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From: Trevor Gross <tmgross@umich.edu>
Date: Mon, 5 Feb 2024 22:04:52 -0500
Message-ID: <CALNs47tX6BvGB9wVmo6Pxg9mU2FLYG51o4tT+LcTS7Kcfsd0Ow@mail.gmail.com>
Subject: Re: [PATCH v4 5/9] rust: security: add abstraction for secctx
To: Alice Ryhl <aliceryhl@google.com>
Cc: Miguel Ojeda <ojeda@kernel.org>, Alex Gaynor <alex.gaynor@gmail.com>, 
	Wedson Almeida Filho <wedsonaf@gmail.com>, Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>, 
	=?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, 
	Benno Lossin <benno.lossin@proton.me>, Andreas Hindborg <a.hindborg@samsung.com>, 
	Peter Zijlstra <peterz@infradead.org>, Alexander Viro <viro@zeniv.linux.org.uk>, 
	Christian Brauner <brauner@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, 
	=?UTF-8?B?QXJ2ZSBIasO4bm5ldsOlZw==?= <arve@android.com>, 
	Todd Kjos <tkjos@android.com>, Martijn Coenen <maco@android.com>, 
	Joel Fernandes <joel@joelfernandes.org>, Carlos Llamas <cmllamas@google.com>, 
	Suren Baghdasaryan <surenb@google.com>, Dan Williams <dan.j.williams@intel.com>, 
	Kees Cook <keescook@chromium.org>, Matthew Wilcox <willy@infradead.org>, 
	Thomas Gleixner <tglx@linutronix.de>, Daniel Xu <dxu@dxuuu.xyz>, linux-kernel@vger.kernel.org, 
	rust-for-linux@vger.kernel.org, linux-fsdevel@vger.kernel.org
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On Fri, Feb 2, 2024 at 5:57=E2=80=AFAM Alice Ryhl <aliceryhl@google.com> wr=
ote:
>
> Adds an abstraction for viewing the string representation of a security
> context.

Adds -> add

> This is needed by Rust Binder because it has feature where a process can

has feature -> has a feature

> view the string representation of the security context for incoming
> transactions. The process can use that to authenticate incoming
> transactions, and since the feature is provided by the kernel, the
> process can trust that the security context is legitimate.
>
> Reviewed-by: Benno Lossin <benno.lossin@proton.me>
> Signed-off-by: Alice Ryhl <aliceryhl@google.com>
> ---
> [...]
> diff --git a/rust/kernel/cred.rs b/rust/kernel/cred.rs
> index fabc50e48c9e..0640356a8c29 100644
> --- a/rust/kernel/cred.rs
> +++ b/rust/kernel/cred.rs
> @@ -48,6 +48,14 @@ pub unsafe fn from_ptr<'a>(ptr: *const bindings::cred)=
 -> &'a Credential {
>          unsafe { &*ptr.cast() }
>      }
>
> +    /// Get the id for this security context.
> +    pub fn get_secid(&self) -> u32 {

Since this is used in multiple places, would a typedef be useful?

    type SecurityId =3D u32;

> [...]

Reviewed-by: Trevor Gross <tmgross@umich.edu>