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LSM: LoadPin for kernel file loading restrictions

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This LSM enforces that kernel-loaded files (modules, firmware, etc)
must all come 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.

Signed-off-by: Kees Cook <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
Kees Cook 2016-04-20 15:46:28 -07:00 • committed by James Morris
commit 9b091556a0
9 changed files with 233 additions and 0 deletions
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17
Documentation/security/LoadPin.txt Normal file
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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.)