linux-kernel - Re: [PATCH] ARM: ubsan: select ARCH_HAS_UBSAN_SANITIZE

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Message-ID: <b6abc730-21a2-91ee-5424-f473b29abd90@gmail.com>
Date:   Fri, 30 Sep 2022 14:34:53 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Kees Cook <keescook@...omium.org>,
        William Zhang <william.zhang@...adcom.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        Nick Hawkins <nick.hawkins@....com>,
        John Crispin <john@...ozen.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nicolas Schier <n.schier@....de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        open list <linux-kernel@...r.kernel.org>,
        bcm-kernel-feedback-list@...adcom.com, anand.gore@...adcom.com
Subject: Re: [PATCH] ARM: ubsan: select ARCH_HAS_UBSAN_SANITIZE_ALL

On 9/29/22 01:10, Kees Cook wrote:
> On Wed, Sep 28, 2022 at 05:33:14PM -0700, William Zhang wrote:
>>
>>
>> On 09/28/2022 04:06 PM, Florian Fainelli wrote:
>>> On 9/28/22 11:01, Kees Cook wrote:
>>>> On Wed, Sep 28, 2022 at 10:47:39AM -0700, Florian Fainelli wrote:
>>>>> From: Seung-Woo Kim <sw0312.kim@...sung.com>
>>>>>
>>>>> To enable UBSAN on ARM, this patch enables ARCH_HAS_UBSAN_SANITIZE_ALL
>>>>> from arm confiuration. Basic kernel bootup test is passed on arm with
>>>>> CONFIG_UBSAN_SANITIZE_ALL enabled.
>>>>>
>>>>> Signed-off-by: Seung-Woo Kim <sw0312.kim@...sung.com>
>>>>> [florian: rebased against v6.0-rc7]
>>>>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
>>>>
>>>> Ah-ha, thanks for testing this. What devices did you check this on? I
>>>> know boot-up on arm32 can be very device-specific.
>>>
>>> This was tested on an ARCH_BRCMSTB system which is using an ARMv8 CPU
>>> booted in AArch32 mode, so virtually equivalent to armv7l. A raspberry
>>> Pi 4B is also happily booting with it.
>>>
>>>>
>>>> Which UBSAN configs did you try?
>>>
>>> All CONFIG_UBSAN_* work with the exception of CONFIG_UBSAN_ALIGNMENT on
>>> my ARCH_BRCMSTB system, however it works fine on the Raspberry Pi 4B.
>>> Florian
>>
>> I also tested on a BCM63138 board (ARM A9) under ARCH_BCMBCA using the
>> multi_v7_defconfig with all the UBSAN configs enabled except UBSAN_ALIGNMENT
>> and board boots up fine. Turning on UBSAN_ALIGNMENT results in flood of
>> false positive misaligned-access warnings. This is fine as ARM supports
>> unaligned access.
>>
>> It did catch an out-of-band bug in mach-sunxi smp code.  I will submit a
>> separate patch to fix that bug.
> 
> Yay! :) Move coverage is great. :)
> 
>>
>> Tested-by: William Zhang <william.zhang@...adcom.com>

Submitted to the patch tracker:

https://www.armlinux.org.uk/developer/patches/viewpatch.php?id=9253/1
-- 
Florian