linux-kernel - Re: kaslr relocation incompitable with kernel loaded high

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Message-ID: <53555C24.1070100@linux.intel.com>
Date:	Mon, 21 Apr 2014 10:57:56 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Yinghai Lu <yinghai@...nel.org>, WANG Chao <chaowang@...hat.com>
CC:	Kees Cook <keescook@...omium.org>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: kaslr relocation incompitable with kernel loaded high

On 04/21/2014 10:56 AM, Yinghai Lu wrote:
>>
>> 32-bit relocation outside of kernel!
> 
> Interesting, when kernel get at "early console in decompress_kernel"
> kernel already in 64 bit...
> 
> what does it mean "32-bit relocation outside of kernel" ?
> 
> why 32-bit is involved ?
> 

Most addresses and immediates on 64 bits are 32 bits wide, which is why
we have the high kernel mapping in the first place.

	-hpa


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