Re: CVE-2024-35802: x86/sev: Fix position dependent variable references in startup code

[Michal Hocko]

On Thu 23-05-24 14:14:57, Nikolay Borisov wrote:
[...]
> I'd like to dispute this CVE since it doesn't constitute a security related
> bug. Sure, it might crash a SEV guest during boot but it doesn't constitute
> a security issue per-se.

Let me add analysis by Joerg here:
: This is not a security issue. The patch works around clangs compiler behavior
: where it inserts absolute references to kernel addresses. This breaks kernel
: boot because at the time this code runs the kernel still runs direct-mapped and
: needs to rely on RIP-relative addressing only.
: 
: Any breakage there would be detected at early boot of the kernel by a fatal
: crash, which can not be exploited. Also, our kernels are not compiled with
: clang, so from that perspective this is also not an issue for us either.

So this is a functional fix for clang builds.
-- 
Michal Hocko
SUSE Labs