From d410ef75886a4efb3c49b8bacd8e3c295235e744 Mon Sep 17 00:00:00 2001 From: Cong Wang Date: Fri, 22 Mar 2019 16:26:19 -0700 Subject: [PATCH] xfrm: clean up xfrm protocol checks [ Upstream commit dbb2483b2a46fbaf833cfb5deb5ed9cace9c7399 ] 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 Cc: Herbert Xu Signed-off-by: Cong Wang Acked-by: Herbert Xu Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin --- include/net/xfrm.h | 17 +++++++++++++++++ net/ipv6/xfrm6_tunnel.c | 2 +- net/key/af_key.c | 4 +++- net/xfrm/xfrm_state.c | 2 +- net/xfrm/xfrm_user.c | 14 +------------- 5 files changed, 23 insertions(+), 16 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 5e3daf53b3d1..3e966c632f3b 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -1430,6 +1430,23 @@ 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/ipv6/xfrm6_tunnel.c b/net/ipv6/xfrm6_tunnel.c index 12cb3aa990af..d9e5f6808811 100644 --- a/net/ipv6/xfrm6_tunnel.c +++ b/net/ipv6/xfrm6_tunnel.c @@ -345,7 +345,7 @@ static void __net_exit xfrm6_tunnel_net_exit(struct net *net) unsigned int i; xfrm_flush_gc(); - xfrm_state_flush(net, IPSEC_PROTO_ANY, false, true); + xfrm_state_flush(net, 0, false, true); for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++) WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byaddr[i])); diff --git a/net/key/af_key.c b/net/key/af_key.c index 7d4bed955060..0b79c9aa8eb1 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -1951,8 +1951,10 @@ 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 3f729cd512af..11e09eb138d6 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -2386,7 +2386,7 @@ void xfrm_state_fini(struct net *net) flush_work(&net->xfrm.state_hash_work); flush_work(&xfrm_state_gc_work); - xfrm_state_flush(net, IPSEC_PROTO_ANY, false, true); + xfrm_state_flush(net, 0, false, true); WARN_ON(!list_empty(&net->xfrm.state_all)); diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 060afc4ffd95..2122f89f6155 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1513,20 +1513,8 @@ 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; -- GitLab