netdev - [PATCH bpf v2 1/2] bpf: sockmap, af_unix stream sockets need to hold ref for pair sock

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Date: Wed, 22 Nov 2023 11:24:51 -0800
From: John Fastabend <john.fastabend@...il.com>
To: martin.lau@...nel.org,
	jakub@...udflare.com
Cc: john.fastabend@...il.com,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH bpf v2 1/2] bpf: sockmap, af_unix stream sockets need to hold ref for pair sock

AF_UNIX stream sockets are a paired socket. So sending on one of the pairs
will lookup the paired socket as part of the send operation. It is possible
however to put just one of the pairs in a BPF map. This currently
increments the refcnt on the sock in the sockmap to ensure it is not
free'd by the stack before sockmap cleans up its state and stops any
skbs being sent/recv'd to that socket.

But we missed a case. If the peer socket is closed it will be
free'd by the stack. However, the paired socket can still be
referenced from BPF sockmap side because we hold a reference
there. Then if we are sending traffic through BPF sockmap to
that socket it will try to dereference the free'd pair in its
send logic creating a use after free.  And following splat,

   [59.900375] BUG: KASAN: slab-use-after-free in sk_wake_async+0x31/0x1b0
   [59.901211] Read of size 8 at addr ffff88811acbf060 by task kworker/1:2/954
   [...]
   [59.905468] Call Trace:
   [59.905787]  <TASK>
   [59.906066]  dump_stack_lvl+0x130/0x1d0
   [59.908877]  print_report+0x16f/0x740
   [59.910629]  kasan_report+0x118/0x160
   [59.912576]  sk_wake_async+0x31/0x1b0
   [59.913554]  sock_def_readable+0x156/0x2a0
   [59.914060]  unix_stream_sendmsg+0x3f9/0x12a0
   [59.916398]  sock_sendmsg+0x20e/0x250
   [59.916854]  skb_send_sock+0x236/0xac0
   [59.920527]  sk_psock_backlog+0x287/0xaa0

To fix let BPF sockmap hold a refcnt on both the socket in the
sockmap and its paired socket.  It wasn't obvious how to contain
the fix to bpf_unix logic. The primarily problem with keeping this
logic in bpf_unix was: In the sock close() we could handle the
deref by having a close handler. But, when we are destroying the
psock through a map delete operation we wouldn't have gotten any
signal thorugh the proto struct other than it being replaced.
If we do the deref from the proto replace its too early because
we need to deref the skpair after the backlog worker has been
stopped.

Given all this it seems best to just cache it at the end of the
psock and eat 8B for the af_unix and vsock users.

Notice dgram sockets are OK because they handle locking already.

Fixes: 94531cfcbe79 ("af_unix: Add unix_stream_proto for sockmap")
Signed-off-by: John Fastabend <john.fastabend@...il.com>
---
 include/linux/skmsg.h | 1 +
 include/net/af_unix.h | 1 +
 net/core/skmsg.c      | 2 ++
 net/unix/af_unix.c    | 2 --
 net/unix/unix_bpf.c   | 5 +++++
 5 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/skmsg.h b/include/linux/skmsg.h
index c1637515a8a4..fbe628961cf8 100644
--- a/include/linux/skmsg.h
+++ b/include/linux/skmsg.h
@@ -106,6 +106,7 @@ struct sk_psock {
 	struct mutex			work_mutex;
 	struct sk_psock_work_state	work_state;
 	struct delayed_work		work;
+	struct sock			*skpair;
 	struct rcu_work			rwork;
 };

diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 824c258143a3..49c4640027d8 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -75,6 +75,7 @@ struct unix_sock {
 };

 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
+#define unix_peer(sk) (unix_sk(sk)->peer)

 #define peer_wait peer_wq.wait

diff --git a/net/core/skmsg.c b/net/core/skmsg.c
index 6c31eefbd777..6236164b9bce 100644
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -826,6 +826,8 @@ static void sk_psock_destroy(struct work_struct *work)

 	if (psock->sk_redir)
 		sock_put(psock->sk_redir);
+	if (psock->skpair)
+		sock_put(psock->skpair);
 	sock_put(psock->sk);
 	kfree(psock);
 }
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 3e8a04a13668..87dd723aacf9 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -212,8 +212,6 @@ static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)
 }
 #endif /* CONFIG_SECURITY_NETWORK */

-#define unix_peer(sk) (unix_sk(sk)->peer)
-
 static inline int unix_our_peer(struct sock *sk, struct sock *osk)
 {
 	return unix_peer(osk) == sk;
diff --git a/net/unix/unix_bpf.c b/net/unix/unix_bpf.c
index 2f9d8271c6ec..7e7791029198 100644
--- a/net/unix/unix_bpf.c
+++ b/net/unix/unix_bpf.c
@@ -159,12 +159,17 @@ int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool re

 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore)
 {
+	struct sock *skpair = unix_peer(sk);
+
 	if (restore) {
 		sk->sk_write_space = psock->saved_write_space;
 		sock_replace_proto(sk, psock->sk_proto);
 		return 0;
 	}

+	skpair = unix_peer(sk);
+	sock_hold(skpair);
+	psock->skpair = skpair;
 	unix_stream_bpf_check_needs_rebuild(psock->sk_proto);
 	sock_replace_proto(sk, &unix_stream_bpf_prot);
 	return 0;
-- 
2.33.0