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Commit 30da4f77 authored by Kees Cook's avatar Kees Cook Committed by Jonathan Corbet
Browse files

doc: ReSTify LoadPin.txt 



Adjusts for ReST markup and moves under LSM admin guide.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 90bb7664

Documentation/security/LoadPin.txt→Documentation/admin-guide/LSM/LoadPin.rst

+8 −4
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=======

LoadPin

=======



LoadPin is a Linux Security Module that ensures all kernel-loaded files

(modules, firmware, etc) all originate from the same filesystem, with

the expectation that such a filesystem is backed by a read-only device
@@ -5,13 +9,13 @@ such as dm-verity or CDROM. This allows systems that have a verified 
and/or unchangeable filesystem to enforce module and firmware loading

restrictions without needing to sign the files individually.



The LSM is selectable at build-time with CONFIG_SECURITY_LOADPIN, and

The LSM is selectable at build-time with ``CONFIG_SECURITY_LOADPIN``, and

can be controlled at boot-time with the kernel command line option

"loadpin.enabled". By default, it is enabled, but can be disabled at

boot ("loadpin.enabled=0").

"``loadpin.enabled``". By default, it is enabled, but can be disabled at

boot ("``loadpin.enabled=0``").



LoadPin starts pinning when it sees the first file loaded. If the

block device backing the filesystem is not read-only, a sysctl is

created to toggle pinning: /proc/sys/kernel/loadpin/enabled. (Having

created to toggle pinning: ``/proc/sys/kernel/loadpin/enabled``. (Having

a mutable filesystem means pinning is mutable too, but having the

sysctl allows for easy testing on systems with a mutable filesystem.)

Documentation/admin-guide/LSM/index.rst

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@@ -34,6 +34,7 @@ the one "major" module (e.g. SELinux) if there is one configured. 
   :maxdepth: 1



   apparmor

   LoadPin

   SELinux

   tomoyo

   Yama

MAINTAINERS

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@@ -11567,6 +11567,7 @@ M: Kees Cook <keescook@chromium.org> 
T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git lsm/loadpin

S:	Supported

F:	security/loadpin/

F:	Documentation/admin-guide/LSM/LoadPin.rst



YAMA SECURITY MODULE

M:	Kees Cook <keescook@chromium.org>