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(parent: 7c4d7d7) | patch
xen/blkback: Check device permissions before allowing OP_DISCARD
authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Wed, 16 Jan 2013 16:33:52 +0000 (11:33 -0500)
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Fri, 7 Jun 2013 21:05:55 +0000 (17:05 -0400)
commit604c499cbbcc3d5fe5fb8d53306aa0fae1990109
treeab604a42d397957a3aeb55c343d59648d6332c30tree | snapshot (tar.gz zip)
parent7c4d7d710f7eb499ec483f25acc28b53adaa3260commit | diff
xen/blkback: Check device permissions before allowing OP_DISCARD

We need to make sure that the device is not RO or that
the request is not past the number of sectors we want to
issue the DISCARD operation for.

This fixes CVE-2013-2140.

Cc: stable@vger.kernel.org
Acked-by: Jan Beulich <JBeulich@suse.com>
Acked-by: Ian Campbell <Ian.Campbell@citrix.com>
[v1: Made it pr_warn instead of pr_debug]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
drivers/block/xen-blkback/blkback.c diff | blob | blame | history