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| author | Steffen Klassert <steffen.klassert@secunet.com> | 2018-02-01 08:49:23 +0100 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2018-02-02 09:23:23 +0100 |
| commit | 19d7df69fdb2636856dc8919de72fc1bf8f79598 (patch) | |
| tree | ee6305700ada26831ec92f469be4fdb7d4199f4e | |
| parent | 743ffffefac1c670c6618742c923f6275d819604 (diff) | |
| download | linux-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>
| -rw-r--r-- | net/xfrm/xfrm_state.c | 5 |
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); |