Messages in this thread | | | Date | Thu, 7 Feb 2008 11:32:32 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/2] ASLR: add possibility for more fine-grained tweaking |
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* 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-)]
Ingo
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