linux-kernel - Re: [PATCH v2 2/3] KVM: VMX: validate individual bits of guest MSR_IA32_FEATURE

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]

Message-ID: <20160616112121.fio2b3rsxdbudyfn@hz-desktop>
Date:	Thu, 16 Jun 2016 19:21:21 +0800
From:	Haozhong Zhang <haozhong.zhang@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	kvm@...r.kernel.org, rkrcmar@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Gleb Natapov <gleb@...nel.org>,
	Boris Petkov <bp@...e.de>, Tony Luck <tony.luck@...el.com>,
	Andi Kleen <andi.kleen@...el.com>,
	Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH v2 2/3] KVM: VMX: validate individual bits of guest
 MSR_IA32_FEATURE_CONTROL

On 06/16/16 11:55, Paolo Bonzini wrote:
> 
> 
> On 16/06/2016 08:05, Haozhong Zhang wrote:
> > +	/*
> > +	 * Only bits masked by msr_ia32_feature_control_valid_bits can be set in
> > +	 * msr_ia32_feature_control.
> > +	 *
> > +	 * msr_ia32_feature_control_valid_bits should be modified by
> > +	 * feature_control_valid_bits_add/del(), and only bits masked by
> > +	 * FEATURE_CONTROL_MAX_VALID_BITS can be modified.
> > +	 */
> >  	u64 msr_ia32_feature_control;
> > +	u64 msr_ia32_feature_control_valid_bits;
> 
> I noticed that the fw_cfg patch used an uint32_t.  It probably should
> use uint64_t; what you did here is correct.
>

I'll fix there.

Thanks,
Haozhong