diff gcc/asan.h @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 84e7813d76e9
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/asan.h	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,180 @@
+/* AddressSanitizer, a fast memory error detector.
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   Contributed by Kostya Serebryany <kcc@google.com>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef TREE_ASAN
+#define TREE_ASAN
+
+extern void asan_function_start (void);
+extern void asan_finish_file (void);
+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);
+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) + 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.  */
+#define ASAN_RED_ZONE_SIZE	32
+
+/* Shadow memory values for stack protection.  Left is below protected vars,
+   the first pointer in stack corresponding to that offset contains
+   ASAN_STACK_FRAME_MAGIC word, the second pointer to a string describing
+   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_USE_AFTER_RET	  0xf5
+#define ASAN_STACK_MAGIC_USE_AFTER_SCOPE  0xf8
+
+#define ASAN_STACK_FRAME_MAGIC		0x41b58ab3
+#define ASAN_STACK_RETIRED_MAGIC	0x45e0360e
+
+#define ASAN_USE_AFTER_SCOPE_ATTRIBUTE	"use after scope memory"
+
+/* Various flags for Asan builtins.  */
+enum asan_check_flags
+{
+  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.  */
+
+static inline unsigned int
+asan_red_zone_size (unsigned int size)
+{
+  unsigned int c = size & (ASAN_RED_ZONE_SIZE - 1);
+  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 */