The patch titled
Subject: ubsan: disable object-size sanitizer under GCC
has been added to the -mm tree. Its filename is
ubsan-disable-object-size-sanitizer-under-gcc.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/ubsan-disable-object-size-sanitizer-under-gcc.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/ubsan-disable-object-size-sanitizer-under-gcc.patch
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------------------------------------------------------
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
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
ubsan-remove-redundant-wno-maybe-uninitialized.patch
ubsan-move-cc-option-tests-into-kconfig.patch
ubsan-disable-object-size-sanitizer-under-gcc.patch
ubsan-disable-ubsan_trap-for-allconfig.patch
ubsan-enable-for-allconfig-builds.patch
ubsan-remove-ubsan_misc-in-favor-of-individual-options.patch
ubsan-expand-tests-and-reporting.patch
