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SubjectRe: [PATCH v8 12/12] doc/admin-guide: update kernel.rst with CAP_PERFMON information
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On 05.04.2020 17:41, Alexey Budankov wrote:
>
> 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

Please try applying this:

---
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 335696d3360d..aaa5bbcd1e33 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -709,7 +709,13 @@ 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.
@@ -718,13 +724,13 @@ users (without CAP_SYS_ADMIN). The default value is 2.
``CAP_IPC_LOCK``.

>=0 Disallow ftrace function tracepoint by users without
- ``CAP_SYS_ADMIN``.
+ ``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``.
=== ==================================================================

---
Thanks,
Alexey

>
> 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@linux.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
>>>
>>

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