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Message-Id: <20200221165801.32687-1-steve@sk2.org>
Date: Fri, 21 Feb 2020 17:58:01 +0100
From: Stephen Kitt <steve@....org>
To: Jonathan Corbet <corbet@....net>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Andrii Nakryiko <andriin@...com>, bpf@...r.kernel.org,
linux-doc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Stephen Kitt <steve@....org>
Subject: [PATCH] docs: sysctl/kernel: document BPF entries
Based on the implementation in kernel/bpf/syscall.c,
kernel/bpf/trampoline.c, include/linux/filter.h, and the documentation
in bpftool-prog.rst.
Signed-off-by: Stephen Kitt <steve@....org>
---
Documentation/admin-guide/sysctl/kernel.rst | 24 +++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index 1c48ab4bfe30..89c70ea7de7c 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -102,6 +102,20 @@ See the ``type_of_loader`` and ``ext_loader_ver`` fields in
:doc:`/x86/boot` for additional information.
+bpf_stats_enabled
+=================
+
+Controls whether the kernel should collect statistics on BPF programs
+(total time spent running, number of times run...). Enabling
+statistics causes a slight reduction in performance on each program
+run. The statistics can be seen using ``bpftool``.
+
+= ===================================
+0 Don't collect statistics (default).
+1 Collect statistics.
+= ===================================
+
+
cap_last_cap
============
@@ -1152,6 +1166,16 @@ NMI switch that most IA32 servers have fires unknown NMI up, for
example. If a system hangs up, try pressing the NMI switch.
+unprivileged_bpf_disabled
+=========================
+
+Writing 1 to this entry will disabled unprivileged calls to ``bpf()``;
+once disabled, calling ``bpf()`` without ``CAP_SYS_ADMIN`` will return
+``-EPERM``.
+
+Once set, this can't be cleared.
+
+
watchdog
========
--
2.20.1
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