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

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Message-ID: <84c32383-14a2-fa35-16b6-f9e59bd37240@linux.intel.com>
Date:   Thu, 2 Apr 2020 11:54:39 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        James Morris <jmorris@...ei.org>,
        Namhyung Kim <namhyung@...nel.org>
Cc:     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: [PATCH v8 12/12] doc/admin-guide: update kernel.rst with CAP_PERFMON
 information


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@...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