linux-kernel - Re: [PATCH 1/3] rust: add userspace pointers

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Message-ID: <2024020849-smog-mothball-8723@gregkh>
Date: Thu, 8 Feb 2024 15:59:59 +0000
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Trevor Gross <tmgross@...ch.edu>, 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>,
	Kees Cook <keescook@...omium.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.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>,
	Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
	Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH 1/3] rust: add userspace pointers

On Thu, Feb 08, 2024 at 04:41:52PM +0100, Alice Ryhl wrote:
> On Thu, Feb 8, 2024 at 4:35 PM Greg Kroah-Hartman
> > Along those lines, you all are tieing in the "I want to print a pointer,
> > so hash it properly before I do so" logic from rust like we have in c,
> > right?  Ideally you'd use the same logic if at all possible.
> >
> > If not, that probably needs to be done so that you don't accidentally
> > start leaking things.
> 
> I don't know what the status of this is. For anything I've added, I've
> just made it entirely impossible to print addresses, hashed or not.

Even better, thanks!