From: Kees Cook <keescook@xxxxxxxxxxxx> Subject: 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. Link: https://lkml.kernel.org/r/20201203004437.389959-4-keescook@xxxxxxxxxxxx Link: https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@xxxxxxxxxxxxxx/ Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx> Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: George Popescu <georgepope@xxxxxxxxxxx> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Cc: Marco Elver <elver@xxxxxxxxxx> Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx> Cc: Michal Marek <michal.lkml@xxxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx> Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/Kconfig.ubsan | 3 +++ 1 file changed, 3 insertions(+) --- a/lib/Kconfig.ubsan~ubsan-disable-object-size-sanitizer-under-gcc +++ a/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@xxxxxxxxxxxxxx/ + depends on !CC_IS_GCC depends on $(cc-option,-fsanitize=object-size) config UBSAN_BOOL _
