Re: [RFC][PATCH] Randomize kernel base address on boot

[H. Peter Anvin]

On 05/24/2011 02:16 PM, Ingo Molnar wrote:
> 
> On some systems holes can be pretty low as well - you'd have to research e820 
> maps submitted to lkml to see how common this is - but it's not terribly 
> common.
> 
> Some really old systems might have a hole between 15MB-16MB - but that's not an 
> issue if we load at 16 MB or higher.
> 

It definitely happens, and not just at 15-16 MiB either.

Doing this without actually consulting the memory map is dangerous as
hell; plus you have to verify that you're not clobbering anything else,
like the command line, initramfs or the linked list of data.

	-hpa
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