| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 13 Dec 2011 16:48:47 -0800
From: "Darrick J. Wong" <djwong@...ibm.com>
To: Andreas Dilger <adilger.kernel@...ger.ca>,
Theodore Tso <tytso@....edu>,
"Darrick J. Wong" <djwong@...ibm.com>
Cc: Sunil Mushran <sunil.mushran@...cle.com>,
Martin K Petersen <martin.petersen@...cle.com>,
Greg Freemyer <greg.freemyer@...il.com>,
Amir Goldstein <amir73il@...il.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
Andi Kleen <andi@...stfloor.org>,
Mingming Cao <cmm@...ibm.com>,
Joel Becker <jlbec@...lplan.org>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
linux-ext4@...r.kernel.org, Coly Li <colyli@...il.com>
Subject: [PATCH 22/23] jbd2: Checksum data blocks that are stored in the
journal
Calculate and verify checksums of each data block being stored in the journal.
Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
fs/jbd2/commit.c | 22 ++++++++++++++++++++++
fs/jbd2/journal.c | 10 ++++++++--
fs/jbd2/recovery.c | 30 ++++++++++++++++++++++++++++++
3 files changed, 60 insertions(+), 2 deletions(-)
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index ccf0b6f..25bb1c3 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -339,6 +339,26 @@ static void jbd2_descr_block_csum_set(journal_t *j,
tail->t_checksum = cpu_to_be32(csum);
}
+static void jbd2_block_tag_csum_set(journal_t *j, journal_block_tag_t *tag,
+ struct buffer_head *bh, __u32 sequence)
+{
+ struct page *page = bh->b_page;
+ __u8 *addr;
+ __u32 csum;
+
+ if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ return;
+
+ sequence = cpu_to_be32(sequence);
+ addr = kmap_atomic(page, KM_USER0);
+ csum = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence,
+ sizeof(sequence));
+ csum = jbd2_chksum(j, csum, addr + offset_in_page(bh->b_data),
+ bh->b_size);
+ kunmap_atomic(addr, KM_USER0);
+
+ tag->t_checksum = cpu_to_be32(csum);
+}
/*
* jbd2_journal_commit_transaction
*
@@ -649,6 +669,8 @@ void jbd2_journal_commit_transaction(journal_t *journal)
tag = (journal_block_tag_t *) tagp;
write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr);
tag->t_flags = cpu_to_be32(tag_flag);
+ jbd2_block_tag_csum_set(journal, tag, jh2bh(new_jh),
+ commit_transaction->t_tid);
tagp += tag_bytes;
space_left -= tag_bytes;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index bc80533..ff4a870 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2005,10 +2005,16 @@ int jbd2_journal_blocks_per_page(struct inode *inode)
*/
size_t journal_tag_bytes(journal_t *journal)
{
+ journal_block_tag_t tag;
+ size_t x = 0;
+
+ if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ x += sizeof(tag.t_checksum);
+
if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT))
- return JBD2_TAG_SIZE64;
+ return x + JBD2_TAG_SIZE64;
else
- return JBD2_TAG_SIZE32;
+ return x + JBD2_TAG_SIZE32;
}
/*
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index a757d8d..3dd8544 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -390,6 +390,23 @@ static int jbd2_commit_block_csum_verify(journal_t *j, void *buf)
return provided == calculated;
}
+static int jbd2_block_tag_csum_verify(journal_t *j, journal_block_tag_t *tag,
+ void *buf, __u32 sequence)
+{
+ __u32 provided, calculated;
+
+ if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+ return 1;
+
+ sequence = cpu_to_be32(sequence);
+ calculated = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence,
+ sizeof(sequence));
+ calculated = jbd2_chksum(j, calculated, buf, j->j_blocksize);
+ provided = be32_to_cpu(tag->t_checksum);
+
+ return provided == cpu_to_be32(calculated);
+}
+
static int do_one_pass(journal_t *journal,
struct recovery_info *info, enum passtype pass)
{
@@ -566,6 +583,19 @@ static int do_one_pass(journal_t *journal,
goto skip_write;
}
+ /* Look for block corruption */
+ if (!jbd2_block_tag_csum_verify(
+ journal, tag, obh->b_data,
+ be32_to_cpu(tmp->h_sequence))) {
+ brelse(obh);
+ success = -EIO;
+ printk(KERN_ERR "JBD: Invalid "
+ "checksum recovering "
+ "block %llu in log\n",
+ blocknr);
+ continue;
+ }
+
/* Find a buffer for the new
* data being restored */
nbh = __getblk(journal->j_fs_dev,
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists