- For the randstruct plugin, enable automatic randomization of structures

that are entirely function pointers (along with a couple designated
   initializer fixes).
 - For the structleak plugin, provide an option to perform zeroing
   initialization of all otherwise uninitialized stack variables that are
   passed by reference (Ard Biesheuvel).
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 Comment: Kees Cook <kees@outflux.net>
 
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 QTTx+qrdpuhEJ+mH10JpOJnFctVI3vt7tUXGhBb0eBXuvnXPACjy3jx2X1tcnKf4
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 -----END PGP SIGNATURE-----

Merge tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull gcc plugins update from Kees Cook:
 "This finishes the porting work on randstruct, and introduces a new
  option to structleak, both noted below:

   - For the randstruct plugin, enable automatic randomization of
     structures that are entirely function pointers (along with a couple
     designated initializer fixes).

   - For the structleak plugin, provide an option to perform zeroing
     initialization of all otherwise uninitialized stack variables that
     are passed by reference (Ard Biesheuvel)"

* tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  gcc-plugins: structleak: add option to init all vars used as byref args
  randstruct: Enable function pointer struct detection
  drivers/net/wan/z85230.c: Use designated initializers
  drm/amd/powerplay: rv: Use designated initializers

arch/Kconfig

@@ -458,6 +458,13 @@ config GCC_PLUGIN_STRUCTLEAK
 	   * https://grsecurity.net/
 	   * https://pax.grsecurity.net/
 
+config GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
+	bool "Force initialize all struct type variables passed by reference"
+	depends on GCC_PLUGIN_STRUCTLEAK
+	help
+	  Zero initialize any struct type local variable that may be passed by
+	  reference without having been initialized.
+
 config GCC_PLUGIN_STRUCTLEAK_VERBOSE
 	bool "Report forcefully initialized variables"
 	depends on GCC_PLUGIN_STRUCTLEAK
@@ -473,11 +480,13 @@ config GCC_PLUGIN_RANDSTRUCT
 	depends on GCC_PLUGINS
 	select MODVERSIONS if MODULES
 	help
-	  If you say Y here, the layouts of structures explicitly
-	  marked by __randomize_layout will be randomized at
-	  compile-time.  This can introduce the requirement of an
-	  additional information exposure vulnerability for exploits
-	  targeting these structure types.
+	  If you say Y here, the layouts of structures that are entirely
+	  function pointers (and have not been manually annotated with
+	  __no_randomize_layout), or structures that have been explicitly
+	  marked with __randomize_layout, will be randomized at compile-time.
+	  This can introduce the requirement of an additional information
+	  exposure vulnerability for exploits targeting these structure
+	  types.
 
 	  Enabling this feature will introduce some performance impact,
 	  slightly increase memory usage, and prevent the use of forensic

drivers/gpu/drm/amd/powerplay/hwmgr/rv_hwmgr.c

@@ -317,8 +317,8 @@ static int rv_tf_set_num_active_display(struct pp_hwmgr *hwmgr, void *input,
 }
 
 static const struct phm_master_table_item rv_set_power_state_list[] = {
-	{ NULL, rv_tf_set_clock_limit },
-	{ NULL, rv_tf_set_num_active_display },
+	{ .tableFunction = rv_tf_set_clock_limit },
+	{ .tableFunction = rv_tf_set_num_active_display },
 	{ }
 };
 
@@ -391,7 +391,7 @@ static int rv_tf_disable_gfx_off(struct pp_hwmgr *hwmgr,
 }
 
 static const struct phm_master_table_item rv_disable_dpm_list[] = {
-	{NULL, rv_tf_disable_gfx_off},
+	{ .tableFunction = rv_tf_disable_gfx_off },
 	{ },
 };
 
@@ -416,7 +416,7 @@ static int rv_tf_enable_gfx_off(struct pp_hwmgr *hwmgr,
 }
 
 static const struct phm_master_table_item rv_enable_dpm_list[] = {
-	{NULL, rv_tf_enable_gfx_off},
+	{ .tableFunction = rv_tf_enable_gfx_off },
 	{ },
 };
 

drivers/net/wan/z85230.c

@@ -483,11 +483,10 @@ static void z8530_status(struct z8530_channel *chan)
 	write_zsctrl(chan, RES_H_IUS);
 }
 
-struct z8530_irqhandler z8530_sync =
-{
-	z8530_rx,
-	z8530_tx,
-	z8530_status
+struct z8530_irqhandler z8530_sync = {
+	.rx = z8530_rx,
+	.tx = z8530_tx,
+	.status = z8530_status,
 };
 
 EXPORT_SYMBOL(z8530_sync);
@@ -605,15 +604,15 @@ static void z8530_dma_status(struct z8530_channel *chan)
 }
 
 static struct z8530_irqhandler z8530_dma_sync = {
-	z8530_dma_rx,
-	z8530_dma_tx,
-	z8530_dma_status
+	.rx = z8530_dma_rx,
+	.tx = z8530_dma_tx,
+	.status = z8530_dma_status,
 };
 
 static struct z8530_irqhandler z8530_txdma_sync = {
-	z8530_rx,
-	z8530_dma_tx,
-	z8530_dma_status
+	.rx = z8530_rx,
+	.tx = z8530_dma_tx,
+	.status = z8530_dma_status,
 };
 
 /**
@@ -678,11 +677,10 @@ static void z8530_status_clear(struct z8530_channel *chan)
 	write_zsctrl(chan, RES_H_IUS);
 }
 
-struct z8530_irqhandler z8530_nop=
-{
-	z8530_rx_clear,
-	z8530_tx_clear,
-	z8530_status_clear
+struct z8530_irqhandler z8530_nop = {
+	.rx = z8530_rx_clear,
+	.tx = z8530_tx_clear,
+	.status = z8530_status_clear,
 };
 
 

scripts/Makefile.gcc-plugins

@@ -27,6 +27,7 @@ ifdef CONFIG_GCC_PLUGINS
 
   gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK)	+= structleak_plugin.so
   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE)	+= -fplugin-arg-structleak_plugin-verbose
+  gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)	+= -fplugin-arg-structleak_plugin-byref-all
   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK)	+= -DSTRUCTLEAK_PLUGIN
 
   gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT)	+= randomize_layout_plugin.so

scripts/gcc-plugins/randomize_layout_plugin.c

@@ -436,9 +436,6 @@ static int is_pure_ops_struct(const_tree node)
 
 	gcc_assert(TREE_CODE(node) == RECORD_TYPE || TREE_CODE(node) == UNION_TYPE);
 
-	/* XXX: Do not apply randomization to all-ftpr structs yet. */
-	return 0;
-
 	for (field = TYPE_FIELDS(node); field; field = TREE_CHAIN(field)) {
 		const_tree fieldtype = get_field_type(field);
 		enum tree_code code = TREE_CODE(fieldtype);

scripts/gcc-plugins/structleak_plugin.c

@@ -16,6 +16,7 @@
  * Options:
  * -fplugin-arg-structleak_plugin-disable
  * -fplugin-arg-structleak_plugin-verbose
+ * -fplugin-arg-structleak_plugin-byref-all
  *
  * Usage:
  * $ # for 4.5/4.6/C based 4.7
@@ -42,6 +43,7 @@ static struct plugin_info structleak_plugin_info = {
 };
 
 static bool verbose;
+static bool byref_all;
 
 static tree handle_user_attribute(tree *node, tree name, tree args, int flags, bool *no_add_attrs)
 {
@@ -150,7 +152,9 @@ static void initialize(tree var)
 	/* these aren't the 0days you're looking for */
 	if (verbose)
 		inform(DECL_SOURCE_LOCATION(var),
-			"userspace variable will be forcibly initialized");
+			"%s variable will be forcibly initialized",
+			(byref_all && TREE_ADDRESSABLE(var)) ? "byref"
+							     : "userspace");
 
 	/* build the initializer expression */
 	initializer = build_constructor(TREE_TYPE(var), NULL);
@@ -190,7 +194,8 @@ static unsigned int structleak_execute(void)
 			continue;
 
 		/* if the type is of interest, examine the variable */
-		if (TYPE_USERSPACE(type))
+		if (TYPE_USERSPACE(type) ||
+		    (byref_all && TREE_ADDRESSABLE(var)))
 			initialize(var);
 	}
 
@@ -232,6 +237,10 @@ __visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gc
 			verbose = true;
 			continue;
 		}
+		if (!strcmp(argv[i].key, "byref-all")) {
+			byref_all = true;
+			continue;
+		}
 		error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
 	}