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[v2,3/7] ubsan: Disable object-size sanitizer under GCC

Message ID 20201203004437.389959-4-keescook@chromium.org (mailing list archive)
State New, archived
Headers show
Series Clean up UBSAN Makefile | expand

Commit Message

Kees Cook Dec. 3, 2020, 12:44 a.m. UTC 
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@linux-foundation.org>
Link: https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@mail.gmail.com/
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 lib/Kconfig.ubsan | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 05147112b355..4190a99b1eaa 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -113,6 +113,9 @@  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