linux-kernel - Re: [PATCH] rust_binder: add Rust Binder driver

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Message-ID: <CAHC9VhSPo4+gSqR2g-6yvDtYGyAnQ4scw2_vQCUrKzbBBd790A@mail.gmail.com>
Date: Thu, 18 Sep 2025 11:51:54 -0400
From: Paul Moore <paul@...l-moore.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arve Hjønnevåg <arve@...roid.com>, 
	Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, 
	Joel Fernandes <joelagnelf@...dia.com>, Christian Brauner <brauner@...nel.org>, 
	Carlos Llamas <cmllamas@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>, Miguel Ojeda <ojeda@...nel.org>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
	Serge Hallyn <sergeh@...nel.org>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, Wedson Almeida Filho <wedsonaf@...il.com>, 
	Matt Gilbride <mattgilbride@...gle.com>
Subject: Re: [PATCH] rust_binder: add Rust Binder driver

On Thu, Sep 18, 2025 at 6:19 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> Please see the attached link to the original RFC for motivation.
>
> I did not include all of the tracepoints as I felt that the mechansim
> for making C access fields of Rust structs should be discussed on list
> separately. I also did not include the support for building Rust Binder
> as a module since that requires exporting a bunch of additional symbols
> on the C side.
>
> Link: https://lore.kernel.org/r/20231101-rust-binder-v1-0-08ba9197f637@google.com
> Co-developed-by: Wedson Almeida Filho <wedsonaf@...il.com>
> Signed-off-by: Wedson Almeida Filho <wedsonaf@...il.com>
> Co-developed-by: Matt Gilbride <mattgilbride@...gle.com>
> Signed-off-by: Matt Gilbride <mattgilbride@...gle.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
>  drivers/android/Kconfig                       |   15 +-
>  drivers/android/Makefile                      |    1 +
>  drivers/android/binder/Makefile               |    9 +
>  drivers/android/binder/allocation.rs          |  602 +++++++++
>  drivers/android/binder/context.rs             |  180 +++
>  drivers/android/binder/deferred_close.rs      |  204 +++
>  drivers/android/binder/defs.rs                |  182 +++
>  drivers/android/binder/dummy.c                |   15 +
>  drivers/android/binder/error.rs               |   99 ++
>  drivers/android/binder/freeze.rs              |  388 ++++++
>  drivers/android/binder/node.rs                | 1131 +++++++++++++++++
>  drivers/android/binder/node/wrapper.rs        |   78 ++
>  drivers/android/binder/page_range.rs          |  746 +++++++++++
>  drivers/android/binder/page_range_helper.c    |   24 +
>  drivers/android/binder/page_range_helper.h    |   15 +
>  drivers/android/binder/process.rs             | 1696 +++++++++++++++++++++++++
>  drivers/android/binder/range_alloc/array.rs   |  251 ++++
>  drivers/android/binder/range_alloc/mod.rs     |  329 +++++
>  drivers/android/binder/range_alloc/tree.rs    |  488 +++++++
>  drivers/android/binder/rust_binder.h          |   23 +
>  drivers/android/binder/rust_binder_events.c   |   59 +
>  drivers/android/binder/rust_binder_events.h   |   36 +
>  drivers/android/binder/rust_binder_internal.h |   87 ++
>  drivers/android/binder/rust_binder_main.rs    |  627 +++++++++
>  drivers/android/binder/rust_binderfs.c        |  850 +++++++++++++
>  drivers/android/binder/stats.rs               |   89 ++
>  drivers/android/binder/thread.rs              | 1596 +++++++++++++++++++++++
>  drivers/android/binder/trace.rs               |   16 +
>  drivers/android/binder/transaction.rs         |  456 +++++++
>  include/uapi/linux/android/binder.h           |    2 +-
>  rust/bindings/bindings_helper.h               |    8 +
>  rust/helpers/binder.c                         |   26 +
>  rust/helpers/helpers.c                        |    1 +
>  rust/helpers/page.c                           |    8 +
>  rust/helpers/security.c                       |   24 +
>  rust/kernel/cred.rs                           |    6 +
>  rust/kernel/page.rs                           |    6 +
>  rust/kernel/security.rs                       |   37 +
>  rust/uapi/uapi_helper.h                       |    1 +
>  39 files changed, 10409 insertions(+), 2 deletions(-)

This is a pretty big patch, in the future it might be nice to
decompose things like this into a multi-part patchset.  Regardless,
the LSM/security bits look okay to me.

Acked-by: Paul Moore <paul@...l-moore.com>

-- 
paul-moore.com