[PATCH] ARM: ubsan: select ARCH_HAS_UBSAN_SANITIZE_ALL

[Florian Fainelli]

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 at samsung.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 at samsung.com>
>> [florian: rebased against v6.0-rc7]
>> Signed-off-by: Florian Fainelli <f.fainelli at gmail.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