landlock: Handle weird files

[ Upstream commit 49440290 ]

A corrupted filesystem (e.g. bcachefs) might return weird files.
Instead of throwing a warning and allowing access to such file, treat
them as regular files.

Cc: Dave Chinner <david@fromorbit.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Paul Moore <paul@paul-moore.com>
Reported-by:  <syzbot+34b68f850391452207df@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/r/000000000000a65b35061cffca61@google.com


Reported-by:  <syzbot+360866a59e3c80510a62@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/r/67379b3f.050a0220.85a0.0001.GAE@google.com


Reported-by: Ubisectech Sirius <bugreport@ubisectech.com>
Closes: https://lore.kernel.org/r/c426821d-8380-46c4-a494-7008bbd7dd13.bugreport@ubisectech.com


Fixes: cb2c7d1a ("landlock: Support filesystem access-control")
Reviewed-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20250110153918.241810-1-mic@digikod.net


Signed-off-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>