linux-kernel - Re: [PATCH v2 4/4] rust: devres: implement register

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Message-ID: <aFlN7W5rMRcmE300@cassiopeiae>
Date: Mon, 23 Jun 2025 14:51:57 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, ojeda@...nel.org,
	alex.gaynor@...il.com, boqun.feng@...il.com, gary@...yguo.net,
	bjorn3_gh@...tonmail.com, lossin@...nel.org, a.hindborg@...nel.org,
	tmgross@...ch.edu, david.m.ertman@...el.com, ira.weiny@...el.com,
	leon@...nel.org, kwilczynski@...nel.org, bhelgaas@...gle.com,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 4/4] rust: devres: implement register_release()

On Mon, Jun 23, 2025 at 12:01:14PM +0000, Alice Ryhl wrote:
> On Sun, Jun 22, 2025 at 06:40:41PM +0200, Danilo Krummrich wrote:
> > +pub fn register_release<P>(dev: &Device<Bound>, data: P) -> Result
> > +where
> > +    P: ForeignOwnable,
> > +    for<'a> P::Borrowed<'a>: Release,
> 
> I think we need where P: ForeignOwnable + 'static too.
> 
> otherwise I can pass something with a reference that expires before the
> device is unbound and access it in the devm callback as a UAF.

I can't really come up with an example for such a case, mind providing one? :)