rust: kasan: KASAN+RUST requires clang

Kernel KASAN involves passing various llvm/gcc specific arguments to
the C and Rust compiler. Since these arguments differ between llvm and
gcc, it's not safe to mix an llvm-based rustc with a gcc build when
kasan is enabled.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Cc: stable@vger.kernel.org
Fixes: e3117404b411 ("kbuild: rust: Enable KASAN support")
Link: https://patch.msgid.link/20260408-kasan-rust-sw-tags-v3-1-e07964d14363@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

diff --git a/init/Kconfig b/init/Kconfig
index 2937c4d308aecb993e8bd347b089d1f4fab459e6..826a7d768ca368dcedfc32a8e7e5fc1a7693fefd 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2198,6 +2198,7 @@ config RUST
        depends on !DEBUG_INFO_BTF || (PAHOLE_HAS_LANG_EXCLUDE && !LTO)
        depends on !CFI || HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC
        select CFI_ICALL_NORMALIZE_INTEGERS if CFI
+       depends on !KASAN || CC_IS_CLANG
        depends on !KASAN_SW_TAGS
        help
          Enables Rust support in the kernel.