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author | Phillip Lougher <phillip@squashfs.org.uk> | 2012-03-09 03:02:59 +0000 |
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committer | Phillip Lougher <phillip@squashfs.org.uk> | 2012-03-10 03:01:02 +0000 |
commit | 4b0180a49f08dd1c681cdc99edc9e0cec0a833fa (patch) | |
tree | 816d9a9095b816683c8edc2089d510880fd59d35 /fs/reiserfs/tail_conversion.c | |
parent | 2158d3fd2769546cd9004eaeb776fee946155238 (diff) |
Squashfs: add mount time sanity check for block_size and block_log match
Squashfs currently has a sanity check for block_size less than or
equal to the maximum block_size (1 Mbyte). This catches some
superblock corruption, but obviously with a block_size maximum
of 1 Mbyte there's 7 correct values (4K, 8K, 16K, 32K, ... etc) and
a lot of incorrect values which are not caught by this check.
The Squashfs superblock, however, has both a block_size and
a block_log (2^block_log == block_size). Checking that the block_size
matches the block_log is a much more robust check. Corruption of the
superblock is unlikely to produce values which match, and it also
ensures the block_size is an exact power of two.
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Diffstat (limited to 'fs/reiserfs/tail_conversion.c')
0 files changed, 0 insertions, 0 deletions