Date: Wed, 30 Nov 2005 12:18:26 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Ulrich Spoerlein <q@galgenberg.net> Cc: Jason Evans <jasone@canonware.com>, current@freebsd.org Subject: Re: New libc malloc patch Message-ID: <6861.1133349506@critter.freebsd.dk> In-Reply-To: Your message of "Wed, 30 Nov 2005 12:10:17 %2B0100." <20051130111017.GA67032@galgenberg.net>
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In message <20051130111017.GA67032@galgenberg.net>, Ulrich Spoerlein writes: >I just read that mmap() part and have to wonder: Is it possible to >introduce something like the guard pages that OpenBSD has implemented? >I'd love to try this out and see the dozens of applications that fail >due to off-by-one bugs. Guard-pages are very expensive and that is why I have not adopted OpenBSD's patch. I would advocate that people use one of the dedicated debugging malloc implementations (ElectricFence ?) instead of putting too much overhead into our default malloc. For all practical purposes, the options J, A, X & Z are the most commonly used. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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