On Wed, Oct 19, 2022 at 2:37 PM 'Marco Elver' via kasan-dev <
kasan-dev@googlegroups.com> wrote:

> On Thu, Oct 20, 2022 at 04:07AM +0800, youling 257 wrote:
> > That is i did,i already test, remove "u64 __tmp…kmsan_unpoison_memory",
> no help.
> > i only remove kmsan_copy_to_user, fix my issue.
>
> Ok - does only the below work (without the reverts)?
>
> diff --git a/include/linux/kmsan-checks.h b/include/linux/kmsan-checks.h
> index c4cae333deec..eb05caa8f523 100644
> --- a/include/linux/kmsan-checks.h
> +++ b/include/linux/kmsan-checks.h
> @@ -73,8 +73,8 @@ static inline void kmsan_unpoison_memory(const void
> *address, size_t size)
>  static inline void kmsan_check_memory(const void *address, size_t size)
>  {
>  }
> -static inline void kmsan_copy_to_user(void __user *to, const void *from,
> -                                     size_t to_copy, size_t left)
> +static __always_inline void kmsan_copy_to_user(void __user *to, const
> void *from,
> +                                              size_t to_copy, size_t left)
>  {
>  }
>
>
> ... because when you say only removing kmsan_copy_to_user() (from
> instrument_put_user()) works, it really doesn't make any sense. The only
> explanation would be if the compiler inlining is broken.
>
>
If what Marco suggests does not help, could you post the output of `nm -S
vmlinux` with and without your revert so that we can see which functions
were affected by the change?

Unfortunately the top results are of no help, do you have the `perf` tool
available in your system?


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