linux-kernel - Re: [PATCH v3 2/9] rust: cred: add Rust abstraction for `struct cred`

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Date: Wed, 24 Jan 2024 09:51:11 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...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>, Andreas Hindborg <a.hindborg@...sung.com>, Peter Zijlstra <peterz@...radead.org>, Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, 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>, Kees Cook <keescook@...omium.org>, Matthew Wilcox <willy@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 2/9] rust: cred: add Rust abstraction for `struct cred`

On 19.01.24 10:52, Alice Ryhl wrote:
> On Fri, Jan 19, 2024 at 10:37 AM Benno Lossin <benno.lossin@...ton.me> wrote:
>> On 1/18/24 15:36, Alice Ryhl wrote:
>>> +    /// Returns the effective UID of the given credential.
>>> +    pub fn euid(&self) -> bindings::kuid_t {
>>> +        // SAFETY: By the type invariant, we know that `self.0` is valid.
>>
>> Is `euid` an immutable property, or why does this memory access not race
>> with something?
> 
> Yes. These properties are changed by replacing the credential, so the
> credentials themselves are immutable.

I see that's good to know, I think that should be mentioned
on the docs of `Credential`.

-- 
Cheers,
Benno