diff options
| author |   Kees Cook <keescook@chromium.org> | 2017-05-13 04:51:48 -0700 |
|---|---|---|
| committer |   Jonathan Corbet <corbet@lwn.net> | 2017-05-18 10:33:12 -0600 |
| commit | 30da4f77aae99bf9ae5905d0ef89668391eea315 (patch) | |
| tree | 6bdbb0f745969dc954b849c9d488c40842b6ae21 /Documentation/admin-guide | |
| parent | doc: ReSTify Yama.txt (diff) | |
| download | linux-dev-30da4f77aae99bf9ae5905d0ef89668391eea315.tar.xz linux-dev-30da4f77aae99bf9ae5905d0ef89668391eea315.zip | |
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>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/LSM/LoadPin.rst | 21 | ||||
| -rw-r--r-- | Documentation/admin-guide/LSM/index.rst | 1 |
2 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/admin-guide/LSM/LoadPin.rst b/Documentation/admin-guide/LSM/LoadPin.rst new file mode 100644 index 000000000000..32070762d24c --- /dev/null +++ b/Documentation/admin-guide/LSM/LoadPin.rst @@ -0,0 +1,21 @@ +======= +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 +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.) diff --git a/Documentation/admin-guide/LSM/index.rst b/Documentation/admin-guide/LSM/index.rst index e5ba2c69b8ef..41f5262359f9 100644 --- a/Documentation/admin-guide/LSM/index.rst +++ b/Documentation/admin-guide/LSM/index.rst @@ -34,6 +34,7 @@ the one "major" module (e.g. SELinux) if there is one configured. :maxdepth: 1 apparmor + LoadPin SELinux tomoyo Yama |