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Date: Wed, 6 Sep 2017 09:22:23 -0700
From: Tony Lindgren <tony@...mide.com>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>,
	Arnd Bergmann <arnd@...db.de>, Nicolas Pitre <nico@...aro.org>,
	Russell King <linux@...linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Thomas Garnier <thgarnie@...gle.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Rutland <mark.rutland@....com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Dave Martin <dave.martin@....com>
Subject: Re: [PATCH v2 00/29] implement KASLR for ARM

* Ard Biesheuvel <ard.biesheuvel@...aro.org> [170906 03:41]:
> On 5 September 2017 at 22:31, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> > On 5 September 2017 at 22:27, Tony Lindgren <tony@...mide.com> wrote:
> >> * Ard Biesheuvel <ard.biesheuvel@...aro.org> [170905 12:43]:
> >>> Right. Well, I will try to reproduce with the BB white I have.
> >>
> >> Yeah that should be reproducable, I got it to happen on BBB here
> >> after about 5 boots.
> >>
> 
> Unfortunately, my BB white boots happily every time.
> 
> I have added DEBUG_UNCOMPRESS support to mach-omap2, and added some
> debug output to the kaslr init routine

OK. FYI, the DEBUG_UNCOMPRESS support works in Linux next as
it's now using the generic 8250 debug_ll code.

> For example,
> 
> Starting kernel ...
> 
> regions.image_size:00e00000
> regions.pa_start:80000000
> regions.pa_end:90000000
> regions.zimage_start:80200000
> regions.zimage_size:00430228
> regions.dtb_start:82000000
> regions.dtb_size:00009000
> num:00000016
> *kaslr_offset:04400000
> Uncompressing Linux... done, booting the kernel.
> [    0.000000] Booting Linux on physical CPU 0x0
>  ....
> [    0.000000] Virtual kernel memory layout:
> [    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
> [    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
> [    0.000000]     vmalloc : 0xd0000000 - 0xff800000   ( 760 MB)
> [    0.000000]     lowmem  : 0xc0000000 - 0xcfe00000   ( 254 MB)
> [    0.000000]     pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
> [    0.000000]     modules : 0xbf000000 - 0xbfe00000   (  14 MB)
> [    0.000000]       .text : 0xc4408000 - 0xc4d00000   (9184 kB)
> [    0.000000]       .init : 0xc5000000 - 0xc5100000   (1024 kB)
> [    0.000000]       .data : 0xc5100000 - 0xc5149df0   ( 296 kB)
> [    0.000000]        .bss : 0xc51cb000 - 0xc59a9a8c   (8059 kB)
> 
> I have pushed the changes to my arm-kaslr-v3 branch. If you are
> willing to spend more cycles on this, could you please run it with
> DEBUG_LL enabled, and capture the output of the failed boots?

Sure was not able to reproduce it so far on BBB. But here's
failed boot output from logicpd-torpedo-37xx-devkit. Will
try some more booting on BBB too.

Regards,

Tony

8< -------------------
Kernel image @ 0x81000000 [ 0x000000 - 0x426810 ]
## Flattened Device Tree blob at 84000000
   Booting using the fdt blob at 0x84000000
   Loading Device Tree to 86feb000, end 86fff2d5 ... OK

Starting kernel ...

regions.image_size:00e00000
regions.pa_start:80000000
regions.pa_end:88000000
regions.zimage_start:81000000
regions.zimage_size:00437830
regions.dtb_start:86feb000
regions.dtb_size:00012000
regions.initrd_start:00000000
regions.initrd_size:00000000
num:0000002f
num:00000029
*kaslr_offset:07400000
Uncompressing Linux...

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