Re: [Xen-devel] [PATCH for-4.10 2/2] ubsan: disable unaligned access checks

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.10.17 at 13:36, <roger.pau@xxxxxxxxxx> wrote:
> --- a/xen/Rules.mk
> +++ b/xen/Rules.mk
> @@ -120,7 +120,7 @@ $(filter-out %.init.o $(nogcov-y),$(obj-y) $(obj-bin-y) 
> $(extra-y)): CFLAGS += -
>  endif
>  
>  ifeq ($(CONFIG_UBSAN),y)
> -$(filter-out %.init.o $(noubsan-y),$(obj-y) $(obj-bin-y) $(extra-y)): CFLAGS 
> += -fsanitize=undefined
> +$(filter-out %.init.o $(noubsan-y),$(obj-y) $(obj-bin-y) $(extra-y)): CFLAGS 
> += -fsanitize=undefined -fno-sanitize=alignment
>  endif

As was said by I think Andrew on irc, this is fine for x86 but not
fine for ARM. Even if we enable UBSAN for x86 only right now,
I think such option additions should be done in an arch-specific
way.

Jan


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