linux-kernel - [PATCH v2 1/7] ubsan: Remove redundant -Wno-maybe-uninitialized

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Date:   Wed,  2 Dec 2020 16:44:31 -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 1/7] ubsan: Remove redundant -Wno-maybe-uninitialized

In commit 78a5255ffb6a ("Stop the ad-hoc games with -Wno-maybe-initialized")
-Wmaybe-uninitialized was disabled globally, so keeping the disabling logic
here too doesn't make sense.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 lib/Kconfig.ubsan      | 4 ----
 scripts/Makefile.ubsan | 4 ----
 2 files changed, 8 deletions(-)

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 58f8d03d037b..d8d4d6557b80 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -72,10 +72,6 @@ config UBSAN_MISC
 config UBSAN_SANITIZE_ALL
 	bool "Enable instrumentation for the entire kernel"
 	depends on ARCH_HAS_UBSAN_SANITIZE_ALL
-
-	# We build with -Wno-maybe-uninitilzed, but we still want to
-	# use -Wmaybe-uninitilized in allmodconfig builds.
-	# So dependsy bellow used to disable this option in allmodconfig
 	depends on !COMPILE_TEST
 	default y
 	help
diff --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan
index 9716dab06bc7..c18fecc53605 100644
--- a/scripts/Makefile.ubsan
+++ b/scripts/Makefile.ubsan
@@ -31,7 +31,3 @@ endif
 ifdef CONFIG_UBSAN_TRAP
       CFLAGS_UBSAN += $(call cc-option, -fsanitize-undefined-trap-on-error)
 endif
-
-      # -fsanitize=* options makes GCC less smart than usual and
-      # increase number of 'maybe-uninitialized false-positives
-      CFLAGS_UBSAN += $(call cc-option, -Wno-maybe-uninitialized)
-- 
2.25.1