Re: [PATCH v2 28/33] s390/string: Add KMSAN support

[Alexander Potapenko]

On Tue, Nov 21, 2023 at 11:03 PM Ilya Leoshkevich <iii@xxxxxxxxxxxxx> wrote:
>
> Add KMSAN support for the s390 implementations of the string functions.
> Do this similar to how it's already done for KASAN, except that the
> optimized memset{16,32,64}() functions need to be disabled: it's
> important for KMSAN to know that they initialized something.
>
> The way boot code is built with regard to string functions is
> problematic, since most files think it's configured with sanitizers,
> but boot/string.c doesn't. This creates various problems with the
> memset64() definitions, depending on whether the code is built with
> sanitizers or fortify. This should probably be streamlined, but in the
> meantime resolve the issues by introducing the IN_BOOT_STRING_C macro,
> similar to the existing IN_ARCH_STRING_C macro.
>
> Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>