CVE ID:	CVE-2013-2140
Description:	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.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2013-2140 USN-1938-1 http://www.ubuntu.com/usn/USN-1938-1 USN-1943-1 http://www.ubuntu.com/usn/USN-1943-1 USN-1944-1 http://www.ubuntu.com/usn/USN-1944-1 USN-1945-1 http://www.ubuntu.com/usn/USN-1945-1 USN-1946-1 http://www.ubuntu.com/usn/USN-1946-1 USN-1947-1 http://www.ubuntu.com/usn/USN-1947-1 USN-2038-1 http://www.ubuntu.com/usn/USN-2038-1 USN-2039-1 http://www.ubuntu.com/usn/USN-2039-1 [oss-security] 20130605 Re: xen/blkback: Check device permissions before allowing OP_DISCARD http://www.openwall.com/lists/oss-security/2013/06/05/21 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=604c499cbbcc3d5fe5fb8d53306aa0fae1990109 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=604c499cbbcc3d5fe5fb8d53306aa0fae1990109 http://people.canonical.com/~ubuntu-security/cve/2013/CVE-2013-2140.html http://people.canonical.com/~ubuntu-security/cve/2013/CVE-2013-2140.html http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.5 http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.5 https://bugzilla.redhat.com/show_bug.cgi?id=971146 https://bugzilla.redhat.com/show_bug.cgi?id=971146 https://github.com/torvalds/linux/commit/604c499cbbcc3d5fe5fb8d53306aa0fae1990109 https://github.com/torvalds/linux/commit/604c499cbbcc3d5fe5fb8d53306aa0fae1990109