linux/security/loadpin
Kees Cook eba773596b LoadPin: Allow filesystem switch when not enforcing
For LoadPin to be used at all in a classic distro environment, it needs
to allow for switching filesystems (from the initramfs to the "real"
root filesystem). To allow for this, if the "enforce" mode is not set at
boot, reset the pinned filesystem tracking when the pinned filesystem
gets unmounted instead of invalidating further loads. Once enforcement
is set, it cannot be unset, and the pinning will stick.

This means that distros can build with CONFIG_SECURITY_LOADPIN=y, but with
CONFIG_SECURITY_LOADPIN_ENFORCE disabled, but after boot is running,
the system can enable enforcement:

  $ sysctl -w kernel.loadpin.enforced=1

Cc: Paul Moore <paul@paul-moore.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: linux-security-module@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Link: https://lore.kernel.org/r/20221209195746.1366607-4-keescook@chromium.org
2023-01-19 15:18:20 -08:00
..
Kconfig LoadPin: Require file with verity root digests to have a header 2022-09-07 16:37:27 -07:00
loadpin.c LoadPin: Allow filesystem switch when not enforcing 2023-01-19 15:18:20 -08:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00