linux-kernel - Re: user namespace: make signal.c respect user namespaces (v5)

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Date:	Fri, 18 Nov 2011 20:53:12 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Serge Hallyn <serge.hallyn@...onical.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>, richard@....at,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, eparis@...hat.com, oleg@...hat.com,
	dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: user namespace: make signal.c respect user namespaces (v5)

Serge Hallyn <serge.hallyn@...onical.com> writes:

> Quoting Eric W. Biederman (ebiederm@...ssion.com):
>> "Serge E. Hallyn" <serge.hallyn@...onical.com> writes:
>> 
>> > Quoting Eric W. Biederman (ebiederm@...ssion.com):
>> >> There is a small bug here.  You want to fixup q->info, not info.
>> >> Otherwise you might try dereferencing one of the special signals and get
>> >> a NULL pointer dereference.
>> >
>> > Thanks, Eric.  Oddly I've not seen this happen in quite a bit of
>> > testing with the kernel, but you certainly must be right.  I sent
>> > out a new patch to fix that.
>> 
>> You clearly have a different test case than I do.
>
> I ran a good chunk of ltp...  and it passed.  I can't explain it.

I guess my test case as mostly dinking around and hitting ctrl-c because
something wasn't behaving as I would like.

Still I a tad surprised that ltp doesn't seem to test that one.

>> I managed to trigger the oops  within about 5 minutes of just fooling
>> around.
>> 
>> You want to say &q->info not q->info in your updated patch.
>
> Oh, yes, thanks.  Sorry, I shouldn't have sent that one as I wasn't able
> to compile and test until tonight.

No problem.

Eric
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