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For tpm2_key_protector and grub-protect, SHA-256 is chosen as the hash algorithm for the TPM session. However, grub-protect mistakenly used the hash algorithm of the PCR bank to calculate PCR digest. If the user chose a PCR bank other than SHA-256, grub-protect created a non-SHA-256 PCR digest to seal the key. But, tpm2_key_protector expects a SHA-256 PCR digest to the TPM unsealing session, so it would fail due to digest mismatch. This commit fixes the hash algorithm of PCR digest in grub-protect to avoid the potential unsealing failure. Fixes: https://github.com/lcp/grub2/issues/4 Signed-off-by: Gary Lin <glin@suse.com> Reviewed-by: Stefan Berger <stefanb@linux.ibm.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'