1 files changed, 0 insertions, 257 deletions
diff --git a/scripts/gcc-plugins/structleak_plugin.c b/scripts/gcc-plugins/structleak_plugin.c
deleted file mode 100644
index d8c744233832..000000000000
--- a/scripts/gcc-plugins/structleak_plugin.c
+++ /dev/null
@@ -1,257 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright 2013-2017 by PaX Team <pageexec@freemail.hu>
- *
- * Note: the choice of the license means that the compilation process is
- *       NOT 'eligible' as defined by gcc's library exception to the GPL v3,
- *       but for the kernel it doesn't matter since it doesn't link against
- *       any of the gcc libraries
- *
- * gcc plugin to forcibly initialize certain local variables that could
- * otherwise leak kernel stack to userland if they aren't properly initialized
- * by later code
- *
- * Homepage: https://pax.grsecurity.net/
- *
- * Options:
- * -fplugin-arg-structleak_plugin-disable
- * -fplugin-arg-structleak_plugin-verbose
- * -fplugin-arg-structleak_plugin-byref
- * -fplugin-arg-structleak_plugin-byref-all
- *
- * Usage:
- * $ # for 4.5/4.6/C based 4.7
- * $ gcc -I`gcc -print-file-name=plugin`/include -I`gcc -print-file-name=plugin`/include/c-family -fPIC -shared -O2 -o structleak_plugin.so structleak_plugin.c
- * $ # for C++ based 4.7/4.8+
- * $ g++ -I`g++ -print-file-name=plugin`/include -I`g++ -print-file-name=plugin`/include/c-family -fPIC -shared -O2 -o structleak_plugin.so structleak_plugin.c
- * $ gcc -fplugin=./structleak_plugin.so test.c -O2
- *
- * TODO: eliminate redundant initializers
- */
-
-#include "gcc-common.h"
-
-/* unused C type flag in all versions 4.5-6 */
-#define TYPE_USERSPACE(TYPE) TYPE_LANG_FLAG_5(TYPE)
-
-__visible int plugin_is_GPL_compatible;
-
-static struct plugin_info structleak_plugin_info = {
-	.version	= PLUGIN_VERSION,
-	.help		= "disable\tdo not activate plugin\n"
-			  "byref\tinit structs passed by reference\n"
-			  "byref-all\tinit anything passed by reference\n"
-			  "verbose\tprint all initialized variables\n",
-};
-
-#define BYREF_STRUCT	1
-#define BYREF_ALL	2
-
-static bool verbose;
-static int byref;
-
-static tree handle_user_attribute(tree *node, tree name, tree args, int flags, bool *no_add_attrs)
-{
-	*no_add_attrs = true;
-
-	/* check for types? for now accept everything linux has to offer */
-	if (TREE_CODE(*node) != FIELD_DECL)
-		return NULL_TREE;
-
-	*no_add_attrs = false;
-	return NULL_TREE;
-}
-
-static struct attribute_spec user_attr = { };
-
-static void register_attributes(void *event_data, void *data)
-{
-	user_attr.name			= "user";
-	user_attr.handler		= handle_user_attribute;
-	user_attr.affects_type_identity	= true;
-
-	register_attribute(&user_attr);
-}
-
-static tree get_field_type(tree field)
-{
-	return strip_array_types(TREE_TYPE(field));
-}
-
-static bool is_userspace_type(tree type)
-{
-	tree field;
-
-	for (field = TYPE_FIELDS(type); field; field = TREE_CHAIN(field)) {
-		tree fieldtype = get_field_type(field);
-		enum tree_code code = TREE_CODE(fieldtype);
-
-		if (code == RECORD_TYPE || code == UNION_TYPE)
-			if (is_userspace_type(fieldtype))
-				return true;
-
-		if (lookup_attribute("user", DECL_ATTRIBUTES(field)))
-			return true;
-	}
-	return false;
-}
-
-static void finish_type(void *event_data, void *data)
-{
-	tree type = (tree)event_data;
-
-	if (type == NULL_TREE || type == error_mark_node)
-		return;
-
-	if (TREE_CODE(type) == ENUMERAL_TYPE)
-		return;
-
-	if (TYPE_USERSPACE(type))
-		return;
-
-	if (is_userspace_type(type))
-		TYPE_USERSPACE(type) = 1;
-}
-
-static void initialize(tree var)
-{
-	basic_block bb;
-	gimple_stmt_iterator gsi;
-	tree initializer;
-	gimple init_stmt;
-	tree type;
-
-	/* this is the original entry bb before the forced split */
-	bb = single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun));
-
-	/* first check if variable is already initialized, warn otherwise */
-	for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) {
-		gimple stmt = gsi_stmt(gsi);
-		tree rhs1;
-
-		/* we're looking for an assignment of a single rhs... */
-		if (!gimple_assign_single_p(stmt))
-			continue;
-		rhs1 = gimple_assign_rhs1(stmt);
-		/* ... of a non-clobbering expression... */
-		if (TREE_CLOBBER_P(rhs1))
-			continue;
-		/* ... to our variable... */
-		if (gimple_get_lhs(stmt) != var)
-			continue;
-		/* if it's an initializer then we're good */
-		if (TREE_CODE(rhs1) == CONSTRUCTOR)
-			return;
-	}
-
-	/* these aren't the 0days you're looking for */
-	if (verbose)
-		inform(DECL_SOURCE_LOCATION(var),
-			"%s variable will be forcibly initialized",
-			(byref && TREE_ADDRESSABLE(var)) ? "byref"
-							 : "userspace");
-
-	/* build the initializer expression */
-	type = TREE_TYPE(var);
-	if (AGGREGATE_TYPE_P(type))
-		initializer = build_constructor(type, NULL);
-	else
-		initializer = fold_convert(type, integer_zero_node);
-
-	/* build the initializer stmt */
-	init_stmt = gimple_build_assign(var, initializer);
-	gsi = gsi_after_labels(single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
-	gsi_insert_before(&gsi, init_stmt, GSI_NEW_STMT);
-	update_stmt(init_stmt);
-}
-
-static unsigned int structleak_execute(void)
-{
-	basic_block bb;
-	tree var;
-	unsigned int i;
-
-	/* split the first bb where we can put the forced initializers */
-	gcc_assert(single_succ_p(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
-	bb = single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun));
-	if (!single_pred_p(bb)) {
-		split_edge(single_succ_edge(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
-		gcc_assert(single_succ_p(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
-	}
-
-	/* enumerate all local variables and forcibly initialize our targets */
-	FOR_EACH_LOCAL_DECL(cfun, i, var) {
-		tree type = TREE_TYPE(var);
-
-		gcc_assert(DECL_P(var));
-		if (!auto_var_in_fn_p(var, current_function_decl))
-			continue;
-
-		/* only care about structure types unless byref-all */
-		if (byref != BYREF_ALL && TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE)
-			continue;
-
-		/* if the type is of interest, examine the variable */
-		if (TYPE_USERSPACE(type) ||
-		    (byref && TREE_ADDRESSABLE(var)))
-			initialize(var);
-	}
-
-	return 0;
-}
-
-#define PASS_NAME structleak
-#define NO_GATE
-#define PROPERTIES_REQUIRED PROP_cfg
-#define TODO_FLAGS_FINISH TODO_verify_il | TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func | TODO_remove_unused_locals | TODO_update_ssa | TODO_ggc_collect | TODO_verify_flow
-#include "gcc-generate-gimple-pass.h"
-
-__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
-{
-	int i;
-	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;
-
-	PASS_INFO(structleak, "early_optimizations", 1, PASS_POS_INSERT_BEFORE);
-
-	if (!plugin_default_version_check(version, &gcc_version)) {
-		error(G_("incompatible gcc/plugin versions"));
-		return 1;
-	}
-
-	if (strncmp(lang_hooks.name, "GNU C", 5) && !strncmp(lang_hooks.name, "GNU C+", 6)) {
-		inform(UNKNOWN_LOCATION, G_("%s supports C only, not %s"), plugin_name, lang_hooks.name);
-		enable = false;
-	}
-
-	for (i = 0; i < argc; ++i) {
-		if (!strcmp(argv[i].key, "disable")) {
-			enable = false;
-			continue;
-		}
-		if (!strcmp(argv[i].key, "verbose")) {
-			verbose = true;
-			continue;
-		}
-		if (!strcmp(argv[i].key, "byref")) {
-			byref = BYREF_STRUCT;
-			continue;
-		}
-		if (!strcmp(argv[i].key, "byref-all")) {
-			byref = BYREF_ALL;
-			continue;
-		}
-		error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
-	}
-
-	register_callback(plugin_name, PLUGIN_INFO, NULL, &structleak_plugin_info);
-	if (enable) {
-		register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &structleak_pass_info);
-		register_callback(plugin_name, PLUGIN_FINISH_TYPE, finish_type, NULL);
-	}
-	register_callback(plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL);
-
-	return 0;
-}