diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2016-11-18 13:00:24 -0500 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-01-15 09:49:49 -0500 |
| commit | b703a4013adddf275fb167d646d892946916a53f (patch) | |
| tree | 6358c3cb62a000ad16db36cd494d45f85def14b2 /fs/ext4/ext4.h | |
| parent | fdc4d918bc16f160680ed826bae0b6f36fbd5768 (diff) | |
ext4: sanity check the block and cluster size at mount time
[ Upstream commit 9e47a4c9fc58032ee135bf76516809c7624b1551 ]
If the block size or cluster size is insane, reject the mount. This
is important for security reasons (although we shouldn't be just
depending on this check).
Ref: http://www.securityfocus.com/archive/1/539661
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1332506
Reported-by: Borislav Petkov <bp@alien8.de>
Reported-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 6ce71e4e82e5..bd997b3d6a6f 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -233,6 +233,7 @@ struct ext4_io_submit { #define EXT4_MAX_BLOCK_SIZE 65536 #define EXT4_MIN_BLOCK_LOG_SIZE 10 #define EXT4_MAX_BLOCK_LOG_SIZE 16 +#define EXT4_MAX_CLUSTER_LOG_SIZE 30 #ifdef __KERNEL__ # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) #else |