From cdb226f9d1a9206086d26b35f6c95d14941495b3 Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 7 Oct 2019 10:58:29 +0100 Subject: [PATCH] rxrpc: Fix call crypto state cleanup Fix the cleanup of the crypto state on a call after the call has been disconnected. As the call has been disconnected, its connection ref has been discarded and so we can't go through that to get to the security ops table. Fix this by caching the security ops pointer in the rxrpc_call struct and using that when freeing the call security state. Also use this in other places we're dealing with call-specific security. The symptoms look like: BUG: KASAN: use-after-free in rxrpc_release_call+0xb2d/0xb60 net/rxrpc/call_object.c:481 Read of size 8 at addr ffff888062ffeb50 by task syz-executor.5/4764 Fixes: 70a8ad8b698d ("rxrpc: Fix -Wframe-larger-than= warnings from on-stack crypto") Reported-by: syzbot+eed305768ece6682bb7f@syzkaller.appspotmail.com Signed-off-by: David Howells --- net/rxrpc/ar-internal.h | 1 + net/rxrpc/call_accept.c | 1 + net/rxrpc/call_object.c | 6 +++--- net/rxrpc/conn_client.c | 3 +++ net/rxrpc/recvmsg.c | 6 +++--- net/rxrpc/sendmsg.c | 2 +- 6 files changed, 12 insertions(+), 7 deletions(-) diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index 1091bf35a1992..ecc17dabec8fc 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -556,6 +556,7 @@ struct rxrpc_call { struct rxrpc_peer *peer; /* Peer record for remote address */ struct rxrpc_sock __rcu *socket; /* socket responsible */ struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ + const struct rxrpc_security *security; /* applied security module */ struct mutex user_mutex; /* User access mutex */ unsigned long ack_at; /* When deferred ACK needs to happen */ unsigned long ack_lost_at; /* When ACK is figured as lost */ diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c index 1f778102ed8d7..135bf5cd8dd51 100644 --- a/net/rxrpc/call_accept.c +++ b/net/rxrpc/call_accept.c @@ -307,6 +307,7 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx, rxrpc_see_call(call); call->conn = conn; + call->security = conn->security; call->peer = rxrpc_get_peer(conn->params.peer); call->cong_cwnd = call->peer->cong_cwnd; return call; diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c index 6dace078971a3..a31c18c09894d 100644 --- a/net/rxrpc/call_object.c +++ b/net/rxrpc/call_object.c @@ -493,10 +493,10 @@ void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); - if (conn) { + if (conn) rxrpc_disconnect_call(call); - conn->security->free_call_crypto(call); - } + if (call->security) + call->security->free_call_crypto(call); rxrpc_cleanup_ring(call); _leave(""); diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c index 700eb77173fcb..376370cd92852 100644 --- a/net/rxrpc/conn_client.c +++ b/net/rxrpc/conn_client.c @@ -353,6 +353,7 @@ static int rxrpc_get_client_conn(struct rxrpc_sock *rx, if (cp->exclusive) { call->conn = candidate; + call->security = candidate->security; call->security_ix = candidate->security_ix; call->service_id = candidate->service_id; _leave(" = 0 [exclusive %d]", candidate->debug_id); @@ -404,6 +405,7 @@ static int rxrpc_get_client_conn(struct rxrpc_sock *rx, candidate_published: set_bit(RXRPC_CONN_IN_CLIENT_CONNS, &candidate->flags); call->conn = candidate; + call->security = candidate->security; call->security_ix = candidate->security_ix; call->service_id = candidate->service_id; spin_unlock(&local->client_conns_lock); @@ -426,6 +428,7 @@ found_extant_conn: spin_lock(&conn->channel_lock); call->conn = conn; + call->security = conn->security; call->security_ix = conn->security_ix; call->service_id = conn->service_id; list_add_tail(&call->chan_wait_link, &conn->waiting_calls); diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c index 3b0becb120415..a4090797c9b25 100644 --- a/net/rxrpc/recvmsg.c +++ b/net/rxrpc/recvmsg.c @@ -251,8 +251,8 @@ static int rxrpc_verify_packet(struct rxrpc_call *call, struct sk_buff *skb, seq += subpacket; } - return call->conn->security->verify_packet(call, skb, offset, len, - seq, cksum); + return call->security->verify_packet(call, skb, offset, len, + seq, cksum); } /* @@ -291,7 +291,7 @@ static int rxrpc_locate_data(struct rxrpc_call *call, struct sk_buff *skb, *_offset = offset; *_len = len; - call->conn->security->locate_data(call, skb, _offset, _len); + call->security->locate_data(call, skb, _offset, _len); return 0; } diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c index 22f51a7e356ee..813fd68881429 100644 --- a/net/rxrpc/sendmsg.c +++ b/net/rxrpc/sendmsg.c @@ -419,7 +419,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx, call->tx_winsize) sp->hdr.flags |= RXRPC_MORE_PACKETS; - ret = conn->security->secure_packet( + ret = call->security->secure_packet( call, skb, skb->mark, skb->head); if (ret < 0) goto out; -- 2.39.5