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The TPM2_PCR_Event command is introduced to tss2 to allow the user to extend a specific PCR. The related data structure and unmarshal function are also introduced. However, simply invoking TPM2_PCR_Event does not automatically record the event into the TPM event log. The TPM event log is primarily maintained by the system firmware (e.g., BIOS/UEFI). Therefore, for most standard use cases, the recommended method for extending PCRs and ensuring proper event logging is to utilize the system firmware functions. There are specific scenarios where direct use of TPM2_PCR_Event becomes necessary. For instance, in environments lacking system firmware support for PCR extension, such as the grub-emu, TPM2_PCR_Event serves as the only available method to extend PCRs. Signed-off-by: Gary Lin <glin@suse.com> Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'