linux-kernel - [PATCH v1 0/2] Fix warning in collect_domain

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Date: Thu, 16 May 2024 20:19:33 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Günther Noack <gnoack@...gle.com>,
	Paul Moore <paul@...l-moore.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
	"Serge E . Hallyn" <serge@...lyn.com>,
	nathan@...nel.org,
	ndesaulniers@...gle.com,
	syzkaller-bugs@...glegroups.com,
	trix@...hat.com,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: [PATCH v1 0/2] Fix warning in collect_domain_accesses()

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@google.com

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