linux-kernel - Re: [PATCH 0/6] randomize kernel physical address and virtual address separately

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Date:	Mon, 2 Feb 2015 20:10:18 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Thomas Deutschmann <whissi@...ssi.de>
Subject: Re: [PATCH 0/6] randomize kernel physical address and virtual
 address separately

On 02/01/15 at 05:13am, Andy Lutomirski wrote:
 
> I applied this to Linus' tree today, and I get:
> 
> early console in decompress_kernel
> KASLR disabled by default...
> 
> Decompressing Linux...
> 
> XZ-compressed data is corrupt
> 
>  -- System halted
> 
> If I comment out the output = 0x140000000 line, then it boots.
> 
> With gzip instead of XZ, it just gets stuck at Decompressing Linux...
> 
> Presumably this is because 0x140000000 is an invalid address in my VM.
> I added more RAM, and I get a nice reboot loop.  QEMU thinks that it's
> a page fault causing a triple fault.
> 
> If I add in my IDT code and #PF handler, nothing changes.  If I
> re-enable relocations, I get:
> 
> 32-bit relocation outside of kernel!
> 
> Can you post the whole set of patches you're using or a link to a git tree?

Hi Andy,

Please check the related code here:
https://github.com/baoquan-he/linux/commits/kaslr-separate-random

Baoquan
Thanks
> 
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