linux-kernel - [PATCH v2 1/3] rust: make mutually exclusive with CFI

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Date: Fri, 23 Feb 2024 13:38:03 +0000
From: Conor Dooley <conor@...nel.org>
To: linux-riscv@...ts.infradead.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	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>,
	Jonathan Corbet <corbet@....net>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Tom Rix <trix@...hat.com>,
	rust-for-linux@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	stable@...r.kernel.org
Subject: [PATCH v2 1/3] rust: make mutually exclusive with CFI_CLANG

From: Conor Dooley <conor.dooley@...rochip.com>

On RISC-V, and presumably x86/arm64, if CFI_CLANG is enabled loading a
rust module will trigger a kernel panic. Support for sanitisers,
including kcfi (CFI_CLANG), is in the works, but for now they're
nightly-only options in rustc. Make RUST depend on !CFI_CLANG to prevent
configuring a kernel without symmetrical support for kfi.

Fixes: 2f7ab1267dc9 ("Kbuild: add Rust support")
cc: stable@...r.kernel.org
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
This probably needs to go to stable. The correct fixes tag for that I am
not sure of however, but since CFI_CLANG predates RUST, I blamed the
commit adding rust support.
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index 8d4e836e1b6b..6cf05824859e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1895,6 +1895,7 @@ config RUST
 	bool "Rust support"
 	depends on HAVE_RUST
 	depends on RUST_IS_AVAILABLE
+	depends on !CFI_CLANG
 	depends on !MODVERSIONS
 	depends on !GCC_PLUGINS
 	depends on !RANDSTRUCT
-- 
2.43.0