Updates to the gcc-plugins:
- infrastructure updates (gcc-common.h)
- introduce structleak plugin for forced initialization of some structures
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Version: GnuPG v1
Comment: Kees Cook <kees@outflux.net>
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-----END PGP SIGNATURE-----
Merge tag 'gcc-plugins-v4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull gcc-plugins updates from Kees Cook:
"This includes infrastructure updates and the structleak plugin, which
performs forced initialization of certain structures to avoid possible
information exposures to userspace.
Summary:
- infrastructure updates (gcc-common.h)
- introduce structleak plugin for forced initialization of some
structures"
* tag 'gcc-plugins-v4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
gcc-plugins: Add structleak for more stack initialization
gcc-plugins: consolidate on PASS_INFO macro
gcc-plugins: add PASS_INFO and build_const_char_string()
zero-colors
Linus Torvalds
commit
1e74a2eb1f
22
arch/Kconfig
22
arch/Kconfig
|
|
@ -410,6 +410,28 @@ config GCC_PLUGIN_LATENT_ENTROPY
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* https://grsecurity.net/
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* https://pax.grsecurity.net/
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config GCC_PLUGIN_STRUCTLEAK
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bool "Force initialization of variables containing userspace addresses"
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depends on GCC_PLUGINS
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help
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This plugin zero-initializes any structures that containing a
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__user attribute. This can prevent some classes of information
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exposures.
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This plugin was ported from grsecurity/PaX. More information at:
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* https://grsecurity.net/
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* https://pax.grsecurity.net/
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config GCC_PLUGIN_STRUCTLEAK_VERBOSE
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bool "Report forcefully initialized variables"
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depends on GCC_PLUGIN_STRUCTLEAK
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depends on !COMPILE_TEST
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help
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This option will cause a warning to be printed each time the
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structleak plugin finds a variable it thinks needs to be
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initialized. Since not all existing initializers are detected
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by the plugin, this can produce false positive warnings.
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config HAVE_CC_STACKPROTECTOR
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bool
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help
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@ -27,7 +27,11 @@ extern void __chk_user_ptr(const volatile void __user *);
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extern void __chk_io_ptr(const volatile void __iomem *);
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# define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
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#else /* __CHECKER__ */
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# define __user
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# ifdef STRUCTLEAK_PLUGIN
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# define __user __attribute__((user))
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# else
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# define __user
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# endif
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# define __kernel
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# define __safe
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# define __force
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@ -25,6 +25,10 @@ ifdef CONFIG_GCC_PLUGINS
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endif
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endif
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gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += structleak_plugin.so
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE) += -fplugin-arg-structleak_plugin-verbose
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gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += -DSTRUCTLEAK_PLUGIN
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GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y))
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export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN GCC_PLUGIN_SUBDIR
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@ -52,12 +52,8 @@ static unsigned int cyc_complexity_execute(void)
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__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
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{
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const char * const plugin_name = plugin_info->base_name;
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struct register_pass_info cyc_complexity_pass_info;
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cyc_complexity_pass_info.pass = make_cyc_complexity_pass();
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cyc_complexity_pass_info.reference_pass_name = "ssa";
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cyc_complexity_pass_info.ref_pass_instance_number = 1;
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cyc_complexity_pass_info.pos_op = PASS_POS_INSERT_AFTER;
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PASS_INFO(cyc_complexity, "ssa", 1, PASS_POS_INSERT_AFTER);
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if (!plugin_default_version_check(version, &gcc_version)) {
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error(G_("incompatible gcc/plugin versions"));
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@ -26,6 +26,9 @@
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#include "except.h"
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#include "function.h"
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#include "toplev.h"
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#if BUILDING_GCC_VERSION >= 5000
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#include "expr.h"
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#endif
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#include "basic-block.h"
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#include "intl.h"
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#include "ggc.h"
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@ -80,6 +83,9 @@
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#include "diagnostic.h"
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#include "tree-dump.h"
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#include "tree-pass.h"
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#if BUILDING_GCC_VERSION >= 4009
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#include "pass_manager.h"
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#endif
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#include "predict.h"
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#include "ipa-utils.h"
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@ -119,20 +125,17 @@
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#include "builtins.h"
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#endif
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/* #include "expr.h" where are you... */
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extern rtx emit_move_insn(rtx x, rtx y);
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/* missing from basic_block.h... */
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extern void debug_dominance_info(enum cdi_direction dir);
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extern void debug_dominance_tree(enum cdi_direction dir, basic_block root);
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void debug_dominance_info(enum cdi_direction dir);
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void debug_dominance_tree(enum cdi_direction dir, basic_block root);
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#if BUILDING_GCC_VERSION == 4006
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extern void debug_gimple_stmt(gimple);
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extern void debug_gimple_seq(gimple_seq);
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extern void print_gimple_seq(FILE *, gimple_seq, int, int);
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extern void print_gimple_stmt(FILE *, gimple, int, int);
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extern void print_gimple_expr(FILE *, gimple, int, int);
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extern void dump_gimple_stmt(pretty_printer *, gimple, int, int);
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void debug_gimple_stmt(gimple);
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void debug_gimple_seq(gimple_seq);
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void print_gimple_seq(FILE *, gimple_seq, int, int);
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void print_gimple_stmt(FILE *, gimple, int, int);
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void print_gimple_expr(FILE *, gimple, int, int);
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void dump_gimple_stmt(pretty_printer *, gimple, int, int);
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#endif
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#define __unused __attribute__((__unused__))
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@ -146,6 +149,29 @@ extern void dump_gimple_stmt(pretty_printer *, gimple, int, int);
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/* should come from c-tree.h if only it were installed for gcc 4.5... */
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#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1(TYPE)
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static inline tree build_const_char_string(int len, const char *str)
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{
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tree cstr, elem, index, type;
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cstr = build_string(len, str);
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elem = build_type_variant(char_type_node, 1, 0);
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index = build_index_type(size_int(len - 1));
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type = build_array_type(elem, index);
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TREE_TYPE(cstr) = type;
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TREE_CONSTANT(cstr) = 1;
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TREE_READONLY(cstr) = 1;
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TREE_STATIC(cstr) = 1;
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return cstr;
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}
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#define PASS_INFO(NAME, REF, ID, POS) \
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struct register_pass_info NAME##_pass_info = { \
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.pass = make_##NAME##_pass(), \
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.reference_pass_name = REF, \
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.ref_pass_instance_number = ID, \
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.pos_op = POS, \
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}
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#if BUILDING_GCC_VERSION == 4005
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#define FOR_EACH_LOCAL_DECL(FUN, I, D) \
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for (tree vars = (FUN)->local_decls, (I) = 0; \
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@ -527,6 +553,8 @@ static inline const greturn *as_a_const_greturn(const_gimple stmt)
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#define section_name_prefix LTO_SECTION_NAME_PREFIX
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#define fatal_error(loc, gmsgid, ...) fatal_error((gmsgid), __VA_ARGS__)
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rtx emit_move_insn(rtx x, rtx y);
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typedef struct rtx_def rtx_insn;
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static inline const char *get_decl_section_name(const_tree decl)
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@ -643,6 +671,11 @@ static inline const greturn *as_a_const_greturn(const_gimple stmt)
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#define NODE_DECL(node) (node)->decl
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#define cgraph_node_name(node) (node)->name()
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#define NODE_IMPLICIT_ALIAS(node) (node)->cpp_implicit_alias
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static inline opt_pass *get_pass_for_id(int id)
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{
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return g->get_passes()->get_pass_for_id(id);
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}
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#endif
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#if BUILDING_GCC_VERSION >= 5000 && BUILDING_GCC_VERSION < 6000
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@ -592,12 +592,6 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
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const struct plugin_argument * const argv = plugin_info->argv;
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int i;
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struct register_pass_info latent_entropy_pass_info;
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latent_entropy_pass_info.pass = make_latent_entropy_pass();
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latent_entropy_pass_info.reference_pass_name = "optimized";
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latent_entropy_pass_info.ref_pass_instance_number = 1;
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latent_entropy_pass_info.pos_op = PASS_POS_INSERT_BEFORE;
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static const struct ggc_root_tab gt_ggc_r_gt_latent_entropy[] = {
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{
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.base = &latent_entropy_decl,
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@ -609,6 +603,8 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
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LAST_GGC_ROOT_TAB
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};
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PASS_INFO(latent_entropy, "optimized", 1, PASS_POS_INSERT_BEFORE);
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if (!plugin_default_version_check(version, &gcc_version)) {
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error(G_("incompatible gcc/plugin versions"));
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return 1;
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@ -89,7 +89,6 @@ static void sancov_start_unit(void __unused *gcc_data, void __unused *user_data)
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__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
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{
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int i;
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struct register_pass_info sancov_plugin_pass_info;
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const char * const plugin_name = plugin_info->base_name;
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const int argc = plugin_info->argc;
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const struct plugin_argument * const argv = plugin_info->argv;
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@ -107,14 +106,11 @@ __visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gc
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};
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/* BBs can be split afterwards?? */
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sancov_plugin_pass_info.pass = make_sancov_pass();
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#if BUILDING_GCC_VERSION >= 4009
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sancov_plugin_pass_info.reference_pass_name = "asan";
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PASS_INFO(sancov, "asan", 0, PASS_POS_INSERT_BEFORE);
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#else
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sancov_plugin_pass_info.reference_pass_name = "nrv";
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PASS_INFO(sancov, "nrv", 1, PASS_POS_INSERT_BEFORE);
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#endif
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sancov_plugin_pass_info.ref_pass_instance_number = 0;
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sancov_plugin_pass_info.pos_op = PASS_POS_INSERT_BEFORE;
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if (!plugin_default_version_check(version, &gcc_version)) {
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error(G_("incompatible gcc/plugin versions"));
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@ -0,0 +1,246 @@
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/*
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* Copyright 2013-2017 by PaX Team <pageexec@freemail.hu>
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* Licensed under the GPL v2
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*
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* Note: the choice of the license means that the compilation process is
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* NOT 'eligible' as defined by gcc's library exception to the GPL v3,
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* but for the kernel it doesn't matter since it doesn't link against
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* any of the gcc libraries
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*
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* gcc plugin to forcibly initialize certain local variables that could
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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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*
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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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*
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* Usage:
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* $ # for 4.5/4.6/C based 4.7
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* $ 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
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* $ # for C++ based 4.7/4.8+
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* $ 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
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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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/* unused C type flag in all versions 4.5-6 */
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#define TYPE_USERSPACE(TYPE) TYPE_LANG_FLAG_5(TYPE)
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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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.help = "disable\tdo not activate plugin\n"
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"verbose\tprint all initialized variables\n",
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||||
};
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|
||||
static bool verbose;
|
||||
|
||||
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 = {
|
||||
.name = "user",
|
||||
.min_length = 0,
|
||||
.max_length = 0,
|
||||
.decl_required = false,
|
||||
.type_required = false,
|
||||
.function_type_required = false,
|
||||
.handler = handle_user_attribute,
|
||||
#if BUILDING_GCC_VERSION >= 4007
|
||||
.affects_type_identity = true
|
||||
#endif
|
||||
};
|
||||
|
||||
static void register_attributes(void *event_data, void *data)
|
||||
{
|
||||
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 BUILDING_GCC_VERSION >= 5000
|
||||
if (TREE_CODE(type) == ENUMERAL_TYPE)
|
||||
return;
|
||||
#endif
|
||||
|
||||
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;
|
||||
|
||||
/* 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);
|
||||
#if BUILDING_GCC_VERSION >= 4007
|
||||
/* ... of a non-clobbering expression... */
|
||||
if (TREE_CLOBBER_P(rhs1))
|
||||
continue;
|
||||
#endif
|
||||
/* ... 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),
|
||||
"userspace variable will be forcibly initialized");
|
||||
|
||||
/* build the initializer expression */
|
||||
initializer = build_constructor(TREE_TYPE(var), NULL);
|
||||
|
||||
/* 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;
|
||||
unsigned int ret = 0;
|
||||
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 */
|
||||
if (TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE)
|
||||
continue;
|
||||
|
||||
/* if the type is of interest, examine the variable */
|
||||
if (TYPE_USERSPACE(type))
|
||||
initialize(var);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
#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;
|
||||
}
|
||||
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;
|
||||
}
|
||||
Loading…
Reference in New Issue