From: Phillip Lougher Date: Fri, 9 Mar 2012 03:02:59 +0000 (+0000) Subject: Squashfs: add mount time sanity check for block_size and block_log match X-Git-Tag: v3.4-rc1~52^2 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b0180a49f08dd1c681cdc99edc9e0cec0a833fa;p=pandora-kernel.git 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 --- Reading git-diff-tree failed