bugtraq - Re: gcc 4.1 bug miscompiles pointer range checks, may place you at risk

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Date: 3 May 2006 07:21:09 -0000
From: leonleon77@...mail.com
To: bugtraq@...urityfocus.com
Subject: Re: gcc 4.1 bug miscompiles pointer range checks, may place you
 at risk

perhaps instead of "c + len > c" being the test of pointer wraparound, one may use the following (if there is a desire to use pointer-based arithmetic)...

#define MAXPTR (char *)0xffffffff // this would differ on 64 bit systems

if (MAXPTR - c < len)
{
// we have a pointer wraparound...
}