Date: Fri, 16 Sep 2011 03:20:09 GMT From: Peter Wemm <peter@wemm.org> To: freebsd-threads@FreeBSD.org Subject: Re: threads/160708: Bypass process stack quota :) Message-ID: <201109160320.p8G3K90A089467@freefall.freebsd.org>
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The following reply was made to PR threads/160708; it has been noted by GNATS. From: Peter Wemm <peter@wemm.org> To: freebsd-gnats-submit@freebsd.org Cc: Subject: Re: threads/160708: Bypass process stack quota :) Date: Thu, 15 Sep 2011 19:52:18 -0700 RLIMIT_STACK is more meant as a safety measure against runaway processes rather than a security system. The limit you are looking for is: #define RLIMIT_VMEM 10 /* virtual process size (incl. mmap) */ Given that you can freely move your stack, there is nothing to stop you relocating your stack pointer to a blob of memory you got from mmap. Or even the data segment. And that is what RLIMIT_VMEM aka RLIMIT_AS are for. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI6FJV "All of this is for nothing if we don't go to the stars" - JMS/B5 "If Java had true garbage collection, most programs would delete themselves upon execution." -- Robert Sewell
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