linux-ext4 - [PATCH] jbd2: gate checksum calculations on crc driver presence, not sb flags

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Message-ID: <20150930174708.GJ10391@birch.djwong.org>
Date:	Wed, 30 Sep 2015 10:47:08 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	Jan Kara <jack@...e.com>, "Theodore Ts'o" <tytso@....edu>
Cc:	Nikolay Borisov <kernel@...p.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	SiteGround Operations <operations@...eground.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: [PATCH] jbd2: gate checksum calculations on crc driver presence, not
 sb flags

Change the journal's checksum functions to gate on whether or not the
crc32c driver is loaded, and gate the loading on the superblock bits.
This prevents a journal crash if someone loads a journal in no-csum
mode and then randomizes the superblock, thus flipping on the feature
bits.

Reported-by: Nikolay Borisov <kernel@...p.com>
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/jbd2/journal.c    |   12 +++++++++---
 include/linux/jbd2.h |   10 ++++++----
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 8270fe9..16e3a46 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -122,9 +122,15 @@ EXPORT_SYMBOL(__jbd2_debug);
 #endif
 
 /* Checksumming functions */
+static bool journal_has_csum_v2or3_feature(journal_t *j)
+{
+	return JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2) ||
+	       JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V3);
+}
+
 static int jbd2_verify_csum_type(journal_t *j, journal_superblock_t *sb)
 {
-	if (!jbd2_journal_has_csum_v2or3(j))
+	if (!journal_has_csum_v2or3_feature(j))
 		return 1;
 
 	return sb->s_checksum_type == JBD2_CRC32C_CHKSUM;
@@ -1531,7 +1537,7 @@ static int journal_get_superblock(journal_t *journal)
 		goto out;
 	}
 
-	if (jbd2_journal_has_csum_v2or3(journal) &&
+	if (journal_has_csum_v2or3_feature(journal) &&
 	    JBD2_HAS_COMPAT_FEATURE(journal, JBD2_FEATURE_COMPAT_CHECKSUM)) {
 		/* Can't have checksum v1 and v2 on at the same time! */
 		printk(KERN_ERR "JBD2: Can't enable checksumming v1 and v2/3 "
@@ -1545,7 +1551,7 @@ static int journal_get_superblock(journal_t *journal)
 	}
 
 	/* Load the checksum driver */
-	if (jbd2_journal_has_csum_v2or3(journal)) {
+	if (journal_has_csum_v2or3_feature(journal)) {
 		journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
 		if (IS_ERR(journal->j_chksum_driver)) {
 			printk(KERN_ERR "JBD2: Cannot load crc32c driver.\n");
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index df07e78..c74c786 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1340,11 +1340,13 @@ extern size_t journal_tag_bytes(journal_t *journal);
 
 static inline int jbd2_journal_has_csum_v2or3(journal_t *journal)
 {
-	if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2) ||
-	    JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V3))
-		return 1;
+	WARN_ON_ONCE((JBD2_HAS_INCOMPAT_FEATURE(journal,
+				JBD2_FEATURE_INCOMPAT_CSUM_V2) ||
+		 JBD2_HAS_INCOMPAT_FEATURE(journal,
+				JBD2_FEATURE_INCOMPAT_CSUM_V3)) &&
+		     journal->j_chksum_driver == NULL);
 
-	return 0;
+	return journal->j_chksum_driver != NULL;
 }
 
 /*
--
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