From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794590799; b=CNK43rrC4oejiVFuHjP5kTbabUaSzE1b6O6Iu9FprnbYAcV/nk7RvqLjKyICaTJ5sgsP t93/fWBjNq9M25JyR6fjMCBki9PPs9qavYsnjoM9AeRL+r1KrLeGIQoFxFqq2TrbY3PHB Mv9tamNor/rjOcy5AKPfjNj7m7rlSz5DiCgY0545zwSyXUtYn/vrXeoZfJ42jBJfqld6a +Ch3dYU6xizP0knmzoXhiixV6+REOoJcNrE5Xn9pbqJNjaCffQCgyWhA0x6sgqcqL+rWW dbKEzyAb3duTEZuHLw9I6HmTQc/rgpue4i/7Un1KReN3V28vlWjF6FQXBG9cqYjR6ng== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794590799; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=/SZDbg+TW5DHbwtBxxljAewnWPrZHdJYhIr9sAaQvl8=; b=yzdguWrheqf1ikRXEWHr4se+F3d9l/d0+HRB7pvVFXuzg9MO8zhwUZGu+uyyVQzNNsS3 hwCqMZ6t/VKRNLKDMY5CRzBKxK6Vgc398gF/6SrX8Cqm7Lz773SGNQn/Kn1z0nWYUJg/9 ehYmSCI7RzYCgEodJdmrHxzOJSBFgX1kmqqcnaiQj+4mQiSzc0TvAzafkDzAXTxqTvkoi 8h+u9aeNSCBrtlkCyedfK181tobmh4GGeyLSLY53/HIWlGv+D37dA3p0QvTnfYtf67F7S a+qAFYGWi0O3RIvhC+DFERFsYBTtx7rfAVB9Aot1SupQlBcfF4LYUf9SLBDXE7eCvKw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=eteG6IQf; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D0A6607D2E3; Fri, 13 Nov 2026 17:26:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=eteG6IQf Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5EA211F000C4; Fri, 13 Nov 2026 17:26:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794590798; bh=/SZDbg+TW5DHbwtBxxljAewnWPrZHdJYhIr9sAaQvl8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=eteG6IQfGK1qiyjYsW+gIFHLi1h4JhIoXpPnswCoxT3U39e1l81AF4VcBiRxyhu8A xnJhzuEb9rgVVZ/rCw2IFCO7kOlNpNr0ovkOZmoZZGr9i4f5Kax+xQDA4V2bvuCIny OLeLEiRjBgBA4V+v7HkmqTdkLtwOuN9Fxv6f8Ios= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hannes Reinecke , Christoph Hellwig , Yingjie Wang <1075151112@qq.com>, Keith Busch , Sasha Levin Subject: [PATCH 6.18 651/686] nvme-tcp: validate the TLS handshake timeout Date: Fri, 13 Nov 2026 10:53:04 -0500 Message-ID: <20261113153843.824453015@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261113153820.902362109@linuxfoundation.org> References: <20261113153820.902362109@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yingjie Wang <1075151112@qq.com> [ Upstream commit 799203afd298b1f8e9ee49815eb38f775f211299 ] tls_handshake_timeout is writable but stored as a signed int. Multiplying the value by MSEC_PER_SEC and HZ therefore uses signed arithmetic. With HZ=1000, setting it to 2147484 overflows both multiplications. If the handshake request is accepted and its completion remains pending, schedule_timeout() reports a wrong timeout value with a stack dump and returns zero. The handshake then fails immediately with -ETIMEDOUT, while the handshake agent was given about 24.9 days. Negative values such as -1 have the same kernel-side effect. Store the parameter as an unsigned int and reject values that cannot be represented both by tls_handshake_args::ta_timeout_ms and by a safe jiffies delay. Take one snapshot so a concurrent parameter update cannot give the handshake agent and completion wait different timeouts. Document the accepted range for built-in use. wait_for_completion_interruptible_timeout() returns the remaining jiffies as a long after a successful completion. Keep that result in a long because an accepted timeout can exceed INT_MAX jiffies on 64-bit systems. Negative and oversized values now fail with -EINVAL. Keep zero valid, preserving the existing immediate-timeout behavior. Fixes: be8e82caa685 ("nvme-tcp: enable TLS handshake upcall") Cc: stable@vger.kernel.org Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Yingjie Wang <1075151112@qq.com> Signed-off-by: Keith Busch Signed-off-by: Sasha Levin --- .../admin-guide/kernel-parameters.txt | 5 +++ drivers/nvme/host/tcp.c | 34 ++++++++++++++----- 2 files changed, 31 insertions(+), 8 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 1b53bc0671249..e9ffe9c877b1a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4652,6 +4652,11 @@ Kernel parameters See Documentation/admin-guide/sysctl/vm.rst for details. + nvme_tcp.tls_handshake_timeout= + [NVME] NVMe/TCP host TLS handshake timeout in seconds. + Valid values range from 0 to the smaller of + UINT_MAX / 1000 and MAX_JIFFY_OFFSET / HZ. Default: 10 + nvmet_tcp.tls_handshake_timeout= [NVME] NVMe/TCP target TLS handshake timeout in seconds. Valid values range from 0 to the smaller of diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 190eac661e7da..fad2f2f969a08 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -6,6 +6,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include +#include #include #include #include @@ -46,9 +47,24 @@ MODULE_PARM_DESC(wq_unbound, "Use unbound workqueue for nvme-tcp IO context (def /* * TLS handshake timeout */ -static int tls_handshake_timeout = 10; +static unsigned int tls_handshake_timeout = 10; #ifdef CONFIG_NVME_TCP_TLS -module_param(tls_handshake_timeout, int, 0644); +static int tls_handshake_timeout_set(const char *val, + const struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, 0, + min_t(unsigned long, UINT_MAX / MSEC_PER_SEC, + MAX_JIFFY_OFFSET / HZ)); +} + +static const struct kernel_param_ops tls_handshake_timeout_ops = { + .set = tls_handshake_timeout_set, + .get = param_get_uint, +}; + +module_param_cb(tls_handshake_timeout, &tls_handshake_timeout_ops, + &tls_handshake_timeout, 0644); +__MODULE_PARM_TYPE(tls_handshake_timeout, "uint"); MODULE_PARM_DESC(tls_handshake_timeout, "nvme TLS handshake timeout in seconds (default 10)"); #endif @@ -1912,8 +1928,10 @@ static int nvme_tcp_start_tls(struct nvme_ctrl *nctrl, { int qid = nvme_tcp_queue_id(queue); int ret; + long wait_ret; struct tls_handshake_args args; - unsigned long tmo = tls_handshake_timeout * HZ; + unsigned int timeout = READ_ONCE(tls_handshake_timeout); + unsigned long tmo = (unsigned long)timeout * HZ; key_serial_t keyring = nvme_keyring_id(); dev_dbg(nctrl->device, "queue %d: start TLS with key %x\n", @@ -1927,7 +1945,7 @@ static int nvme_tcp_start_tls(struct nvme_ctrl *nctrl, if (nctrl->opts->keyring) keyring = key_serial(nctrl->opts->keyring); args.ta_keyring = keyring; - args.ta_timeout_ms = tls_handshake_timeout * 1000; + args.ta_timeout_ms = timeout * MSEC_PER_SEC; queue->tls_err = -EOPNOTSUPP; init_completion(&queue->tls_complete); ret = tls_client_hello_psk(&args, GFP_KERNEL); @@ -1936,10 +1954,10 @@ static int nvme_tcp_start_tls(struct nvme_ctrl *nctrl, qid, ret); return ret; } - ret = wait_for_completion_interruptible_timeout(&queue->tls_complete, tmo); - if (ret <= 0) { - if (ret == 0) - ret = -ETIMEDOUT; + wait_ret = wait_for_completion_interruptible_timeout(&queue->tls_complete, + tmo); + if (wait_ret <= 0) { + ret = wait_ret < 0 ? -ERESTARTSYS : -ETIMEDOUT; dev_err(nctrl->device, "queue %d: TLS handshake failed, error %d\n", -- 2.53.0