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    Subject[PATCH v7 12/12] doc/admin-guide: update kernel.rst with CAP_PERFMON information
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    Date

    Update kernel.rst documentation file with the information
    related to usage of CAP_PERFMON capability to secure performance
    monitoring and observability operations in system.

    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
    === ==================================================================


    --
    2.20.1

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