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| author | Theodore Ts'o <tytso@mit.edu> | 2016-11-18 13:00:24 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-26 09:54:52 +0100 |
| commit | 454cf79b05c566806ead785514f36fea0b129a28 (patch) | |
| tree | 13377b3af05352efef57e5c05198e74b0323cb54 /fs/ext4/ext4.h | |
| parent | 147117cf23c0ba452f80409aec9c0be978232698 (diff) | |
| download | linux-stable-454cf79b05c566806ead785514f36fea0b129a28.tar.gz linux-stable-454cf79b05c566806ead785514f36fea0b129a28.tar.bz2 linux-stable-454cf79b05c566806ead785514f36fea0b129a28.zip | |
ext4: sanity check the block and cluster size at mount time
commit 8cdf3372fe8368f56315e66bea9f35053c418093 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 b7e921d207fb..cd5914495ad7 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -221,6 +221,7 @@ 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 |