[PATCH] kasan:fix access invalid shadow address when input is illegal

[Andrey Konovalov]

On Fri, Sep 15, 2023 at 11:40 AM 'Haibo Li' via kasan-dev
<kasan-dev at googlegroups.com> wrote:
>
> I checked inline mode just now.kasan_non_canonical_hook can print
> something like below:
>
> Unable to handle kernel paging request at virtual address ffffffb80aaaaaaa
> KASAN: maybe wild-memory-access in range [0xffffff80aaaaaaa0-0xffffff80aaaaaaaf]
>
> When addr < KASAN_SHADOW_OFFSET meets,the original addr_has_metadata should return false
> and trigger kasan_report in kasan_check_range.

It should, but I don't think it always does. But if it works for you,
let's leave it at that. I'll double check why it failed for me later.

Thanks!