linux-kernel - [PATCH v2 5/7] ubsan: Enable for all*config builds

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Date:   Wed,  2 Dec 2020 16:44:35 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        George Popescu <georgepope@...roid.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        clang-built-linux@...glegroups.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/7] ubsan: Enable for all*config builds

With UBSAN_OBJECT_SIZE disabled for GCC, only UBSAN_ALIGNMENT remained
a noisy UBSAN option. Disable it for COMPILE_TEST so the rest of UBSAN
can be used for full all*config builds or other large combinations.

Link: https://lore.kernel.org/lkml/CAHk-=wgXW=YLxGN0QVpp-1w5GDd2pf1W-FqY15poKzoVfik2qA@mail.gmail.com/
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 lib/Kconfig.ubsan | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 6e8b67d4b0d9..fa78f0f3c1dc 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -130,7 +130,6 @@ config UBSAN_ENUM
 config UBSAN_SANITIZE_ALL
 	bool "Enable instrumentation for the entire kernel"
 	depends on ARCH_HAS_UBSAN_SANITIZE_ALL
-	depends on !COMPILE_TEST
 	default y
 	help
 	  This option activates instrumentation for the entire kernel.
@@ -142,7 +141,7 @@ config UBSAN_SANITIZE_ALL
 config UBSAN_ALIGNMENT
 	bool "Enable checks for pointers alignment"
 	default !HAVE_EFFICIENT_UNALIGNED_ACCESS
-	depends on !UBSAN_TRAP
+	depends on !UBSAN_TRAP && !COMPILE_TEST
 	depends on $(cc-option,-fsanitize=alignment)
 	help
 	  This option enables the check of unaligned memory accesses.
-- 
2.25.1