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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/scripts/gcc-plugins/structleak_plugin.c
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@@ -11,11 +11,12 @@
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  * otherwise leak kernel stack to userland if they aren't properly initialized
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  * by later code
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  *
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- * Homepage: http://pax.grsecurity.net/
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+ * Homepage: https://pax.grsecurity.net/
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  *
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  * Options:
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  * -fplugin-arg-structleak_plugin-disable
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  * -fplugin-arg-structleak_plugin-verbose
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+ * -fplugin-arg-structleak_plugin-byref
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  * -fplugin-arg-structleak_plugin-byref-all
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  *
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  * Usage:
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@@ -26,7 +27,6 @@
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  * $ gcc -fplugin=./structleak_plugin.so test.c -O2
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  *
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  * TODO: eliminate redundant initializers
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- *       increase type coverage
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  */
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 #include "gcc-common.h"
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@@ -37,13 +37,18 @@
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 __visible int plugin_is_GPL_compatible;
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 static struct plugin_info structleak_plugin_info = {
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-	.version	= "201607271510vanilla",
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+	.version	= "20190125vanilla",
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 	.help		= "disable\tdo not activate plugin\n"
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-			   "verbose\tprint all initialized variables\n",
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+			  "byref\tinit structs passed by reference\n"
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+			  "byref-all\tinit anything passed by reference\n"
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+			  "verbose\tprint all initialized variables\n",
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 };
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+#define BYREF_STRUCT	1
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+#define BYREF_ALL	2
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+
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 static bool verbose;
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-static bool byref_all;
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+static int byref;
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 static tree handle_user_attribute(tree *node, tree name, tree args, int flags, bool *no_add_attrs)
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 {
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@@ -118,6 +123,7 @@
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 	gimple_stmt_iterator gsi;
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 	tree initializer;
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 	gimple init_stmt;
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+	tree type;
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 	/* this is the original entry bb before the forced split */
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 	bb = single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun));
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@@ -148,11 +154,15 @@
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 	if (verbose)
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 		inform(DECL_SOURCE_LOCATION(var),
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 			"%s variable will be forcibly initialized",
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-			(byref_all && TREE_ADDRESSABLE(var)) ? "byref"
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-							     : "userspace");
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+			(byref && TREE_ADDRESSABLE(var)) ? "byref"
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+							 : "userspace");
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 	/* build the initializer expression */
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-	initializer = build_constructor(TREE_TYPE(var), NULL);
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+	type = TREE_TYPE(var);
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+	if (AGGREGATE_TYPE_P(type))
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+		initializer = build_constructor(type, NULL);
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+	else
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+		initializer = fold_convert(type, integer_zero_node);
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 	/* build the initializer stmt */
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 	init_stmt = gimple_build_assign(var, initializer);
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@@ -184,13 +194,13 @@
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 		if (!auto_var_in_fn_p(var, current_function_decl))
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 			continue;
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-		/* only care about structure types */
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-		if (TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE)
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+		/* only care about structure types unless byref-all */
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+		if (byref != BYREF_ALL && TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE)
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 			continue;
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 		/* if the type is of interest, examine the variable */
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 		if (TYPE_USERSPACE(type) ||
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-		    (byref_all && TREE_ADDRESSABLE(var)))
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+		    (byref && TREE_ADDRESSABLE(var)))
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 			initialize(var);
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 	}
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@@ -232,8 +242,12 @@
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 			verbose = true;
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 			continue;
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 		}
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+		if (!strcmp(argv[i].key, "byref")) {
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+			byref = BYREF_STRUCT;
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+			continue;
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+		}
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 		if (!strcmp(argv[i].key, "byref-all")) {
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-			byref_all = true;
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+			byref = BYREF_ALL;
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 			continue;
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 		}
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 		error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);