linux-kernel - Re: [PATCH v3 08/11] ptrace: Admit ptrace

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Date:   Thu, 5 May 2022 19:27:45 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org, rjw@...ysocki.net, mingo@...nel.org,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, mgorman@...e.de, bigeasy@...utronix.de,
        Will Deacon <will@...nel.org>, tj@...nel.org,
        linux-pm@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-xtensa@...ux-xtensa.org, Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, linux-ia64@...r.kernel.org
Subject: Re: [PATCH v3 08/11] ptrace: Admit ptrace_stop can generate spuriuos
 SIGTRAPs

On 05/05, Eric W. Biederman wrote:
>
> And yes that WARN_ON_ONCE can trigger on PREEMPT_RT but that is just
> because PREMPT_RT is currently broken with respect to ptrace.  Which
> makes a WARN_ON_ONCE appropriate.

Yes agreed. In this case WARN_ON_ONCE() can help a user to understand
that a failure was caused by the kernel problem which we need to fix
anyway.

Oleg.