From: "Darrick J. Wong" Subject: [PATCH 45/51] e2fsck: Check revoke block checksum during recovery Date: Sat, 07 Jan 2012 00:37:44 -0800 Message-ID: <20120107083744.25788.21481.stgit@elm3c44.beaverton.ibm.com> References: <20120107083256.25788.41238.stgit@elm3c44.beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Sunil Mushran , Amir Goldstein , Andi Kleen , Mingming Cao , Joel Becker , linux-ext4@vger.kernel.org, Coly Li To: Andreas Dilger , Theodore Tso , "Darrick J. Wong" Return-path: Received: from e32.co.us.ibm.com ([32.97.110.150]:34279 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751755Ab2AGIiB (ORCPT ); Sat, 7 Jan 2012 03:38:01 -0500 Received: from /spool/local by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sat, 7 Jan 2012 01:38:01 -0700 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay01.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q078bkTO119494 for ; Sat, 7 Jan 2012 01:37:46 -0700 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q078biBH026255 for ; Sat, 7 Jan 2012 01:37:46 -0700 In-Reply-To: <20120107083256.25788.41238.stgit@elm3c44.beaverton.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Verify the revoke block checksum when recovering the journal. Signed-off-by: Darrick J. Wong --- e2fsck/recovery.c | 24 ++++++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-) diff --git a/e2fsck/recovery.c b/e2fsck/recovery.c index b669941..60c8ceb 100644 --- a/e2fsck/recovery.c +++ b/e2fsck/recovery.c @@ -715,6 +715,27 @@ static int do_one_pass(journal_t *journal, return err; } +static int jbd2_revoke_block_csum_verify(journal_t *j, + void *buf) +{ + struct journal_revoke_tail *tail; + __u32 provided, calculated; + + if (!JFS_HAS_INCOMPAT_FEATURE(j, JFS_FEATURE_INCOMPAT_CSUM_V2)) + return 1; + + tail = (struct journal_revoke_tail *)(buf + j->j_blocksize - + sizeof(struct journal_revoke_tail)); + provided = tail->r_checksum; + tail->r_checksum = 0; + calculated = ext2fs_crc32c_le(~0, j->j_superblock->s_uuid, + sizeof(j->j_superblock->s_uuid)); + calculated = ext2fs_crc32c_le(calculated, buf, j->j_blocksize); + tail->r_checksum = provided; + + provided = ext2fs_be32_to_cpu(provided); + return provided == calculated; +} /* Scan a revoke record, marking all blocks mentioned as revoked. */ @@ -729,6 +750,9 @@ static int scan_revoke_records(journal_t *journal, struct buffer_head *bh, offset = sizeof(journal_revoke_header_t); max = be32_to_cpu(header->r_count); + if (!jbd2_revoke_block_csum_verify(journal, header)) + return -EINVAL; + if (JFS_HAS_INCOMPAT_FEATURE(journal, JFS_FEATURE_INCOMPAT_64BIT)) record_len = 8;