linux-kernel - Re: [PATCH v6 0/6] KASan for arm

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Message-ID: <7322163f-e08e-a6b7-b143-e9d59917ee5b@gmail.com>
Date:   Thu, 14 Nov 2019 15:01:19 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     linux-arm-kernel@...ts.infradead.org, mark.rutland@....com,
        alexandre.belloni@...tlin.com, mhocko@...e.com,
        julien.thierry@....com, catalin.marinas@....com,
        linux-kernel@...r.kernel.org, dhowells@...hat.com,
        yamada.masahiro@...ionext.com, ryabinin.a.a@...il.com,
        glider@...gle.com, kvmarm@...ts.cs.columbia.edu, corbet@....net,
        liuwenliang@...wei.com, daniel.lezcano@...aro.org,
        linux@...linux.org.uk, kasan-dev@...glegroups.com,
        bcm-kernel-feedback-list@...adcom.com, geert@...ux-m68k.org,
        drjones@...hat.com, vladimir.murzin@....com, keescook@...omium.org,
        arnd@...db.de, marc.zyngier@....com, andre.przywara@....com,
        philip@....systems, jinb.park7@...il.com, tglx@...utronix.de,
        dvyukov@...gle.com, nico@...xnic.net, gregkh@...uxfoundation.org,
        ard.biesheuvel@...aro.org, linux-doc@...r.kernel.org,
        christoffer.dall@....com, rob@...dley.net, pombredanne@...b.com,
        akpm@...ux-foundation.org, thgarnie@...gle.com,
        kirill.shutemov@...ux.intel.com, kernel@...gutronix.de
Subject: Re: [PATCH v6 0/6] KASan for arm

Hello Marco,

On 11/14/19 10:12 AM, Marco Felsch wrote:
> Hi Florian,
> 
> first of all, many thanks for your work on this series =) I picked your
> and Arnd patches to make it compilable. Now it's compiling but my imx6q
> board didn't boot anymore. I debugged the code and found that the branch
> to 'start_kernel' won't be reached
> 
> 8<------- arch/arm/kernel/head-common.S -------
> ....
> 
> #ifdef CONFIG_KASAN
>         bl      kasan_early_init
> #endif
> 	mov     lr, #0
> 	b       start_kernel
> ENDPROC(__mmap_switched)
> 
> ....
> 8<----------------------------------------------
> 
> Now, I found also that 'KASAN_SHADOW_OFFSET' isn't set due to missing
> 'CONFIG_KASAN_SHADOW_OFFSET' and so no '-fasan-shadow-offset=xxxxx' is
> added. Can that be the reason why my board isn't booted anymore?

The latest that I have is here, though not yet submitted since I needed
to solve one issue on a specific platform with a lot of memory:

https://github.com/ffainelli/linux/pull/new/kasan-v7

Can you share your branch as well? I did not pick all of Arnd's patches
since some appeared to be seemingly independent from KASan on ARM. This
is the KASAN related options that are set in my configuration:

grep KASAN build/linux-custom/.config
CONFIG_HAVE_ARCH_KASAN=y
CONFIG_CC_HAS_KASAN_GENERIC=y
CONFIG_KASAN=y
CONFIG_KASAN_GENERIC=y
CONFIG_KASAN_OUTLINE=y
# CONFIG_KASAN_INLINE is not set
CONFIG_KASAN_STACK=1
CONFIG_TEST_KASAN=m

are you using something different by any chance?
-- 
Florian