netdev - xfrm: Forbid state updates from changing encap type

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Message-ID: <20171226063444.GA26819@gondor.apana.org.au>
Date:   Tue, 26 Dec 2017 17:34:44 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        netdev@...r.kernel.org
Subject: xfrm: Forbid state updates from changing encap type

Currently we allow state updates to competely replace the contents
of x->encap.  This is bad because on the user side ESP only sets up
header lengths depending on encap_type once when the state is first
created.  This could result in the header lengths getting out of
sync with the actual state configuration.

In practice key managers will never do a state update to change the
encapsulation type.  Only the port numbers need to be changed as the
peer NAT entry is updated.

Therefore this patch adds a check in xfrm_state_update to forbid
any changes to the encap_type.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 065d896..dc1cdde 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1533,8 +1533,12 @@ int xfrm_state_update(struct xfrm_state *x)
 	err = -EINVAL;
 	spin_lock_bh(&x1->lock);
 	if (likely(x1->km.state == XFRM_STATE_VALID)) {
-		if (x->encap && x1->encap)
+		if (x->encap && x1->encap &&
+		    x->encap->encap_type == x1->encap->encap_type)
 			memcpy(x1->encap, x->encap, sizeof(*x1->encap));
+		else if (x->encap || x1->encap)
+			goto fail;
+
 		if (x->coaddr && x1->coaddr) {
 			memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
 		}
@@ -1551,6 +1555,8 @@ int xfrm_state_update(struct xfrm_state *x)
 		x->km.state = XFRM_STATE_DEAD;
 		__xfrm_state_put(x);
 	}
+
+fail:
 	spin_unlock_bh(&x1->lock);
 
 	xfrm_state_put(x1);
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt