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authorHerbert Xu <herbert@gondor.apana.org.au>2008-04-22 00:46:42 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-22 00:46:42 -0700
commitc5d18e984a313adf5a1a4ae69e0b1d93cf410229 (patch)
tree2922514a388759b999757eec49b7a5bd9f290e3c /net
parent7c3f944e29c02d71e13442e977cf4cec19c39e98 (diff)
downloadlinux-c5d18e984a313adf5a1a4ae69e0b1d93cf410229.tar.gz
[IPSEC]: Fix catch-22 with algorithm IDs above 31
As it stands it's impossible to use any authentication algorithms with an ID above 31 portably. It just happens to work on x86 but fails miserably on ppc64. The reason is that we're using a bit mask to check the algorithm ID but the mask is only 32 bits wide. After looking at how this is used in the field, I have concluded that in the long term we should phase out state matching by IDs because this is made superfluous by the reqid feature. For current applications, the best solution IMHO is to allow all algorithms when the bit masks are all ~0. The following patch does exactly that. This bug was identified by IBM when testing on the ppc64 platform using the NULL authentication algorithm which has an ID of 251. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/key/af_key.c2
-rw-r--r--net/xfrm/xfrm_policy.c2
-rw-r--r--net/xfrm/xfrm_user.c2
3 files changed, 4 insertions, 2 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 1fb0fe42a72..81a8e5297ad 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1907,7 +1907,7 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
t->encap_family = xp->family;
/* No way to set this via kame pfkey */
- t->aalgos = t->ealgos = t->calgos = ~0;
+ t->allalgs = 1;
xp->xfrm_nr++;
return 0;
}
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index ab4d0e598a2..e0c0390613c 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1819,7 +1819,7 @@ xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
(x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
(x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
x->props.mode == tmpl->mode &&
- ((tmpl->aalgos & (1<<x->props.aalgo)) ||
+ (tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
!(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
!(x->props.mode != XFRM_MODE_TRANSPORT &&
xfrm_state_addr_cmp(tmpl, x, family));
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 1810f5645bb..22a30ae582a 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -981,6 +981,8 @@ static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
t->aalgos = ut->aalgos;
t->ealgos = ut->ealgos;
t->calgos = ut->calgos;
+ /* If all masks are ~0, then we allow all algorithms. */
+ t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
t->encap_family = ut->family;
}
}