Re: [PATCH v3 2/4] uaccess: always export _copy_[from|to]_user with CONFIG_RUST

Boqun Feng
2024-03-18T21:16:35Z

On Mon, Mar 11, 2024 at 10:47:14AM +0000, Alice Ryhl wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> 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@arndb.de>
> Tested-by: Alice Ryhl <aliceryhl@google.com>
> Signed-off-by: Alice Ryhl <aliceryhl@google.com>

Reviewed-by: Boqun Feng <boqun.feng@gmail.com>

Regards,
Boqun