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

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Message-ID: <20131016205800.GB26066@redhat.com>
Date:	Wed, 16 Oct 2013 22:58:00 +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:
> > Peter, just in case. I understand that this all is minor. Just I am
> > confused. And in any case I do think we do not need __GFP_ZERO when
> > it comes to PAGE_SIZE allocation.
>
> Yeah; we could probably avoid it; if only the strcpy functions would
> return how many bytes they copied :/ Then we could create a nice little
> helper to \0 the tail end for alignment.
>
> Anyway, as long as the resulting code is obvious and makes it hard to
> leak something I'm fine.

OK. I'll wait for your review on this series, then send the next patch.

d_path() case can clear the extra bytes, everything else can use a single

	if (name != buf)
		name = str*copy(tmp, buf);

to avoid the leak.

Oleg.

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