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>

7 files changed, 184 insertions, 10 deletions

diff --git a/Makefile b/Makefile
index 20fcf4b26fbc..c3d494ba3ae1 100644
--- a/Makefile
+++ b/Makefile
@@ -369,7 +369,7 @@ LDFLAGS_MODULE  =
 CFLAGS_KERNEL   =
 AFLAGS_KERNEL   =
 CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
-CFLAGS_KCOV     = -fsanitize-coverage=trace-pc
+CFLAGS_KCOV     := $(call cc-option,-fsanitize-coverage=trace-pc,)
 
 
 # Use USERINCLUDE when you must reference the UAPI directories only.
@@ -691,14 +691,6 @@ endif
 endif
 KBUILD_CFLAGS += $(stackp-flag)
 
-ifdef CONFIG_KCOV
-  ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
-    $(warning Cannot use CONFIG_KCOV: \
-             -fsanitize-coverage=trace-pc is not supported by compiler)
-    CFLAGS_KCOV =
-  endif
-endif
-
 ifeq ($(cc-name),clang)
 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
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
diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 12734a96df47..ac58c1616408 100644
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -8,6 +8,8 @@ PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
 LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined -nostdlib -z nodefaultlib
 targets += purgatory.ro
 
+KCOV_INSTRUMENT := n
+
 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
 # sure how to relocate those. Like kexec-tools, use custom flags.
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 77d7d034bac3..b7827dca3fec 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -708,6 +708,8 @@ config KCOV
         bool "Code coverage for fuzzing"
         depends on ARCH_HAS_KCOV
         select DEBUG_FS
+        select GCC_PLUGINS
+        select GCC_PLUGIN_SANCOV
         help
           KCOV exposes kernel code coverage information in a form suitable
           for coverage-guided fuzzing (randomized testing).
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index b4a189c95a8a..5e22b60589c1 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -2,10 +2,26 @@ ifdef CONFIG_GCC_PLUGINS
   __PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
   PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
 
+  SANCOV_PLUGIN := -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so
+
   gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY)        += cyc_complexity_plugin.so
+
+  ifdef CONFIG_GCC_PLUGIN_SANCOV
+    ifeq ($(CFLAGS_KCOV),)
+      # It is needed because of the gcc-plugin.sh and gcc version checks.
+      gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV)           += sancov_plugin.so
+
+      ifneq ($(PLUGINCC),)
+        CFLAGS_KCOV := $(SANCOV_PLUGIN)
+      else
+        $(warning warning: cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler)
+      endif
+    endif
+  endif
+
   GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y))
 
-  export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN
+  export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN SANCOV_PLUGIN
 
   ifeq ($(PLUGINCC),)
     ifneq ($(GCC_PLUGINS_CFLAGS),)
@@ -16,6 +32,9 @@ ifdef CONFIG_GCC_PLUGINS
         $(warning warning: your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least)
       endif
     endif
+  else
+    # SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication.
+    GCC_PLUGINS_CFLAGS := $(filter-out $(SANCOV_PLUGIN), $(GCC_PLUGINS_CFLAGS))
   endif
 
   KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
index c60ba4bef57c..88c8ec47232b 100644
--- a/scripts/gcc-plugins/Makefile
+++ b/scripts/gcc-plugins/Makefile
@@ -14,8 +14,14 @@ endif
 
 export GCCPLUGINS_DIR HOSTLIBS
 
+ifneq ($(CFLAGS_KCOV), $(SANCOV_PLUGIN))
+  GCC_PLUGIN := $(filter-out $(SANCOV_PLUGIN), $(GCC_PLUGIN))
+endif
+
 $(HOSTLIBS)-y := $(GCC_PLUGIN)
 always := $($(HOSTLIBS)-y)
 
 cyc_complexity_plugin-objs := cyc_complexity_plugin.o
+sancov_plugin-objs := sancov_plugin.o
+
 clean-files += *.so
diff --git a/scripts/gcc-plugins/sancov_plugin.c b/scripts/gcc-plugins/sancov_plugin.c
new file mode 100644
index 000000000000..aedd6113cb73
--- /dev/null
+++ b/scripts/gcc-plugins/sancov_plugin.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2011-2016 by Emese Revfy <re.emese@gmail.com>
+ * Licensed under the GPL v2, or (at your option) v3
+ *
+ * Homepage:
+ * https://github.com/ephox-gcc-plugins/sancov
+ *
+ * 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>.
+ *
+ * You can read about it more here:
+ *  https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296
+ *  http://lwn.net/Articles/674854/
+ *  https://github.com/google/syzkaller
+ *  https://lwn.net/Articles/677764/
+ *
+ * Usage:
+ * make run
+ */
+
+#include "gcc-common.h"
+
+int plugin_is_GPL_compatible;
+
+tree sancov_fndecl;
+
+static struct plugin_info sancov_plugin_info = {
+        .version        = "20160402",
+        .help           = "sancov plugin\n",
+};
+
+static unsigned int sancov_execute(void)
+{
+        basic_block bb;
+
+        /* Remove this line when this plugin and kcov will be in the kernel.
+        if (!strcmp(DECL_NAME_POINTER(current_function_decl), DECL_NAME_POINTER(sancov_fndecl)))
+                return 0;
+        */
+
+        FOR_EACH_BB_FN(bb, cfun) {
+                const_gimple stmt;
+                gcall *gcall;
+                gimple_stmt_iterator gsi = gsi_after_labels(bb);
+
+                if (gsi_end_p(gsi))
+                        continue;
+
+                stmt = gsi_stmt(gsi);
+                gcall = as_a_gcall(gimple_build_call(sancov_fndecl, 0));
+                gimple_set_location(gcall, gimple_location(stmt));
+                gsi_insert_before(&gsi, gcall, GSI_SAME_STMT);
+        }
+        return 0;
+}
+
+#define PASS_NAME sancov
+
+#define NO_GATE
+#define TODO_FLAGS_FINISH TODO_dump_func | TODO_verify_stmts | TODO_update_ssa_no_phi | TODO_verify_flow
+
+#include "gcc-generate-gimple-pass.h"
+
+static void sancov_start_unit(void __unused *gcc_data, void __unused *user_data)
+{
+        tree leaf_attr, nothrow_attr;
+        tree BT_FN_VOID = build_function_type_list(void_type_node, NULL_TREE);
+
+        sancov_fndecl = build_fn_decl("__sanitizer_cov_trace_pc", BT_FN_VOID);
+
+        DECL_ASSEMBLER_NAME(sancov_fndecl);
+        TREE_PUBLIC(sancov_fndecl) = 1;
+        DECL_EXTERNAL(sancov_fndecl) = 1;
+        DECL_ARTIFICIAL(sancov_fndecl) = 1;
+        DECL_PRESERVE_P(sancov_fndecl) = 1;
+        DECL_UNINLINABLE(sancov_fndecl) = 1;
+        TREE_USED(sancov_fndecl) = 1;
+
+        nothrow_attr = tree_cons(get_identifier("nothrow"), NULL, NULL);
+        decl_attributes(&sancov_fndecl, nothrow_attr, 0);
+        gcc_assert(TREE_NOTHROW(sancov_fndecl));
+#if BUILDING_GCC_VERSION > 4005
+        leaf_attr = tree_cons(get_identifier("leaf"), NULL, NULL);
+        decl_attributes(&sancov_fndecl, leaf_attr, 0);
+#endif
+}
+
+int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
+{
+        int i;
+        struct register_pass_info sancov_plugin_pass_info;
+        const char * const plugin_name = plugin_info->base_name;
+        const int argc = plugin_info->argc;
+        const struct plugin_argument * const argv = plugin_info->argv;
+        bool enable = true;
+
+        static const struct ggc_root_tab gt_ggc_r_gt_sancov[] = {
+                {
+                        .base = &sancov_fndecl,
+                        .nelt = 1,
+                        .stride = sizeof(sancov_fndecl),
+                        .cb = &gt_ggc_mx_tree_node,
+                        .pchw = &gt_pch_nx_tree_node
+                },
+                LAST_GGC_ROOT_TAB
+        };
+
+        /* BBs can be split afterwards?? */
+        sancov_plugin_pass_info.pass                            = make_sancov_pass();
+#if BUILDING_GCC_VERSION >= 4009
+        sancov_plugin_pass_info.reference_pass_name             = "asan";
+#else
+        sancov_plugin_pass_info.reference_pass_name             = "nrv";
+#endif
+        sancov_plugin_pass_info.ref_pass_instance_number        = 0;
+        sancov_plugin_pass_info.pos_op                          = PASS_POS_INSERT_BEFORE;
+
+        if (!plugin_default_version_check(version, &gcc_version)) {
+                error(G_("incompatible gcc/plugin versions"));
+                return 1;
+        }
+
+        for (i = 0; i < argc; ++i) {
+                if (!strcmp(argv[i].key, "no-sancov")) {
+                        enable = false;
+                        continue;
+                }
+                error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
+        }
+
+        register_callback(plugin_name, PLUGIN_INFO, NULL, &sancov_plugin_info);
+
+        if (!enable)
+                return 0;
+
+#if BUILDING_GCC_VERSION < 6000
+        register_callback(plugin_name, PLUGIN_START_UNIT, &sancov_start_unit, NULL);
+        register_callback(plugin_name, PLUGIN_REGISTER_GGC_ROOTS, NULL, (void *)&gt_ggc_r_gt_sancov);
+        register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &sancov_plugin_pass_info);
+#endif
+
+        return 0;
+}