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Change History

In the Linux kernel, the following vulnerability has been resolved:

landlock: Fix LOG_SUBDOMAINS_OFF inheritance across fork()

hook_cred_transfer() only copies the Landlock security blob when the
source credential has a domain.  This is inconsistent with
landlock_restrict_self() which can set LOG_SUBDOMAINS_OFF on a
credential without creating a domain (via the ruleset_fd=-1 path): the
field is committed but not preserved across fork() because the child's
prepare_creds() calls hook_cred_transfer() which skips the copy when
domain is NULL.

This breaks the documented use case where a process mutes subdomain logs
before forking sandboxed children: the children lose the muting and
their domains produce unexpected audit records.

Fix this by unconditionally copying the Landlock credential blob.

https://git.kernel.org/stable/c/1c513b8a00df13d231021e74ad92babb3fedf64a

https://git.kernel.org/stable/c/2fcde49092aac55d5beef43fdd3633217672f7d1

https://git.kernel.org/stable/c/874c8f83826c95c62c21d9edfe9ef43e5c346724