se(stat(dst_file, &st) == 0); + assert_se(S_ISREG(st.st_mode)); + assert_se(!(S_IXUSR & st.st_mode)); + assert_se(!(S_IXGRP & st.st_mode)); + assert_se(!(S_IXOTH & st.st_mode)); +} + +TEST(make_mount_switch_root) { + _cleanup_(rm_rf_physical_and_freep) char *t = NULL; + _cleanup_free_ char *s = NULL; + int r; + + if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0) { + (void) log_tests_skipped("not running privileged"); + return; + } + + assert_se(mkdtemp_malloc(NULL, &t) >= 0); + + assert_se(asprintf(&s, "%s/somerandomname%" PRIu64, t, random_u64()) >= 0); + assert_se(s); + assert_se(touch(s) >= 0); + + for (int force_ms_move = 0; force_ms_move < 2; force_ms_move++) { + r = safe_fork("(switch-root)", + FORK_RESET_SIGNALS | + FORK_CLOSE_ALL_FDS | + FORK_DEATHSIG_SIGTERM | + FORK_WAIT | + FORK_REOPEN_LOG | + FORK_LOG | + FORK_NEW_MOUNTNS | + FORK_MOUNTNS_SLAVE, + NULL); + assert_se(r >= 0); + + if (r == 0) { + assert_se(make_mount_point(t) >= 0); + assert_se(mount_switch_root_full(t, /* mount_propagation_flag= */ 0, force_ms_move) >= 0); + + assert_se(access(ASSERT_PTR(strrchr(s, '/')), F_OK) >= 0); /* absolute */ + assert_se(access(ASSERT_PTR(strrchr(s, '/')) + 1, F_OK) >= 0); /* relative */ + assert_se(access(s, F_OK) < 0 && errno == ENOENT); /* doesn't exist in our new environment */ + + _exit(EXIT_SUCCESS); + } + } +} + +TEST(umount_recursive) { + static const struct { + const char *prefix; + const char * const keep[3]; + } test_table[] = { + { + .prefix = NULL, + .keep = {}, + }, + { + .prefix = "/run", + .keep = {}, + }, + { + .prefix = NULL, + .keep = { "/dev/shm", NULL }, + }, + { + .prefix = "/dev", + .keep = { "/dev/pts", "/dev/shm", NULL }, + }, + }; + + int r; + + FOREACH_ARRAY(t, test_table, ELEMENTSOF(test_table)) { + + r = safe_fork("(umount-rec)", + FORK_RESET_SIGNALS | + FORK_CLOSE_ALL_FDS | + FORK_DEATHSIG_SIGTERM | + FORK_WAIT | + FORK_REOPEN_LOG | + FORK_LOG | + FORK_NEW_MOUNTNS | + FORK_MOUNTNS_SLAVE, + NULL); + + if (ERRNO_IS_NEG_PRIVILEGE(r)) + return (void) log_notice("Skipping umount_recursive() test, lacking privileges"); + + assert_se(r >= 0); + if (r == 0) { /* child */ + _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL; + _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL; + _cleanup_fclose_ FILE *f = NULL; + _cleanup_free_ char *k = NULL; + + /* Open /p/s/m file before we unmount everything (which might include /proc/) */ + f = fopen("/proc/self/mountinfo", "re"); + if (!f) { + log_error_errno(errno, "Failed to open /proc/self/mountinfo: %m"); + _exit(EXIT_FAILURE); + } + + assert_se(k = strv_join((char**) t->keep, " ")); + log_info("detaching just %s (keep: %s)", strna(t->prefix), strna(empty_to_null(k))); + + assert_se(umount_recursive_full(t->prefix, MNT_DETACH, (char**) t->keep) >= 0); + + r = libmount_parse("/proc/self/mountinfo", f, &table, &iter); + if (r < 0) { + log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m"); + _exit(EXIT_FAILURE); + } + + for (;;) { + struct libmnt_fs *fs; + + r = mnt_table_next_fs(table, iter, &fs); + if (r == 1) + break; + if (r < 0) { + log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m"); + _exit(EXIT_FAILURE); + } + + log_debug("left after complete umount: %s", mnt_fs_get_target(fs)); + } + + _exit(EXIT_SUCCESS); + } + } +} + +TEST(fd_make_mount_point) { + _cleanup_(rm_rf_physical_and_freep) char *t = NULL; + _cleanup_free_ char *s = NULL; + int r; + + if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0) { + (void) log_tests_skipped("not running privileged"); + return; + } + + assert_se(mkdtemp_malloc(NULL, &t) >= 0); + + assert_se(asprintf(&s, "%s/somerandomname%" PRIu64, t, random_u64()) >= 0); + assert_se(s); + assert_se(mkdir(s, 0700) >= 0); + + r = safe_fork("(make_mount-point)", + FORK_RESET_SIGNALS | + FORK_CLOSE_ALL_FDS | + FORK_DEATHSIG_SIGTERM | + FORK_WAIT | + FORK_REOPEN_LOG | + FORK_LOG | + FORK_NEW_MOUNTNS | + FORK_MOUNTNS_SLAVE, + NULL); + assert_se(r >= 0); + + if (r == 0) { + _cleanup_close_ int fd = -EBADF, fd2 = -EBADF; + + fd = open(s, O_PATH|O_CLOEXEC); + assert_se(fd >= 0); + + assert_se(fd_is_mount_point(fd, NULL, AT_SYMLINK_FOLLOW) == 0); + + assert_se(fd_make_mount_point(fd) > 0); + + /* Reopen the inode so that we end up on the new mount */ + fd2 = open(s, O_PATH|O_CLOEXEC); + + assert_se(fd_is_mount_point(fd2, NULL, AT_SYMLINK_FOLLOW) > 0); + + assert_se(fd_make_mount_point(fd2) == 0); + + _exit(EXIT_SUCCESS); + } +} + +TEST(bind_mount_submounts) { + _cleanup_(rmdir_and_freep) char *a = NULL, *b = NULL; + _cleanup_free_ char *x = NULL; + int r; + + assert_se(mkdtemp_malloc(NULL, &a) >= 0); + r = mount_nofollow_verbose(LOG_INFO, "tmpfs", a, "tmpfs", 0, NULL); + if (ERRNO_IS_NEG_PRIVILEGE(r)) + return (void) log_tests_skipped("Skipping bind_mount_submounts() test, lacking privileges"); + + assert_se(r >= 0); + + assert_se(x = path_join(a, "foo")); + assert_se(touch(x) >= 0); + free(x); + + assert_se(x = path_join(a, "x")); + assert_se(mkdir(x, 0755) >= 0); + assert_se(mount_nofollow_verbose(LOG_INFO, "tmpfs", x, "tmpfs", 0, NULL) >= 0); + free(x); + + assert_se(x = path_join(a, "x/xx")); + assert_se(touch(x) >= 0); + free(x); + + assert_se(x = path_join(a, "y")); + assert_se(mkdir(x, 0755) >= 0); + assert_se(mount_nofollow_verbose(LOG_INFO, "tmpfs", x, "tmpfs", 0, NULL) >= 0); + free(x); + + assert_se(x = path_join(a, "y/yy")); + assert_se(touch(x) >= 0); + free(x); + + assert_se(mkdtemp_malloc(NULL, &b) >= 0); + assert_se(mount_nofollow_verbose(LOG_INFO, "tmpfs", b, "tmpfs", 0, NULL) >= 0); + + assert_se(x = path_join(b, "x")); + assert_se(mkdir(x, 0755) >= 0); + free(x); + + assert_se(x = path_join(b, "y")); + assert_se(mkdir(x, 0755) >= 0); + free(x); + + assert_se(bind_mount_submounts(a, b) >= 0); + + assert_se(x = path_join(b, "foo")); + assert_se(access(x, F_OK) < 0 && errno == ENOENT); + free(x); + + assert_se(x = path_join(b, "x/xx")); + assert_se(access(x, F_OK) >= 0); + free(x); + + assert_se(x = path_join(b, "y/yy")); + assert_se(access(x, F_OK) >= 0); + free(x); + + assert_se(x = path_join(b, "x")); + assert_se(path_is_mount_point(x, NULL, 0) > 0); + free(x); + + assert_se(x = path_join(b, "y")); + assert_se(path_is_mount_point(x, NULL, 0) > 0); + + assert_se(umount_recursive(a, 0) >= 0); + assert_se(umount_recursive(b, 0) >= 0); +} + +DEFINE_TEST_MAIN(LOG_DEBUG); 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