linux-kernel - Re: RT scheduling and a way to make a process hang, unkillable

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Date:	Tue, 17 Feb 2009 16:09:18 -0800
From:	Corey Hickey <bugfood-ml@...ooh.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, mtk.manpages@...il.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: RT scheduling and a way to make a process hang, unkillable

Peter Zijlstra wrote:
> On Tue, 2009-02-17 at 15:45 +0530, Dhaval Giani wrote:
> 
>> sched: Don't allow setuid to succeed if the user does not have rt bandwidth
>>
>> Corey Hickey reported that on using setuid to change the uid of a
>> rt process, the process would be unkillable and not be running.
>> This is because there was no rt runtime for that user group. Add
>> in a check to see if a user can attach an rt task to its task group.
> 
> This looks good to me.
> 
> Does anybody object to the -ENOSPC return value? Should we introduce
> -ENOTIME for that?

setuid() failed: No space left on device

For what it's worth, a message like that would be confusing to me if I
didn't already know the context. It's not a big problem in my opinion,
though; I'm just happy there's an error at all, now. :)

I just tested patch v6 and it works nicely for me. Again, thanks a bunch
for the attention to this issue.

-Corey
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