path: root/security/keys/process_keys.c
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authorPhillip Lougher <phillip@lougher.org.uk>2006-12-06 20:37:20 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:36 -0800
commit8bb0269160df2a60764013994d0bc5165406cf4a (patch)
tree1d91813ab99469213ee72afe90e7341a58a7fa79 /security/keys/process_keys.c
parent[PATCH] Make initramfs printk a warning on incorrect cpio type (diff)
[PATCH] corrupted cramfs filesystems cause kernel oops
Steve Grubb's fzfuzzer tool (http://people.redhat.com/sgrubb/files/ fsfuzzer-0.6.tar.gz) generates corrupt Cramfs filesystems which cause Cramfs to kernel oops in cramfs_uncompress_block(). The cause of the oops is an unchecked corrupted block length field read by cramfs_readpage(). This patch adds a sanity check to cramfs_readpage() which checks that the block length field is sensible. The (PAGE_CACHE_SIZE << 1) size check is intentional, even though the uncompressed data is not going to be larger than PAGE_CACHE_SIZE, gzip sometimes generates compressed data larger than the original source data. Mkcramfs checks that the compressed size is always less than or equal to PAGE_CACHE_SIZE << 1. Of course Cramfs could use the original uncompressed data in this case, but it doesn't. Signed-off-by: Phillip Lougher <phillip@lougher.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security/keys/process_keys.c')
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