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CVE-2013-2140 xen: blkback: insufficient permission checks for BLKIF_OP_DISCARD (rhbz 971146 971148)

This commit is contained in:
Josh Boyer 2013-06-05 16:10:51 -04:00
parent ca4d8d1557
commit e2d3ded7b3
2 changed files with 64 additions and 1 deletions
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11
kernel.spec
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@ -62,7 +62,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be appended after the rcX and
# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
#
%global baserelease 302
%global baserelease 303
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@ -777,6 +777,9 @@ Patch25026: Modify-UEFI-anti-bricking-code.patch
# Needed for F19 gssproxy feature
Patch25030: gssproxy-backport.patch
#CVE-2013-2140 rhbz 971146 971148
Patch25031: xen-blkback-Check-device-permissions-before-allowing.patch
# END OF PATCH DEFINITIONS
%endif
@ -1500,6 +1503,9 @@ ApplyPatch Modify-UEFI-anti-bricking-code.patch
# Needed for F19 gssproxy feature
ApplyPatch gssproxy-backport.patch
#CVE-2013-2140 rhbz 971146 971148
ApplyPatch xen-blkback-Check-device-permissions-before-allowing.patch
# END OF PATCH APPLICATIONS
%endif
@ -2327,6 +2333,9 @@ fi
# and build.
%changelog
* Wed Jun 05 2013 Josh Boyer <jwboyer@redhat.com>
- CVE-2013-2140 xen: blkback: insufficient permission checks for BLKIF_OP_DISCARD (rhbz 971146 971148)
* Tue Jun 04 2013 Josh Boyer <jwboyer@redhat.com> - 3.9.4-302
- Add gssproxy backport from J. Bruce Fields
- Fix build issue with PowerPC MSI patches (rhbz 962496)

54
xen-blkback-Check-device-permissions-before-allowing.patch Normal file
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@ -0,0 +1,54 @@
From e029d62efa5eb46831a9e1414468e582379b743f Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk () oracle com>
Date: Wed, 16 Jan 2013 11:33:52 -0500
Subject: [PATCH] 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.
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 | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index e79ab45..4119bcd 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -876,7 +876,18 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
int status = BLKIF_RSP_OKAY;
struct block_device *bdev = blkif->vbd.bdev;
unsigned long secure;
+ struct phys_req preq;
+
+ preq.sector_number = req->u.discard.sector_number;
+ preq.nr_sects = req->u.discard.nr_sectors;
+ err = xen_vbd_translate(&preq, blkif, WRITE);
+ if (err) {
+ pr_warn(DRV_PFX "access denied: DISCARD [%llu->%llu] on dev=%04x\n",
+ preq.sector_number,
+ preq.sector_number + preq.nr_sects, blkif->vbd.pdevice);
+ goto fail_response;
+ }
blkif->st_ds_req++;
xen_blkif_get(blkif);
@@ -887,7 +898,7 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
err = blkdev_issue_discard(bdev, req->u.discard.sector_number,
req->u.discard.nr_sectors,
GFP_KERNEL, secure);
-
+fail_response:
if (err == -EOPNOTSUPP) {
pr_debug(DRV_PFX "discard op failed, not supported\n");
status = BLKIF_RSP_EOPNOTSUPP;
--
1.8.1.4