On Tue, 30 Aug 2016 18:40:02 -0400 Mimi Zohar <zohar at linux.vnet.ibm.com> wrote: > 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 I'll merge these into -mm to get some linux-next exposure. I don't know what your upstream merge planes will be?
