linux-kernel - [PATCH v2] net/tcp: use kfree_sensitive() instend of kfree() in two functions

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Message-Id: <20231116022213.28795-1-duminjie@vivo.com>
Date:   Thu, 16 Nov 2023 10:22:12 +0800
From:   Minjie Du <duminjie@...o.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev@...r.kernel.org (open list:NETWORKING [TCP]),
        linux-kernel@...r.kernel.org (open list)
Cc:     opensource.kernel@...o.com, Minjie Du <duminjie@...o.com>
Subject: [PATCH v2] net/tcp: use kfree_sensitive() instend of kfree() in two functions

key might contain private information, so use kfree_sensitive to free it.
In tcp_time_wait_init() and tcp_md5_twsk_free_rcu() use kfree_sensitive().

Signed-off-by: Minjie Du <duminjie@...o.com>
---
 net/ipv4/tcp_minisocks.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index a9807eeb311c..83686c7e7ce9 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -281,7 +281,7 @@ static void tcp_time_wait_init(struct sock *sk, struct tcp_timewait_sock *tcptw)
 	return;
 out_free:
 	WARN_ON_ONCE(1);
-	kfree(tcptw->tw_md5_key);
+	kfree_sensitive(tcptw->tw_md5_key);
 	tcptw->tw_md5_key = NULL;
 #endif
 }
@@ -368,7 +368,7 @@ static void tcp_md5_twsk_free_rcu(struct rcu_head *head)
 	struct tcp_md5sig_key *key;
 
 	key = container_of(head, struct tcp_md5sig_key, rcu);
-	kfree(key);
+	kfree_sensitive(key);
 	static_branch_slow_dec_deferred(&tcp_md5_needed);
 	tcp_md5_release_sigpool();
 }
-- 
2.39.0