From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8B79242D68; Tue, 29 Apr 2025 17:41:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745948489; cv=none; b=eOt93og8sGPonEC8043jP2y5OmMXGAXGoRt1dNCLphZpjxvlnRJDXeEBAZE3guqufJPEaGOK3it97pn4ZbQuvlc127OSiKbiftw3gAXyVZ5lvOV0gKzPSOuBek0Q2plyp6qvhmD/Zt4qMshaxXAMUHO3kok5fLIdmYA3YjI6YKc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745948489; c=relaxed/simple; bh=587lfatq6AV9ZIjII0yhWiL3V0FEfXJnpi8ac3RS6GQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cI2ml+7ppavBlsyZ+664Y8tdOOBMP5BtIUdNtb4UxAonbvUah5rLmLwVnwQwrGuK6LLnZWBocWkOMxq2rRUn/huJEwFJ9RpG4FNaCXau2kSuu2LkOML7oDGTPQHsp7u/hrk6NDMxX7hAQxKl2O1S6jbnNErSKr8LMSQrL2UkocE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ufoo3Jef; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ufoo3Jef" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 149C2C4CEE3; Tue, 29 Apr 2025 17:41:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745948489; bh=587lfatq6AV9ZIjII0yhWiL3V0FEfXJnpi8ac3RS6GQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ufoo3JefE7KzHfCFUSbHGoDP9hghW7CS8ZHGgvEP/8araD/zbhu9XGSCP35HE2RtZ tFDcF+4E1TKrFt6vV6CYvY8EwKMz44nvPp2drPBUyP9fRT0Fb1q3vDHTRoLV0BrFES AFmaBCepe0L6ig/dZVsdsL5F6k3SG4F/a7JaEJDw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+b4cd76826045a1eb93c1@syzkaller.appspotmail.com, Jakub Kicinski , Eric Dumazet , Sabrina Dubroca , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 004/373] net: tls: explicitly disallow disconnect Date: Tue, 29 Apr 2025 18:38:01 +0200 Message-ID: <20250429161123.311080184@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161123.119104857@linuxfoundation.org> References: <20250429161123.119104857@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jakub Kicinski [ Upstream commit 5071a1e606b30c0c11278d3c6620cd6a24724cf6 ] syzbot discovered that it can disconnect a TLS socket and then run into all sort of unexpected corner cases. I have a vague recollection of Eric pointing this out to us a long time ago. Supporting disconnect is really hard, for one thing if offload is enabled we'd need to wait for all packets to be _acked_. Disconnect is not commonly used, disallow it. The immediate problem syzbot run into is the warning in the strp, but that's just the easiest bug to trigger: WARNING: CPU: 0 PID: 5834 at net/tls/tls_strp.c:486 tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 RIP: 0010:tls_strp_msg_load+0x72e/0xa80 net/tls/tls_strp.c:486 Call Trace: tls_rx_rec_wait+0x280/0xa60 net/tls/tls_sw.c:1363 tls_sw_recvmsg+0x85c/0x1c30 net/tls/tls_sw.c:2043 inet6_recvmsg+0x2c9/0x730 net/ipv6/af_inet6.c:678 sock_recvmsg_nosec net/socket.c:1023 [inline] sock_recvmsg+0x109/0x280 net/socket.c:1045 __sys_recvfrom+0x202/0x380 net/socket.c:2237 Fixes: 3c4d7559159b ("tls: kernel TLS support") Reported-by: syzbot+b4cd76826045a1eb93c1@syzkaller.appspotmail.com Signed-off-by: Jakub Kicinski Reviewed-by: Eric Dumazet Reviewed-by: Sabrina Dubroca Link: https://patch.msgid.link/20250404180334.3224206-1-kuba@kernel.org Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/tls/tls_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c index 4a3bf8528da7c..ba170f1f38a4c 100644 --- a/net/tls/tls_main.c +++ b/net/tls/tls_main.c @@ -626,6 +626,11 @@ static int tls_setsockopt(struct sock *sk, int level, int optname, return do_tls_setsockopt(sk, optname, optval, optlen); } +static int tls_disconnect(struct sock *sk, int flags) +{ + return -EOPNOTSUPP; +} + struct tls_context *tls_ctx_create(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); @@ -720,6 +725,7 @@ static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG], prot[TLS_BASE][TLS_BASE] = *base; prot[TLS_BASE][TLS_BASE].setsockopt = tls_setsockopt; prot[TLS_BASE][TLS_BASE].getsockopt = tls_getsockopt; + prot[TLS_BASE][TLS_BASE].disconnect = tls_disconnect; prot[TLS_BASE][TLS_BASE].close = tls_sk_proto_close; prot[TLS_SW][TLS_BASE] = prot[TLS_BASE][TLS_BASE]; -- 2.39.5