Date: Fri, 24 Jul 2009 13:54:04 +0200 From: Jeremie Le Hen <jeremie@le-hen.org> To: Kostik Belousov <kostikbel@gmail.com> Cc: Ed Schouten <ed@80386.nl>, Jeremie Le Hen <jeremie@le-hen.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: concurrent sysctl implementation Message-ID: <20090724115404.GI54986@felucia.tataz.chchile.org> In-Reply-To: <20090724081842.GF55190@deviant.kiev.zoral.com.ua> References: <a0806f900905050107u4cbf0624oc83aafa54ae651f0@mail.gmail.com> <d9f479c10905050239u5d6d8304y1f63e41eabee8624@mail.gmail.com> <20090508214117.GY58540@hoeg.nl> <20090509113459.GD56667@e.0x20.net> <20090509121313.GA58540@hoeg.nl> <20090724073451.GH54986@felucia.tataz.chchile.org> <20090724081842.GF55190@deviant.kiev.zoral.com.ua>
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On Fri, Jul 24, 2009 at 11:18:42AM +0300, Kostik Belousov wrote: > On Fri, Jul 24, 2009 at 09:34:51AM +0200, Jeremie Le Hen wrote: > > Hi Ed, > > > > Sorry for the late reply. > > > > On Sat, May 09, 2009 at 02:13:13PM +0200, Ed Schouten wrote: > > > We probably could. I think I discussed this with Robert Watson some time > > > ago and we could use things like ELF hints. But still, that doesn't > > > prevent us from reaching this limitation later on. > > > > Can you elaborate a little? Are you talking about elf-hints.h? > > I don't see where we can get randomness from it. > > The thing is called ELF auxillary information vector. It is used to > supply some useful information for interpreter from the kernel, > see include/machine/elf.h for AT_* entries. Ah ok, so the idea is to generate a new hint, for instance AT_RANDOM, generated at link time, that will be used to fill the canary at exec(2) time? Regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org >
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