[RFC PATCH v3 0/3] Safe, dynamically loadable LSM hooks

[Sargun Dhillon]

This patchset introduces safe dynamic LSM support. These are currently
not unloadable, until we figure out a use case that needs that. Adding
an unload hook is trivial given the way the patch is written.

This exposes a second mechanism of loading hooks which are in modules,
because they are behind static keys, and kept in a set of hooks which
is not marked as read only.

The point of this security feature is to resolve "unknown unknowns"
as well. Although, livepatch is excellent, sometimes, a surgical
LSM is simpler.

It includes an example LSM that prevents specific time travel.

Changes since v2:
  * inode get/set security is readded
  * xfrm singleton hook readded
  * Security hooks are turned into an array
  * Security hooks and dynamic hooks enum is collapsed

Changes since v1:
  * It no longer allows unloading of modules
  * prctl is fixed
  * inode get/set security is removed
  * xfrm singleton hook removed


Sargun Dhillon (3):
  security: Refactor LSM hooks into an array
  security: Expose a mechanism to load lsm hooks dynamically at runtime
  security: Add an example sample dynamic LSM

 include/linux/lsm_hooks.h | 454 ++++++++++++++++++++++++----------------------
 samples/Kconfig           |   6 +
 samples/Makefile          |   2 +-
 samples/lsm/Makefile      |   4 +
 samples/lsm/lsm_example.c |  33 ++++
 security/Kconfig          |   9 +
 security/inode.c          |  13 +-
 security/security.c       | 250 +++++++++++++++++++++++--
 8 files changed, 531 insertions(+), 240 deletions(-)
 create mode 100644 samples/lsm/Makefile
 create mode 100644 samples/lsm/lsm_example.c

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2.14.1