Date: Wed, 17 Nov 1999 18:37:26 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Kelly Yancey <kbyanc@posi.net> Cc: freebsd-security@FreeBSD.ORG Subject: Re: kernel stack contents visible from userland Message-ID: <1854.942860246@critter.freebsd.dk> In-Reply-To: Your message of "Wed, 17 Nov 1999 12:01:40 EST." <Pine.BSF.4.05.9911171152270.8195-100000@kronos.alcnet.com>
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In message <Pine.BSF.4.05.9911171152270.8195-100000@kronos.alcnet.com>, Kelly Y ancey writes: > > Is there any security concern with a portion of the kernel's stack being >visible from userland? Not as far as I can tell. The kernel stack is per process, and the kernel generally doesn't muck with datastructures until it has checked permissions, so there doesn't seem to be much reason to take the performance overhead of zeroing out stuff. -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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