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SubjectRe: 2.6.23-rc3-mm1 - memory layout change? - lost support for MAP_32BIT? - mono crashes
(some more CCs added)

On Thu, 23 Aug 2007, Andrew Morton wrote:

> It is quite unobvious to me that the whole pie-randomization thing is
> worth merging. Why shouldn't we just drop the lot?

Hi Andrew,

well, whenever it comes to address space layout randomization, there
usually follows a huge debate whether it is needed or not, some people
think it's useful and powerful security protection against 0day attacks,
other people think that it's just fighting the bugs in userspace software
in a wrong way.

Opinions differ, that's why there is a way to turn the VA space
randomization completely off trivially.

We already have randomized stack, randomized mmap base, randomized vdso
page in mainline kernel, but code and heap still stay on deterministic
addresses. I think providing the possibility for users to have really full
address space randomization (if they want to) is much better than
providing the current slightly crippled state, when some parts of address
space are randomized and some are not. Or do you think we should rather
rip all the randomization off?

And it's almost certain to me that users want this functionality - look
major distros. They seem to have out-of-tree patches to provide this
functionality to their users, IMHO.


Jiri Kosina
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