linux-kernel - Re: RETBleed: WARNING: Spectre v2 mitigation leaves CPU vulnerable to RETBleed attacks, data leaks possible!

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Message-ID: <3139s0q2-2o3s-4334-o670-n3p223o34ps9@vanv.qr>
Date:   Sun, 24 Jul 2022 11:25:04 +0200 (CEST)
From:   Jan Engelhardt <jengelh@...i.de>
To:     Adam Borowski <kilobyte@...band.pl>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>, lkft-triage@...ts.linaro.org,
        Borislav Petkov <bp@...e.de>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>
Subject: Re: RETBleed: WARNING: Spectre v2 mitigation leaves CPU vulnerable
 to RETBleed attacks, data leaks possible!


On Saturday 2022-07-23 23:50, Adam Borowski wrote:
>> > We are booting the i386 kernel on an x86 machine.
>
>[..] And for quite some tasks, halved word
>size (thus ~2/3 memory usage) can overcome register starvation and win
>benchmarks.

So how many benchmarks does a 32-bit userspace with a 32-bit kernel
win over 32-bit userspace with a 64-bit kernel?