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1 /* AddressSanitizer, a fast memory error detector.
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2 Copyright (C) 2011-2020 Free Software Foundation, Inc.
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3 Contributed by Kostya Serebryany <kcc@google.com>
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #ifndef TREE_ASAN
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22 #define TREE_ASAN
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23
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24 extern void asan_function_start (void);
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25 extern void asan_finish_file (void);
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26 extern rtx_insn *asan_emit_stack_protection (rtx, rtx, unsigned int,
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27 HOST_WIDE_INT *, tree *, int);
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28 extern rtx_insn *asan_emit_allocas_unpoison (rtx, rtx, rtx_insn *);
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29 extern bool asan_protect_global (tree, bool ignore_decl_rtl_set_p = false);
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30 extern void initialize_sanitizer_builtins (void);
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31 extern tree asan_dynamic_init_call (bool);
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32 extern bool asan_expand_check_ifn (gimple_stmt_iterator *, bool);
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33 extern bool asan_expand_mark_ifn (gimple_stmt_iterator *);
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34 extern bool asan_expand_poison_ifn (gimple_stmt_iterator *, bool *,
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35 hash_map<tree, tree> &);
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36
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37 extern gimple_stmt_iterator create_cond_insert_point
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38 (gimple_stmt_iterator *, bool, bool, bool, basic_block *, basic_block *);
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39
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40 /* Alias set for accessing the shadow memory. */
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41 extern alias_set_type asan_shadow_set;
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42
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43 /* Hash set of labels that are either used in a goto, or their address
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44 has been taken. */
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45 extern hash_set <tree> *asan_used_labels;
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46
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47 /* Shadow memory is found at
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48 (address >> ASAN_SHADOW_SHIFT) + asan_shadow_offset (). */
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49 #define ASAN_SHADOW_SHIFT 3
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50 #define ASAN_SHADOW_GRANULARITY (1UL << ASAN_SHADOW_SHIFT)
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51
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52 /* Red zone size, stack and global variables are padded by ASAN_RED_ZONE_SIZE
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53 up to 2 * ASAN_RED_ZONE_SIZE - 1 bytes. */
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54 #define ASAN_RED_ZONE_SIZE 32
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55
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56 /* Stack variable use more compact red zones. The size includes also
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57 size of variable itself. */
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58
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59 #define ASAN_MIN_RED_ZONE_SIZE 16
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60
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61 /* Shadow memory values for stack protection. Left is below protected vars,
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62 the first pointer in stack corresponding to that offset contains
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63 ASAN_STACK_FRAME_MAGIC word, the second pointer to a string describing
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64 the frame. Middle is for padding in between variables, right is
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65 above the last protected variable and partial immediately after variables
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66 up to ASAN_RED_ZONE_SIZE alignment. */
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67 #define ASAN_STACK_MAGIC_LEFT 0xf1
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68 #define ASAN_STACK_MAGIC_MIDDLE 0xf2
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69 #define ASAN_STACK_MAGIC_RIGHT 0xf3
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70 #define ASAN_STACK_MAGIC_USE_AFTER_RET 0xf5
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71 #define ASAN_STACK_MAGIC_USE_AFTER_SCOPE 0xf8
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72
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73 #define ASAN_STACK_FRAME_MAGIC 0x41b58ab3
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74 #define ASAN_STACK_RETIRED_MAGIC 0x45e0360e
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75
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76 #define ASAN_USE_AFTER_SCOPE_ATTRIBUTE "use after scope memory"
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77
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78 /* Various flags for Asan builtins. */
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79 enum asan_check_flags
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80 {
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81 ASAN_CHECK_STORE = 1 << 0,
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82 ASAN_CHECK_SCALAR_ACCESS = 1 << 1,
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83 ASAN_CHECK_NON_ZERO_LEN = 1 << 2,
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84 ASAN_CHECK_LAST = 1 << 3
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85 };
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86
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87 /* Flags for Asan check builtins. */
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88 #define IFN_ASAN_MARK_FLAGS DEF(POISON), DEF(UNPOISON)
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89
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90 enum asan_mark_flags
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91 {
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92 #define DEF(X) ASAN_MARK_##X
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93 IFN_ASAN_MARK_FLAGS
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94 #undef DEF
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95 };
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96
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97 /* Return true if STMT is ASAN_MARK with FLAG as first argument. */
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98 extern bool asan_mark_p (gimple *stmt, enum asan_mark_flags flag);
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99
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100 /* Return the size of padding needed to insert after a protected
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101 decl of SIZE. */
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102
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103 static inline unsigned int
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104 asan_red_zone_size (unsigned int size)
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105 {
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106 unsigned int c = size & (ASAN_RED_ZONE_SIZE - 1);
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107 return c ? 2 * ASAN_RED_ZONE_SIZE - c : ASAN_RED_ZONE_SIZE;
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108 }
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109
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110 /* Return how much a stack variable occupis on a stack
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111 including a space for red zone. */
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112
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113 static inline unsigned HOST_WIDE_INT
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114 asan_var_and_redzone_size (unsigned HOST_WIDE_INT size)
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115 {
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116 if (size <= 4)
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117 return 16;
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118 else if (size <= 16)
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119 return 32;
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120 else if (size <= 128)
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121 return size + 32;
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122 else if (size <= 512)
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123 return size + 64;
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124 else if (size <= 4096)
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125 return size + 128;
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126 else
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127 return size + 256;
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128 }
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129
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130 extern bool set_asan_shadow_offset (const char *);
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131
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132 extern void set_sanitized_sections (const char *);
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133
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134 extern bool asan_sanitize_stack_p (void);
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135
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136 extern bool asan_sanitize_allocas_p (void);
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137
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138 extern hash_set<tree> *asan_handled_variables;
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139
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140 /* Return TRUE if builtin with given FCODE will be intercepted by
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141 libasan. */
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142
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143 static inline bool
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144 asan_intercepted_p (enum built_in_function fcode)
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145 {
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146 return fcode == BUILT_IN_INDEX
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147 || fcode == BUILT_IN_MEMCHR
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148 || fcode == BUILT_IN_MEMCMP
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149 || fcode == BUILT_IN_MEMCPY
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150 || fcode == BUILT_IN_MEMMOVE
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151 || fcode == BUILT_IN_MEMSET
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152 || fcode == BUILT_IN_STRCASECMP
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153 || fcode == BUILT_IN_STRCAT
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154 || fcode == BUILT_IN_STRCHR
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155 || fcode == BUILT_IN_STRCMP
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156 || fcode == BUILT_IN_STRCPY
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157 || fcode == BUILT_IN_STRDUP
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158 || fcode == BUILT_IN_STRLEN
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159 || fcode == BUILT_IN_STRNCASECMP
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160 || fcode == BUILT_IN_STRNCAT
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161 || fcode == BUILT_IN_STRNCMP
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162 || fcode == BUILT_IN_STRCSPN
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163 || fcode == BUILT_IN_STRPBRK
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164 || fcode == BUILT_IN_STRSPN
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165 || fcode == BUILT_IN_STRSTR
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166 || fcode == BUILT_IN_STRNCPY;
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167 }
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168
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169 /* Return TRUE if we should instrument for use-after-scope sanity checking. */
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170
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171 static inline bool
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172 asan_sanitize_use_after_scope (void)
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173 {
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174 return (flag_sanitize_address_use_after_scope && asan_sanitize_stack_p ());
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175 }
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176
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177 /* Return true if DECL should be guarded on the stack. */
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178
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179 static inline bool
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180 asan_protect_stack_decl (tree decl)
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181 {
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182 return DECL_P (decl)
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183 && (!DECL_ARTIFICIAL (decl)
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184 || (asan_sanitize_use_after_scope () && TREE_ADDRESSABLE (decl)));
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185 }
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186
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187 /* Return true when flag_sanitize & FLAG is non-zero. If FN is non-null,
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188 remove all flags mentioned in "no_sanitize" of DECL_ATTRIBUTES. */
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189
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190 static inline bool
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191 sanitize_flags_p (unsigned int flag, const_tree fn = current_function_decl)
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192 {
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193 unsigned int result_flags = flag_sanitize & flag;
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194 if (result_flags == 0)
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195 return false;
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196
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197 if (fn != NULL_TREE)
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198 {
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199 tree value = lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (fn));
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200 if (value)
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201 result_flags &= ~tree_to_uhwi (TREE_VALUE (value));
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202 }
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203
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204 return result_flags;
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205 }
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206
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207 #endif /* TREE_ASAN */
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