linux-kernel - Re: [PATCH v1 2/2]: Documentation/admin-guide: introduce perf-security.rst file

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Message-ID: <20181119104646.GB9761@hirez.programming.kicks-ass.net>
Date:   Mon, 19 Nov 2018 11:46:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jordan Glover <Golden_Miller83@...tonmail.ch>
Cc:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Jonatan Corbet <corbet@....net>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Tvrtko Ursulin <tursulin@...ulin.net>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v1 2/2]: Documentation/admin-guide: introduce
 perf-security.rst file

On Mon, Nov 19, 2018 at 10:35:59AM +0000, Jordan Glover wrote:
> On Monday, November 19, 2018 6:42 AM, Alexey Budankov <alexey.budankov@...ux.intel.com> wrote:
> > +>=3:
> >
> > -       Restrict *access* to PCL performance monitoring for unprivileged processes.
> >
> >
> > -       This is the default on Debian and Android [7]_ , [8]_ .
> 
> AFAIK there is no support for '+>=3' in mainline kernel[1].
> Debian and Android use out-of-tree patch for that[2].
> Maybe someone should upstream it?

NAK still stands on that. Alternative's have been proposed but so far
nobody that cared seems to care enough to implement those.