[PATCH 0/3] support for duplicate measurement of integrity critical data

Tushar Sugandhi tusharsu at linux.microsoft.com
Sat Jan 30 00:45:16 UTC 2021

IMA does not measure duplicate buffer data since TPM extend is a very
expensive operation.  However, in some cases for integrity critical
data, the measurement of duplicate data is necessary to accurately
determine the current state of the system.  Eg, SELinux state changing
from 'audit', to 'enforcing', and back to 'audit' again.  In this
example, currently, IMA will not measure the last state change to
'audit'.  This limits the ability of attestation services to accurately
determine the current state of the integrity critical data on the

This series addresses this gap by providing the ability to measure
duplicate entries for integrity critical data, driven by policy.

This series is based on the following repo/branch/commit:
 repo: https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
 branch: next-integrity-testing
 commit b3f82afc1041 ("IMA: Measure kernel version in early boot") 

Tushar Sugandhi (3):
  IMA: add policy condition to measure duplicate critical data
  IMA: update functions to read allow_dup policy condition
  IMA: add support to measure duplicate buffer for critical data hook

 Documentation/ABI/testing/ima_policy  |  4 +++-
 security/integrity/ima/ima.h          |  8 +++----
 security/integrity/ima/ima_api.c      | 15 +++++++------
 security/integrity/ima/ima_appraise.c |  2 +-
 security/integrity/ima/ima_init.c     |  2 +-
 security/integrity/ima/ima_main.c     |  9 ++++----
 security/integrity/ima/ima_policy.c   | 31 ++++++++++++++++++++++++---
 security/integrity/ima/ima_queue.c    |  5 +++--
 8 files changed, 54 insertions(+), 22 deletions(-)


More information about the Linux-security-module-archive mailing list