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From e029d62efa5eb46831a9e1414468e582379b743f Mon Sep 17 00:00:00 2001
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From: Konrad Rzeszutek Wilk <konrad.wilk () oracle com>
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Date: Wed, 16 Jan 2013 11:33:52 -0500
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Subject: [PATCH] xen/blkback: Check device permissions before allowing
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OP_DISCARD
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We need to make sure that the device is not RO or that
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the request is not past the number of sectors we want to
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issue the DISCARD operation for.
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Cc: stable () vger kernel org
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Acked-by: Jan Beulich <JBeulich () suse com>
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Acked-by: Ian Campbell <Ian.Campbell () citrix com>
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[v1: Made it pr_warn instead of pr_debug]
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Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk () oracle com>
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---
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drivers/block/xen-blkback/blkback.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
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index e79ab45..4119bcd 100644
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--- a/drivers/block/xen-blkback/blkback.c
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+++ b/drivers/block/xen-blkback/blkback.c
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@@ -876,7 +876,18 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
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int status = BLKIF_RSP_OKAY;
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struct block_device *bdev = blkif->vbd.bdev;
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unsigned long secure;
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+ struct phys_req preq;
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+
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+ preq.sector_number = req->u.discard.sector_number;
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+ preq.nr_sects = req->u.discard.nr_sectors;
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+ err = xen_vbd_translate(&preq, blkif, WRITE);
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+ if (err) {
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+ pr_warn(DRV_PFX "access denied: DISCARD [%llu->%llu] on dev=%04x\n",
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+ preq.sector_number,
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+ preq.sector_number + preq.nr_sects, blkif->vbd.pdevice);
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+ goto fail_response;
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+ }
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blkif->st_ds_req++;
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xen_blkif_get(blkif);
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@@ -887,7 +898,7 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
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err = blkdev_issue_discard(bdev, req->u.discard.sector_number,
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req->u.discard.nr_sectors,
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GFP_KERNEL, secure);
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-
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+fail_response:
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if (err == -EOPNOTSUPP) {
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pr_debug(DRV_PFX "discard op failed, not supported\n");
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status = BLKIF_RSP_EOPNOTSUPP;
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--
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1.8.1.4
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