linux-kernel - Re: [PATCH] Read THREAD_CPUTIME clock from other processes.

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Message-ID: <20110107194913.GA29536@redhat.com>
Date:	Fri, 7 Jan 2011 20:49:13 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Dario Faggioli <raistlin@...ux.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	torbenh <torbenh@....de>, john.stultz@...aro.org,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] Read THREAD_CPUTIME clock from other  processes.

On 01/07, Roland McGrath wrote:
>
> > Yes, I was worried about possible security issues too. But, it seems,
> > /proc/pid/task/tid/stat (do_task_stat) shows ->utime/stime anyway.
>
> This is constrained by ptrace_may_access(task, PTRACE_MODE_READ).

Well, ptrace_may_access() protects only get_wchan/eip/esp, but
not utime/stime.

> That's good, but it should be mentioned so that next year someone doesn't
> come back with a "there's no reason you shouldn't be able to" and go
> unchallenged.

Yes, agreed. The changelog should be improved.

Oleg.

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