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 20762AD23 for ; Thu, 27 Oct 2022 17:08:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B033C433D6; Thu, 27 Oct 2022 17:08:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666890519; bh=uGYPfYYkc1TtEswX7nRZimrzhucPIs5kIr4u7uUOjyI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QF+LEqb4wibJMnSrVw9TWbhkmQG4zhQpTaBhVyaP0z1O+fB039ury3ZbKRobZjdUh d6r/MReOyYDlIwVg9Boh9lJ4EC+cxvAOc/hd35zQ7jOajYuUYTbBkGLKqKs93kRvXa bJvrXrAhjTT35bcog6X3UuDINU0M/rXn5/VzTNjE= 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 07/53] xfs: check owner of dir3 data blocks Date: Thu, 27 Oct 2022 18:55:55 +0200 Message-Id: <20221027165050.094729532@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 a10c21ed5d5241d11cf1d5a4556730840572900b upstream. [Slightly edit xfs_dir3_data_read() to work with existing mapped_bno argument instead of flag values introduced in later kernels] Check the owner field of dir3 data 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_data.c | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) --- a/fs/xfs/libxfs/xfs_dir2_data.c +++ b/fs/xfs/libxfs/xfs_dir2_data.c @@ -348,6 +348,22 @@ static const struct xfs_buf_ops xfs_dir3 .verify_write = xfs_dir3_data_write_verify, }; +static xfs_failaddr_t +xfs_dir3_data_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_data_hdr *hdr3 = bp->b_addr; + + if (be64_to_cpu(hdr3->hdr.owner) != dp->i_ino) + return __this_address; + } + + return NULL; +} int xfs_dir3_data_read( @@ -357,12 +373,24 @@ xfs_dir3_data_read( xfs_daddr_t mapped_bno, struct xfs_buf **bpp) { + xfs_failaddr_t fa; int err; err = xfs_da_read_buf(tp, dp, bno, mapped_bno, bpp, XFS_DATA_FORK, &xfs_dir3_data_buf_ops); - if (!err && tp && *bpp) - xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF); + if (err || !*bpp) + return err; + + /* Check things that we can't do in the verifier. */ + fa = xfs_dir3_data_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_DATA_BUF); return err; }