linux-kernel - Re: [PATCH v3] rust: num: bounded: mark _

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: <DEPHSZUPUJBB.2YEABTJ7OR86T@nvidia.com>
Date: Thu, 04 Dec 2025 23:13:18 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Hsiu Che Yu" <yu.whisper.personal@...il.com>, "Alexandre Courbot"
 <acourbot@...dia.com>, "Miguel Ojeda" <ojeda@...nel.org>
Cc: "Yury Norov" <yury.norov@...il.com>, "Boqun Feng"
 <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, "Benno Lossin"
 <lossin@...nel.org>, "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice
 Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>, "Danilo
 Krummrich" <dakr@...nel.org>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] rust: num: bounded: mark __new as unsafe

On Thu Dec 4, 2025 at 12:38 PM JST, Hsiu Che Yu wrote:
> The `Bounded::__new()` constructor relies on the caller to ensure the
> value can be represented within N bits. Failing to uphold this
> requirement breaks the type invariant. Mark it as unsafe and document
> this requirement in a Safety section to make the contract explicit.
>
> Update all call sites to use unsafe blocks and change their comments
> from `INVARIANT:` to `SAFETY:`, as they are now justifying unsafe
> operations rather than establishing type invariants.
>
> Fixes: 01e345e82ec3a ("rust: num: add Bounded integer wrapping type")
> Link: https://lore.kernel.org/all/aS1qC_ol2XEpZ44b@google.com/
> Reported-by: Miguel Ojeda <ojeda@...nel.org>
> Closes: https://github.com/Rust-for-Linux/linux/issues/1211
> Signed-off-by: Hsiu Che Yu <yu.whisper.personal@...il.com>

I believe I gave my acked-by on v2, but just to make sure it isn't
missed:

Acked-by: Alexandre Courbot <acourbot@...dia.com>

Miguel, do you prefer to take this directly, or should I gather all the
`num/*` patches and send you a PR in one go sometime later?