Re: [PATCH RFC 1/7] x86/head/64: Mark startup_gdt and startup_gdt_descr as __initdata

From: Ingo Molnar
Date: Wed Oct 18 2023 - 07:46:04 EST



* H. Peter Anvin <hpa@xxxxxxxxx> wrote:

> If the goal is better KASLR, then what we really should spend time on was
> Kristen Accardi's fgKASLR patches, which not only exponentially(!)
> increases the randomization entrophy but also *actually* avoids the "one
> leak and it's over" problem.

Agreed. Going by this version of function-granularity KASLR from 3 years
ago:

https://lwn.net/Articles/824307/
https://lwn.net/ml/linux-kernel/20200623172327.5701-1-kristen@xxxxxxxxxxxxxxx/

The fgKASLR feature looks entirely viable to me. Back then I presumed it
would get iterated beyond v3, and then it fell off my radar. :-/

If Kristen or someone else would like to dust this off & submit a fresh
version it would be much appreciated!

Thanks,

Ingo