On Thu, 2026-08-27 at 17:43 +0000, Bradley Morgan wrote:
> dentry_path() returns ERR_PTR(-ENAMETOOLONG) when the path exceeds the
> buffer. validate_hash_algo() passes the result straight to
> integrity_audit_msg() without checking. ERR_PTR is not NULL, so
> integrity_audit_message() sees a valid pointer and calls strlen() on
> it, which faults:
>
> BUG: unable to handle page fault for address: ffffffffffffffdc
> RIP: 0010:strlen+0x30/0xa0
> Call Trace:
> audit_log_untrustedstring+0x19/0x30
> integrity_audit_message+0x366/0x4f0
> ima_inode_setxattr+0x512/0x5f0
>
> Check for IS_ERR() and use NULL instead, which makes the audit message
> skip the name= field instead of crashing.
>
> Fixes: 4f2946aa0c45 ("IMA: introduce a new policy option func=SETXATTR_CHECK")
> Cc: [email protected]
> Reported-by: [email protected]
> Link: https://lore.kernel.org/all/[email protected]/
> Signed-off-by: Bradley Morgan <[email protected]>
Thanks, Bradley. The patch is now queued in next-integrity.
Mimi
