linux-kernel - Re: [PATCH v8 12/12] doc/admin-guide: update kernel.rst with CAP

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Date:   Sun, 5 Apr 2020 11:10:29 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        James Morris <jmorris@...ei.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Serge Hallyn <serge@...lyn.com>, Jiri Olsa <jolsa@...hat.com>,
        Song Liu <songliubraving@...com>,
        Andi Kleen <ak@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Igor Lubashev <ilubashe@...mai.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "selinux@...r.kernel.org" <selinux@...r.kernel.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        linux-man@...r.kernel.org
Subject: Re: [PATCH v8 12/12] doc/admin-guide: update kernel.rst with
 CAP_PERFMON information

Em Thu, Apr 02, 2020 at 11:54:39AM +0300, Alexey Budankov escreveu:
> 
> Update kernel.rst documentation file with the information
> related to usage of CAP_PERFMON capability to secure performance
> monitoring and observability operations in system.

This one is failing in my perf/core branch, please take a look. I'm
pushing my perf/core branch with this series applied, please check that
everything is ok, I'll do some testing now, but it all seems ok.

Thanks,

- Arnaldo
 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  Documentation/admin-guide/sysctl/kernel.rst | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
> index def074807cee..b06ae9389809 100644
> --- a/Documentation/admin-guide/sysctl/kernel.rst
> +++ b/Documentation/admin-guide/sysctl/kernel.rst
> @@ -720,20 +720,26 @@ perf_event_paranoid:
>  ====================
>  
>  Controls use of the performance events system by unprivileged
> -users (without CAP_SYS_ADMIN).  The default value is 2.
> +users (without CAP_PERFMON). The default value is 2.
> +
> +For backward compatibility reasons access to system performance
> +monitoring and observability remains open for CAP_SYS_ADMIN
> +privileged processes but CAP_SYS_ADMIN usage for secure system
> +performance monitoring and observability operations is discouraged
> +with respect to CAP_PERFMON use cases.
>  
>  ===  ==================================================================
>   -1  Allow use of (almost) all events by all users
>  
>       Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK
>  
> ->=0  Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN
> +>=0  Disallow ftrace function tracepoint by users without CAP_PERFMON
>  
> -     Disallow raw tracepoint access by users without CAP_SYS_ADMIN
> +     Disallow raw tracepoint access by users without CAP_PERFMON
>  
> ->=1  Disallow CPU event access by users without CAP_SYS_ADMIN
> +>=1  Disallow CPU event access by users without CAP_PERFMON
>  
> ->=2  Disallow kernel profiling by users without CAP_SYS_ADMIN
> +>=2  Disallow kernel profiling by users without CAP_PERFMON
>  ===  ==================================================================
>  
>  
> -- 
> 2.24.1
> 

-- 

- Arnaldo