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 4.9-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-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 19d7df69fdb2636856dc8919de72fc1bf8f79598 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
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 <steffen.klassert@xxxxxxxxxxx>
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.
Reported-and-tested-by: syzbot+e1a1577ca8bcb47b769a@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_state.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1883,6 +1883,11 @@ 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 steffen.klassert@xxxxxxxxxxx are
queue-4.9/xfrm_user-uncoditionally-validate-esn-replay-attribute-struct.patch
queue-4.9/xfrm-refuse-to-insert-32-bit-userspace-socket-policies-on-64-bit-systems.patch
queue-4.9/net-xfrm-use-preempt-safe-this_cpu_read-in-ipcomp_alloc_tfms.patch