linux-kernel - Re: [PATCH] Avoid buffer overflows in get_user

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Message-ID: <Pine.LNX.4.64.0802121133090.7699@twin.jikos.cz>
Date:	Tue, 12 Feb 2008 11:35:02 +0100 (CET)
From:	Jiri Kosina <jikos@...os.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH] Avoid buffer overflows in get_user_pages()

On Mon, 11 Feb 2008, Andrew Morton wrote:

> > +	if (len <= 0)
> > +		return 0;
> >  	/* 
> >  	 * Require read or write permissions.
> >  	 * If 'force' is set, we only require the "MAY" flags.
> Can we just convert
> 	do {
> 		...
> 	} while (len);
> into
> 	while (len) {
> 		...
> 	}

How would that help?

Rather

	while (len > 0) {
		...
	}

would do the trick.

-- 
Jiri Kosina
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