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| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2023-11-30 14:29:34 -0600 |
|---|---|---|
| committer | Gustavo A. R. Silva <gustavoars@kernel.org> | 2024-01-21 17:45:31 -0600 |
| commit | a5e0ace04fbf56c1794b1a2fa7a93672753b3fc7 (patch) | |
| tree | 7bbc93e0a1fa41f979e198e14e02a45d7bcb9063 /Makefile | |
| parent | 113a61863ecbfb3c29f3eb18fd9813bccf1743c1 (diff) | |
| download | lwn-a5e0ace04fbf56c1794b1a2fa7a93672753b3fc7.tar.gz lwn-a5e0ace04fbf56c1794b1a2fa7a93672753b3fc7.zip | |
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-- | Makefile | 4 |
1 files changed, 3 insertions, 1 deletions
@@ -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 |