linux-kernel - Re: [PATCH v10 5/8] rust: security: add abstraction for secctx

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Message-ID: <CAHC9VhQmgQP=WPGdg_2fGUAuKLQ0V2DF8FWXhfVrou=RdLE4bg@mail.gmail.com>
Date: Thu, 19 Sep 2024 03:56:34 -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 5/8] rust: security: add abstraction for secctx

On Sun, Sep 15, 2024 at 10:31 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> Add an abstraction for viewing the string representation of a security
> context.
>
> This is needed by Rust Binder because it has a feature where a process
> can 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.
>
> This abstraction makes the following assumptions about the C side:
> * When a call to `security_secid_to_secctx` is successful, it returns a
>   pointer and length. The pointer references a byte string and is valid
>   for reading for that many bytes.
> * The string may be referenced until `security_release_secctx` is
>   called.
> * If CONFIG_SECURITY is set, then the three methods mentioned in
>   rust/helpers are available without a helper. (That is, they are not a
>   #define or `static inline`.)
>
> Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
> Reviewed-by: Trevor Gross <tmgross@...ch.edu>
> Reviewed-by: Gary Guo <gary@...yguo.net>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
>  rust/bindings/bindings_helper.h |  1 +
>  rust/helpers/helpers.c          |  1 +
>  rust/helpers/security.c         | 20 +++++++++++
>  rust/kernel/cred.rs             |  8 +++++
>  rust/kernel/lib.rs              |  1 +
>  rust/kernel/security.rs         | 74 +++++++++++++++++++++++++++++++++++++++++
>  6 files changed, 105 insertions(+)

I doubt my ACK is strictly necessary here since the Rust bindings
aren't actually modifying anything in the LSM, but just in case ...

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

-- 
paul-moore.com