linux-kernel - [PATCHv3 09/10] KVM: x86 emulator: fix RDPMC privilege check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 10 Nov 2011 14:57:29 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, avi@...hat.com, mtosatti@...hat.com,
	mingo@...e.hu, a.p.zijlstra@...llo.nl, acme@...stprotocols.net
Subject: [PATCHv3 09/10] KVM: x86 emulator: fix RDPMC privilege check

From: Avi Kivity <avi@...hat.com>

RDPMC is only privileged if CR4.PCE=0.  check_rdpmc() already implements this,
so all we need to do is drop the Priv flag.

Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Gleb Natapov <gleb@...hat.com>
---
 arch/x86/kvm/emulate.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8547958..c0ee85b 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3254,7 +3254,7 @@ static struct opcode twobyte_table[256] = {
 	DI(ImplicitOps | Priv, wrmsr),
 	IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),
 	DI(ImplicitOps | Priv, rdmsr),
-	DIP(ImplicitOps | Priv, rdpmc, check_rdpmc),
+	DIP(ImplicitOps, rdpmc, check_rdpmc),
 	I(ImplicitOps | VendorSpecific, em_sysenter),
 	I(ImplicitOps | Priv | VendorSpecific, em_sysexit),
 	N, N,
-- 
1.7.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/