Messages in this thread | | | From | Konrad Rzeszutek Wilk <> | Subject | [PATCH] CVE fix for xen-blkback allowing DISCARD operations on read-only disks. | Date | Wed, 5 Jun 2013 15:54:54 -0400 |
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Please put the following patch: [PATCH] xen/blkback: Check device permissions before allowing
in your tree for Linus. It fixes CVE-2013-2140.
The bug is that if a system admin provides a disk (which supports the discard aka TRIM or SCSI UNMAP) to a guest as read-only - there are no checks done. Which means that the OS can destroy the data.
The likehood of somebody using 'ro' disks I think is small - but there is probably one person who does it and would be unhappy that a guest OS can destroy the underlaying data.
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