linux-kernel - Re: [PATCH 2/6] autofs4 - remove string terminator check

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Date:	Tue, 28 Oct 2008 10:02:17 +0900
From:	Ian Kent <raven@...maw.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	autofs@...ux.kernel.org
Subject: Re: [PATCH 2/6] autofs4 - remove string terminator check


This response is a bit confusing, let me try to fix that.

On Tue, 2008-10-28 at 09:27 +0900, Ian Kent wrote:
> On Mon, 2008-10-27 at 13:31 -0700, Andrew Morton wrote:
> > On Thu, 23 Oct 2008 10:35:22 +0800
> > Ian Kent <raven@...maw.net> wrote:
> > 
> > > Remove unnecessary string terminator check.
> > 
> > Why is it unnecessary?
> > 
> > Does this change alter behaviour in any way?
> > 
> > Does it fix a bug?
> 
> Umm .... it was done in response to your comment, quoted below ...
> 
<quote>
> > +/*
> > + * Check a string doesn't overrun the chunk of
> > + * memory we copied from user land.
> > + */
> > +static int invalid_str(char *str, void *end)
> > +{
> > +     while ((void *) str <= end)
> > +             if (!*str++)
> > +                     return 0;
> > +     return -EINVAL;
> > +}
> 
> What is this?  We copy strings in from userspace in 10000 different
> places without needing checks such as this?
</quote>


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