Date: Wed, 15 Jun 2011 17:44:19 -0700 From: Julian Elischer <julian@freebsd.org> To: Scott Long <scottl@samsco.org> Cc: Luigi Rizzo <rizzo@iet.unipi.it>, "K. Macy" <kmacy@freebsd.org>, current@freebsd.org Subject: Re: fast/syscall-free gettimeofday ? Message-ID: <4DF951E3.7010209@freebsd.org> In-Reply-To: <4A46AC77-BEE5-4401-8896-4E4F1A5304B0@samsco.org> References: <20110614161105.GA17306@onelab2.iet.unipi.it> <BANLkTinOq73nGQT88NByuOgH3ByuA=ZLJA@mail.gmail.com> <4A46AC77-BEE5-4401-8896-4E4F1A5304B0@samsco.org>
next in thread | previous in thread | raw e-mail | index | archive | help
> If this was to be extended with cached global syscall information like gettimeofday, would we want that to be in a separate page that is marked non-executable? Is there any way to trick the kernel into leaking arbitrary (and thus executable) code? Also, would it matter for jails? Per-process info like getpid would obviously have to be a separate per-process page. > > Scott > In the talk about this sort of topic I have seen mention at various times of a page per system, a page per jail, a page per process and a page per thread. I'm not saying we want this all just that I've seen it mentionned.. The per-thread one is the most intersting to do challenge wise.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4DF951E3.7010209>