4.16-stable review patch. If anyone has any objections, please let me know.
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From: Masahiro Yamada yamada.masahiro@socionext.com
[ Upstream commit 642ef99be932c4071274b28eaf3d3d85bbb6e78c ]
Since commit d677a4d60193 ("Makefile: support flag -fsanitizer-coverage=trace-cmp"), you miss to build the SANCOV plugin under some circumstances.
CONFIG_KCOV=y CONFIG_KCOV_ENABLE_COMPARISONS=y Your compiler does not support -fsanitize-coverage=trace-pc Your compiler does not support -fsanitize-coverage=trace-cmp
Under this condition, $(CFLAGS_KCOV) is not empty but contains a space, so the following ifeq-conditional is false.
ifeq ($(CFLAGS_KCOV),)
Then, scripts/Makefile.gcc-plugins misses to add sancov_plugin.so to gcc-plugin-y while the SANCOV plugin is necessary as an alternative means.
Fixes: d677a4d60193 ("Makefile: support flag -fsanitizer-coverage=trace-cmp") Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com Acked-by: Kees Cook keescook@chromium.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- scripts/Makefile.gcc-plugins | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/scripts/Makefile.gcc-plugins +++ b/scripts/Makefile.gcc-plugins @@ -14,7 +14,7 @@ ifdef CONFIG_GCC_PLUGINS endif
ifdef CONFIG_GCC_PLUGIN_SANCOV - ifeq ($(CFLAGS_KCOV),) + ifeq ($(strip $(CFLAGS_KCOV)),) # It is needed because of the gcc-plugin.sh and gcc version checks. gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so