[prev in list] [next in list] [prev in thread] [next in thread] 

List:       oss-security
Subject:    [oss-security] Xen Security Advisory 94 (CVE-2014-2986) - ARM hypervisor crash on guest interrupt co
From:       Xen.org security team <security () xen ! org>
Date:       2014-04-23 15:13:02
Message-ID: E1Wcyr8-0001eE-Nk () xenbits ! xen ! org
[Download RAW message or body]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

              Xen Security Advisory CVE-2014-2986 / XSA-94
                             version 2

      ARM hypervisor crash on guest interrupt controller access

UPDATES IN VERSION 2
====================

This issue has been assigned CVE-2014-2986.

ISSUE DESCRIPTION
=================

When handling a guest access to the virtual GIC distributor (interrupt
controller) Xen could dereference a pointer before checking it for
validity leading to a hypervisor crash and host Denial of Service.

IMPACT
======

A buggy or malicious guest can crash the host.

VULNERABLE SYSTEMS
==================

Both 32- and 64-bit ARM systems are vulnerable from Xen 4.4 onward.

x86 systems are not vulnerable.

MITIGATION
==========

None.

NOTE REGARDING LACK OF EMBARGO
==============================

This bug was publicly reported on xen-devel, before it was appreciated
that there was a security problem.

CREDITS
=======

The initial bug was discovered by Thomas Leonard and the security
aspect was diagnosed by Julien Grall.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

xsa94.patch        xen-unstable, Xen 4.4.x

$ sha256sum xsa94*.patch
ad0f20577400756a1786daeafef86fa870727ec35b48f71f565e4a30dcbda58d  xsa94.patch
$
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)

iQEcBAEBAgAGBQJTV9hdAAoJEIP+FMlX6CvZmDwH/2sBH/w9kPhOu+hdOAMX3dlb
bmj1sLTehOKqEy8sZpDsCuJw8cRAIQn+xWPMDPj2lUggz5iVWHUgfs4Zk8o9l3qQ
9/RcnQQHFSw1Bu8lDLlH0FpE6R98ZcdX//PAviJewj10FiMOpIoBSzNpKLxst1IZ
5YPmBVCn6DfgsCjWYPPaGQMLtBWU/LbAPmpYUiIDywOd58OScekNL2hfKM0ZWzgo
HPuB2DwpPsj7P43kuEJyXIHYLu00see+uEXXKd591mmznVtSXSrzVVaKPjeTfh9D
WEGqCxOof5slzwofbMFflBL1SW6d6f0Llui/7cMEDITSXeCaP2wqMb34p/g68+w=
=BNcq
-----END PGP SIGNATURE-----

["xsa94.patch" (application/octet-stream)]

xen/arm: vgic: Check rank in GICD_ICFGR* emulation before locking

The function vgic_irq_rank may return NULL is the IRQ is not in range handled
by the guest. This will result to derefence a NULL pointer which will crash
Xen.

I've checked the rest of the emulation and this is only place where the lock is
taken before the rank is checked.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Reported-by: Thomas Leonard <talex5@gmail.com>
Reviewed-by: Jan Beulich <JBeulich@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
index 1b95003..4cf6470 100644
--- a/xen/arch/arm/vgic.c
+++ b/xen/arch/arm/vgic.c
@@ -602,8 +602,8 @@ static int vgic_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
     case GICD_ICFGR + 2 ... GICD_ICFGRN: /* SPIs */
         if ( dabt.size != 2 ) goto bad_width;
         rank = vgic_irq_rank(v, 2, gicd_reg - GICD_ICFGR);
-        vgic_lock_rank(v, rank);
         if ( rank == NULL) goto write_ignore;
+        vgic_lock_rank(v, rank);
         rank->icfg[REG_RANK_INDEX(2, gicd_reg - GICD_ICFGR)] = *r;
         vgic_unlock_rank(v, rank);
         return 1;





[prev in list] [next in list] [prev in thread] [next in thread]