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authorKees Cook <keescook@chromium.org>2017-05-13 04:51:48 -0700
committerJonathan Corbet <corbet@lwn.net>2017-05-18 10:33:12 -0600
commit30da4f77aae99bf9ae5905d0ef89668391eea315 (patch)
tree6bdbb0f745969dc954b849c9d488c40842b6ae21 /Documentation/security
parent90bb766440f2147486a2acc3e793d7b8348b0c22 (diff)
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doc: ReSTify LoadPin.txt
Adjusts for ReST markup and moves under LSM admin guide. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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diff --git a/Documentation/security/LoadPin.txt b/Documentation/security/LoadPin.txt
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-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
-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
-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 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
-a mutable filesystem means pinning is mutable too, but having the
-sysctl allows for easy testing on systems with a mutable filesystem.)