On Tue, Jun 3, 2025 at 6:46 AM Mickaël Salaün <mic@xxxxxxxxxxx> wrote: > > Landlock tests with hostfs fail: > > ok 126 layout3_fs.hostfs.tag_inode_file > # RUN layout3_fs.hostfs.release_inodes ... > # fs_test.c:5555:release_inodes:Expected EACCES (13) == test_open(TMP_DIR, O_RDONLY) (0) > > This specific test checks that an access to a (denied) mount point over > an allowed directory is indeed denied. I am having trouble understanding the test. It appears to me the newly mounted tmpfs on /tmp is allowed, but accesses to / and thus mount point /tmp is denied? What would the walk in is_access_to_paths_allowed look like? > It's not clear to me the origin of the issue, but it seems to be related > to choose_mountpoint(). > > You can run these tests with `check-linux.sh build kselftest` from > https://github.com/landlock-lsm/landlock-test-tools How should I debug this test? printk doesn't seem to work. Thanks, Song
