[PATCH v3] rust: make mutually exclusive with CFI_CLANG

From: Conor Dooley <conor@kernel.org>
To: linux-riscv@lists.infradead.org
Cc: conor@kernel.org, Conor Dooley <conor.dooley@microchip.com>,
	stable@vger.kernel.org, Miguel Ojeda <ojeda@kernel.org>,
	Alex Gaynor <alex.gaynor@gmail.com>,
	Wedson Almeida Filho <wedsonaf@gmail.com>,
	linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
	Sami Tolvanen <samitolvanen@google.com>,
	Kees Cook <keescook@chromium.org>,
	Nathan Chancellor <nathan@kernel.org>,
	llvm@lists.linux.dev
Subject: [PATCH v3] rust: make mutually exclusive with CFI_CLANG
Date: Thu,  4 Apr 2024 15:17:02 +0100	[thread overview]
Message-ID: <20240404-providing-emporium-e652e359c711@spud> (raw)

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

On RISC-V and arm64, and presumably x86, 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@vger.kernel.org
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
Sending this one on its own, there's no explicit dep on this for the
riscv enabling patch, v3 to continue the numbering from there. Nothing
has changed since v2.

CC: Miguel Ojeda <ojeda@kernel.org>
CC: Alex Gaynor <alex.gaynor@gmail.com>
CC: Wedson Almeida Filho <wedsonaf@gmail.com>
CC: linux-kernel@vger.kernel.org (open list)
CC: rust-for-linux@vger.kernel.org
CC: Sami Tolvanen <samitolvanen@google.com>
CC: Kees Cook <keescook@chromium.org>
CC: Nathan Chancellor <nathan@kernel.org>
CC: llvm@lists.linux.dev
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index aa02aec6aa7d..ad9a2da27dc9 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1899,6 +1899,7 @@ 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

