linux-hardening - [PATCH] ubsan: Restore dependency on ARCH_HAS

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Date: Tue, 14 May 2024 16:37:48 -0700
From: Kees Cook <keescook@...omium.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
	Marco Elver <elver@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	kasan-dev@...glegroups.com,
	linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ubsan: Restore dependency on ARCH_HAS_UBSAN

While removing CONFIG_UBSAN_SANITIZE_ALL, ARCH_HAS_UBSAN wasn't correctly
depended on. Restore this, as we do not want to attempt UBSAN builds
unless it's actually been tested on a given architecture.

Reported-by: Masahiro Yamada <masahiroy@...nel.org>
Closes: https://lore.kernel.org/all/20240514095427.541201-1-masahiroy@kernel.org
Fixes: 918327e9b7ff ("ubsan: Remove CONFIG_UBSAN_SANITIZE_ALL")
Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: Marco Elver <elver@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>
Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc: kasan-dev@...glegroups.com
Cc: linux-hardening@...r.kernel.org
---
 lib/Kconfig.ubsan | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index e81e1ac4a919..bdda600f8dfb 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -4,6 +4,7 @@ config ARCH_HAS_UBSAN
 
 menuconfig UBSAN
 	bool "Undefined behaviour sanity checker"
+	depends on ARCH_HAS_UBSAN
 	help
 	  This option enables the Undefined Behaviour sanity checker.
 	  Compile-time instrumentation is used to detect various undefined
-- 
2.34.1