Add sancov plugin

The sancov gcc plugin inserts a __sanitizer_cov_trace_pc() call
at the start of basic blocks.

This plugin is a helper plugin for the kcov feature. It supports
all gcc versions with plugin support (from gcc-4.5 on).
It is based on the gcc commit "Add fuzzing coverage support" by Dmitry Vyukov
(https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296).

Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 04ca45262ad1..05f1e95b796d 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -384,6 +384,15 @@ config GCC_PLUGIN_CYC_COMPLEXITY
           N = the number of nodes
           P = the number of connected components (exit nodes).
 
+config GCC_PLUGIN_SANCOV
+        bool
+        depends on GCC_PLUGINS
+        help
+          This plugin inserts a __sanitizer_cov_trace_pc() call at the start of
+          basic blocks. It supports all gcc versions with plugin support (from
+          gcc-4.5 on). It is based on the commit "Add fuzzing coverage support"
+          by Dmitry Vyukov <dvyukov@google.com>.
+
 config HAVE_CC_STACKPROTECTOR
         bool
         help