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Date: Tue, 8 Mar 2011 15:07:30 +0100
From: Tomas Hoger <>
Subject: Re: CVE request, php's shm

On Tue, 8 Mar 2011 14:36:49 +0100 Pierre Joye wrote:

> This flaw has been discovered by Jose Carlos Norte, already fixed in
> SVN by Felipe Pena (, see

It may be more readable to use the check as:

  if (count < 0 || count > shmop->size - size)

Previous size check gives you guarantees regarding shmop->size - size

Just my 2c.

Tomas Hoger / Red Hat Security Response Team

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