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From: Oleg Nesterov <oleg@redhat.com>
To: bsegall@google.com
Cc: linux-kernel@vger.kernel.org, Roland McGrath <roland@hack.frob.com>
Subject: Re: [PATCH] ptrace: fix PTRACE_LISTEN race corrupting task->state
Date: Wed, 22 Feb 2017 18:03:25 +0100	[thread overview]
Message-ID: <20170222170325.GB15968@redhat.com> (raw)
In-Reply-To: <20170222165538.GA15968@redhat.com>

On 02/22, Oleg Nesterov wrote:
>
> note also that PTRACE_LISTEN itself can do ptrace_signal_wake_up(true),

please ignore, in this case the __TASK_TRACED at the start of _unfreeze()
saves us.

> 
> > This causes it to instead clobber TASK_WAKING,
> 
> even if it is already TASK_RUNNING it is simply wrong to set TASK_TRACED
> in both cases, right?
> 
> Thanks. The patch looks good at first glance, but let me think a bit...
> perhaps we should change PTRACE_LISTEN instead, not sure.
> 
> Oleg.

  reply	other threads:[~2017-02-22 17:15 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-21 18:47 [PATCH] ptrace: fix PTRACE_LISTEN race corrupting task->state bsegall
2017-02-22 16:55 ` Oleg Nesterov
2017-02-22 17:03   ` Oleg Nesterov [this message]
2017-02-22 17:56   ` bsegall
2017-02-24 16:36 ` Oleg Nesterov
2017-02-27 18:08   ` bsegall
2017-04-04 21:47   ` [PATCHv2] " bsegall
2017-04-04 21:53     ` Andrew Morton
2017-04-05 12:36       ` Oleg Nesterov
2017-04-05 12:30     ` Oleg Nesterov

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