* [PATCH v4 7/8] generic/641: add nested user namespace tests
2021-08-14 10:47 [PATCH v4 0/8] Extend idmapped mount testsuite Christian Brauner
` (5 preceding siblings ...)
2021-08-14 10:48 ` [PATCH v4 6/8] idmapped-mounts: add nested userns creation helpers Christian Brauner
@ 2021-08-14 10:48 ` Christian Brauner
2021-08-14 10:48 ` [PATCH v4 8/8] btrfs/244: introduce btrfs specific idmapped mounts tests Christian Brauner
2021-08-15 16:46 ` [PATCH v4 0/8] Extend idmapped mount testsuite Christian Brauner
8 siblings, 0 replies; 13+ messages in thread
From: Christian Brauner @ 2021-08-14 10:48 UTC (permalink / raw)
To: fstests, Eryu Guan, Christoph Hellwig; +Cc: Christian Brauner
From: Christian Brauner <christian.brauner@ubuntu.com>
Test ownership and ownership changes in a complex user namespace
hierarchy.
Cc: fstests@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
- Eryu Guan <guan@eryu.me>:
- Don't create symlinks for each test. Instead, use the same binary
and introduce new options to specify which tests to run.
/* v3 */
unchanged
/* v4 */
unchanged
---
src/idmapped-mounts/idmapped-mounts.c | 724 +++++++++++++++++++++++++-
src/idmapped-mounts/utils.h | 4 +
tests/generic/641 | 28 +
tests/generic/641.out | 2 +
4 files changed, 757 insertions(+), 1 deletion(-)
create mode 100755 tests/generic/641
create mode 100644 tests/generic/641.out
diff --git a/src/idmapped-mounts/idmapped-mounts.c b/src/idmapped-mounts/idmapped-mounts.c
index fdbdd827..1e7c25aa 100644
--- a/src/idmapped-mounts/idmapped-mounts.c
+++ b/src/idmapped-mounts/idmapped-mounts.c
@@ -8812,6 +8812,714 @@ out:
return fret;
}
+static int nested_userns(void)
+{
+ int fret = -1;
+ int ret;
+ pid_t pid;
+ struct list *it, *next;
+ struct userns_hierarchy hierarchy[] = {
+ { .level = 1, .fd_userns = -EBADF, },
+ { .level = 2, .fd_userns = -EBADF, },
+ { .level = 3, .fd_userns = -EBADF, },
+ { .level = 4, .fd_userns = -EBADF, },
+ /* Dummy entry that marks the end. */
+ { .level = MAX_USERNS_LEVEL, .fd_userns = -EBADF, },
+ };
+ struct mount_attr attr_level1 = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ .userns_fd = -EBADF,
+ };
+ struct mount_attr attr_level2 = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ .userns_fd = -EBADF,
+ };
+ struct mount_attr attr_level3 = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ .userns_fd = -EBADF,
+ };
+ struct mount_attr attr_level4 = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ .userns_fd = -EBADF,
+ };
+ int fd_dir1 = -EBADF,
+ fd_open_tree_level1 = -EBADF,
+ fd_open_tree_level2 = -EBADF,
+ fd_open_tree_level3 = -EBADF,
+ fd_open_tree_level4 = -EBADF;
+ const unsigned int id_file_range = 10000;
+
+ list_init(&hierarchy[0].id_map);
+ list_init(&hierarchy[1].id_map);
+ list_init(&hierarchy[2].id_map);
+ list_init(&hierarchy[3].id_map);
+
+ /*
+ * Give a large map to the outermost user namespace so we can create
+ * comfortable nested maps.
+ */
+ ret = add_map_entry(&hierarchy[0].id_map, 1000000, 0, 1000000000, ID_TYPE_UID);
+ if (ret) {
+ log_stderr("failure: adding uidmap for userns at level 1");
+ goto out;
+ }
+
+ ret = add_map_entry(&hierarchy[0].id_map, 1000000, 0, 1000000000, ID_TYPE_GID);
+ if (ret) {
+ log_stderr("failure: adding gidmap for userns at level 1");
+ goto out;
+ }
+
+ /* This is uid:0->2000000:100000000 in init userns. */
+ ret = add_map_entry(&hierarchy[1].id_map, 1000000, 0, 100000000, ID_TYPE_UID);
+ if (ret) {
+ log_stderr("failure: adding uidmap for userns at level 2");
+ goto out;
+ }
+
+ /* This is gid:0->2000000:100000000 in init userns. */
+ ret = add_map_entry(&hierarchy[1].id_map, 1000000, 0, 100000000, ID_TYPE_GID);
+ if (ret) {
+ log_stderr("failure: adding gidmap for userns at level 2");
+ goto out;
+ }
+
+ /* This is uid:0->3000000:999 in init userns. */
+ ret = add_map_entry(&hierarchy[2].id_map, 1000000, 0, 999, ID_TYPE_UID);
+ if (ret) {
+ log_stderr("failure: adding uidmap for userns at level 3");
+ goto out;
+ }
+
+ /* This is gid:0->3000000:999 in the init userns. */
+ ret = add_map_entry(&hierarchy[2].id_map, 1000000, 0, 999, ID_TYPE_GID);
+ if (ret) {
+ log_stderr("failure: adding gidmap for userns at level 3");
+ goto out;
+ }
+
+ /* id 999 will remain unmapped. */
+
+ /* This is uid:1000->2001000:1 in init userns. */
+ ret = add_map_entry(&hierarchy[2].id_map, 1000, 1000, 1, ID_TYPE_UID);
+ if (ret) {
+ log_stderr("failure: adding uidmap for userns at level 3");
+ goto out;
+ }
+
+ /* This is gid:1000->2001000:1 in init userns. */
+ ret = add_map_entry(&hierarchy[2].id_map, 1000, 1000, 1, ID_TYPE_GID);
+ if (ret) {
+ log_stderr("failure: adding gidmap for userns at level 3");
+ goto out;
+ }
+
+ /* This is uid:1001->3001001:10000 in init userns. */
+ ret = add_map_entry(&hierarchy[2].id_map, 1001001, 1001, 10000000, ID_TYPE_UID);
+ if (ret) {
+ log_stderr("failure: adding uidmap for userns at level 3");
+ goto out;
+ }
+
+ /* This is gid:1001->3001001:10000 in init userns. */
+ ret = add_map_entry(&hierarchy[2].id_map, 1001001, 1001, 10000000, ID_TYPE_GID);
+ if (ret) {
+ log_stderr("failure: adding gidmap for userns at level 3");
+ goto out;
+ }
+
+ /* Don't write a mapping in the 4th userns. */
+ list_empty(&hierarchy[4].id_map);
+
+ /* Create the actual userns hierarchy. */
+ ret = create_userns_hierarchy(hierarchy);
+ if (ret) {
+ log_stderr("failure: create userns hierarchy");
+ goto out;
+ }
+
+ attr_level1.userns_fd = hierarchy[0].fd_userns;
+ attr_level2.userns_fd = hierarchy[1].fd_userns;
+ attr_level3.userns_fd = hierarchy[2].fd_userns;
+ attr_level4.userns_fd = hierarchy[3].fd_userns;
+
+ /*
+ * Create one directory where we create files for each uid/gid within
+ * the first userns.
+ */
+ if (mkdirat(t_dir1_fd, DIR1, 0777)) {
+ log_stderr("failure: mkdirat");
+ goto out;
+ }
+
+ fd_dir1 = openat(t_dir1_fd, DIR1, O_DIRECTORY | O_CLOEXEC);
+ if (fd_dir1 < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ char file[256];
+
+ snprintf(file, sizeof(file), DIR1 "/" FILE1 "_%u", id);
+
+ if (mknodat(t_dir1_fd, file, S_IFREG | 0644, 0)) {
+ log_stderr("failure: create %s", file);
+ goto out;
+ }
+
+ if (fchownat(t_dir1_fd, file, id, id, AT_SYMLINK_NOFOLLOW)) {
+ log_stderr("failure: fchownat %s", file);
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, file, 0, id, id)) {
+ log_stderr("failure: check ownership %s", file);
+ goto out;
+ }
+ }
+
+ /* Create detached mounts for all the user namespaces. */
+ fd_open_tree_level1 = sys_open_tree(t_dir1_fd, DIR1,
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (fd_open_tree_level1 < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ fd_open_tree_level2 = sys_open_tree(t_dir1_fd, DIR1,
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (fd_open_tree_level2 < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ fd_open_tree_level3 = sys_open_tree(t_dir1_fd, DIR1,
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (fd_open_tree_level3 < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ fd_open_tree_level4 = sys_open_tree(t_dir1_fd, DIR1,
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (fd_open_tree_level4 < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ /* Turn detached mounts into detached idmapped mounts. */
+ if (sys_mount_setattr(fd_open_tree_level1, "", AT_EMPTY_PATH,
+ &attr_level1, sizeof(attr_level1))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ if (sys_mount_setattr(fd_open_tree_level2, "", AT_EMPTY_PATH,
+ &attr_level2, sizeof(attr_level2))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ if (sys_mount_setattr(fd_open_tree_level3, "", AT_EMPTY_PATH,
+ &attr_level3, sizeof(attr_level3))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ if (sys_mount_setattr(fd_open_tree_level4, "", AT_EMPTY_PATH,
+ &attr_level4, sizeof(attr_level4))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /* Verify that ownership looks correct for callers in the init userns. */
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ bool bret;
+ unsigned int id_level1, id_level2, id_level3;
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ id_level1 = id + 1000000;
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, id_level1, id_level1)) {
+ log_stderr("failure: check ownership %s", file);
+ goto out;
+ }
+
+ id_level2 = id + 2000000;
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, id_level2, id_level2)) {
+ log_stderr("failure: check ownership %s", file);
+ goto out;
+ }
+
+ if (id == 999) {
+ /* This id is unmapped. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid);
+ } else if (id == 1000) {
+ id_level3 = id + 2000000; /* We punched a hole in the map at 1000. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ } else {
+ id_level3 = id + 3000000; /* Rest is business as usual. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ }
+ if (!bret) {
+ log_stderr("failure: check ownership %s", file);
+ goto out;
+ }
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid)) {
+ log_stderr("failure: check ownership %s", file);
+ goto out;
+ }
+ }
+
+ /* Verify that ownership looks correct for callers in the first userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr_level1.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ bool bret;
+ unsigned int id_level1, id_level2, id_level3;
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ id_level1 = id;
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, id_level1, id_level1))
+ die("failure: check ownership %s", file);
+
+ id_level2 = id + 1000000;
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, id_level2, id_level2))
+ die("failure: check ownership %s", file);
+
+ if (id == 999) {
+ /* This id is unmapped. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid);
+ } else if (id == 1000) {
+ id_level3 = id + 1000000; /* We punched a hole in the map at 1000. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ } else {
+ id_level3 = id + 2000000; /* Rest is business as usual. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ }
+ if (!bret)
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* Verify that ownership looks correct for callers in the second userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr_level2.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ bool bret;
+ unsigned int id_level2, id_level3;
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ id_level2 = id;
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, id_level2, id_level2))
+ die("failure: check ownership %s", file);
+
+ if (id == 999) {
+ /* This id is unmapped. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid);
+ } else if (id == 1000) {
+ id_level3 = id; /* We punched a hole in the map at 1000. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ } else {
+ id_level3 = id + 1000000; /* Rest is business as usual. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ }
+ if (!bret)
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* Verify that ownership looks correct for callers in the third userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr_level3.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ bool bret;
+ unsigned int id_level2, id_level3;
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (id == 1000) {
+ /*
+ * The idmapping of the third userns has a hole
+ * at uid/gid 1000. That means:
+ * - 1000->userns_0(2000000) // init userns
+ * - 1000->userns_1(2000000) // level 1
+ * - 1000->userns_2(1000000) // level 2
+ * - 1000->userns_3(1000) // level 3 (because level 3 has a hole)
+ */
+ id_level2 = id;
+ bret = expected_uid_gid(fd_open_tree_level2, file, 0, id_level2, id_level2);
+ } else {
+ bret = expected_uid_gid(fd_open_tree_level2, file, 0, t_overflowuid, t_overflowgid);
+ }
+ if (!bret)
+ die("failure: check ownership %s", file);
+
+
+ if (id == 999) {
+ /* This id is unmapped. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid);
+ } else {
+ id_level3 = id; /* Rest is business as usual. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ }
+ if (!bret)
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* Verify that ownership looks correct for callers in the fourth userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (setns(attr_level4.userns_fd, CLONE_NEWUSER))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* Verify that chown works correctly for callers in the first userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr_level1.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ bool bret;
+ unsigned int id_level1, id_level2, id_level3, id_new;
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ id_new = id + 1;
+ if (fchownat(fd_open_tree_level1, file, id_new, id_new, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+
+ id_level1 = id_new;
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, id_level1, id_level1))
+ die("failure: check ownership %s", file);
+
+ id_level2 = id_new + 1000000;
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, id_level2, id_level2))
+ die("failure: check ownership %s", file);
+
+ if (id_new == 999) {
+ /* This id is unmapped. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid);
+ } else if (id_new == 1000) {
+ id_level3 = id_new + 1000000; /* We punched a hole in the map at 1000. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ } else {
+ id_level3 = id_new + 2000000; /* Rest is business as usual. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ }
+ if (!bret)
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ /* Revert ownership. */
+ if (fchownat(fd_open_tree_level1, file, id, id, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* Verify that chown works correctly for callers in the second userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr_level2.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ bool bret;
+ unsigned int id_level2, id_level3, id_new;
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ id_new = id + 1;
+ if (fchownat(fd_open_tree_level2, file, id_new, id_new, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ id_level2 = id_new;
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, id_level2, id_level2))
+ die("failure: check ownership %s", file);
+
+ if (id_new == 999) {
+ /* This id is unmapped. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid);
+ } else if (id_new == 1000) {
+ id_level3 = id_new; /* We punched a hole in the map at 1000. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ } else {
+ id_level3 = id_new + 1000000; /* Rest is business as usual. */
+ bret = expected_uid_gid(fd_open_tree_level3, file, 0, id_level3, id_level3);
+ }
+ if (!bret)
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ /* Revert ownership. */
+ if (fchownat(fd_open_tree_level2, file, id, id, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* Verify that chown works correctly for callers in the third userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr_level3.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ unsigned int id_new;
+ char file[256];
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ id_new = id + 1;
+ if (id_new == 999 || id_new == 1000) {
+ /*
+ * We can't change ownership as we can't
+ * chown from or to an unmapped id.
+ */
+ if (!fchownat(fd_open_tree_level3, file, id_new, id_new, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+ } else {
+ if (fchownat(fd_open_tree_level3, file, id_new, id_new, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+ }
+
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ /* There's no id 1000 anymore as we changed ownership for id 1000 to 1001 above. */
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (id_new == 999) {
+ /*
+ * We did not change ownership as we can't
+ * chown to an unmapped id.
+ */
+ if (!expected_uid_gid(fd_open_tree_level3, file, 0, id, id))
+ die("failure: check ownership %s", file);
+ } else if (id_new == 1000) {
+ /*
+ * We did not change ownership as we can't
+ * chown from an unmapped id.
+ */
+ if (!expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+ } else {
+ if (!expected_uid_gid(fd_open_tree_level3, file, 0, id_new, id_new))
+ die("failure: check ownership %s", file);
+ }
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ /* Revert ownership. */
+ if (id_new != 999 && id_new != 1000) {
+ if (fchownat(fd_open_tree_level3, file, id, id, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+ }
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* Verify that chown works correctly for callers in the fourth userns. */
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (setns(attr_level4.userns_fd, CLONE_NEWUSER))
+ die("failure: switch_userns");
+
+ for (unsigned int id = 0; id <= id_file_range; id++) {
+ char file[256];
+ unsigned long id_new;
+
+ snprintf(file, sizeof(file), FILE1 "_%u", id);
+
+ id_new = id + 1;
+ if (!fchownat(fd_open_tree_level4, file, id_new, id_new, AT_SYMLINK_NOFOLLOW))
+ die("failure: fchownat %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level1, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level2, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level3, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ if (!expected_uid_gid(fd_open_tree_level4, file, 0, t_overflowuid, t_overflowgid))
+ die("failure: check ownership %s", file);
+
+ }
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+
+out:
+ list_for_each_safe(it, &hierarchy[0].id_map, next) {
+ list_del(it);
+ free(it->elem);
+ free(it);
+ }
+
+ list_for_each_safe(it, &hierarchy[1].id_map, next) {
+ list_del(it);
+ free(it->elem);
+ free(it);
+ }
+
+ list_for_each_safe(it, &hierarchy[2].id_map, next) {
+ list_del(it);
+ free(it->elem);
+ free(it);
+ }
+
+ safe_close(hierarchy[0].fd_userns);
+ safe_close(hierarchy[1].fd_userns);
+ safe_close(hierarchy[2].fd_userns);
+ safe_close(fd_dir1);
+ safe_close(fd_open_tree_level1);
+ safe_close(fd_open_tree_level2);
+ safe_close(fd_open_tree_level3);
+ safe_close(fd_open_tree_level4);
+ return fret;
+}
+
static void usage(void)
{
fprintf(stderr, "Description:\n");
@@ -8825,6 +9533,7 @@ static void usage(void)
fprintf(stderr, "--supported Test whether idmapped mounts are supported on this filesystem\n");
fprintf(stderr, "--test-core Run core idmapped mount testsuite\n");
fprintf(stderr, "--test-fscaps-regression Run fscap regression tests\n");
+ fprintf(stderr, "--test-nested-userns Run nested userns idmapped mount testsuite\n");
_exit(EXIT_SUCCESS);
}
@@ -8837,6 +9546,7 @@ static const struct option longopts[] = {
{"help", no_argument, 0, 'h'},
{"test-core", no_argument, 0, 'c'},
{"test-fscaps-regression", no_argument, 0, 'g'},
+ {"test-nested-userns", no_argument, 0, 'n'},
{NULL, 0, 0, 0},
};
@@ -8899,6 +9609,10 @@ struct t_idmapped_mounts fscaps_in_ancestor_userns[] = {
{ fscaps_idmapped_mounts_in_userns_valid_in_ancestor_userns, "fscaps on idmapped mounts in user namespace writing fscap valid in ancestor userns", },
};
+struct t_idmapped_mounts t_nested_userns[] = {
+ { nested_userns, "test that nested user namespaces behave correctly when attached to idmapped mounts", },
+};
+
static bool run_test(struct t_idmapped_mounts suite[], size_t suite_size)
{
int i;
@@ -8936,7 +9650,8 @@ int main(int argc, char *argv[])
{
int fret, ret;
int index = 0;
- bool supported = false, test_core = false, test_fscaps_regression = false;
+ bool supported = false, test_core = false,
+ test_fscaps_regression = false, test_nested_userns = false;
while ((ret = getopt_long_only(argc, argv, "", longopts, &index)) != -1) {
switch (ret) {
@@ -8958,6 +9673,9 @@ int main(int argc, char *argv[])
case 'g':
test_fscaps_regression = true;
break;
+ case 'n':
+ test_nested_userns = true;
+ break;
case 'h':
/* fallthrough */
default:
@@ -9035,6 +9753,10 @@ int main(int argc, char *argv[])
ARRAY_SIZE(fscaps_in_ancestor_userns)))
goto out;
+ if (test_nested_userns &&
+ !run_test(t_nested_userns, ARRAY_SIZE(t_nested_userns)))
+ goto out;
+
fret = EXIT_SUCCESS;
out:
diff --git a/src/idmapped-mounts/utils.h b/src/idmapped-mounts/utils.h
index 9694980e..afb3c228 100644
--- a/src/idmapped-mounts/utils.h
+++ b/src/idmapped-mounts/utils.h
@@ -77,6 +77,10 @@ struct userns_hierarchy {
#define list_for_each(__iterator, __list) \
for (__iterator = (__list)->next; __iterator != __list; __iterator = __iterator->next)
+#define list_for_each_safe(__iterator, __list, __next) \
+ for (__iterator = (__list)->next, __next = __iterator->next; \
+ __iterator != __list; __iterator = __next, __next = __next->next)
+
static inline void list_init(struct list *list)
{
list->elem = NULL;
diff --git a/tests/generic/641 b/tests/generic/641
new file mode 100755
index 00000000..a3a41f02
--- /dev/null
+++ b/tests/generic/641
@@ -0,0 +1,28 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2021 Christian Brauner. All Rights Reserved.
+#
+# FS QA Test 641
+#
+# Test that idmapped mounts behave correctly with complex user namespaces.
+#
+. ./common/preamble
+_begin_fstest auto quick idmapped mount
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+
+_supported_fs generic
+_require_idmapped_mounts
+_require_test
+
+echo "Silence is golden"
+
+$here/src/idmapped-mounts/idmapped-mounts --test-nested-userns \
+ --device "$TEST_DEV" --mount "$TEST_DIR" --fstype "$FSTYP"
+
+status=$?
+exit
diff --git a/tests/generic/641.out b/tests/generic/641.out
new file mode 100644
index 00000000..216333fd
--- /dev/null
+++ b/tests/generic/641.out
@@ -0,0 +1,2 @@
+QA output created by 641
+Silence is golden
--
2.30.2
^ permalink raw reply related [flat|nested] 13+ messages in thread* [PATCH v4 8/8] btrfs/244: introduce btrfs specific idmapped mounts tests
2021-08-14 10:47 [PATCH v4 0/8] Extend idmapped mount testsuite Christian Brauner
` (6 preceding siblings ...)
2021-08-14 10:48 ` [PATCH v4 7/8] generic/641: add nested user namespace tests Christian Brauner
@ 2021-08-14 10:48 ` Christian Brauner
2021-08-15 16:46 ` [PATCH v4 0/8] Extend idmapped mount testsuite Christian Brauner
8 siblings, 0 replies; 13+ messages in thread
From: Christian Brauner @ 2021-08-14 10:48 UTC (permalink / raw)
To: fstests, Eryu Guan, Christoph Hellwig, David Sterba, linux-btrfs,
Josef Bacik
Cc: Christian Brauner, Christian Brauner, Christoph Hellwig, Chris Mason
From: Christian Brauner <christian.brauner@ubuntu.com>
While core vfs functionality that btrfs implements is completely covered
by the generic test-suite the btrfs specific ioctls are not.
This patch expands the test-suite to cover btrfs specific ioctls that
required changes to work on idmapped mounts. We deliberately don't use
the libbtrfsutil library as we need to know exactly what ioctl's are
issued and we need to be in control of all privileges at all times. This
test-suite currently tests:
- BTRFS_IOC_{SNAP,SUBVOL}_CREATE_V2
- subvolume creation on idmapped mounts where the fsids do have a
mapping in the superblock
- snapshot creation on idmapped mounts where the fsids do have a
mapping in the superblock
- subvolume creation on idmapped mounts where the fsids do not have a
mapping in the superblock
- snapshot creation on idmapped mounts where the fsids do not have
a mapping in the superblock
- subvolume creation on idmapped mounts where the caller is
located in a user namespace and the fsids do have a mapping
in the superblock
- snapshot creation on idmapped mounts where the caller is located
in a user namespace and the fsids do have a mapping in the
superblock
- subvolume creation on idmapped mounts where the caller is
located in a user namespace and the fsids do not have a mapping
in the superblock
- snapshot creation on idmapped mounts where the caller is located
in a user namespace and the fsids do not have a mapping in the
superblock
- BTRFS_IOC_SNAP_DESTROY_V2
- subvolume deletion on idmapped mounts where the fsids do have a
mapping in the superblock
- snapshot deletion on idmapped mounts where the fsids do have a
mapping in the superblock
- subvolume deletion on idmapped mounts where the fsids do not have a
mapping in the superblock
- snapshot deletion on idmapped mounts where the fsids do not have
a mapping in the superblock
- subvolume deletion on idmapped mounts where the caller is
located in a user namespace and the fsids do have a mapping
in the superblock
- snapshot deletion on idmapped mounts where the caller is located
in a user namespace and the fsids do have a mapping in the
superblock
- subvolume deletion on idmapped mounts where the caller is
located in a user namespace and the fsids do not have a mapping
in the superblock
- snapshot deletion on idmapped mounts where the caller is located
in a user namespace and the fsids do not have a mapping in the
superblock
- unprivileged subvolume deletion on idmapped mounts where the fsids
do have a mapping in the superblock and the filesystem is mounted
with "user_subvol_rm_allowed"
- unprivileged snapshot deletion on idmapped mounts where the fsids do
have a mapping in the superblock and the filesystem is mounted with
"user_subvol_rm_allowed"
- subvolume deletion on idmapped mounts where the caller is
located in a user namespace and the fsids do have a mapping
in the superblock and the filesystem is mounted with
"user_subvol_rm_allowed"
- snapshot deletion on idmapped mounts where the caller is located
in a user namespace and the fsids do have a mapping in the
superblock and the filesystem is mounted with
"user_subvol_rm_allowed"
- BTRFS_IOC_SUBVOL_SETFLAGS
- subvolume flags on idmapped mounts where the fsids do have a mapping
in the superblock
- snapshot flags on idmapped mounts where the fsids do have a mapping
in the superblock
- subvolume flags on idmapped mounts where the fsids do not have a
mapping in the superblock
- snapshot flags on idmapped mounts where the fsids do not have a
mapping in the superblock
- subvolume flags on idmapped mounts where the caller is located in a
user namespace and the fsids do have a mapping in the superblock
- snapshot flags on idmapped mounts where the caller is located in a
user namespace and the fsids do have a mapping in the superblock
- subvolume flags on idmapped mounts where the caller is located in a
user namespace and the fsids do not have a mapping in the superblock
- snapshot flags on idmapped mounts where the caller is located in a
user namespace and the fsids do not have a mapping in the superblock
- BTRFS_IOC_INO_LOOKUP_USER
- subvolume lookup on idmapped mounts where the fsids do have a mapping
in the superblock
- subvolume lookup on idmapped mounts where the fsids do not have a
mapping in the superblock
- subvolume lookup on idmapped mounts where the caller is located in a
user namespace and the fsids do have a mapping in the superblock
- subvolume lookup on idmapped mounts where the caller is located in a
user namespace and the fsids do not have a mapping in the superblock
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Chris Mason <clm@fb.com>
Cc: David Sterba <dsterba@suse.com>
Cc: fstests@vger.kernel.org
Cc: linux-btrfs@vger.kernel.org
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
/* v2 */
new patch
/* v3 */
- Christian Brauner <christian.brauner@ubuntu.com>:
- Ensure tests can be compiled on systems that lack the relevant
btrfs types and constants.
/* v4 */
unchanged
---
configure.ac | 10 +-
src/idmapped-mounts/idmapped-mounts.c | 3846 ++++++++++++++++++++++++-
tests/btrfs/244 | 34 +
tests/btrfs/244.out | 2 +
4 files changed, 3890 insertions(+), 2 deletions(-)
create mode 100755 tests/btrfs/244
create mode 100644 tests/btrfs/244.out
diff --git a/configure.ac b/configure.ac
index d6fc294d..4f9f672a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -67,9 +67,17 @@ AC_PACKAGE_WANT_LINUX_FS_H
AC_PACKAGE_WANT_LIBBTRFSUTIL
AC_HAVE_COPY_FILE_RANGE
-
AC_CHECK_FUNCS([renameat2])
AC_CHECK_TYPES([struct mount_attr], [], [], [[#include <linux/mount.h>]])
+AC_CHECK_TYPES([struct btrfs_qgroup_limit], [], [], [[#include <linux/btrfs.h>]])
+AC_CHECK_TYPES([struct btrfs_qgroup_inherit], [], [], [[#include <linux/btrfs.h>]])
+AC_CHECK_TYPES([struct btrfs_ioctl_vol_args], [], [], [[#include <linux/btrfs.h>]])
+AC_CHECK_TYPES([struct btrfs_ioctl_vol_args_v2], [], [], [[#include <linux/btrfs.h>]])
+AC_CHECK_TYPES([struct btrfs_ioctl_ino_lookup_args], [], [], [[#include <linux/btrfs.h>]])
+AC_CHECK_TYPES([struct btrfs_ioctl_ino_lookup_user_args], [], [], [[#include <linux/btrfs.h>]])
+AC_CHECK_TYPES([struct btrfs_ioctl_get_subvol_rootref_args], [], [], [[#include <linux/btrfs.h>]])
+AC_CHECK_HEADERS([linux/btrfs.h linux/btrfs_tree.h])
+
AC_CONFIG_HEADER(include/config.h)
AC_CONFIG_FILES([include/builddefs])
diff --git a/src/idmapped-mounts/idmapped-mounts.c b/src/idmapped-mounts/idmapped-mounts.c
index 1e7c25aa..78b7cc09 100644
--- a/src/idmapped-mounts/idmapped-mounts.c
+++ b/src/idmapped-mounts/idmapped-mounts.c
@@ -22,6 +22,14 @@
#include <sys/xattr.h>
#include <unistd.h>
+#ifdef HAVE_LINUX_BTRFS_H
+#include <linux/btrfs.h>
+#endif
+
+#ifdef HAVE_LINUX_BTRFS_TREE_H
+#include <linux/btrfs_tree.h>
+#endif
+
#ifdef HAVE_SYS_CAPABILITY_H
#include <sys/capability.h>
#endif
@@ -91,12 +99,21 @@ const char *t_fstype;
/* path of the test device */
const char *t_device;
+/* path of the test scratch device */
+const char *t_device_scratch;
+
/* mountpoint of the test device */
const char *t_mountpoint;
+/* mountpoint of the test device */
+const char *t_mountpoint_scratch;
+
/* fd for @t_mountpoint */
int t_mnt_fd;
+/* fd for @t_mountpoint_scratch */
+int t_mnt_scratch_fd;
+
/* fd for @T_DIR1 */
int t_dir1_fd;
@@ -9520,6 +9537,3786 @@ out:
return fret;
}
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_VOL_ARGS
+
+#ifndef BTRFS_PATH_NAME_MAX
+#define BTRFS_PATH_NAME_MAX 4087
+#endif
+
+struct btrfs_ioctl_vol_args {
+ __s64 fd;
+ char name[BTRFS_PATH_NAME_MAX + 1];
+};
+#endif
+
+#ifndef HAVE_STRUCT_BTRFS_QGROUP_LIMIT
+struct btrfs_qgroup_limit {
+ __u64 flags;
+ __u64 max_rfer;
+ __u64 max_excl;
+ __u64 rsv_rfer;
+ __u64 rsv_excl;
+};
+#endif
+
+#ifndef HAVE_STRUCT_BTRFS_QGROUP_INHERIT
+struct btrfs_qgroup_inherit {
+ __u64 flags;
+ __u64 num_qgroups;
+ __u64 num_ref_copies;
+ __u64 num_excl_copies;
+ struct btrfs_qgroup_limit lim;
+ __u64 qgroups[0];
+};
+#endif
+
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_VOL_ARGS_V2
+
+#ifndef BTRFS_SUBVOL_NAME_MAX
+#define BTRFS_SUBVOL_NAME_MAX 4039
+#endif
+
+struct btrfs_ioctl_vol_args_v2 {
+ __s64 fd;
+ __u64 transid;
+ __u64 flags;
+ union {
+ struct {
+ __u64 size;
+ struct btrfs_qgroup_inherit *qgroup_inherit;
+ };
+ __u64 unused[4];
+ };
+ union {
+ char name[BTRFS_SUBVOL_NAME_MAX + 1];
+ __u64 devid;
+ __u64 subvolid;
+ };
+};
+#endif
+
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_INO_LOOKUP_ARGS
+
+#ifndef BTRFS_INO_LOOKUP_PATH_MAX
+#define BTRFS_INO_LOOKUP_PATH_MAX 4080
+#endif
+struct btrfs_ioctl_ino_lookup_args {
+ __u64 treeid;
+ __u64 objectid;
+ char name[BTRFS_INO_LOOKUP_PATH_MAX];
+};
+#endif
+
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_INO_LOOKUP_USER_ARGS
+
+#ifndef BTRFS_VOL_NAME_MAX
+#define BTRFS_VOL_NAME_MAX 255
+#endif
+
+#ifndef BTRFS_INO_LOOKUP_USER_PATH_MAX
+#define BTRFS_INO_LOOKUP_USER_PATH_MAX (4080 - BTRFS_VOL_NAME_MAX - 1)
+#endif
+
+struct btrfs_ioctl_ino_lookup_user_args {
+ __u64 dirid;
+ __u64 treeid;
+ char name[BTRFS_VOL_NAME_MAX + 1];
+ char path[BTRFS_INO_LOOKUP_USER_PATH_MAX];
+};
+#endif
+
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_GET_SUBVOL_ROOTREF_ARGS
+
+#ifndef BTRFS_MAX_ROOTREF_BUFFER_NUM
+#define BTRFS_MAX_ROOTREF_BUFFER_NUM 255
+#endif
+
+struct btrfs_ioctl_get_subvol_rootref_args {
+ __u64 min_treeid;
+ struct {
+ __u64 treeid;
+ __u64 dirid;
+ } rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM];
+ __u8 num_items;
+ __u8 align[7];
+};
+#endif
+
+#ifndef BTRFS_IOCTL_MAGIC
+#define BTRFS_IOCTL_MAGIC 0x94
+#endif
+
+#ifndef BTRFS_IOC_SNAP_DESTROY
+#define BTRFS_IOC_SNAP_DESTROY \
+ _IOW(BTRFS_IOCTL_MAGIC, 15, struct btrfs_ioctl_vol_args)
+#endif
+
+#ifndef BTRFS_IOC_SNAP_DESTROY_V2
+#define BTRFS_IOC_SNAP_DESTROY_V2 \
+ _IOW(BTRFS_IOCTL_MAGIC, 63, struct btrfs_ioctl_vol_args_v2)
+#endif
+
+#ifndef BTRFS_IOC_SNAP_CREATE_V2
+#define BTRFS_IOC_SNAP_CREATE_V2 \
+ _IOW(BTRFS_IOCTL_MAGIC, 23, struct btrfs_ioctl_vol_args_v2)
+#endif
+
+#ifndef BTRFS_IOC_SUBVOL_CREATE_V2
+#define BTRFS_IOC_SUBVOL_CREATE_V2 \
+ _IOW(BTRFS_IOCTL_MAGIC, 24, struct btrfs_ioctl_vol_args_v2)
+#endif
+
+#ifndef BTRFS_IOC_SUBVOL_GETFLAGS
+#define BTRFS_IOC_SUBVOL_GETFLAGS _IOR(BTRFS_IOCTL_MAGIC, 25, __u64)
+#endif
+
+#ifndef BTRFS_IOC_SUBVOL_SETFLAGS
+#define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
+#endif
+
+#ifndef BTRFS_IOC_INO_LOOKUP
+#define BTRFS_IOC_INO_LOOKUP \
+ _IOWR(BTRFS_IOCTL_MAGIC, 18, struct btrfs_ioctl_ino_lookup_args)
+#endif
+
+#ifndef BTRFS_IOC_INO_LOOKUP_USER
+#define BTRFS_IOC_INO_LOOKUP_USER \
+ _IOWR(BTRFS_IOCTL_MAGIC, 62, struct btrfs_ioctl_ino_lookup_user_args)
+#endif
+
+#ifndef BTRFS_IOC_GET_SUBVOL_ROOTREF
+#define BTRFS_IOC_GET_SUBVOL_ROOTREF \
+ _IOWR(BTRFS_IOCTL_MAGIC, 61, struct btrfs_ioctl_get_subvol_rootref_args)
+#endif
+
+#ifndef BTRFS_SUBVOL_RDONLY
+#define BTRFS_SUBVOL_RDONLY (1ULL << 1)
+#endif
+
+#ifndef BTRFS_SUBVOL_SPEC_BY_ID
+#define BTRFS_SUBVOL_SPEC_BY_ID (1ULL << 4)
+#endif
+
+#ifndef BTRFS_FIRST_FREE_OBJECTID
+#define BTRFS_FIRST_FREE_OBJECTID 256ULL
+#endif
+
+static int btrfs_delete_subvolume(int parent_fd, const char *name)
+{
+ struct btrfs_ioctl_vol_args args = {};
+ size_t len;
+ int ret;
+
+ len = strlen(name);
+ if (len >= sizeof(args.name))
+ return -ENAMETOOLONG;
+
+ memcpy(args.name, name, len);
+ args.name[len] = '\0';
+
+ ret = ioctl(parent_fd, BTRFS_IOC_SNAP_DESTROY, &args);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_delete_subvolume_id(int parent_fd, uint64_t subvolid)
+{
+ struct btrfs_ioctl_vol_args_v2 args = {};
+ int ret;
+
+ args.flags = BTRFS_SUBVOL_SPEC_BY_ID;
+ args.subvolid = subvolid;
+
+ ret = ioctl(parent_fd, BTRFS_IOC_SNAP_DESTROY_V2, &args);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_create_subvolume(int parent_fd, const char *name)
+{
+ struct btrfs_ioctl_vol_args_v2 args = {};
+ size_t len;
+ int ret;
+
+ len = strlen(name);
+ if (len >= sizeof(args.name))
+ return -ENAMETOOLONG;
+
+ memcpy(args.name, name, len);
+ args.name[len] = '\0';
+
+ ret = ioctl(parent_fd, BTRFS_IOC_SUBVOL_CREATE_V2, &args);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_create_snapshot(int fd, int parent_fd, const char *name,
+ int flags)
+{
+ struct btrfs_ioctl_vol_args_v2 args = {
+ .fd = fd,
+ };
+ size_t len;
+ int ret;
+
+ if (flags & ~BTRFS_SUBVOL_RDONLY)
+ return -EINVAL;
+
+ len = strlen(name);
+ if (len >= sizeof(args.name))
+ return -ENAMETOOLONG;
+ memcpy(args.name, name, len);
+ args.name[len] = '\0';
+
+ if (flags & BTRFS_SUBVOL_RDONLY)
+ args.flags |= BTRFS_SUBVOL_RDONLY;
+ ret = ioctl(parent_fd, BTRFS_IOC_SNAP_CREATE_V2, &args);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_get_subvolume_ro(int fd, bool *read_only_ret)
+{
+ uint64_t flags;
+ int ret;
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+ if (ret < 0)
+ return -1;
+
+ *read_only_ret = flags & BTRFS_SUBVOL_RDONLY;
+ return 0;
+}
+
+static int btrfs_set_subvolume_ro(int fd, bool read_only)
+{
+ uint64_t flags;
+ int ret;
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+ if (ret < 0)
+ return -1;
+
+ if (read_only)
+ flags |= BTRFS_SUBVOL_RDONLY;
+ else
+ flags &= ~BTRFS_SUBVOL_RDONLY;
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &flags);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_get_subvolume_id(int fd, uint64_t *id_ret)
+{
+ struct btrfs_ioctl_ino_lookup_args args = {
+ .treeid = 0,
+ .objectid = BTRFS_FIRST_FREE_OBJECTID,
+ };
+ int ret;
+
+ ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
+ if (ret < 0)
+ return -1;
+
+ *id_ret = args.treeid;
+
+ return 0;
+}
+
+/*
+ * The following helpers are adapted from the btrfsutils library. We can't use
+ * the library directly since we need full control over how the subvolume
+ * iteration happens. We need to be able to check whether unprivileged
+ * subvolume iteration is possible, i.e. whether BTRFS_IOC_INO_LOOKUP_USER is
+ * available and also ensure that it is actually used when looking up paths.
+ */
+struct btrfs_stack {
+ uint64_t tree_id;
+ struct btrfs_ioctl_get_subvol_rootref_args rootref_args;
+ size_t items_pos;
+ size_t path_len;
+};
+
+struct btrfs_iter {
+ int fd;
+ int cur_fd;
+
+ struct btrfs_stack *search_stack;
+ size_t stack_len;
+ size_t stack_capacity;
+
+ char *cur_path;
+ size_t cur_path_capacity;
+};
+
+static struct btrfs_stack *top_stack_entry(struct btrfs_iter *iter)
+{
+ return &iter->search_stack[iter->stack_len - 1];
+}
+
+static int pop_stack(struct btrfs_iter *iter)
+{
+ struct btrfs_stack *top, *parent;
+ int fd, parent_fd;
+ size_t i;
+
+ if (iter->stack_len == 1) {
+ iter->stack_len--;
+ return 0;
+ }
+
+ top = top_stack_entry(iter);
+ iter->stack_len--;
+ parent = top_stack_entry(iter);
+
+ fd = iter->cur_fd;
+ for (i = parent->path_len; i < top->path_len; i++) {
+ if (i == 0 || iter->cur_path[i] == '/') {
+ parent_fd = openat(fd, "..", O_RDONLY);
+ if (fd != iter->cur_fd)
+ close(fd);
+ if (parent_fd == -1)
+ return -1;
+ fd = parent_fd;
+ }
+ }
+ if (iter->cur_fd != iter->fd)
+ close(iter->cur_fd);
+ iter->cur_fd = fd;
+
+ return 0;
+}
+
+static int append_stack(struct btrfs_iter *iter, uint64_t tree_id, size_t path_len)
+{
+ struct btrfs_stack *entry;
+
+ if (iter->stack_len >= iter->stack_capacity) {
+ size_t new_capacity = iter->stack_capacity * 2;
+ struct btrfs_stack *new_search_stack;
+
+ new_search_stack = reallocarray(iter->search_stack, new_capacity,
+ sizeof(*iter->search_stack));
+ if (!new_search_stack)
+ return -ENOMEM;
+
+ iter->stack_capacity = new_capacity;
+ iter->search_stack = new_search_stack;
+ }
+
+ entry = &iter->search_stack[iter->stack_len];
+
+ memset(entry, 0, sizeof(*entry));
+ entry->path_len = path_len;
+ entry->tree_id = tree_id;
+
+ if (iter->stack_len) {
+ struct btrfs_stack *top;
+ char *path;
+ int fd;
+
+ top = top_stack_entry(iter);
+ path = &iter->cur_path[top->path_len];
+ if (*path == '/')
+ path++;
+ fd = openat(iter->cur_fd, path, O_RDONLY);
+ if (fd == -1)
+ return -errno;
+
+ close(iter->cur_fd);
+ iter->cur_fd = fd;
+ }
+
+ iter->stack_len++;
+
+ return 0;
+}
+
+static int btrfs_iterator_start(int fd, uint64_t top, struct btrfs_iter **ret)
+{
+ struct btrfs_iter *iter;
+ int err;
+
+ iter = malloc(sizeof(*iter));
+ if (!iter)
+ return -ENOMEM;
+
+ iter->fd = fd;
+ iter->cur_fd = fd;
+
+ iter->stack_len = 0;
+ iter->stack_capacity = 4;
+ iter->search_stack = malloc(sizeof(*iter->search_stack) *
+ iter->stack_capacity);
+ if (!iter->search_stack) {
+ err = -ENOMEM;
+ goto out_iter;
+ }
+
+ iter->cur_path_capacity = 256;
+ iter->cur_path = malloc(iter->cur_path_capacity);
+ if (!iter->cur_path) {
+ err = -ENOMEM;
+ goto out_search_stack;
+ }
+
+ err = append_stack(iter, top, 0);
+ if (err)
+ goto out_cur_path;
+
+ *ret = iter;
+
+ return 0;
+
+out_cur_path:
+ free(iter->cur_path);
+out_search_stack:
+ free(iter->search_stack);
+out_iter:
+ free(iter);
+ return err;
+}
+
+static void btrfs_iterator_end(struct btrfs_iter *iter)
+{
+ if (iter) {
+ free(iter->cur_path);
+ free(iter->search_stack);
+ if (iter->cur_fd != iter->fd)
+ close(iter->cur_fd);
+ close(iter->fd);
+ free(iter);
+ }
+}
+
+static int __append_path(struct btrfs_iter *iter, const char *name,
+ size_t name_len, const char *dir, size_t dir_len,
+ size_t *path_len_ret)
+{
+ struct btrfs_stack *top = top_stack_entry(iter);
+ size_t path_len;
+ char *p;
+
+ path_len = top->path_len;
+ /*
+ * We need a joining slash if we have a current path and a subdirectory.
+ */
+ if (top->path_len && dir_len)
+ path_len++;
+ path_len += dir_len;
+ /*
+ * We need another joining slash if we have a current path and a name,
+ * but not if we have a subdirectory, because the lookup ioctl includes
+ * a trailing slash.
+ */
+ if (top->path_len && !dir_len && name_len)
+ path_len++;
+ path_len += name_len;
+
+ /* We need one extra character for the NUL terminator. */
+ if (path_len + 1 > iter->cur_path_capacity) {
+ char *tmp = realloc(iter->cur_path, path_len + 1);
+
+ if (!tmp)
+ return -ENOMEM;
+ iter->cur_path = tmp;
+ iter->cur_path_capacity = path_len + 1;
+ }
+
+ p = iter->cur_path + top->path_len;
+ if (top->path_len && dir_len)
+ *p++ = '/';
+ memcpy(p, dir, dir_len);
+ p += dir_len;
+ if (top->path_len && !dir_len && name_len)
+ *p++ = '/';
+ memcpy(p, name, name_len);
+ p += name_len;
+ *p = '\0';
+
+ *path_len_ret = path_len;
+
+ return 0;
+}
+
+static int get_subvolume_path(struct btrfs_iter *iter, uint64_t treeid,
+ uint64_t dirid, size_t *path_len_ret)
+{
+ struct btrfs_ioctl_ino_lookup_user_args args = {
+ .treeid = treeid,
+ .dirid = dirid,
+ };
+ int ret;
+
+ ret = ioctl(iter->cur_fd, BTRFS_IOC_INO_LOOKUP_USER, &args);
+ if (ret == -1)
+ return -1;
+
+ return __append_path(iter, args.name, strlen(args.name), args.path,
+ strlen(args.path), path_len_ret);
+}
+
+static int btrfs_iterator_next(struct btrfs_iter *iter, char **path_ret,
+ uint64_t *id_ret)
+{
+ struct btrfs_stack *top;
+ uint64_t treeid, dirid;
+ size_t path_len;
+ int ret, err;
+
+ for (;;) {
+ for (;;) {
+ if (iter->stack_len == 0)
+ return 1;
+
+ top = top_stack_entry(iter);
+ if (top->items_pos < top->rootref_args.num_items) {
+ break;
+ } else {
+ ret = ioctl(iter->cur_fd,
+ BTRFS_IOC_GET_SUBVOL_ROOTREF,
+ &top->rootref_args);
+ if (ret == -1 && errno != EOVERFLOW)
+ return -1;
+ top->items_pos = 0;
+
+ if (top->rootref_args.num_items == 0) {
+ err = pop_stack(iter);
+ if (err)
+ return err;
+ }
+ }
+ }
+
+ treeid = top->rootref_args.rootref[top->items_pos].treeid;
+ dirid = top->rootref_args.rootref[top->items_pos].dirid;
+ top->items_pos++;
+ err = get_subvolume_path(iter, treeid, dirid, &path_len);
+ if (err) {
+ /* Skip the subvolume if we can't access it. */
+ if (errno == EACCES)
+ continue;
+ return err;
+ }
+
+ err = append_stack(iter, treeid, path_len);
+ if (err) {
+ /*
+ * Skip the subvolume if it does not exist (which can
+ * happen if there is another filesystem mounted over a
+ * parent directory) or we don't have permission to
+ * access it.
+ */
+ if (errno == ENOENT || errno == EACCES)
+ continue;
+ return err;
+ }
+
+ top = top_stack_entry(iter);
+ goto out;
+ }
+
+out:
+ if (path_ret) {
+ *path_ret = malloc(top->path_len + 1);
+ if (!*path_ret)
+ return -ENOMEM;
+ memcpy(*path_ret, iter->cur_path, top->path_len);
+ (*path_ret)[top->path_len] = '\0';
+ }
+ if (id_ret)
+ *id_ret = top->tree_id;
+ return 0;
+}
+
+#define BTRFS_SUBVOLUME1 "subvol1"
+#define BTRFS_SUBVOLUME1_SNAPSHOT1 "subvol1_snapshot1"
+#define BTRFS_SUBVOLUME1_SNAPSHOT1_RO "subvol1_snapshot1_ro"
+#define BTRFS_SUBVOLUME1_RENAME "subvol1_rename"
+#define BTRFS_SUBVOLUME2 "subvol2"
+
+static int btrfs_subvolumes_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_up())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ if (!caps_down())
+ die("failure: lower caps");
+
+ /*
+ * The filesystem is not mounted with user_subvol_rm_allowed so
+ * subvolume deletion must fail.
+ */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: check ownership");
+
+ /* remove subvolume */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ if (!switch_fsids(0, 0)) {
+ log_stderr("failure: switch_fsids");
+ goto out;
+ }
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+ if (errno != EOVERFLOW) {
+ log_stderr("failure: errno");
+ goto out;
+ }
+
+ /* try to rename a subvolume */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0)) {
+ log_stderr("failure: renameat2");
+ goto out;
+ }
+ if (errno != EOVERFLOW) {
+ log_stderr("failure: errno");
+ goto out;
+ }
+
+ /* The caller is privileged over the inode so file deletion must work. */
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF, userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2))
+ die("failure: btrfs_create_subvolume");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* try to rename a subvolume */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0))
+ die("failure: renameat2");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /*
+ * The caller is not privileged over the inode so subvolume
+ * deletion must fail.
+ */
+
+ /* remove subvolume */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_up())
+ die("failure: raise caps");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ /* create directory */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr,
+ sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_fsids(0, 0)) {
+ log_stderr("failure: switch_fsids");
+ goto out;
+ }
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped
+ * mount so any file creation must fail.
+ */
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor
+ * which we can't use with ioctl(). So let's reopen it as a
+ * proper file descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".",
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0)
+ die("failure: openat");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create directory */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2))
+ die("failure: btrfs_create_subvolume");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* create read-write snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* create read-only snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* try to rename a directory */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0))
+ die("failure: renameat2");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ if (!caps_down())
+ die("failure: caps_down");
+
+ /* create read-write snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /* create read-only snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /*
+ * The caller is not privileged over the inode so subvolume
+ * deletion must fail.
+ */
+
+ /* remove directory */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ if (!caps_up())
+ die("failure: caps_down");
+
+ /*
+ * The caller is privileged over the inode so subvolume
+ * deletion must work.
+ */
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF,
+ userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr,
+ sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor
+ * which we can't use with ioctl(). So let's reopen it as a
+ * proper file descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".",
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped
+ * mount so any file creation must fail.
+ */
+
+ /* create directory */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2))
+ die("failure: btrfs_create_subvolume");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* create read-write snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /* create read-only snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /* try to rename a directory */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0))
+ die("failure: renameat2");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /*
+ * The caller is not privileged over the inode so subvolume
+ * deletion must fail.
+ */
+
+ /* remove directory */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(subvolume_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_mapped_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succedd.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ /*
+ * The scratch device is mounted with user_subvol_rm_allowed so
+ * subvolume deletion must succeed.
+ */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_mapped_userns_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: check ownership");
+
+ /*
+ * The scratch device is mounted with user_subvol_rm_allowed so
+ * subvolume deletion must succeed.
+ */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-only snapshot */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ safe_close(subvolume_fd);
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped_userns_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1))
+ die("failure: btrfs_delete_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* remove read-only snapshot */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ safe_close(subvolume_fd);
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_delete_by_spec_id(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF;
+ uint64_t subvolume_id1 = -EINVAL, subvolume_id2 = -EINVAL;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, "A")) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, "B")) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_mnt_scratch_fd, "B", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(subvolume_fd, "C")) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ safe_close(subvolume_fd);
+
+ subvolume_fd = openat(t_mnt_scratch_fd, "A", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fd, &subvolume_id1)) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_mnt_scratch_fd, "B/C", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fd, &subvolume_id2)) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ if (sys_mount(t_device_scratch, t_mountpoint, "btrfs", 0, "subvol=B/C")) {
+ log_stderr("failure: mount");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(-EBADF, t_mountpoint,
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ /*
+ * The subvolume isn't exposed in the idmapped mount so
+ * delation via spec id must fail.
+ */
+ if (!btrfs_delete_subvolume_id(tree_fd, subvolume_id1))
+ die("failure: btrfs_delete_subvolume_id");
+ if (errno != EOPNOTSUPP)
+ die("failure: errno");
+
+ if (btrfs_delete_subvolume_id(t_mnt_scratch_fd, subvolume_id1))
+ die("failure: btrfs_delete_subvolume_id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ sys_umount2(t_mountpoint, MNT_DETACH);
+ btrfs_delete_subvolume_id(t_mnt_scratch_fd, subvolume_id2);
+ btrfs_delete_subvolume(t_mnt_scratch_fd, "B");
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (!switch_fsids(0, 0))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF, userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF, subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount
+ * so any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(snapshot_fd);
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF, subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(snapshot_fd);
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_dir1_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, t_dir1_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0)) {
+ log_stderr("failure: btrfs_create_snapshot");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF;
+ bool read_only = false;
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+ if (!switch_fsids(0, 0))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(snapshot_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(subvolume_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF,
+ userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_dir1_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, t_dir1_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0)) {
+ log_stderr("failure: btrfs_create_snapshot");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF;
+ bool read_only = false;
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(snapshot_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(subvolume_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+
+ return fret;
+}
+
+#define BTRFS_SUBVOLUME_SUBVOL1 "subvol1"
+#define BTRFS_SUBVOLUME_SUBVOL2 "subvol2"
+#define BTRFS_SUBVOLUME_SUBVOL3 "subvol3"
+#define BTRFS_SUBVOLUME_SUBVOL4 "subvol4"
+
+#define BTRFS_SUBVOLUME_SUBVOL1_ID 0
+#define BTRFS_SUBVOLUME_SUBVOL2_ID 1
+#define BTRFS_SUBVOLUME_SUBVOL3_ID 2
+#define BTRFS_SUBVOLUME_SUBVOL4_ID 3
+
+#define BTRFS_SUBVOLUME_DIR1 "dir1"
+#define BTRFS_SUBVOLUME_DIR2 "dir2"
+
+#define BTRFS_SUBVOLUME_MNT "mnt_subvolume1"
+
+#define BTRFS_SUBVOLUME_SUBVOL1xSUBVOL3 "subvol1/subvol3"
+#define BTRFS_SUBVOLUME_SUBVOL1xDIR1xDIR2 "subvol1/dir1/dir2"
+#define BTRFS_SUBVOLUME_SUBVOL1xDIR1xDIR2xSUBVOL4 "subvol1/dir1/dir2/subvol4"
+
+/*
+ * We create the following mount layout to test lookup:
+ *
+ * |-/mnt/test /dev/loop0 btrfs rw,relatime,space_cache,subvolid=5,subvol=/
+ * | |-/mnt/test/mnt1 /dev/loop1[/subvol1] btrfs rw,relatime,space_cache,user_subvol_rm_allowed,subvolid=268,subvol=/subvol1
+ * '-/mnt/scratch /dev/loop1 btrfs rw,relatime,space_cache,user_subvol_rm_allowed,subvolid=5,subvol=/
+ */
+static int btrfs_subvolume_lookup_user(void)
+{
+ int fret = -1;
+ int dir1_fd = -EBADF, dir2_fd = -EBADF, mnt_fd = -EBADF,
+ open_tree_fd = -EBADF, tree_fd = -EBADF, userns_fd = -EBADF;
+ int subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID + 1];
+ uint64_t subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID + 1];
+ uint64_t subvolid = -EINVAL;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+ struct btrfs_iter *iter;
+
+ if (!caps_supported())
+ return 0;
+
+ for (int i = 0; i < ARRAY_SIZE(subvolume_fds); i++)
+ subvolume_fds[i] = -EBADF;
+
+ for (int i = 0; i < ARRAY_SIZE(subvolume_ids); i++)
+ subvolume_ids[i] = -EINVAL;
+
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, BTRFS_SUBVOLUME_SUBVOL1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, BTRFS_SUBVOLUME_SUBVOL2)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL1,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID], BTRFS_SUBVOLUME_SUBVOL3)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (mkdirat(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID], BTRFS_SUBVOLUME_DIR1, 0777)) {
+ log_stderr("failure: mkdirat");
+ goto out;
+ }
+
+ dir1_fd = openat(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID], BTRFS_SUBVOLUME_DIR1,
+ O_CLOEXEC | O_DIRECTORY);
+ if (dir1_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (mkdirat(dir1_fd, BTRFS_SUBVOLUME_DIR2, 0777)) {
+ log_stderr("failure: mkdirat");
+ goto out;
+ }
+
+ dir2_fd = openat(dir1_fd, BTRFS_SUBVOLUME_DIR2, O_CLOEXEC | O_DIRECTORY);
+ if (dir2_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_create_subvolume(dir2_fd, BTRFS_SUBVOLUME_SUBVOL4)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (mkdirat(t_mnt_fd, BTRFS_SUBVOLUME_MNT, 0777)) {
+ log_stderr("failure: mkdirat");
+ goto out;
+ }
+
+ snprintf(t_buf, sizeof(t_buf), "%s/%s", t_mountpoint, BTRFS_SUBVOLUME_MNT);
+ if (sys_mount(t_device_scratch, t_buf, "btrfs", 0,
+ "subvol=" BTRFS_SUBVOLUME_SUBVOL1)) {
+ log_stderr("failure: mount");
+ goto out;
+ }
+
+ mnt_fd = openat(t_mnt_fd, BTRFS_SUBVOLUME_MNT, O_CLOEXEC | O_DIRECTORY);
+ if (mnt_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (chown_r(t_mnt_scratch_fd, ".", 1000, 1000)) {
+ log_stderr("failure: chown_r");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL2_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL2,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL2_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL1_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL2_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL2_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL1xSUBVOL3,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL1xDIR1xDIR2xSUBVOL4,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+
+ if (fchmod(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID], S_IRUSR | S_IWUSR | S_IXUSR), 0) {
+ log_stderr("failure: fchmod");
+ goto out;
+ }
+
+ if (fchmod(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID], S_IRUSR | S_IWUSR | S_IXUSR), 0) {
+ log_stderr("failure: fchmod");
+ goto out;
+ }
+
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(mnt_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume3_found = false, subvolume4_found = false;
+
+ if (!switch_fsids(11000, 11000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: lower caps");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ if (subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID] &&
+ subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ die("failure: subvolume id %llu->%s",
+ (long long unsigned)subvolid, subvol_path);
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID])
+ subvolume3_found = true;
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ subvolume4_found = true;
+
+ free(subvol_path);
+ }
+ btrfs_iterator_end(iter);
+
+ if (!subvolume3_found || !subvolume4_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume3_found = false, subvolume4_found = false;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ if (subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID] &&
+ subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ die("failure: subvolume id %llu->%s",
+ (long long unsigned)subvolid, subvol_path);
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID])
+ subvolume3_found = true;
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ subvolume4_found = true;
+
+ free(subvol_path);
+ }
+ btrfs_iterator_end(iter);
+
+ if (!subvolume3_found || !subvolume4_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume_found = false;
+
+ if (!switch_fsids(0, 0))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: lower caps");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ free(subvol_path);
+
+ subvolume_found = true;
+ break;
+ }
+ btrfs_iterator_end(iter);
+
+ if (subvolume_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume_found = false;
+
+ if (!switch_userns(userns_fd, 0, 0, true))
+ die("failure: switch_userns");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ free(subvol_path);
+
+ subvolume_found = true;
+ break;
+ }
+ btrfs_iterator_end(iter);
+
+ if (subvolume_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(dir1_fd);
+ safe_close(dir2_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+ for (int i = 0; i < ARRAY_SIZE(subvolume_fds); i++)
+ safe_close(subvolume_fds[i]);
+ snprintf(t_buf, sizeof(t_buf), "%s/%s", t_mountpoint, BTRFS_SUBVOLUME_MNT);
+ sys_umount2(t_buf, MNT_DETACH);
+ unlinkat(t_mnt_fd, BTRFS_SUBVOLUME_MNT, AT_REMOVEDIR);
+
+ return fret;
+}
+
static void usage(void)
{
fprintf(stderr, "Description:\n");
@@ -9531,9 +13328,12 @@ static void usage(void)
fprintf(stderr, "--help Print help\n");
fprintf(stderr, "--mountpoint Mountpoint of device\n");
fprintf(stderr, "--supported Test whether idmapped mounts are supported on this filesystem\n");
+ fprintf(stderr, "--scratch-mountpoint Mountpoint of scratch device used in the tests\n");
+ fprintf(stderr, "--scratch-device Scratch device used in the tests\n");
fprintf(stderr, "--test-core Run core idmapped mount testsuite\n");
fprintf(stderr, "--test-fscaps-regression Run fscap regression tests\n");
fprintf(stderr, "--test-nested-userns Run nested userns idmapped mount testsuite\n");
+ fprintf(stderr, "--test-btrfs Run btrfs specific idmapped mount testsuite\n");
_exit(EXIT_SUCCESS);
}
@@ -9542,11 +13342,14 @@ static const struct option longopts[] = {
{"device", required_argument, 0, 'd'},
{"fstype", required_argument, 0, 'f'},
{"mountpoint", required_argument, 0, 'm'},
+ {"scratch-mountpoint", required_argument, 0, 'a'},
+ {"scratch-device", required_argument, 0, 'e'},
{"supported", no_argument, 0, 's'},
{"help", no_argument, 0, 'h'},
{"test-core", no_argument, 0, 'c'},
{"test-fscaps-regression", no_argument, 0, 'g'},
{"test-nested-userns", no_argument, 0, 'n'},
+ {"test-btrfs", no_argument, 0, 'b'},
{NULL, 0, 0, 0},
};
@@ -9613,6 +13416,31 @@ struct t_idmapped_mounts t_nested_userns[] = {
{ nested_userns, "test that nested user namespaces behave correctly when attached to idmapped mounts", },
};
+struct t_idmapped_mounts t_btrfs[] = {
+ { btrfs_subvolumes_fsids_mapped, "test subvolumes with mapped fsids", },
+ { btrfs_subvolumes_fsids_mapped_userns, "test subvolumes with mapped fsids inside user namespace", },
+ { btrfs_subvolumes_fsids_mapped_user_subvol_rm_allowed, "test subvolume deletion with user_subvol_rm_allowed mount option", },
+ { btrfs_subvolumes_fsids_mapped_userns_user_subvol_rm_allowed, "test subvolume deletion with user_subvol_rm_allowed mount option inside user namespace", },
+ { btrfs_subvolumes_fsids_unmapped, "test subvolumes with unmapped fsids", },
+ { btrfs_subvolumes_fsids_unmapped_userns, "test subvolumes with unmapped fsids inside user namespace", },
+ { btrfs_snapshots_fsids_mapped, "test snapshots with mapped fsids", },
+ { btrfs_snapshots_fsids_mapped_userns, "test snapshots with mapped fsids inside user namespace", },
+ { btrfs_snapshots_fsids_mapped_user_subvol_rm_allowed, "test snapshots deletion with user_subvol_rm_allowed mount option", },
+ { btrfs_snapshots_fsids_mapped_userns_user_subvol_rm_allowed, "test snapshots deletion with user_subvol_rm_allowed mount option inside user namespace", },
+ { btrfs_snapshots_fsids_unmapped, "test snapshots with unmapped fsids", },
+ { btrfs_snapshots_fsids_unmapped_userns, "test snapshots with unmapped fsids inside user namespace", },
+ { btrfs_delete_by_spec_id, "test subvolume deletion by spec id", },
+ { btrfs_subvolumes_setflags_fsids_mapped, "test subvolume flags with mapped fsids", },
+ { btrfs_subvolumes_setflags_fsids_mapped_userns, "test subvolume flags with mapped fsids inside user namespace", },
+ { btrfs_subvolumes_setflags_fsids_unmapped, "test subvolume flags with unmapped fsids", },
+ { btrfs_subvolumes_setflags_fsids_unmapped_userns, "test subvolume flags with unmapped fsids inside user namespace", },
+ { btrfs_snapshots_setflags_fsids_mapped, "test snapshots flags with mapped fsids", },
+ { btrfs_snapshots_setflags_fsids_mapped_userns, "test snapshots flags with mapped fsids inside user namespace", },
+ { btrfs_snapshots_setflags_fsids_unmapped, "test snapshots flags with unmapped fsids", },
+ { btrfs_snapshots_setflags_fsids_unmapped_userns, "test snapshots flags with unmapped fsids inside user namespace", },
+ { btrfs_subvolume_lookup_user, "test unprivileged subvolume lookup", },
+};
+
static bool run_test(struct t_idmapped_mounts suite[], size_t suite_size)
{
int i;
@@ -9650,7 +13478,7 @@ int main(int argc, char *argv[])
{
int fret, ret;
int index = 0;
- bool supported = false, test_core = false,
+ bool supported = false, test_btrfs = false, test_core = false,
test_fscaps_regression = false, test_nested_userns = false;
while ((ret = getopt_long_only(argc, argv, "", longopts, &index)) != -1) {
@@ -9676,6 +13504,15 @@ int main(int argc, char *argv[])
case 'n':
test_nested_userns = true;
break;
+ case 'b':
+ test_btrfs = true;
+ break;
+ case 'a':
+ t_mountpoint_scratch = optarg;
+ break;
+ case 'e':
+ t_device_scratch = optarg;
+ break;
case 'h':
/* fallthrough */
default:
@@ -9704,6 +13541,10 @@ int main(int argc, char *argv[])
if (t_mnt_fd < 0)
die("failed to open %s", t_mountpoint);
+ t_mnt_scratch_fd = openat(-EBADF, t_mountpoint_scratch, O_CLOEXEC | O_DIRECTORY);
+ if (t_mnt_fd < 0)
+ die("failed to open %s", t_mountpoint_scratch);
+
/*
* Caller just wants to know whether the filesystem we're on supports
* idmapped mounts.
@@ -9757,6 +13598,9 @@ int main(int argc, char *argv[])
!run_test(t_nested_userns, ARRAY_SIZE(t_nested_userns)))
goto out;
+ if (test_btrfs && !run_test(t_btrfs, ARRAY_SIZE(t_btrfs)))
+ goto out;
+
fret = EXIT_SUCCESS;
out:
diff --git a/tests/btrfs/244 b/tests/btrfs/244
new file mode 100755
index 00000000..9207788f
--- /dev/null
+++ b/tests/btrfs/244
@@ -0,0 +1,34 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2021 Christian Brauner. All Rights Reserved.
+#
+# FS QA Test 244
+#
+# Test that idmapped mounts behave correctly with btrfs specific features such
+# as subvolume and snapshot creation and deletion.
+#
+. ./common/preamble
+_begin_fstest auto quick idmapped subvolume
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+
+_supported_fs btrfs
+_require_idmapped_mounts
+_require_test
+_require_scratch
+
+_scratch_mkfs >> $seqres.full
+_scratch_mount "-o user_subvol_rm_allowed" >> $seqres.full
+
+echo "Silence is golden"
+
+$here/src/idmapped-mounts/idmapped-mounts --test-btrfs --device "$TEST_DEV" \
+ --mountpoint "$TEST_DIR" --scratch-device "$SCRATCH_DEV" \
+ --scratch-mountpoint "$SCRATCH_MNT" --fstype "$FSTYP"
+
+status=$?
+exit
diff --git a/tests/btrfs/244.out b/tests/btrfs/244.out
new file mode 100644
index 00000000..440da1f2
--- /dev/null
+++ b/tests/btrfs/244.out
@@ -0,0 +1,2 @@
+QA output created by 244
+Silence is golden
--
2.30.2
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