From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3CD0BC388F9 for ; Tue, 3 Nov 2020 20:42:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08B1D223AC for ; Tue, 3 Nov 2020 20:42:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604436159; bh=KTm/RfNC7dQVflQT7/1LPU8QMPTmOOjakj/OpihlEFo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ArPWTunBQtMB9zGXNU5MRro9o4LOJznSLytxAO1r3bvU2LqVFVWVFWHe3wGQOeur8 MK8V13ADwrZ2DNCIQBGoShO2yBKHo3vdPT6KimBOC9YbasAOP0VEwrMhBGTRVk2o8n 1HbZVbYh+nBE7UY4Wa/RuKG3vOLivf+O0iojU/rA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730550AbgKCUmh (ORCPT ); Tue, 3 Nov 2020 15:42:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:54950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730541AbgKCUmd (ORCPT ); Tue, 3 Nov 2020 15:42:33 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B6ECF223BF; Tue, 3 Nov 2020 20:42:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604436152; bh=KTm/RfNC7dQVflQT7/1LPU8QMPTmOOjakj/OpihlEFo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JcQkQZgnu2rXl2eMY3a9DPdYB57GePPq98oJrSW14MQRGAbKiXafvFkmgzrZ7nxDh OE1uuv5EekYx04OwYySE8fIiiZdSNmrQM+oFmXf4dx4ALEQT3MMtnsKJhAwStWuAL/ OqF/hVz5ASZP9V3ONXWHhoxZkzi3gnYgeLEF25rg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Gao Xiang , "Darrick J. Wong" , Brian Foster , Sasha Levin Subject: [PATCH 5.9 125/391] xfs: avoid LR buffer overrun due to crafted h_len Date: Tue, 3 Nov 2020 21:32:56 +0100 Message-Id: <20201103203355.260789803@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201103203348.153465465@linuxfoundation.org> References: <20201103203348.153465465@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gao Xiang [ Upstream commit f692d09e9c8fd0f5557c2e87f796a16dd95222b8 ] Currently, crafted h_len has been blocked for the log header of the tail block in commit a70f9fe52daa ("xfs: detect and handle invalid iclog size set by mkfs"). However, each log record could still have crafted h_len and cause log record buffer overrun. So let's check h_len vs buffer size for each log record as well. Signed-off-by: Gao Xiang Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster Signed-off-by: Sasha Levin --- fs/xfs/xfs_log_recover.c | 39 +++++++++++++++++++-------------------- 1 file changed, 19 insertions(+), 20 deletions(-) diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index e2ec91b2d0f46..9ceb67d0f2565 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -2904,7 +2904,8 @@ STATIC int xlog_valid_rec_header( struct xlog *log, struct xlog_rec_header *rhead, - xfs_daddr_t blkno) + xfs_daddr_t blkno, + int bufsize) { int hlen; @@ -2920,10 +2921,14 @@ xlog_valid_rec_header( return -EFSCORRUPTED; } - /* LR body must have data or it wouldn't have been written */ + /* + * LR body must have data (or it wouldn't have been written) + * and h_len must not be greater than LR buffer size. + */ hlen = be32_to_cpu(rhead->h_len); - if (XFS_IS_CORRUPT(log->l_mp, hlen <= 0 || hlen > INT_MAX)) + if (XFS_IS_CORRUPT(log->l_mp, hlen <= 0 || hlen > bufsize)) return -EFSCORRUPTED; + if (XFS_IS_CORRUPT(log->l_mp, blkno > log->l_logBBsize || blkno > INT_MAX)) return -EFSCORRUPTED; @@ -2984,9 +2989,6 @@ xlog_do_recovery_pass( goto bread_err1; rhead = (xlog_rec_header_t *)offset; - error = xlog_valid_rec_header(log, rhead, tail_blk); - if (error) - goto bread_err1; /* * xfsprogs has a bug where record length is based on lsunit but @@ -3001,21 +3003,18 @@ xlog_do_recovery_pass( */ h_size = be32_to_cpu(rhead->h_size); h_len = be32_to_cpu(rhead->h_len); - if (h_len > h_size) { - if (h_len <= log->l_mp->m_logbsize && - be32_to_cpu(rhead->h_num_logops) == 1) { - xfs_warn(log->l_mp, + if (h_len > h_size && h_len <= log->l_mp->m_logbsize && + rhead->h_num_logops == cpu_to_be32(1)) { + xfs_warn(log->l_mp, "invalid iclog size (%d bytes), using lsunit (%d bytes)", - h_size, log->l_mp->m_logbsize); - h_size = log->l_mp->m_logbsize; - } else { - XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, - log->l_mp); - error = -EFSCORRUPTED; - goto bread_err1; - } + h_size, log->l_mp->m_logbsize); + h_size = log->l_mp->m_logbsize; } + error = xlog_valid_rec_header(log, rhead, tail_blk, h_size); + if (error) + goto bread_err1; + if ((be32_to_cpu(rhead->h_version) & XLOG_VERSION_2) && (h_size > XLOG_HEADER_CYCLE_SIZE)) { hblks = h_size / XLOG_HEADER_CYCLE_SIZE; @@ -3096,7 +3095,7 @@ xlog_do_recovery_pass( } rhead = (xlog_rec_header_t *)offset; error = xlog_valid_rec_header(log, rhead, - split_hblks ? blk_no : 0); + split_hblks ? blk_no : 0, h_size); if (error) goto bread_err2; @@ -3177,7 +3176,7 @@ xlog_do_recovery_pass( goto bread_err2; rhead = (xlog_rec_header_t *)offset; - error = xlog_valid_rec_header(log, rhead, blk_no); + error = xlog_valid_rec_header(log, rhead, blk_no, h_size); if (error) goto bread_err2; -- 2.27.0