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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
- 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.)
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