On Thu, 7 Feb 2008, Ingo Molnar wrote:
quoted text > * Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> wrote:
> > On Wed, 6 Feb 2008, Ingo Molnar wrote:
> > > @@ -541,6 +541,18 @@ config ELF_CORE
> > > help
> > > Enable support for generating core dumps. Disabling saves about 4k.
> > >
> > > +config COMPAT_BRK
> > > + bool "Disable heap randomization"
> > > + default y
> > > + help
> > > + Randomizing heap placement makes heap exploits harder, but it
> > > + also breaks ancient binaries (including anything libc5 based).
> > > + This option changes the bootup default to heap randomization
> > > + disabled, and can be overriden runtime by setting
> > > + /proc/sys/kernel/randomize_va_space to 2.
> > > +
> > > + On non-ancient distros (post-2000 ones) Y is usually a safe choice.
> >
> > Somehow my belly feeling tells me something is wrong with this description...
> >
> > Ah, a negative option (Y -> disable). So Y is always safe.
> >
> > `non-ancient distros' really means `recent distros', and if you have
> > one, then _N_ should be a safe choice, too?
>
> yeah, you are right :-) I'll fix this.
>
> btw., "non-ancient distros" does not just mean "recent distros", it
> really means "just about any distro you picked up in the past 10 years".
> You'd have to go out on a limb to find something historic (or keep
> copying /lib/libc5 binaries to new distros like Pavel did) to still have
> this particular libc5 assumption/breakage. [ Or at least so i hope =B-)]
Bummer, I guess my good old m68k recovery ramdisk is affected ;-)
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Network and Software Technology Center Europe
The Corporate Village
