[RFC PATCH] security/apparmor: use kfree_sensitive() in unpack_secmark()

[Zilin Guan]

On Fri, Apr 18, 2025 at 04:52:50AM+0000, Zilin Guan wrote:
> To mitigate this, replace kfree() with kfree_sensitive() for freeing
> secmark structures and their labels, aligning with the approach used
> in free_ruleset().

To clarify, we propose using kfree_sensitive() for secmark structures and 
their labels because they are already freed with kfree_sensitive() in 
another error path, specifically in aa_free_profile() -> free_ruleset().

This change aligns both cleanup pathways, whether aborting early in 
unpack_secmark() or cleaning up later via aa_free_profile() -> 
free_ruleset(). It ensures that all secmark-related allocations are 
scrubbed before deallocation, mitigating any potential security risks.

Best Regards,
Zilin Guan