linux-kernel - Re: [PATCH v1 0/3] Introduce CAP_SYS_PERFMON capability for secure Perf users groups

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Message-ID: <20191205181155.GB723068@tassilo.jf.intel.com>
Date:   Thu, 5 Dec 2019 10:11:55 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        elena.reshetova@...el.com,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Stephane Eranian <eranian@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 0/3] Introduce CAP_SYS_PERFMON capability for secure
 Perf users groups

> The question isn't whether the tool could use the capability, it's whether
> the tool would also need CAP_SYS_ADMIN to be useful. Are there existing
> tools that could stop using CAP_SYS_ADMIN in favor of CAP_SYS_PERFMON?
> My bet is that any tool that does performance monitoring is going to need
> CAP_SYS_ADMIN for other reasons.

At least perf stat won't.

-Andi