The dispatch_discard_io function in drivers/block/xen-blkback/blkback.c in
the Xen blkback implementation in the Linux kernel before 3.10.5 allows
guest OS users to cause a denial of service (data loss) via filesystem write
operations on a read-only disk that supports the (1) BLKIF_OP_DISCARD (aka
discard or TRIM) or (2) SCSI UNMAP feature.
Security, can you please close this obsolete one? Thanks