The TPM PCRs are only reset on a hard reboot. In order to validate a TPM's quote after a soft reboot (eg. kexec -e), the IMA measurement list of the running kernel must be saved and then restored on the subsequent boot, possibly of a different architecture. The existing securityfs binary_runtime_measurements file conveniently provides a serialized format of the IMA measurement list. This patch set serializes the measurement list in this format and restores it. Up to now, the binary_runtime_measurements was defined as architecture native format. The assumption being that userspace could and would handle any architecture conversions. With the ability of carrying the measurement list across kexec, possibly from one architecture to a different one, the per boot architecture information is lost and with it the ability of recalculating the template digest hash. To resolve this problem, without breaking the existing ABI, this patch set introduces the boot command line option "ima_canonical_fmt", which is arbitrarily defined as little endian. The need for this boot command line option will be limited to the existing version 1 format of the binary_runtime_measurements. Subsequent formats will be defined as canonical format (eg. TPM 2.0 support for larger digests). This patch set pre-req's Thiago Bauermann's "kexec_file: Add buffer hand-over for the next kernel" patch set. These patches can also be found in the next-kexec-restore branch of: git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git Mimi Andreas Steffen (1): ima: platform-independent hash value Mimi Zohar (7): ima: on soft reboot, restore the measurement list ima: permit duplicate measurement list entries ima: maintain memory size needed for serializing the measurement list ima: serialize the binary_runtime_measurements ima: store the builtin/custom template definitions in a list ima: support restoring multiple template formats ima: define a canonical binary_runtime_measurements list format Thiago Jung Bauermann (1): ima: on soft reboot, save the measurement list Documentation/kernel-parameters.txt | 4 + include/linux/ima.h | 12 ++ kernel/kexec_file.c | 4 + security/integrity/ima/Kconfig | 12 ++ security/integrity/ima/Makefile | 1 + security/integrity/ima/ima.h | 28 +++ security/integrity/ima/ima_crypto.c | 6 +- security/integrity/ima/ima_fs.c | 30 +++- security/integrity/ima/ima_init.c | 2 + security/integrity/ima/ima_kexec.c | 201 +++++++++++++++++++++ security/integrity/ima/ima_main.c | 1 + security/integrity/ima/ima_queue.c | 72 +++++++- security/integrity/ima/ima_template.c | 289 ++++++++++++++++++++++++++++-- security/integrity/ima/ima_template_lib.c | 6 +- 14 files changed, 637 insertions(+), 31 deletions(-) create mode 100644 security/integrity/ima/ima_kexec.c -- 2.1.0
