linux-kernel - Re: [PATCH v4 6/6] rust: use strict provenance APIs

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Message-ID: <CAJ-ks9ntUhnD2D1qUCosrKk2bEYHXFDLEanznpNn51d6CbD6aw@mail.gmail.com>
Date: Sun, 16 Mar 2025 08:54:06 -0400
From: Tamir Duberstein <tamird@...il.com>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, Brendan Higgins <brendan.higgins@...ux.dev>, 
	David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Luis Chamberlain <mcgrof@...nel.org>, 
	Russ Weight <russ.weight@...ux.dev>, Rob Herring <robh@...nel.org>, 
	Saravana Kannan <saravanak@...gle.com>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
	linux-pci@...r.kernel.org, linux-block@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v4 6/6] rust: use strict provenance APIs

On Sun, Mar 16, 2025 at 1:01 AM Boqun Feng <boqun.feng@...il.com> wrote:
>
> On Sat, Mar 15, 2025 at 08:17:30AM -0400, Tamir Duberstein wrote:
> [...]
> > diff --git a/rust/kernel/of.rs b/rust/kernel/of.rs
> > index 40d1bd13682c..f9459694cbdc 100644
> > --- a/rust/kernel/of.rs
> > +++ b/rust/kernel/of.rs
> > @@ -22,7 +22,7 @@ unsafe impl RawDeviceId for DeviceId {
> >      const DRIVER_DATA_OFFSET: usize = core::mem::offset_of!(bindings::of_device_id, data);
> >
> >      fn index(&self) -> usize {
> > -        self.0.data as usize
> > +        crate::expose_provenance(self.0.data)
>
> Even though of_device_id::data was defined as `void *`, but in Rust we
> use it to store index, see kernel::device_id::{IdTable::info(),
> IdArray::new()}. Hence we should use self.0.data.addr() here.

Good point, thanks.