linux-kernel - Re: [PATCH 0/2] (Was: perf_event_mmap(vma) && !vma->vm

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Message-ID: <20131016205531.GA26066@redhat.com>
Date:	Wed, 16 Oct 2013 22:55:31 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] (Was: perf_event_mmap(vma) && !vma->vm_mm)

On 10/16, Peter Zijlstra wrote:
>
> On Wed, Oct 16, 2013 at 10:43:48PM +0200, Oleg Nesterov wrote:
> > Yes, we can copy the garbage to the userspace. So what? This should not
> > matter at all. Exactly because userspace should never used the data after
> > the end of string, no?
>
> Security people tell me to _never_ leak anything. I'm not near creative
> enough to exploit such a thing; but I am amazed at the techniques I do
> read about at times. So its really a better safe than sorry thing.

OK.

Still we can cleanup/simplify this. see the next email...

Oleg.

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