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 917045FF16; Tue, 23 Jan 2024 01:51:05 +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=1705974665; cv=none; b=Hz1OCJyrtk6tCw8/Z1n9WaB2ABMtuaGCJT7puroRbYS8q+JQt+ZoRBFK5JZDwr0WVFfPIhNfy2tiijw6g6OoEw0IkRsmugfeIhnXxeUlrersBVsys0FYDfJJew9at8alVmlQGCxZIH7tRUaptlqwkgBfsZJ6eNY85/rpqrUARsQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705974665; c=relaxed/simple; bh=Cya7ry4BDZE3ghC3UL5rbgWdt9RBlXcVkAixhc3ZS9I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fHWUD1vfVGDQd+ufCol0CIOAgLz2yPMVEsKuTTmiAzjgiiE+53hbvjXw/dG2EvV4F+WK51OXG8n1K/iy+8XOK34ZiUUK3B4l1ls0J7qgVLLPPjYGjNeOity5N4QEXZ1Ywgf9CEeRvZxtmzpePUAz/boRqqgbO1GE0TvukhaB9aE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=boyV0A0i; 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="boyV0A0i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 54CF6C43394; Tue, 23 Jan 2024 01:51:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705974665; bh=Cya7ry4BDZE3ghC3UL5rbgWdt9RBlXcVkAixhc3ZS9I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=boyV0A0i/6ZHv0SNkhww+Fox8rk8tW9uf1BYvzh4w07MIfPqb/LOv/hB6Bk6EFbyV HZLQR9+esNYJIJgMguEmJkRcEmmXd9cJuTaqba1+9LtKzC1CJaWNzSyJYJTTI6IdAo xFMV0SsOXWI2p/qRBdgeR+t3xWd3NTyjSlXfpkLc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Li Nan , Tom Talpey , Namjae Jeon , Steve French , Sasha Levin Subject: [PATCH 5.15 240/374] ksmbd: validate the zero field of packet header Date: Mon, 22 Jan 2024 15:58:16 -0800 Message-ID: <20240122235753.084913459@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122235744.598274724@linuxfoundation.org> References: <20240122235744.598274724@linuxfoundation.org> User-Agent: quilt/0.67 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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Li Nan [ Upstream commit 516b3eb8c8065f7465f87608d37a7ed08298c7a5 ] The SMB2 Protocol requires that "The first byte of the Direct TCP transport packet header MUST be zero (0x00)"[1]. Commit 1c1bcf2d3ea0 ("ksmbd: validate smb request protocol id") removed the validation of this 1-byte zero. Add the validation back now. [1]: [MS-SMB2] - v20230227, page 30. https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-SMB2/%5bMS-SMB2%5d-230227.pdf Fixes: 1c1bcf2d3ea0 ("ksmbd: validate smb request protocol id") Signed-off-by: Li Nan Acked-by: Tom Talpey Acked-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/ksmbd/smb_common.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c index d160363c09eb..e90a1e8c1951 100644 --- a/fs/ksmbd/smb_common.c +++ b/fs/ksmbd/smb_common.c @@ -158,8 +158,12 @@ int ksmbd_verify_smb_message(struct ksmbd_work *work) */ bool ksmbd_smb_request(struct ksmbd_conn *conn) { - __le32 *proto = (__le32 *)smb2_get_msg(conn->request_buf); + __le32 *proto; + if (conn->request_buf[0] != 0) + return false; + + proto = (__le32 *)smb2_get_msg(conn->request_buf); if (*proto == SMB2_COMPRESSION_TRANSFORM_ID) { pr_err_ratelimited("smb2 compression not support yet"); return false; -- 2.43.0