Add support for architecture-specific IMA policies

IMA can measure and appraise kernel images, but requires the appropriate policy to be set to do so. This patch set adds the ability for different architectures to define their own arch-specific default policies to be loaded at run-time by implementing the arch_ima_get_policy() function. This allows for the policy to be loaded based on the current system state, such as secure boot state.

Included is an example patch that loads a set of IMA appraise rules requiring the kexec kernel images to be measured and signed when EFI secure boot is enabled.

This set also contains a patch to IMA that adds a separate appraise func= specifically for the kexec_load syscall. IMA cannot appraise images loaded with kexec_load, and therefore automatically fails the signature check -- effectively disabling the syscall when the appropriate appraise rule is set. This allows for the kexec_load syscall to be "disabled" via IMA policy, but not conflict with the existing kexec_file_load signature verification.

Eric Richter (2):
ima: add support for KEXEC_ORIG_KERNEL_CHECK
x86/ima: define arch_get_ima_policy() for x86

Nayna Jain (2):
ima: add support for arch specific policies
ima: add support for external setting of ima_appraise

 Documentation/ABI/testing/ima_policy  |   1 +
 arch/x86/kernel/Makefile              |   2 +
 arch/x86/kernel/ima_arch.c            |  27 +++++++++
 include/linux/ima.h                   |  13 +++++
 security/integrity/ima/Kconfig        |   8 +++
 security/integrity/ima/ima.h          |   7 +++
 security/integrity/ima/ima_appraise.c |  11 +++-
 security/integrity/ima/ima_main.c     |   3 +-
 security/integrity/ima/ima_policy.c   | 103 ++++++++++++++++++++++++++++++++++
 9 files changed, 172 insertions(+), 3 deletions(-)
 create mode 100644 arch/x86/kernel/ima_arch.c

2.14.4