linux-kernel - Re: [PATCH v5 2/4] uaccess: always export _copy_[from|to]_user with CONFIG

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Message-ID: <CAH5fLgg1UiU0b-1Wewz9Wm_V_G44G+TUb4L1beQF7mkAcCXKfg@mail.gmail.com>
Date: Tue, 16 Apr 2024 11:57:03 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Matthew Wilcox <willy@...radead.org>, 
	Al Viro <viro@...iv.linux.org.uk>, Andrew Morton <akpm@...ux-foundation.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arve Hjønnevåg <arve@...roid.com>, 
	Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, 
	Joel Fernandes <joel@...lfernandes.org>, Carlos Llamas <cmllamas@...gle.com>, 
	Suren Baghdasaryan <surenb@...gle.com>, Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH v5 2/4] uaccess: always export _copy_[from|to]_user with CONFIG_RUST

On Tue, Apr 16, 2024 at 1:05 AM Kees Cook <keescook@...omium.org> wrote:
>
> On Mon, Apr 15, 2024 at 07:13:54AM +0000, Alice Ryhl wrote:
> > From: Arnd Bergmann <arnd@...db.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@...db.de>
>
> Thanks for the updates and the comment on testing. :)
>
> Reviewed-by: Kees Cook <keescook@...omium.org>

Thanks for taking a look :)

Alice