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corrupted cramfs filesystems cause kernel oops (CVE-2006-5823)

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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: Adrian Bunk <bunk@stusta.de>
This commit is contained in:
Phillip Lougher
2007-01-08 07:02:45 +01:00
committed by Adrian Bunk
parent 04900014a7
commit d1f34c8e3f
1 changed files with 2 additions and 0 deletions
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fs/cramfs/inode.c
+2
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@@ -482,6 +482,8 @@ static int cramfs_readpage(struct file *file, struct page * page)
pgdata = kmap(page);
if (compr_len == 0)
; /* hole */
else if (compr_len > (PAGE_CACHE_SIZE << 1))
printk(KERN_ERR "cramfs: bad compressed blocksize %u\n", compr_len);
else {
down(&read_mutex);
bytes_filled = cramfs_uncompress_block(pgdata,