linux-kernel - [PATCH 2/4] ubsan: Disable object-size sanitizer under GCC

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Message-Id: <20201002221527.177500-3-keescook@chromium.org>
Date:   Fri,  2 Oct 2020 15:15:25 -0700
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 2/4] ubsan: Disable object-size sanitizer under GCC

GCC's -fsanitize=object-size (as part of CONFIG_UBSAN_MISC) greatly
increases stack utilization. Do not allow this under GCC.

Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Link: https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@mail.gmail.com/
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 lib/Kconfig.ubsan | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index c0b801871e0b..aeb2cdea0b94 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -104,6 +104,9 @@ config UBSAN_UNSIGNED_OVERFLOW
 
 config UBSAN_OBJECT_SIZE
 	def_bool UBSAN_MISC
+	# gcc hugely expands stack usage with -fsanitize=object-size
+	# https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@mail.gmail.com/
+	depends on !CC_IS_GCC
 	depends on $(cc-option,-fsanitize=object-size)
 
 config UBSAN_BOOL
-- 
2.25.1