linux-kernel - Re: [PATCH 0/5] Rust support for `struct iov

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Message-ID: <2025031236-motivator-tactless-a899@gregkh>
Date: Wed, 12 Mar 2025 07:47:19 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Benno Lossin <benno.lossin@...ton.me>
Cc: Alice Ryhl <aliceryhl@...gle.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Miguel Ojeda <ojeda@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Matthew Maurer <mmaurer@...gle.com>, Lee Jones <lee@...nel.org>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 0/5] Rust support for `struct iov_iter`

On Wed, Mar 12, 2025 at 02:16:43AM +0000, Benno Lossin wrote:
> On Tue Mar 11, 2025 at 3:37 PM CET, Greg Kroah-Hartman wrote:
> > On Tue, Mar 11, 2025 at 02:25:11PM +0000, Alice Ryhl wrote:
> >> This series adds support for the `struct iov_iter` type. This type
> >> represents an IO buffer for reading or writing, and can be configured
> >> for either direction of communication.
> >> 
> >> In Rust, we define separate types for reading and writing. This will
> >> ensure that you cannot mix them up and e.g. call copy_from_iter in a
> >> read_iter syscall.
> >> 
> >> To use the new abstractions, miscdevices are given new methods read_iter
> >> and write_iter that can be used to implement the read/write syscalls on
> >> a miscdevice. The miscdevice sample is updated to provide read/write
> >> operations.
> >
> > Nice, this is good to have, but what's the odds of tieing in the
> > "untrusted buffer" logic here so that all misc drivers HAVE to properly
> > validate the data sent to them before they can touch it:
> > 	https://lore.kernel.org/r/20240925205244.873020-1-benno.lossin@proton.me
> 
> I have started to work on that again, just needed to get through several
> things in my backlog...
> 
> Are there any drivers or abstractions in mainline that I can use for
> creating the interface? Or are those still out of tree? I don't think
> that I can use tarfs for that as I did back when I started with this
> patch set, as it will probably be hopelessly out of date.

You can use the misc device api as a start, bindings for it are in the
tree, and this series here has an example that would need it directly.

thanks,

greg k-h