On Fri, 2022-11-11 at 15:16 -0800, Evan Green wrote: > Introduce a new Kconfig, TCG_TPM_RESTRICT_PCR, which if enabled > restricts usermode's ability to extend or reset PCR 23. Could I re ask the question here that I asked of Matthew's patch set: https://lore.kernel.org/all/b0c4980c8fad14115daa3040979c52f07f7fbe2c.camel@xxxxxxxxxxxxx/ Which was could we use an NVRAM index in the TPM instead of a PCR? The reason for asking was that PCRs are rather precious and might get more so now that Lennart has some grand scheme for using more of them in his unified boot project. Matthew promised to play with the idea but never got back to the patch set to say whether he investigated this or not. James
