linux-kernel - Re: [Xen-devel] [PATCH] x86/xen: Make sure X2APIC_ENABLE bit of MSR_IA32

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] [day] [month] [year] [list]

Message-ID: <54E5EFD0.1090100@citrix.com>
Date:	Thu, 19 Feb 2015 14:14:40 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<david.vrabel@...rix.com>, <konrad.wilk@...cle.com>
CC:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] x86/xen: Make sure X2APIC_ENABLE bit of MSR_IA32_APICBASE
 is not set

On 11/02/15 19:39, Boris Ostrovsky wrote:
> Commit d524165cb8db ("x86/apic: Check x2apic early") tests X2APIC_ENABLE
> bit of MSR_IA32_APICBASE when CONFIG_X86_X2APIC is off and panics
> the kernel when this bit is set.
> 
> Xen's PV guests will pass this MSR read to the hypervisor which will
> return its version of the MSR, where this bit might be set. Make sure
> we clear it before returning MSR value to the caller.

Applied to stable/for-linus-3.20, thanks.

David
--
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/