The Trenchboot project focus on boot security has led to the enabling of the Linux kernel to be directly invocable by the x86 Dynamic Launch instruction(s) for establishing a Dynamic Root of Trust for Measurement (DRTM). The dynamic launch will be initiated by a boot loader with associated support added to it, for example the first targeted boot loader will be GRUB2. An integral part of establishing the DRTM involves measuring everything that is intended to be run (kernel image, initrd, etc) and everything that will configure that kernel to run (command line, boot params, etc) into specific PCRs, the DRTM PCRs (17-22), in the TPM. Another key aspect is the dynamic launch is rooted in hardware. On Intel this is done using the GETSEC instruction set provided by Intel’s TXT and the SKINIT instruction provided by AMD’s AMD-V. Information on these technologies can be readily found online.[…]
https://lkml.org/lkml/2020/3/25/982
https://github.com/trenchboot
Firmware Security 