linux-kernel - Re: [PATCH 5/7] rust: file: add `Kuid` wrapper

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Message-ID: <20231206200224.rkdkuozztzg2wusj@moria.home.lan>
Date:   Wed, 6 Dec 2023 15:02:24 -0500
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alice Ryhl <aliceryhl@...gle.com>, 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>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        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 5/7] rust: file: add `Kuid` wrapper

On Thu, Nov 30, 2023 at 11:36:35AM +0100, Peter Zijlstra wrote:
> 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?

I think asking the Rust people to care about that is probably putting
too many constraints on them, unless you actually have an idea for
something better to do...

(loudly giving the CPU manufacturers the middle finger for making _all_
of us deal with this bullshit)