linux-kernel - Re: [PATCH 1/2] cfi: add CONFIG_CFI_ICALL_NORMALIZE

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Message-ID: <CAH5fLghz8psC499vVochcW-jC+utDXQonoAvwc-9Na4+31Hdig@mail.gmail.com>
Date: Tue, 30 Jul 2024 11:51:03 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, Sami Tolvanen <samitolvanen@...gle.com>, 
	Peter Zijlstra <peterz@...radead.org>, Miguel Ojeda <ojeda@...nel.org>, Kees Cook <kees@...nel.org>
Cc: 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>, 
	Matthew Maurer <mmaurer@...gle.com>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 1/2] cfi: add CONFIG_CFI_ICALL_NORMALIZE_INTEGERS

On Tue, Jul 30, 2024 at 11:40 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> Introduce a Kconfig option for enabling the experimental option to
> normalize integer types. This ensures that integer types of the same
> size and signedness are considered compatible by the Control Flow
> Integrity sanitizer.
>
> This option exists for compatibility with Rust, as C and Rust do not
> have the same set of integer types. There are cases where C has two
> different integer types of the same size and alignment, but Rust only
> has one integer type of that size and alignment. When Rust calls into
> C functions using such types in their signature, this results in CFI
> failures.

This should say signedness where it says alignment.

Alice