linux-kernel - Re: [Intel-gfx] [PATCH v3 4/7] drm/i915/perf: open access for CAP_SYS

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Message-ID: <503ad40c-d94e-df1d-1541-730c002ad3b7@intel.com>
Date:   Tue, 17 Dec 2019 11:45:20 +0200
From:   Lionel Landwerlin <lionel.g.landwerlin@...el.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "jani.nikula@...ux.intel.com" <jani.nikula@...ux.intel.com>,
        "joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
        "rodrigo.vivi@...el.com" <rodrigo.vivi@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Serge Hallyn <serge@...lyn.com>,
        James Morris <jmorris@...ei.org>,
        Casey Schaufler <casey@...aufler-ca.com>
Cc:     songliubraving@...com, Andi Kleen <ak@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        Jann Horn <jannh@...gle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        intel-gfx@...ts.freedesktop.org,
        Igor Lubashev <ilubashe@...mai.com>,
        linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        "selinux@...r.kernel.org" <selinux@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Brendan Gregg <bgregg@...flix.com>,
        Jiri Olsa <jolsa@...hat.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [Intel-gfx] [PATCH v3 4/7] drm/i915/perf: open access for
 CAP_SYS_PERFMON privileged process

On 16/12/2019 22:03, Alexey Budankov wrote:
> Open access to i915_perf monitoring for CAP_SYS_PERFMON privileged processes.
> For backward compatibility reasons access to i915_perf subsystem remains open
> for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN usage for secure
> i915_perf monitoring is discouraged with respect to CAP_SYS_PERFMON capability.
>
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>


Assuming people are fine with this new cap, I like this idea of a 
lighter privilege for i915-perf.


-Lionel