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Date:   Thu, 30 Nov 2023 11:36:35 +0100
From:   Peter Zijlstra <peterz@infradead.org>
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>,
        =?iso-8859-1?Q?Bj=F6rn?= Roy Baron <bjorn3_gh@protonmail.com>,
        Benno Lossin <benno.lossin@proton.me>,
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        Alexander Viro <viro@zeniv.linux.org.uk>,
        Christian Brauner <brauner@kernel.org>,
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        Matthew Wilcox <willy@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Daniel Xu <dxu@dxuuu.xyz>, linux-kernel@vger.kernel.org,
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Subject: Re: [PATCH 5/7] rust: file: add `Kuid` wrapper
Message-ID: <20231130103635.GA20191@noisy.programming.kicks-ass.net>
References: <20231129-alice-file-v1-0-f81afe8c7261@google.com>
 <20231129-alice-file-v1-5-f81afe8c7261@google.com>
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On Wed, Nov 29, 2023 at 01:12:17PM +0000, Alice Ryhl wrote:

> diff --git a/rust/helpers.c b/rust/helpers.c
> index fd633d9db79a..58e3a9dff349 100644
> --- a/rust/helpers.c
> +++ b/rust/helpers.c
> @@ -142,6 +142,51 @@ void rust_helper_put_task_struct(struct task_struct *t)
>  }
>  EXPORT_SYMBOL_GPL(rust_helper_put_task_struct);
>  
> +kuid_t rust_helper_task_uid(struct task_struct *task)
> +{
> +	return task_uid(task);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_task_uid);
> +
> +kuid_t rust_helper_task_euid(struct task_struct *task)
> +{
> +	return task_euid(task);
> +}
> +EXPORT_SYMBOL_GPL(rust_helper_task_euid);

Aren't these like ideal speculation gadgets? And shouldn't we avoid
functions like this for exactly that reason?