CVE-2024-26646

In the Linux kernel, the following vulnerability has been resolved:

thermal: intel: hfi: Add syscore callbacks for system-wide PM

The kernel allocates a memory buffer and provides its location to the

hardware, which uses it to update the HFI table. This allocation occurs

during boot and remains constant throughout runtime.

When resuming from hibernation, the restore kernel allocates a second

memory buffer and reprograms the HFI hardware with the new location as

part of a normal boot. The location of the second memory buffer may

differ from the one allocated by the image kernel.

When the restore kernel transfers control to the image kernel, its HFI

buffer becomes invalid, potentially leading to memory corruption if the

hardware writes to it (the hardware continues to use the buffer from the

restore kernel).

It is also possible that the hardware "forgets" the address of the memory

buffer when resuming from "deep" suspend. Memory corruption may also occur

in such a scenario.

To prevent the described memory corruption, disable HFI when preparing to

suspend or hibernate. Enable it when resuming.

Add syscore callbacks to handle the package of the boot CPU (packages of

non-boot CPUs are handled via CPU offline). Syscore ops always run on the

boot CPU. Additionally, HFI only needs to be disabled during "deep" suspend

and hibernation. Syscore ops only run in these cases.

[ rjw: Comment adjustment, subject and changelog edits ]