Commit cf655d39 authored by Yuejie Shi's avatar Yuejie Shi Committed by Sasha Levin

af_key: Add lock to key dump

[ Upstream commit 89e357d8 ]

A dump may come in the middle of another dump, modifying its dump
structure members. This race condition will result in NULL pointer
dereference in kernel. So add a lock to prevent that race.

Fixes: 83321d6b ("[AF_KEY]: Dump SA/SP entries non-atomically")
Signed-off-by: default avatarYuejie Shi <syjcnss@gmail.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent ca38136b
......@@ -63,6 +63,7 @@ struct pfkey_sock {
} u;
struct sk_buff *skb;
} dump;
struct mutex dump_lock;
};
static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
......@@ -143,6 +144,7 @@ static int pfkey_create(struct net *net, struct socket *sock, int protocol,
{
struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
struct sock *sk;
struct pfkey_sock *pfk;
int err;
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
......@@ -157,6 +159,9 @@ static int pfkey_create(struct net *net, struct socket *sock, int protocol,
if (sk == NULL)
goto out;
pfk = pfkey_sk(sk);
mutex_init(&pfk->dump_lock);
sock->ops = &pfkey_ops;
sock_init_data(sock, sk);
......@@ -285,13 +290,23 @@ static int pfkey_do_dump(struct pfkey_sock *pfk)
struct sadb_msg *hdr;
int rc;
mutex_lock(&pfk->dump_lock);
if (!pfk->dump.dump) {
rc = 0;
goto out;
}
rc = pfk->dump.dump(pfk);
if (rc == -ENOBUFS)
return 0;
if (rc == -ENOBUFS) {
rc = 0;
goto out;
}
if (pfk->dump.skb) {
if (!pfkey_can_dump(&pfk->sk))
return 0;
if (!pfkey_can_dump(&pfk->sk)) {
rc = 0;
goto out;
}
hdr = (struct sadb_msg *) pfk->dump.skb->data;
hdr->sadb_msg_seq = 0;
......@@ -302,6 +317,9 @@ static int pfkey_do_dump(struct pfkey_sock *pfk)
}
pfkey_terminate_dump(pfk);
out:
mutex_unlock(&pfk->dump_lock);
return rc;
}
......@@ -1805,19 +1823,26 @@ static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_ms
struct xfrm_address_filter *filter = NULL;
struct pfkey_sock *pfk = pfkey_sk(sk);
if (pfk->dump.dump != NULL)
mutex_lock(&pfk->dump_lock);
if (pfk->dump.dump != NULL) {
mutex_unlock(&pfk->dump_lock);
return -EBUSY;
}
proto = pfkey_satype2proto(hdr->sadb_msg_satype);
if (proto == 0)
if (proto == 0) {
mutex_unlock(&pfk->dump_lock);
return -EINVAL;
}
if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
filter = kmalloc(sizeof(*filter), GFP_KERNEL);
if (filter == NULL)
if (filter == NULL) {
mutex_unlock(&pfk->dump_lock);
return -ENOMEM;
}
memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
sizeof(xfrm_address_t));
......@@ -1833,6 +1858,7 @@ static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_ms
pfk->dump.dump = pfkey_dump_sa;
pfk->dump.done = pfkey_dump_sa_done;
xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
mutex_unlock(&pfk->dump_lock);
return pfkey_do_dump(pfk);
}
......@@ -2692,14 +2718,18 @@ static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb
{
struct pfkey_sock *pfk = pfkey_sk(sk);
if (pfk->dump.dump != NULL)
mutex_lock(&pfk->dump_lock);
if (pfk->dump.dump != NULL) {
mutex_unlock(&pfk->dump_lock);
return -EBUSY;
}
pfk->dump.msg_version = hdr->sadb_msg_version;
pfk->dump.msg_portid = hdr->sadb_msg_pid;
pfk->dump.dump = pfkey_dump_sp;
pfk->dump.done = pfkey_dump_sp_done;
xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
mutex_unlock(&pfk->dump_lock);
return pfkey_do_dump(pfk);
}
......
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