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| author | Christian Brauner <brauner@kernel.org> | 2025-02-21 14:13:14 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-03-04 09:29:54 +0100 |
| commit | 0e6eef95dfc908f6156be01aefee23a553c02afd (patch) | |
| tree | 5b8039c0b1c56449eae06c1cc8ce6ed4b78074fb /tools | |
| parent | d346ae7a641a02d76a6d9ee9ce2b7602e9e3965f (diff) | |
selftests: sixth test for mounting detached mounts onto detached mounts
Add a test to verify that detached mounts behave correctly.
Link: https://lore.kernel.org/r/20250221-brauner-open_tree-v1-15-dbcfcb98c676@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/mount_setattr/mount_setattr_test.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c index 938c9e33ac000..d2bf8b77df3fb 100644 --- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c +++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c @@ -2017,4 +2017,48 @@ TEST_F(mount_setattr, mount_detached1_onto_detached2_then_close_detached1_then_m EXPECT_EQ(close(fd_tree2), 0); } +TEST_F(mount_setattr, two_detached_mounts_referring_to_same_anonymous_mount_namespace) +{ + int fd_tree1 = -EBADF, fd_tree2 = -EBADF; + + /* + * Copy the following mount tree: + * + * |-/mnt/A testing tmpfs + * `-/mnt/A/AA testing tmpfs + * `-/mnt/A/AA/B testing tmpfs + * `-/mnt/A/AA/B/BB testing tmpfs + */ + fd_tree1 = sys_open_tree(-EBADF, "/mnt/A", + AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW | + AT_RECURSIVE | OPEN_TREE_CLOEXEC | + OPEN_TREE_CLONE); + ASSERT_GE(fd_tree1, 0); + + /* + * Create an O_PATH file descriptors with a separate struct file + * that refers to the same detached mount tree as @fd_tree1 + */ + fd_tree2 = sys_open_tree(fd_tree1, "", + AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW | + AT_EMPTY_PATH | OPEN_TREE_CLOEXEC); + ASSERT_GE(fd_tree2, 0); + + /* + * Copy the following mount tree: + * + * |-/tmp/target1 testing tmpfs + * `-/tmp/target1/AA testing tmpfs + * `-/tmp/target1/AA/B testing tmpfs + * `-/tmp/target1/AA/B/BB testing tmpfs + */ + ASSERT_EQ(move_mount(fd_tree2, "", -EBADF, "/tmp/target1", MOVE_MOUNT_F_EMPTY_PATH), 0); + + /* + * This must fail as this would mean adding the same mount tree + * into the same mount tree. + */ + ASSERT_NE(move_mount(fd_tree1, "", -EBADF, "/tmp/target1", MOVE_MOUNT_F_EMPTY_PATH), 0); +} + TEST_HARNESS_MAIN |