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

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Date:   Sun, 5 Apr 2020 17:41:48 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.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


On 05.04.2020 17:10, Arnaldo Carvalho de Melo wrote:
> 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

Trying to reproduce right now. What kind of failure do you see?
Please share some specifics so I could follow up properly.

Thanks,
Alexey

> 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
>>
>