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authorGustavo A. R. Silva <gustavoars@kernel.org>2023-11-30 23:29:34 +0300
committerGustavo A. R. Silva <gustavoars@kernel.org>2024-01-22 02:45:31 +0300
commita5e0ace04fbf56c1794b1a2fa7a93672753b3fc7 (patch)
tree7bbc93e0a1fa41f979e198e14e02a45d7bcb9063 /Makefile
parent113a61863ecbfb3c29f3eb18fd9813bccf1743c1 (diff)
downloadlinux-a5e0ace04fbf56c1794b1a2fa7a93672753b3fc7.tar.xz
init: Kconfig: Disable -Wstringop-overflow for GCC-11
-Wstringop-overflow is buggy in GCC-11. Therefore, we should disable this option specifically for that compiler version. To achieve this, we introduce a new configuration option: GCC11_NO_STRINGOP_OVERFLOW. The compiler option related to string operation overflow is now managed under configuration CC_STRINGOP_OVERFLOW. This option is enabled by default for all other versions of GCC that support it. Link: https://lore.kernel.org/lkml/b3c99290-40bc-426f-b3d2-1aa903f95c4e@embeddedor.com/ Link: https://lore.kernel.org/lkml/20231128091351.2bfb38dd@canb.auug.org.au/ Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/linux-hardening/ZWj1+jkweEDWbmAR@work/ Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile4
1 files changed, 3 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index c01cbbb208ca..9f9b76d3a4b7 100644
--- a/Makefile
+++ b/Makefile
@@ -986,7 +986,9 @@ NOSTDINC_FLAGS += -nostdinc
# perform bounds checking.
KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
-KBUILD_CFLAGS += $(call cc-option, -Wstringop-overflow)
+#Currently, disable -Wstringop-overflow for GCC 11, globally.
+KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
+KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += -fno-strict-overflow