[PATCH v7 12/12] doc/admin-guide: update kernel.rst with CAP_PERFMON information
From: Alexey Budankov <hidden>
Date: 2020-02-17 08:13:51
Also in:
intel-gfx, linux-doc, linux-man, linux-security-module, linuxppc-dev, lkml, selinux
Subsystem:
documentation, the rest · Maintainers:
Jonathan Corbet, Linus Torvalds
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 <redacted> --- 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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