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Subject: Re: [PATCH v6 0/6] KASan for arm
To:     Marco Felsch <m.felsch@pengutronix.de>
Cc:     linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com,
        alexandre.belloni@bootlin.com, mhocko@suse.com,
        julien.thierry@arm.com, catalin.marinas@arm.com,
        linux-kernel@vger.kernel.org, dhowells@redhat.com,
        yamada.masahiro@socionext.com, ryabinin.a.a@gmail.com,
        glider@google.com, kvmarm@lists.cs.columbia.edu, corbet@lwn.net,
        liuwenliang@huawei.com, daniel.lezcano@linaro.org,
        linux@armlinux.org.uk, kasan-dev@googlegroups.com,
        bcm-kernel-feedback-list@broadcom.com, geert@linux-m68k.org,
        drjones@redhat.com, vladimir.murzin@arm.com, keescook@chromium.org,
        arnd@arndb.de, marc.zyngier@arm.com, andre.przywara@arm.com,
        philip@cog.systems, jinb.park7@gmail.com, tglx@linutronix.de,
        dvyukov@google.com, nico@fluxnic.net, gregkh@linuxfoundation.org,
        ard.biesheuvel@linaro.org, linux-doc@vger.kernel.org,
        christoffer.dall@arm.com, rob@landley.net, pombredanne@nexb.com,
        akpm@linux-foundation.org, thgarnie@google.com,
        kirill.shutemov@linux.intel.com, kernel@pengutronix.de
References: <20190617221134.9930-1-f.fainelli@gmail.com>
 <20191114181243.q37rxoo3seds6oxy@pengutronix.de>
From:   Florian Fainelli <f.fainelli@gmail.com>
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Message-ID: <7322163f-e08e-a6b7-b143-e9d59917ee5b@gmail.com>
Date:   Thu, 14 Nov 2019 15:01:19 -0800
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Sender: linux-kernel-owner@vger.kernel.org
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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