From: Gustavo A. R. Silva Date: Wed, 29 Sep 2021 21:18:03 +0000 (-0500) Subject: Makefile: Enable -Wcast-function-type X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=552a23a0e5d0a84cecd4687043d8030673981d30;p=linux.git Makefile: Enable -Wcast-function-type In order to make sure new function cast mismatches are not introduced in the kernel (to avoid tripping CFI checking), the kernel should be globally built with -Wcast-function-type. Link: https://github.com/KSPP/linux/issues/20 Co-developed-by: Kees Cook Signed-off-by: Kees Cook Signed-off-by: Gustavo A. R. Silva --- diff --git a/Makefile b/Makefile index 9e12c14ea0fbb..5a8cde6a2fbb4 100644 --- a/Makefile +++ b/Makefile @@ -953,6 +953,11 @@ KBUILD_CFLAGS += -Wvla # disable pointer signed / unsigned warnings in gcc 4.0 KBUILD_CFLAGS += -Wno-pointer-sign +# In order to make sure new function cast mismatches are not introduced +# in the kernel (to avoid tripping CFI checking), the kernel should be +# globally built with -Wcast-function-type. +KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) + # disable stringop warnings in gcc 8+ KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)