linux-kernel - [PATCH 2/2] jbd: ordered data integrity fix

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <488FD98D.3080708@hitachi.com>
Date:	Wed, 30 Jul 2008 12:01:33 +0900
From:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
To:	akpm@...ux-foundation.org, sct@...hat.com
Cc:	adilger@...sterfs.com, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, jack@...e.cz, jbacik@...hat.com,
	cmm@...ibm.com, tytso@....edu, snitzer@...il.com,
	tglx@...utronix.de, yumiko.sugita.yf@...achi.com,
	satoshi.oshima.fk@...achi.com
Subject: [PATCH 2/2] jbd: ordered data integrity fix

In ordered mode, if a file data buffer being dirtied exists in
the committing transaction, we write the buffer to the disk, move
it from the committing transaction to the running transaction,
then dirty it.  But we don't have to remove the buffer from the
committing transaction when the buffer couldn't be written out,
otherwise it would miss the error and the committing transaction
would not abort.

This patch adds an error check before removing the buffer from the
committing transaction.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Acked-by: Jan Kara <jack@...e.cz>
---
This patch is the same as patch 2/5 of possible filesystem corruption
fixes (take 2).  It can be found at:
http://kerneltrap.org/mailarchive/linux-kernel/2008/6/2/2002144

 fs/jbd/transaction.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

Index: linux-2.6.27-rc1/fs/jbd/transaction.c
===================================================================
--- linux-2.6.27-rc1.orig/fs/jbd/transaction.c
+++ linux-2.6.27-rc1/fs/jbd/transaction.c
@@ -954,9 +954,10 @@ int journal_dirty_data(handle_t *handle,
 	journal_t *journal = handle->h_transaction->t_journal;
 	int need_brelse = 0;
 	struct journal_head *jh;
+	int ret = 0;
 
 	if (is_handle_aborted(handle))
-		return 0;
+		return ret;
 
 	jh = journal_add_journal_head(bh);
 	JBUFFER_TRACE(jh, "entry");
@@ -1067,7 +1068,16 @@ int journal_dirty_data(handle_t *handle,
 				   time if it is redirtied */
 			}
 
-			/* journal_clean_data_list() may have got there first */
+			/*
+			 * We cannot remove the buffer with io error from the
+			 * committing transaction, because otherwise it would
+			 * miss the error and the commit would not abort.
+			 */
+			if (unlikely(!buffer_uptodate(bh))) {
+				ret = -EIO;
+				goto no_journal;
+			}
+
 			if (jh->b_transaction != NULL) {
 				JBUFFER_TRACE(jh, "unfile from commit");
 				__journal_temp_unlink_buffer(jh);
@@ -1108,7 +1118,7 @@ no_journal:
 	}
 	JBUFFER_TRACE(jh, "exit");
 	journal_put_journal_head(jh);
-	return 0;
+	return ret;
 }
 
 /**


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/