linux-kernel - Re: [PATCH v3 3/4] x86/alternative: Rewrite optimize

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 8 Feb 2023 22:01:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andrew.Cooper3@...rix.com
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mhiramat@...nel.org,
        kirill.shutemov@...ux.intel.com, jpoimboe@...hat.com
Subject: Re: [PATCH v3 3/4] x86/alternative: Rewrite optimize_nops() some

On Wed, Feb 08, 2023 at 09:44:04PM +0100, Peter Zijlstra wrote:

> Works as advertised. Next up are 8 12 byte nopes and 8 13 byte nops,
> after that we're left with:

Yeah, we can ignore those, those are the retpoline thunks being patched.
They should be totally unused. These NOPs are after an indirect jmp and
as such pure speculation food.

Arguably I should just merge that patch that turns them into UD2 --
funneling and all that.

But there was some i386 issues... oh well.