[PATCH v1 0/2] Fix warning in collect_domain_accesses()

[Mickaël Salaün]

Hi,

As found by syzbot, there is an issue in the collect_domain_accesses()
function.  A WARN_ON_ONCE() can be triggered by processes sandboxed with
Landlock and trying to do a link with a mount root directory.  This is
then not a security issue.  Moreover, such directory can only be created
with the open_tree(2) syscall by a process with CAP_SYS_ADMIN.

See https://lore.kernel.org/r/000000000000553d3f0618198200@xxxxxxxxxx

Regards,

Mickaël Salaün (2):
  landlock: Fix d_parent walk
  selftests/landlock: Add layout1.refer_mount_root

 security/landlock/fs.c                     | 13 ++++++-
 tools/testing/selftests/landlock/fs_test.c | 45 ++++++++++++++++++++++
 2 files changed, 56 insertions(+), 2 deletions(-)


base-commit: 5bf9e57e634bd72a97b4b12c87186fc052a6a116
-- 
2.45.0