From: Ulrich Drepper <drepper@redhat.com>
To: Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>
Cc: libc-hacker@sources.redhat.com
Subject: Re: [PATCH] xdr_array and calloc security fix
Date: Fri, 02 Aug 2002 02:43:00 -0000 [thread overview]
Message-ID: <3D4A5446.5030204@redhat.com> (raw)
In-Reply-To: <20020802092945.24679.qmail@md.dent.med.uni-muenchen.de>
Wolfram Gloger wrote:
> Do we already have some system-specific mechanism to detect the rare
> overflow case for a 32bit-multiplication without having to perform a
> division?
It should be possible to have something like
((a | b) > (a * b))
for unsigned values. I'm not 100% sure, though.
--
---------------. ,-. 1325 Chesapeake Terrace
Ulrich Drepper \ ,-------------------' \ Sunnyvale, CA 94089 USA
Red Hat `--' drepper at redhat.com `------------------------
next prev parent reply other threads:[~2002-08-02 9:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-01 15:46 Jakub Jelinek
2002-08-02 0:20 ` Ulrich Drepper
2002-08-02 2:29 ` Wolfram Gloger
2002-08-02 2:43 ` Ulrich Drepper [this message]
2002-08-02 2:50 ` Ulrich Drepper
2002-08-02 2:56 ` Jakub Jelinek
2002-08-02 4:07 ` Andreas Schwab
2002-08-02 4:46 ` Jakub Jelinek
2002-08-02 4:57 ` Wolfram Gloger
2002-08-02 5:05 ` Jakub Jelinek
2002-08-02 5:13 ` Wolfram Gloger
2002-08-03 5:03 ` [PATCH] optimize calloc Jakub Jelinek
2002-08-03 12:02 ` Ulrich Drepper
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