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xfrm: Refuse to insert 32 bit userspace socket policies on 64 bit systems
commit 19d7df69fd
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>
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1 changed files with 5 additions and 0 deletions
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@ -2050,6 +2050,11 @@ int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen
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struct xfrm_mgr *km;
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struct xfrm_policy *pol = NULL;
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#ifdef CONFIG_COMPAT
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if (in_compat_syscall())
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return -EOPNOTSUPP;
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#endif
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if (!optval && !optlen) {
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xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
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xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
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