On Wed, Jun 4, 2025 at 12:37 PM Song Liu <song@xxxxxxxxxx> wrote: > > 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 just realized this only fails on hostfs. AFAICT, hostfs is only used by um. Do we really need this to behave the same on um+hostfs? Thanks, Song > > 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
