[PATCH v8 04/12] perf tool: extend Perf tool with CAP_PERFMON capability support

[Namhyung Kim]

Hello,

On Thu, Apr 2, 2020 at 5:47 PM Alexey Budankov
<alexey.budankov at linux.intel.com> wrote:
>
>
> Extend error messages to mention CAP_PERFMON capability as an option
> to substitute CAP_SYS_ADMIN capability for secure system performance
> monitoring and observability operations. Make perf_event_paranoid_check()
> and __cmd_ftrace() to be aware of CAP_PERFMON capability.
>
> CAP_PERFMON implements the principal of least privilege for performance
> monitoring and observability operations (POSIX IEEE 1003.1e 2.2.2.39
> principle of least privilege: A security design principle that states
> that a process or program be granted only those privileges (e.g.,
> capabilities) necessary to accomplish its legitimate function, and only
> for the time that such privileges are actually required)
>
> For backward compatibility reasons access to perf_events subsystem remains
> open for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN usage for
> secure perf_events monitoring is discouraged with respect to CAP_PERFMON
> capability.
>
> Signed-off-by: Alexey Budankov <alexey.budankov at linux.intel.com>
> Reviewed-by: James Morris <jamorris at linux.microsoft.com>

Acked-by: Namhyung Kim <namhyung at kernel.org>

Thanks
Namhyung