Based on kernel version 4.10.8. Page generated on 2017-04-01 14:44 EST.
1 LoadPin is a Linux Security Module that ensures all kernel-loaded files 2 (modules, firmware, etc) all originate from the same filesystem, with 3 the expectation that such a filesystem is backed by a read-only device 4 such as dm-verity or CDROM. This allows systems that have a verified 5 and/or unchangeable filesystem to enforce module and firmware loading 6 restrictions without needing to sign the files individually. 7 8 The LSM is selectable at build-time with CONFIG_SECURITY_LOADPIN, and 9 can be controlled at boot-time with the kernel command line option 10 "loadpin.enabled". By default, it is enabled, but can be disabled at 11 boot ("loadpin.enabled=0"). 12 13 LoadPin starts pinning when it sees the first file loaded. If the 14 block device backing the filesystem is not read-only, a sysctl is 15 created to toggle pinning: /proc/sys/kernel/loadpin/enabled. (Having 16 a mutable filesystem means pinning is mutable too, but having the 17 sysctl allows for easy testing on systems with a mutable filesystem.)