On Thu, 6 Feb 2020 at 18:33, Heinrich Schuchardt [off-list ref] wrote:

On 2/6/20 3:03 PM, Ard Biesheuvel wrote:

quoted

One of the advantages of using what basically amounts to a callback
interface into the bootloader for loading the initrd is that it provides
a natural place for the bootloader or firmware to measure the initrd
contents while they are being passed to the kernel.

Unfortunately, this is not a guarantee that the initrd will in fact be
loaded and its /init invoked by the kernel, since the command line may
contain the 'noinitrd' option, in which case the initrd is ignored, but
this will not be reflected in the PCR that covers the initrd measurement.

Does PCR here refer to the TPM Platform Configuration Register?

Yes.

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