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Message-ID: <20110810182115.GA132@brightrain.aerifal.cx>
Date: Wed, 10 Aug 2011 14:21:15 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: Re: New daily reports - nothing
On Wed, Aug 10, 2011 at 08:23:37PM +0200, Luka Marčetić wrote:
> On 08/10/2011 07:33 PM, Rich Felker wrote:
> >What about SIZE_MAX>>(4*sizeof(size_t))?
>
> Never heard of it. What about PTRDIFF_MAX though?
My point was that SIZE_MAX>>(4*sizeof(size_t)) is an easy way to get
the square root of SIZE_MAX without long double arithmetic. PTRDIFF_T
is rather irrelevant to testing calloc overflows, where the whole
point is that A*B overflows SIZE_MAX and results in a small integer
value where the allocation will certainly succeed.
Rich
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