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

From: Oleg Nesterov
Date: Fri Jan 07 2011 - 14:56:54 EST

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.


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