======= 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.)