On Tue 2008-02-05 08:58:41, Arjan van de Ven wrote:
> On Tue, 5 Feb 2008 16:46:48 +0100
> Pavel Machek <[EMAIL PROTECTED]> wrote:
>
> > Hi!
> >
> > > > In my usual dither, I'm rather hoping Arjan will have a clear
> > > > answer.
> > >
> > >
> > > setarch works. If the apps come in source form they need fixing
> > > anyway (since I'd not be surprised of current gcc reorders
> > > variables), if not.. we only have 2 cases, the other case was the
> > > build process of emacs (which got fixed 5 years ago).
> >
> > uemacs ... broken with randomization
> > colums, sss ... local programs, broken with randomization
> > procinfo ... broken, randomization makes it die sooner.
> > mikmod ... broken with randomization
> > bsdsed ... broken with randomization
> > ...
> > Should I test few more?
>
> ok throw that idea out of the window then
>
> the combo of a config option + sysctl sounds the right way forward then ;(
>
> Unless there's a way we can make sys_brk() detect this kind of behavior
> somehow...
> we could track per process if brk(0) was called, and if not, do something
> fancy to work around stuff?
That behaviour is indeed easy to detect. If someone does sys_brk()
with value lower than heap_start, it means it is old binary (but I'd
call that a hack).
But... older binaries call sys_personality(). Maybe it is cleaner not
to base check on that?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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