linux-kernel - Re: [PATCH v10 4/8] rust: cred: add Rust abstraction for `struct cred`

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Message-ID: <CAHC9VhR+m5APSjS_CUO7i01RBrLoeuGC6q15cWaCELt-SPgwpw@mail.gmail.com>
Date: Thu, 19 Sep 2024 03:57:40 -0400
From: Paul Moore <paul@...l-moore.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: James Morris <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>, Miguel Ojeda <ojeda@...nel.org>, 
	Christian Brauner <brauner@...nel.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>, 
	Peter Zijlstra <peterz@...radead.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
	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>, Dan Williams <dan.j.williams@...el.com>, 
	Matthew Wilcox <willy@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Daniel Xu <dxu@...uu.xyz>, 
	Martin Rodriguez Reboredo <yakoyoku@...il.com>, Trevor Gross <tmgross@...ch.edu>, linux-kernel@...r.kernel.org, 
	linux-security-module@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v10 4/8] rust: cred: add Rust abstraction for `struct cred`

On Sun, Sep 15, 2024 at 10:31 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> From: Wedson Almeida Filho <wedsonaf@...il.com>
>
> Add a wrapper around `struct cred` called `Credential`, and provide
> functionality to get the `Credential` associated with a `File`.
>
> Rust Binder must check the credentials of processes when they attempt to
> perform various operations, and these checks usually take a
> `&Credential` as parameter. The security_binder_set_context_mgr function
> would be one example. This patch is necessary to access these security_*
> methods from Rust.
>
> This Rust abstraction makes the following assumptions about the C side:
> * `struct cred` is refcounted with `get_cred`/`put_cred`.
> * It's okay to transfer a `struct cred` across threads, that is, you do
>   not need to call `put_cred` on the same thread as where you called
>   `get_cred`.
> * The `euid` field of a `struct cred` never changes after
>   initialization.
> * The `f_cred` field of a `struct file` never changes after
>   initialization.
>
> Signed-off-by: Wedson Almeida Filho <wedsonaf@...il.com>
> Co-developed-by: Alice Ryhl <aliceryhl@...gle.com>
> Reviewed-by: Trevor Gross <tmgross@...ch.edu>
> Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
> Reviewed-by: Gary Guo <gary@...yguo.net>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
>  rust/bindings/bindings_helper.h |  1 +
>  rust/helpers/cred.c             | 13 +++++++
>  rust/helpers/helpers.c          |  1 +
>  rust/kernel/cred.rs             | 76 +++++++++++++++++++++++++++++++++++++++++
>  rust/kernel/fs/file.rs          | 13 +++++++
>  rust/kernel/lib.rs              |  1 +
>  6 files changed, 105 insertions(+)

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

-- 
paul-moore.com