linux-kernel - Re: [PATCH 2/5] sched,ptrace: Fix ptrace_check_attach() vs PREEMPT

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Message-ID: <Yllep6B8eva2VURJ@hirez.programming.kicks-ass.net>
Date:   Fri, 15 Apr 2022 14:01:43 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     rjw@...ysocki.net, mingo@...nel.org, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, mgorman@...e.de,
        ebiederm@...ssion.com, bigeasy@...utronix.de,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        tj@...nel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 2/5] sched,ptrace: Fix ptrace_check_attach() vs PREEMPT_RT

On Fri, Apr 15, 2022 at 12:57:56PM +0200, Oleg Nesterov wrote:
> On 04/15, Oleg Nesterov wrote:
> >
> > OK, so far it seems that this patch needs a couple of simple fixes you
> > pointed out, but before I send V2:
> >
> > 	- do you agree we can avoid JOBCTL_TRACED_FROZEN in 1-2 ?
> >
> > 	- will you agree if I change ptrace_freeze_traced() to rely
> > 	  on __state == TASK_TRACED rather than task_is_traced() ?
> >
> 
> Forgot to say, I think 1/5 needs some changes in any case...
> 
> ptrace_resume() does  wake_up_state(child, __TASK_TRACED) but doesn't
> clear JOBCTL_TRACED. The "else" branch in ptrace_stop() leaks this flag
> too.

Urgh, yes, I seemed to have missed that one :-(