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SubjectCRAMFS error "attempt to access beyond end of device"
Date
Hello -

Is there maybe a missing boundary check in cramfs that causes
accesses slightly past (up to 24 or 32K?) the end of a device?
Here's an example of a cramfs image mounted on a loop device
(the same thing happens with other block devices, and when the
kernel itself mounts a partition as cramfs-root.)

attempt to access beyond end of device
07:01: rw=0, want=1156, limit=1152
attempt to access beyond end of device
07:01: rw=0, want=1160, limit=1152
attempt to access beyond end of device
07:01: rw=0, want=1164, limit=1152

The messages appear while running "diff -r" against the original tree.
The diff itself doesn't find any problems with the filesystem.
The size of the cramfs is 1179648 bytes, or exactly 1152 * 1024.
My kernel version is 2.4.5, but this behavior has existed since
the 2.4.0-test kernels.

If anyone has ideas on this, please let me know.

- Sidik
-
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