linux-kernel - Re: [patch V2 1/2] sysfs/cpu: Add vulnerability folder

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Date:   Fri, 26 Jan 2018 17:35:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Dave Hansen <dave.hansen@...el.com>,
        Will Deacon <will.deacon@....com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Waiman Long <longman@...hat.com>
Subject: Re: [patch V2 1/2] sysfs/cpu: Add vulnerability folder

On Fri, Jan 26, 2018 at 05:23:31PM +0100, Andrea Arcangeli wrote:
> Hello,
> 
> On Sun, Jan 07, 2018 at 10:48:00PM +0100, Thomas Gleixner wrote:
> > +static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL);
> > +static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL);
> > +static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL);
> 
> This sysfs feature implemented as above is weakening kernel security,
> it should be 0400 above.

See the patch from Jason A. Donenfeld <Jason@...c4.com> to do just that:
	Subject: [PATCH] cpu: do not leak vulnerabilities to unprivileged users
	Message-Id: <20180125120401.30596-1-Jason@...c4.com>

I'll be queueing it up for 4.16-rc1 and backport it everywhere.

thanks,

greg k-h