linux-kernel - [PATCH] rust: Ignore preserve-most functions

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Date:   Tue, 31 Oct 2023 20:19:44 +0000
From:   Matthew Maurer <mmaurer@...gle.com>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Matthew Maurer <mmaurer@...gle.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>,
        Alice Ryhl <aliceryhl@...gle.com>, Tom Rix <trix@...hat.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH] rust: Ignore preserve-most functions

Neither bindgen nor Rust know about the preserve-most calling
convention, and Clang describes it as unstable. Since we aren't using
functions with this calling convention from Rust, blocklist them.

These functions are only added to the build when list hardening is
enabled, which is likely why others didn't notice this yet.

Signed-off-by: Matthew Maurer <mmaurer@...gle.com>
---
 rust/bindgen_parameters | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rust/bindgen_parameters b/rust/bindgen_parameters
index 552d9a85925b..8d9f82d350b8 100644
--- a/rust/bindgen_parameters
+++ b/rust/bindgen_parameters
@@ -20,3 +20,7 @@
 
 # `seccomp`'s comment gets understood as a doctest
 --no-doc-comments
+
+# These functions use the __preserve_most calling convention, which neither bindgen
+# nor Rust currently understand, and which Clang currently declares to be unstable.
+--blocklist-function __list_.*_report
-- 
2.42.0.820.g83a721a137-goog