Messages in this thread | | | From | Arnd Bergmann <> | Date | Thu, 7 Jan 2021 00:40:23 +0100 | Subject | Re: [PATCH] ubsan: disable unsigned-integer-overflow sanitizer with clang |
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On Thu, Jan 7, 2021 at 12:17 AM Kees Cook <keescook@chromium.org> wrote: > > On Wed, Jan 06, 2021 at 11:12:18PM +0100, Arnd Bergmann wrote: > > On Wed, Jan 6, 2021 at 10:57 PM Kees Cook <keescook@chromium.org> wrote: > > > On Wed, Dec 30, 2020 at 04:47:35PM +0100, Arnd Bergmann wrote: > > > > diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan > > > > index 8b635fd75fe4..e23873282ba7 100644 > > > > --- a/lib/Kconfig.ubsan > > > > +++ b/lib/Kconfig.ubsan > > > > @@ -122,6 +122,8 @@ config UBSAN_SIGNED_OVERFLOW > > > > > > > > config UBSAN_UNSIGNED_OVERFLOW > > > > bool "Perform checking for unsigned arithmetic overflow" > > > > + # clang hugely expands stack usage with -fsanitize=object-size > > > > + depends on !CC_IS_CLANG > > > > depends on $(cc-option,-fsanitize=unsigned-integer-overflow) > > > > > > Because of Clang implementation issues (see commit c637693b20da), this is > > > already "default n" (and not supported under GCC at all). IIUC, setting > > > this to "depends on !COMPILE_TEST" won't work for randconfigs, yes? > > > > Ah, I had not realized this is clang specific. Adding the !COMPILE_TEST > > dependency would hide it for me, which may be good enough for me. > > I thought COMPILE_TEST does not get set for randconfig?
It does on my kernel, though I never submitted that patch ;-)
Arnd
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