linux-kernel - Re: [RFC] sched,livepatch: call klp_try_switch_task in __cond

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]

Message-ID: <20220509070437.GC76023@worktop.programming.kicks-ass.net>
Date:   Mon, 9 May 2022 09:04:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <song@...nel.org>
Cc:     linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        mingo@...hat.com, vincent.guittot@...aro.org, jpoimboe@...hat.com,
        joe.lawrence@...hat.com, kernel-team@...com
Subject: Re: [RFC] sched,livepatch: call klp_try_switch_task in __cond_resched

On Sat, May 07, 2022 at 10:46:28AM -0700, Song Liu wrote:
> Busy kernel threads may block the transition of livepatch. Call
> klp_try_switch_task from __cond_resched to make the transition easier.

What will a PREEMPT=y kernel do? How is it not a problem there, and if
it is, this will not help that.

That is; I don't think this can be right.