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 AF12AAD23 for ; Thu, 27 Oct 2022 17:08:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36101C433C1; Thu, 27 Oct 2022 17:08:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666890521; bh=bjsl61PYT9FOEd16Y7AIGVPF8d9h3ANKJJDBazFCT3E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xnpW+PRQA2Lggm9bib0HBDzNG+Xim0EsmgBefNwoL9w1LoanwU04L6Q2RHTKa75sW Y0tigpO03zeFakZhsWJk/uyCLG9df0VDkPc2Tvf86vORWr9KTCgQBtOSZqE040FKqA acP0S5ncHS5LUzTOV1DZiorpYdnqiY2KIhghLs44= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Darrick J. Wong" , Dave Chinner , "Darrick J. Wong" , Chandan Babu R Subject: [PATCH 5.4 08/53] xfs: check owner of dir3 blocks Date: Thu, 27 Oct 2022 18:55:56 +0200 Message-Id: <20221027165050.134562775@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221027165049.817124510@linuxfoundation.org> References: <20221027165049.817124510@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: "Darrick J. Wong" commit 1b2c1a63b678d63e9c98314d44413f5af79c9c80 upstream. Check the owner field of dir3 block headers. If it's corrupt, release the buffer and return EFSCORRUPTED. All callers handle this properly. Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner Acked-by: Darrick J. Wong Signed-off-by: Chandan Babu R Signed-off-by: Greg Kroah-Hartman --- fs/xfs/libxfs/xfs_dir2_block.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) --- a/fs/xfs/libxfs/xfs_dir2_block.c +++ b/fs/xfs/libxfs/xfs_dir2_block.c @@ -114,6 +114,23 @@ const struct xfs_buf_ops xfs_dir3_block_ .verify_struct = xfs_dir3_block_verify, }; +static xfs_failaddr_t +xfs_dir3_block_header_check( + struct xfs_inode *dp, + struct xfs_buf *bp) +{ + struct xfs_mount *mp = dp->i_mount; + + if (xfs_sb_version_hascrc(&mp->m_sb)) { + struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; + + if (be64_to_cpu(hdr3->owner) != dp->i_ino) + return __this_address; + } + + return NULL; +} + int xfs_dir3_block_read( struct xfs_trans *tp, @@ -121,12 +138,24 @@ xfs_dir3_block_read( struct xfs_buf **bpp) { struct xfs_mount *mp = dp->i_mount; + xfs_failaddr_t fa; int err; err = xfs_da_read_buf(tp, dp, mp->m_dir_geo->datablk, -1, bpp, XFS_DATA_FORK, &xfs_dir3_block_buf_ops); - if (!err && tp && *bpp) - xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_BLOCK_BUF); + if (err || !*bpp) + return err; + + /* Check things that we can't do in the verifier. */ + fa = xfs_dir3_block_header_check(dp, *bpp); + if (fa) { + __xfs_buf_mark_corrupt(*bpp, fa); + xfs_trans_brelse(tp, *bpp); + *bpp = NULL; + return -EFSCORRUPTED; + } + + xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_BLOCK_BUF); return err; }