On Mon, Aug 29, 2022 at 2:45 PM Ken Goldman <kgold@xxxxxxxxxxxxx> wrote: > > On 5/4/2022 7:20 PM, Evan Green wrote: > > Enabling the kernel to be able to do encryption and integrity checks on > > the hibernate image prevents a malicious userspace from escalating to > > kernel execution via hibernation resume. [snip] > > I have a related question. > > When a TPM powers up from hibernation, PCR 10 is reset. When a > hibernate image is restored: > > 1. Is there a design for how PCR 10 is restored? I don't see anything that does that at present. > 2. How are /sys/kernel/security/ima/[pseudofiles] saved and > restored? They're part of the running kernel state, so should re-appear without any special casing. However, in the absence of anything repopulating PCR 10, they'll no longer match the in-TPM value.
