Re: [PATCH] Document randomize_va_space and CONFIG_COMPAT_BRK (wasRe: [PATCH 2/2] ASLR: add possibility for more fine-grained tweaking)

[Jiri Kosina]

On Thu, 7 Feb 2008, Ingo Molnar wrote:

> i'm wondering about the following detail: i guess on 64-bit x86 kernels 
> we could default to !CONFIG_COMPAT_BRK? In 1997 there was no 64-bit x86. 
> Maybe for compat 32-bit binaries we could keep it off, but always do it 
> for 64-bit binaries.

So what do you think is proper behavior in situation when 
CONFIG_COMPAT_BRK=N on 64bit kernel, and 32bit-binary is loaded in 32bit 
emulation?

We can either leave the brk as-is, but that is in contradiction to user 
explictly specifying CONFIG_COMPAT_BRK=N. Is this what you propose?

Or we can randomize brk start in such situation, but that is the behavior 
we currently automatically have due to CONFIG_COMPAT_BRK=N, so no change 
is needed.

Thanks,

-- 
Jiri Kosina
SUSE Labs
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