Re: [PATCH] x86, kaslr: avoid setup_data when picking location

H. Peter Anvin
2014-10-01T18:14:40Z

On 10/01/2014 11:08 AM, Kees Cook wrote:
>>
>> The use of (u64) in the assignment to avoid.start gives a nuisance
>> warning on 32 bits.
>
> Ah, good catch! This should be (unsigned long), I think. Shall I send
> a follow-up patch, or do you want to fix this directly?
>

Please do.

In theory it is possible for a bootloader to put an object above 4G even
for a 32-bit kernel, but that is likely to break any kind of other
things, so I'm not worried about it. You don't need to worry about
avoiding such a zone, the problem is mostly that you can't follow the
list any further without adding PAE-handling code.

-hpa