On Mon, Oct 30, 2017 at 01:49:53PM +0100, Tobias Stoeckmann wrote:
> The utility fsck.cramfs is prone to a bus error on file systems for
> big endian systems with non-standard header sizes. While calculating
> the crc32 checksum, it does not properly handle a possible offset
> for bootcodes, resulting in out of boundary access of mmap'ed area.
>
> You can trigger the issue with the following commands:
>
> $ mkdir -p cramfs-poc/root/subdir
> $ cd cramfs-poc
> $ mkfs.cramfs -p -N big root cramfs
> $ echo -ne \\00\\x4c | dd of=cramfs bs=1 seek=518 count=2 conv=notrunc
> $ fsck.cramfs cramfs
Added between tests.
> disk-utils/fsck.cramfs.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
Applied, thanks.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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