[PATCH] x86/uaccess: Avoid barrier_nospec() in copy_from_user()

[Linus Torvalds]

On Sun, 20 Oct 2024 at 16:11, Josh Poimboeuf <jpoimboe at kernel.org> wrote:
>
> Until it's s/think/know/ can we please put something in place?

Honestly, I'm pretty damn fed up with buggy hardware and completely
theoretical attacks that have never actually shown themselves to be
used in practice.

So I think this time we push back on the hardware people and tell them
 it's *THEIR* damn problem, and if they can't even be bothered to say
yay-or-nay, we just sit tight.

Because dammit, let's put the onus on where the blame lies, and not
just take any random shit from bad hardware and say "oh, but it
*might* be a problem".

                 Linus