From: Steffen Klassert 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: http://git.maquefel.me/?a=commitdiff_plain;h=19d7df69fdb2636856dc8919de72fc1bf8f79598;p=linux.git xfrm: Refuse to insert 32 bit userspace socket policies on 64 bit systems 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 --- diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 54e21f19d722c..f9d2f2233f095 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -2056,6 +2056,11 @@ 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);