linux-kernel - Re: [PATCH 1/4] rust: types: add `ForeignOwnable::PointedTo`

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87bjvgp3i0.fsf@kloenk.dev>
Date: Wed, 05 Feb 2025 20:59:03 +0100
From: Fiona Behrens <me@...enk.dev>
To: Andreas Hindborg <a.hindborg@...nel.org>
Cc: Danilo Krummrich <dakr@...nel.org>,  Miguel Ojeda <ojeda@...nel.org>,
  Alex Gaynor <alex.gaynor@...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>,  Alice Ryhl
 <aliceryhl@...gle.com>,  Trevor Gross <tmgross@...ch.edu>,  Joel Becker
 <jlbec@...lplan.org>,  Christoph Hellwig <hch@....de>,
  rust-for-linux@...r.kernel.org,  linux-kernel@...r.kernel.org,  Tamir
 Duberstein <tamird@...il.com>
Subject: Re: [PATCH 1/4] rust: types: add `ForeignOwnable::PointedTo`

Andreas Hindborg <a.hindborg@...nel.org> writes:

> From: Tamir Duberstein <tamird@...il.com>
>
> Allow implementors to specify the foreign pointer type; this exposes
> information about the pointed-to type such as its alignment.
>
> This requires the trait to be `unsafe` since it is now possible for
> implementors to break soundness by returning a misaligned pointer.
>
> Encoding the pointer type in the trait (and avoiding pointer casts)
> allows the compiler to check that implementors return the correct
> pointer type. This is preferable to directly encoding the alignment in
> the trait using a constant as the compiler would be unable to check it.
>
> Reviewed-by: Andreas Hindborg <a.hindborg@...nel.org>
> Signed-off-by: Tamir Duberstein <tamird@...il.com>
> Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
>

Reviewed-by: Fiona Behrens <me@...enk.dev>