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 9F6A21A3178; Thu, 17 Apr 2025 18:18:33 +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=1744913913; cv=none; b=QZLim9wHzvI4gsmVEGKQXiv1sHpoYn2a9CrTi55BxQeMWCX1QmNnWy/Upl9Dh0JigFY95mQEb10Pf1b5jETBCHRF13vFZUCx2fVNKzys/HVzt3L6bFrr756b0JtxlgkhfHU8+d5KKpy/8JIURxQWjEWhiWZGWpRKUHqmBlh4y+I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744913913; c=relaxed/simple; bh=NrkdY1Poy4gBUcX0N7Jo1yDJfQBNn+4g6kiWBcN4hvU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gziWXskDsKv8o5HN9uZdh48A9SYTwuscse7yAV8dmpEqyRMakrGgDgnni3VDCYYvcNEGwV4H7ed0s2mTVev3HV4YQofFUsZELjx9omh+4s5FxrNeMEZMR/Ge6u8pJQimbhE62rwmk3ofRUOBJkt8niitXp+NBHrBuzRWpCPvZYg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ynNdeRe8; 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="ynNdeRe8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 06187C4CEEC; Thu, 17 Apr 2025 18:18:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744913913; bh=NrkdY1Poy4gBUcX0N7Jo1yDJfQBNn+4g6kiWBcN4hvU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ynNdeRe89hPxNAryO1/dCrQ7EyrqUM6Szl1wMbuHOUlxslNPnkuwNaurCBC6ZQkbz qPwYEAq/43QMgGoDj5gC2AM2qelICO6XHP7aYqCktxFv8F1ts7jZxpL8USpc1Wq39/ jOcjC29fSLH9RDnuAHori4bvcIUNtFoI79IVdhqk= 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 6.13 016/414] net: tls: explicitly disallow disconnect Date: Thu, 17 Apr 2025 19:46:14 +0200 Message-ID: <20250417175112.056827063@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250417175111.386381660@linuxfoundation.org> References: <20250417175111.386381660@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.13-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 6b4b9f2749a6f..0acf313deb01f 100644 --- a/net/tls/tls_main.c +++ b/net/tls/tls_main.c @@ -809,6 +809,11 @@ 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); @@ -904,6 +909,7 @@ 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