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authorSteffen Klassert <steffen.klassert@secunet.com>2018-02-01 08:49:23 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2018-02-02 09:23:23 +0100
commit19d7df69fdb2636856dc8919de72fc1bf8f79598 (patch)
treeee6305700ada26831ec92f469be4fdb7d4199f4e /net/xfrm/xfrm_state.c
parent743ffffefac1c670c6618742c923f6275d819604 (diff)
downloadlinux-19d7df69fdb2636856dc8919de72fc1bf8f79598.tar.bz2
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 <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_state.c')
-rw-r--r--net/xfrm/xfrm_state.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 54e21f19d722..f9d2f2233f09 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);