As there are 24 PCR's in TPM 1.2 specification. Some of these PCRs are
reserved and cannot be extended by user's code. Below are the PCR Index
with their Usage
1. CRTM, BIOS and Platform Extensions
2. Platform Configuration
3. Option ROM Code
4. Option ROM Configuration and Data
5. IPL7Code (MBR Information and Bootloader Stage 1)
6. IPL Code and Configuration Data (for use by IPL Code)
7. State Transition and Wake Events
8. Reserved for future usage. Do not use.
9. Bootloader Stage 2 Part 1
10. Bootloader Stage 2 Part 2
11. Not in Use.
12. Not in Use.
13. Bootloader Command line Arguments
14. Files checked via check-file routine
15. Files which are actually loaded (e.g. Linux kernel, initrd,
modules..)
16. Not in Use.
17. Not in Use.
18. DRTM
18-23. Not in Use.
what I understood that a user can extend all the PCR's which are not in
use? Is this correct? I asked this question Because I have written my own
code to extend PCR's (by following
https://www.cylab.cmu.edu/tiw/slides/challener-handout.pdf) and it turns
out that i can extend all the PCR's except from PCR 17 to PCR 22. And my
understanding was that I can only extend few and especially cannot play
with the lower ones from PCR 0 to PCR 7.
Your help is highly appreciated! I can send the code as well if required!
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