Hi Linus, This PR adds support for Landlock to UML. In fact, this fixes the way hostfs manages inodes according to the underlying filesystem [1]. They are now properly handled as for other filesystems, which enables to support Landlock (and probably other features). This PR also extends Landlock's tests with 6 pseudo filesystems, including hostfs. This PR can lead to a trivial merge conflict with tip [2] where one of Thomas's commit adds ARCH_HAS_CPU_FINALIZE_INIT and one of mine removes ARCH_EPHEMERAL_INODES in arch/um/Kconfig. Please pull these changes for v6.5-rc1 . These commits merged cleanly with v6.4, and have been successfully tested in the latest linux-next releases for a few weeks. [1] https://lore.kernel.org/all/20230612191430.339153-1-mic@xxxxxxxxxxx/ [2] https://lore.kernel.org/all/b57481af-5824-72f7-d20f-cfd78fcde519@xxxxxxxxxxx/ Regards, Mickaël -- The following changes since commit 858fd168a95c5b9669aac8db6c14a9aeab446375: Linux 6.4-rc6 (2023-06-11 14:35:30 -0700) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux.git tags/landlock-6.5-rc1 for you to fetch changes up to 35ca4239929737bdc021ee923f97ebe7aff8fcc4: selftests/landlock: Add hostfs tests (2023-06-12 21:26:23 +0200) ---------------------------------------------------------------- Landlock updates for v6.5-rc1 ---------------------------------------------------------------- Mickaël Salaün (6): hostfs: Fix ephemeral inodes selftests/landlock: Don't create useless file layouts selftests/landlock: Add supports_filesystem() helper selftests/landlock: Make mounts configurable selftests/landlock: Add tests for pseudo filesystems selftests/landlock: Add hostfs tests arch/Kconfig | 7 - arch/um/Kconfig | 1 - fs/hostfs/hostfs.h | 1 + fs/hostfs/hostfs_kern.c | 213 ++++++++-------- fs/hostfs/hostfs_user.c | 1 + security/landlock/Kconfig | 2 +- tools/testing/selftests/landlock/config | 9 +- tools/testing/selftests/landlock/config.um | 1 + tools/testing/selftests/landlock/fs_test.c | 387 +++++++++++++++++++++++++++-- 9 files changed, 478 insertions(+), 144 deletions(-) create mode 100644 tools/testing/selftests/landlock/config.um
