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Fix the SELinux netlink_send hook to properly handle multiple netlink messages in a single sk_buff; each message is parsed and subject to SELinux access control. Prior to this patch, SELinux only inspected the first message in the sk_buff. CVE: CVE-2020-0255 Cc: stable@vger.kernel.org Reported-by: Dmitry Vyukov <dvyukov@google.com> Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com> Change-Id: I5ee398e6d32452d2dd5766caf82a45782527a702 Signed-off-by: Paul Moore <paul@paul-moore.com>