linux-kernel - Re: [PATCH v2 9/9] change the relocations behavior for kaslr on x86

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Date:	Thu, 5 Mar 2015 07:41:10 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 9/9] change the relocations behavior for kaslr on
 x86_64

On 03/04/15 at 03:16pm, Yinghai Lu wrote:
> On Mon, Mar 2, 2015 at 6:58 AM, Baoquan He <bhe@...hat.com> wrote:
> 
> > @@ -455,17 +455,16 @@ unsigned char *choose_kernel_location(struct boot_params *params,
> >                        output_size);
> 
> you forgot to change
> 
>         /* Record the various known unsafe memory ranges. */
>         mem_avoid_init((unsigned long)input, input_size,
>                        (unsigned long)output, init_size);
> 
> to
> 
>         /* Record the various known unsafe memory ranges. */
>         mem_avoid_init((unsigned long)input, input_size,
>                        (unsigned long)*output, init_size);
No, I removed output in patch 1/9 since it's not used in
mem_avoid_init(). It doesn't have this problem. But in next post it need
be done like this.

> 
> >
> >         /* Walk e820 and find a random address. */
> > -       random = find_random_addr(choice, output_size);
> > -       if (!random) {
> > +       random = find_random_phy_addr((unsigned long)*output, output_size);
> > +       if (!random)
> >                 debug_putstr("KASLR could not find suitable E820 region...\n");
> > -               goto out;
> > -       }
> > +       else
> > +               *output = (unsigned char*)random;
--
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