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Message-ID: <CAKv+Gu8mT_2+Rom627pZZ0x=KU=ddR8nobWgfWVNtvxC1BgZvA@mail.gmail.com>
Date: Tue, 12 Sep 2017 07:51:06 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: Tony Lindgren <tony@...mide.com>
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
On 6 September 2017 at 21:08, Tony Lindgren <tony@...mide.com> wrote:
> * Ard Biesheuvel <ard.biesheuvel@...aro.org> [170906 11:25]:
>> Did you capture the image_size and pa_start/pa_end as well?
>
> Sorry I guess that was an incomplete copy & paste, but here's
> another one:
>
> regions.image_size:00e08000
> regions.pa_start:80000000
> regions.pa_end:871f8000
> regions.zimage_start:81000000
> regions.zimage_size:004379e8
> regions.dtb_start:86feb000
> regions.dtb_size:00012000
> regions.initrd_start:00000000
> regions.initrd_size:00000000
> count:00000028
> num:00000025
> *kaslr_offset:05e00000
> Uncompressing Linux... done, booting the kernel.
> Warning: Neither atags nor dtb found
>
>> In any case, this is the exact same offset that failed before, so the
>> rounding of pa_start wasn't the problem.
>
> OK
>
I am pretty sure this is an issue with .bss, which is not covered by
image_size (and which is absolutely *huge* btw [8+ MB] on
omap2plus_defconfig, due to lockdep being enabled by default)
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