/* AddressSanitizer, a fast memory error detector.
- Copyright (C) 2011-2013 Free Software Foundation, Inc.
+ Copyright (C) 2011-2018 Free Software Foundation, Inc.
Contributed by Kostya Serebryany <kcc@google.com>
This file is part of GCC.
extern void asan_function_start (void);
extern void asan_finish_file (void);
-extern rtx asan_emit_stack_protection (rtx, HOST_WIDE_INT *, tree *, int);
-extern bool asan_protect_global (tree);
+extern rtx_insn *asan_emit_stack_protection (rtx, rtx, unsigned int,
+ HOST_WIDE_INT *, tree *, int);
+extern rtx_insn *asan_emit_allocas_unpoison (rtx, rtx, rtx_insn *);
+extern bool asan_protect_global (tree, bool ignore_decl_rtl_set_p = false);
extern void initialize_sanitizer_builtins (void);
extern tree asan_dynamic_init_call (bool);
+extern bool asan_expand_check_ifn (gimple_stmt_iterator *, bool);
+extern bool asan_expand_mark_ifn (gimple_stmt_iterator *);
+extern bool asan_expand_poison_ifn (gimple_stmt_iterator *, bool *,
+ hash_map<tree, tree> &);
+
+extern gimple_stmt_iterator create_cond_insert_point
+ (gimple_stmt_iterator *, bool, bool, bool, basic_block *, basic_block *);
/* Alias set for accessing the shadow memory. */
extern alias_set_type asan_shadow_set;
+/* Hash set of labels that are either used in a goto, or their address
+ has been taken. */
+extern hash_set <tree> *asan_used_labels;
+
/* Shadow memory is found at
- (address >> ASAN_SHADOW_SHIFT) + targetm.asan_shadow_offset (). */
+ (address >> ASAN_SHADOW_SHIFT) + asan_shadow_offset (). */
#define ASAN_SHADOW_SHIFT 3
+#define ASAN_SHADOW_GRANULARITY (1UL << ASAN_SHADOW_SHIFT)
/* Red zone size, stack and global variables are padded by ASAN_RED_ZONE_SIZE
up to 2 * ASAN_RED_ZONE_SIZE - 1 bytes. */
the frame. Middle is for padding in between variables, right is
above the last protected variable and partial immediately after variables
up to ASAN_RED_ZONE_SIZE alignment. */
-#define ASAN_STACK_MAGIC_LEFT 0xf1
-#define ASAN_STACK_MAGIC_MIDDLE 0xf2
-#define ASAN_STACK_MAGIC_RIGHT 0xf3
-#define ASAN_STACK_MAGIC_PARTIAL 0xf4
+#define ASAN_STACK_MAGIC_LEFT 0xf1
+#define ASAN_STACK_MAGIC_MIDDLE 0xf2
+#define ASAN_STACK_MAGIC_RIGHT 0xf3
+#define ASAN_STACK_MAGIC_USE_AFTER_RET 0xf5
+#define ASAN_STACK_MAGIC_USE_AFTER_SCOPE 0xf8
-#define ASAN_STACK_FRAME_MAGIC 0x41b58ab3
+#define ASAN_STACK_FRAME_MAGIC 0x41b58ab3
+#define ASAN_STACK_RETIRED_MAGIC 0x45e0360e
-/* Return true if DECL should be guarded on the stack. */
+#define ASAN_USE_AFTER_SCOPE_ATTRIBUTE "use after scope memory"
-static inline bool
-asan_protect_stack_decl (tree decl)
+/* Various flags for Asan builtins. */
+enum asan_check_flags
{
- return DECL_P (decl) && !DECL_ARTIFICIAL (decl);
-}
+ ASAN_CHECK_STORE = 1 << 0,
+ ASAN_CHECK_SCALAR_ACCESS = 1 << 1,
+ ASAN_CHECK_NON_ZERO_LEN = 1 << 2,
+ ASAN_CHECK_LAST = 1 << 3
+};
+
+/* Flags for Asan check builtins. */
+#define IFN_ASAN_MARK_FLAGS DEF(POISON), DEF(UNPOISON)
+
+enum asan_mark_flags
+{
+#define DEF(X) ASAN_MARK_##X
+ IFN_ASAN_MARK_FLAGS
+#undef DEF
+};
+
+/* Return true if STMT is ASAN_MARK with FLAG as first argument. */
+extern bool asan_mark_p (gimple *stmt, enum asan_mark_flags flag);
/* Return the size of padding needed to insert after a protected
decl of SIZE. */
return c ? 2 * ASAN_RED_ZONE_SIZE - c : ASAN_RED_ZONE_SIZE;
}
+extern bool set_asan_shadow_offset (const char *);
+
+extern void set_sanitized_sections (const char *);
+
+extern bool asan_sanitize_stack_p (void);
+
+extern bool asan_sanitize_allocas_p (void);
+
+/* Return TRUE if builtin with given FCODE will be intercepted by
+ libasan. */
+
+static inline bool
+asan_intercepted_p (enum built_in_function fcode)
+{
+ return fcode == BUILT_IN_INDEX
+ || fcode == BUILT_IN_MEMCHR
+ || fcode == BUILT_IN_MEMCMP
+ || fcode == BUILT_IN_MEMCPY
+ || fcode == BUILT_IN_MEMMOVE
+ || fcode == BUILT_IN_MEMSET
+ || fcode == BUILT_IN_STRCASECMP
+ || fcode == BUILT_IN_STRCAT
+ || fcode == BUILT_IN_STRCHR
+ || fcode == BUILT_IN_STRCMP
+ || fcode == BUILT_IN_STRCPY
+ || fcode == BUILT_IN_STRDUP
+ || fcode == BUILT_IN_STRLEN
+ || fcode == BUILT_IN_STRNCASECMP
+ || fcode == BUILT_IN_STRNCAT
+ || fcode == BUILT_IN_STRNCMP
+ || fcode == BUILT_IN_STRCSPN
+ || fcode == BUILT_IN_STRPBRK
+ || fcode == BUILT_IN_STRSPN
+ || fcode == BUILT_IN_STRSTR
+ || fcode == BUILT_IN_STRNCPY;
+}
+
+/* Return TRUE if we should instrument for use-after-scope sanity checking. */
+
+static inline bool
+asan_sanitize_use_after_scope (void)
+{
+ return (flag_sanitize_address_use_after_scope && asan_sanitize_stack_p ());
+}
+
+/* Return true if DECL should be guarded on the stack. */
+
+static inline bool
+asan_protect_stack_decl (tree decl)
+{
+ return DECL_P (decl)
+ && (!DECL_ARTIFICIAL (decl)
+ || (asan_sanitize_use_after_scope () && TREE_ADDRESSABLE (decl)));
+}
+
+/* Return true when flag_sanitize & FLAG is non-zero. If FN is non-null,
+ remove all flags mentioned in "no_sanitize" of DECL_ATTRIBUTES. */
+
+static inline bool
+sanitize_flags_p (unsigned int flag, const_tree fn = current_function_decl)
+{
+ unsigned int result_flags = flag_sanitize & flag;
+ if (result_flags == 0)
+ return false;
+
+ if (fn != NULL_TREE)
+ {
+ tree value = lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (fn));
+ if (value)
+ result_flags &= ~tree_to_uhwi (TREE_VALUE (value));
+ }
+
+ return result_flags;
+}
+
#endif /* TREE_ASAN */
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