linux-kernel - [PATCH] net: tls: fix possible race condition between do_tls_getsockopt_conf() and do_tls_setsockopt

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Date:   Fri, 24 Feb 2023 18:58:11 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     borisp@...dia.com, john.fastabend@...il.com, kuba@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        davejwatson@...com, aviadye@...lanox.com, ilyal@...lanox.com,
        sd@...asysnail.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] net: tls: fix possible race condition between do_tls_getsockopt_conf() and do_tls_setsockopt_conf()

ctx->crypto_send.info is not protected by lock_sock in
do_tls_getsockopt_conf(). A race condition between do_tls_getsockopt_conf()
and do_tls_setsockopt_conf() can cause a NULL point dereference or
use-after-free read when memcpy.

Fixes: 3c4d7559159b ("tls: kernel TLS support")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 net/tls/tls_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 3735cb00905d..4956f5149b8e 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -374,6 +374,7 @@ static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 	}
 
 	/* get user crypto info */
+	lock_sock(sk);
 	if (tx) {
 		crypto_info = &ctx->crypto_send.info;
 		cctx = &ctx->tx;
@@ -381,6 +382,7 @@ static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 		crypto_info = &ctx->crypto_recv.info;
 		cctx = &ctx->rx;
 	}
+	release_sock(sk);
 
 	if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
 		rc = -EBUSY;
-- 
2.34.1