Re: [PATCH v5 2/4] uaccess: always export _copy_[from|to]_user with CONFIG_RUST

[Kees Cook]

On Mon, Apr 15, 2024 at 07:13:54AM +0000, Alice Ryhl wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> Rust code needs to be able to access _copy_from_user and _copy_to_user
> so that it can skip the check_copy_size check in cases where the length
> is known at compile-time, mirroring the logic for when C code will skip
> check_copy_size. To do this, we ensure that exported versions of these
> methods are available when CONFIG_RUST is enabled.
> 
> Alice has verified that this patch passes the CONFIG_TEST_USER_COPY test
> on x86 using the Android cuttlefish emulator.
> 
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Thanks for the updates and the comment on testing. :)

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook