From: Steffen Klassert <steffen.klassert@secunet.com>
Date: Thu, 1 Feb 2018 07:49:23 +0000 (+0100)
Subject: xfrm: Refuse to insert 32 bit userspace socket policies on 64 bit systems
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=dffe655ddb48ee1b2165ca9250a54376199e3764;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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

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@syzkaller.appspotmail.com
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index bab20c626943..8f13fb57eab5 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2050,6 +2050,11 @@ int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen
 	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);