On Fri, Oct 02, 2020 at 03:15:25PM -0700, Kees Cook wrote: > 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@xxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> > Link: https://lore.kernel.org/lkml/CAHk-=wjPasyJrDuwDnpHJS2TuQfExwe=px-SzLeN8GFMAQJPmQ@xxxxxxxxxxxxxx/ Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx> > --- > 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@xxxxxxxxxxxxxx/ > + depends on !CC_IS_GCC > depends on $(cc-option,-fsanitize=object-size) > > config UBSAN_BOOL > -- > 2.25.1
