linux-kernel - Re: [RFC PATCH 23/23] x86/process: Reset hardware history in context switch

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: <20221002221238.GB17545@ranerica-svr.sc.intel.com>
Date:   Sun, 2 Oct 2022 15:12:38 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ricardo Neri <ricardo.neri@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Len Brown <len.brown@...el.com>, Mel Gorman <mgorman@...e.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Valentin Schneider <vschneid@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, "Tim C . Chen" <tim.c.chen@...el.com>
Subject: Re: [RFC PATCH 23/23] x86/process: Reset hardware history in context
 switch

On Tue, Sep 27, 2022 at 03:15:47PM +0200, Borislav Petkov wrote:
> On Fri, Sep 09, 2022 at 04:12:05PM -0700, Ricardo Neri wrote:
> > +void reset_hardware_history(void)
> > +{
> > +	if (!static_cpu_has(X86_FEATURE_HRESET))
> 
> In your whole patchset:
> 
> 	s/static_cpu_has/cpu_feature_enabled/g

Sure I can do this, Boris. I guess this implies that I also need to add the
DISABLE_MASK bits. Othewise, IIUC, cpu_feature_enabled() falls back to
static_cpu_has().

Thanks and BR,
Ricardo