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

[Ingo Molnar]

* H. Peter Anvin <hpa@xxxxxxxxx> wrote:

> On 05/28/2011 05:18 AM, Ingo Molnar wrote:
> > 
> > Having half a megabyte of '__init buffer' at the beginning or end 
> > of the kernel image is no big deal, it's more than enough for 
> > good randomization and makes the whole thing image-loader 
> > invariant: we can freely shift the 'real' kernel image within 
> > this larger boundary without consulting RAM maps.
> 
> Sure, but you're also blowing any attempt at PMD alignment to 
> kingdom come.

Do you mean we'd not start at a 2MB boundary and thus would waste on 
average an about 0.125 worth of huge-TLB cache entry?

That does not look like a very big issue to me - but maybe i'm 
missing something and you mean something else.

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/