linux-hardening - Re: [PATCH v3] sched/core: Address classes via __begin_sched

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 PHC
Open Source and information security mailing list archives

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

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

Date:   Wed, 18 May 2022 00:22:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Christophe de Dinechin <dinechin@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3] sched/core: Address classes via __begin_sched_classes

On Tue, May 17, 2022 at 10:35:44AM -0700, Kees Cook wrote:

> What you've got below is almost exactly what I had in my first attempt
> at this (that I never posted). What I was missing and couldn't track
> down were the places you used sched_class_above(). I should have sent
> _that_ patch and asked where the comparisons were that I couldn't find.
> I think what you've got is much cleaner, as it makes the for loop use
> the normal iterator idiom.

Don't feel too bad; I forgot about the comparison in
check_preempt_curr() myself and cursed a while trying to figure out why
it stopped booting.

Anyway; I suppose I'll go queue the thing in sched/core so we can forget
about all this again.