Patch "xfrm: Refuse to insert 32 bit userspace socket policies on 64 bit systems" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

xfrm: Refuse to insert 32 bit userspace socket policies on 64 bit systems

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
xfrm-refuse-to-insert-32-bit-userspace-socket-policies-on-64-bit-systems.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Steffen Klassert <[email protected]>
Date: Thu, 1 Feb 2018 08:49:23 +0100
Subject: xfrm: Refuse to insert 32 bit userspace socket policies on 64 bit systems

From: Steffen Klassert <[email protected]>

commit 19d7df69fdb2636856dc8919de72fc1bf8f79598 upstream.

We don't have a compat layer for xfrm, so userspace and kernel structures have different sizes in this case. This results in a broken configuration, so refuse to configure socket policies when trying to insert from 32 bit userspace as we do it already with policies inserted via netlink.

---
 net/xfrm/xfrm_state.c |    5 +++++
 1 file changed, 5 insertions(+)

@@ -2056,6 +2056,11 @@ int xfrm_user_policy(struct sock *sk, in
 	struct xfrm_mgr *km;
 	struct xfrm_policy *pol = NULL;
 
+#ifdef CONFIG_COMPAT
+	if (in_compat_syscall())
+		return -EOPNOTSUPP;
+#endif
+
 	if (!optval && !optlen) {
 		xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
 		xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/xfrm_user-uncoditionally-validate-esn-replay-attribute-struct.patch queue-4.15/xfrm-refuse-to-insert-32-bit-userspace-socket-policies-on-64-bit-systems.patch queue-4.15/net-xfrm-use-preempt-safe-this_cpu_read-in-ipcomp_alloc_tfms.patch