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author | Cong Wang <xiyou.wangcong@gmail.com> | 2019-03-23 02:26:19 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-16 09:13:35 +0300 |
commit | e1b22f7a0b273e2b6ff50afe950f6161ca8e3e58 (patch) | |
tree | ef1240c7240c900e75a7f4d691f8930a16f8e070 | |
parent | 949f4ca254ddb4b080c228ca35c8967ff1dd07e0 (diff) | |
download | linux-e1b22f7a0b273e2b6ff50afe950f6161ca8e3e58.tar.xz |
xfrm: clean up xfrm protocol checks
commit dbb2483b2a46fbaf833cfb5deb5ed9cace9c7399 upstream.
In commit 6a53b7593233 ("xfrm: check id proto in validate_tmpl()")
I introduced a check for xfrm protocol, but according to Herbert
IPSEC_PROTO_ANY should only be used as a wildcard for lookup, so
it should be removed from validate_tmpl().
And, IPSEC_PROTO_ANY is expected to only match 3 IPSec-specific
protocols, this is why xfrm_state_flush() could still miss
IPPROTO_ROUTING, which leads that those entries are left in
net->xfrm.state_all before exit net. Fix this by replacing
IPSEC_PROTO_ANY with zero.
This patch also extracts the check from validate_tmpl() to
xfrm_id_proto_valid() and uses it in parse_ipsecrequest().
With this, no other protocols should be added into xfrm.
Fixes: 6a53b7593233 ("xfrm: check id proto in validate_tmpl()")
Reported-by: syzbot+0bf0519d6e0de15914fe@syzkaller.appspotmail.com
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Zubin Mithra <zsm@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | include/net/xfrm.h | 17 | ||||
-rw-r--r-- | net/key/af_key.c | 4 | ||||
-rw-r--r-- | net/xfrm/xfrm_state.c | 2 | ||||
-rw-r--r-- | net/xfrm/xfrm_user.c | 14 |
4 files changed, 22 insertions, 15 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 185fb037b332..631614856afc 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -1301,6 +1301,23 @@ static inline int xfrm_state_kern(const struct xfrm_state *x) return atomic_read(&x->tunnel_users); } +static inline bool xfrm_id_proto_valid(u8 proto) +{ + switch (proto) { + case IPPROTO_AH: + case IPPROTO_ESP: + case IPPROTO_COMP: +#if IS_ENABLED(CONFIG_IPV6) + case IPPROTO_ROUTING: + case IPPROTO_DSTOPTS: +#endif + return true; + default: + return false; + } +} + +/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ static inline int xfrm_id_proto_match(u8 proto, u8 userproto) { return (!userproto || proto == userproto || diff --git a/net/key/af_key.c b/net/key/af_key.c index 36db179d848e..d2ec620319d7 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -1969,8 +1969,10 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) if (rq->sadb_x_ipsecrequest_mode == 0) return -EINVAL; + if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) + return -EINVAL; - t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ + t->id.proto = rq->sadb_x_ipsecrequest_proto; if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) return -EINVAL; t->mode = mode; diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 13f261feb75c..787f2cac18c5 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -2133,7 +2133,7 @@ void xfrm_state_fini(struct net *net) unsigned int sz; flush_work(&net->xfrm.state_hash_work); - xfrm_state_flush(net, IPSEC_PROTO_ANY, false); + xfrm_state_flush(net, 0, false); flush_work(&net->xfrm.state_gc_work); WARN_ON(!list_empty(&net->xfrm.state_all)); diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 8cc2a9df84fd..4dbe6ebeabf8 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1448,20 +1448,8 @@ static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family) return -EINVAL; } - switch (ut[i].id.proto) { - case IPPROTO_AH: - case IPPROTO_ESP: - case IPPROTO_COMP: -#if IS_ENABLED(CONFIG_IPV6) - case IPPROTO_ROUTING: - case IPPROTO_DSTOPTS: -#endif - case IPSEC_PROTO_ANY: - break; - default: + if (!xfrm_id_proto_valid(ut[i].id.proto)) return -EINVAL; - } - } return 0; |