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37d6f666 | 1 | /* AddressSanitizer, a fast memory error detector. |
85ec4feb | 2 | Copyright (C) 2011-2018 Free Software Foundation, Inc. |
37d6f666 WM |
3 | Contributed by Kostya Serebryany <kcc@google.com> |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #ifndef TREE_ASAN | |
22 | #define TREE_ASAN | |
23 | ||
ef1b3fda | 24 | extern void asan_function_start (void); |
f3ddd692 | 25 | extern void asan_finish_file (void); |
3a4abd2f DM |
26 | extern rtx_insn *asan_emit_stack_protection (rtx, rtx, unsigned int, |
27 | HOST_WIDE_INT *, tree *, int); | |
e3174bdf | 28 | extern rtx_insn *asan_emit_allocas_unpoison (rtx, rtx, rtx_insn *); |
1069dc25 | 29 | extern bool asan_protect_global (tree, bool ignore_decl_rtl_set_p = false); |
0e668eaf | 30 | extern void initialize_sanitizer_builtins (void); |
59b36ecf | 31 | extern tree asan_dynamic_init_call (bool); |
06cefae9 | 32 | extern bool asan_expand_check_ifn (gimple_stmt_iterator *, bool); |
6dc4a604 | 33 | extern bool asan_expand_mark_ifn (gimple_stmt_iterator *); |
c7775327 ML |
34 | extern bool asan_expand_poison_ifn (gimple_stmt_iterator *, bool *, |
35 | hash_map<tree, tree> &); | |
f3ddd692 | 36 | |
ac0ff9f2 JJ |
37 | extern gimple_stmt_iterator create_cond_insert_point |
38 | (gimple_stmt_iterator *, bool, bool, bool, basic_block *, basic_block *); | |
39 | ||
f3ddd692 JJ |
40 | /* Alias set for accessing the shadow memory. */ |
41 | extern alias_set_type asan_shadow_set; | |
37d6f666 | 42 | |
6dc4a604 ML |
43 | /* Hash set of labels that are either used in a goto, or their address |
44 | has been taken. */ | |
45 | extern hash_set <tree> *asan_used_labels; | |
46 | ||
dfe06d3e | 47 | /* Shadow memory is found at |
fd960af2 | 48 | (address >> ASAN_SHADOW_SHIFT) + asan_shadow_offset (). */ |
dfe06d3e | 49 | #define ASAN_SHADOW_SHIFT 3 |
6dc4a604 | 50 | #define ASAN_SHADOW_GRANULARITY (1UL << ASAN_SHADOW_SHIFT) |
dfe06d3e | 51 | |
f3ddd692 JJ |
52 | /* Red zone size, stack and global variables are padded by ASAN_RED_ZONE_SIZE |
53 | up to 2 * ASAN_RED_ZONE_SIZE - 1 bytes. */ | |
54 | #define ASAN_RED_ZONE_SIZE 32 | |
55 | ||
56 | /* Shadow memory values for stack protection. Left is below protected vars, | |
57 | the first pointer in stack corresponding to that offset contains | |
58 | ASAN_STACK_FRAME_MAGIC word, the second pointer to a string describing | |
59 | the frame. Middle is for padding in between variables, right is | |
60 | above the last protected variable and partial immediately after variables | |
61 | up to ASAN_RED_ZONE_SIZE alignment. */ | |
6dc4a604 ML |
62 | #define ASAN_STACK_MAGIC_LEFT 0xf1 |
63 | #define ASAN_STACK_MAGIC_MIDDLE 0xf2 | |
64 | #define ASAN_STACK_MAGIC_RIGHT 0xf3 | |
6dc4a604 ML |
65 | #define ASAN_STACK_MAGIC_USE_AFTER_RET 0xf5 |
66 | #define ASAN_STACK_MAGIC_USE_AFTER_SCOPE 0xf8 | |
f3ddd692 | 67 | |
e361382f JJ |
68 | #define ASAN_STACK_FRAME_MAGIC 0x41b58ab3 |
69 | #define ASAN_STACK_RETIRED_MAGIC 0x45e0360e | |
f3ddd692 | 70 | |
f6b9f2ff ML |
71 | #define ASAN_USE_AFTER_SCOPE_ATTRIBUTE "use after scope memory" |
72 | ||
6dc4a604 ML |
73 | /* Various flags for Asan builtins. */ |
74 | enum asan_check_flags | |
f3ddd692 | 75 | { |
6dc4a604 ML |
76 | ASAN_CHECK_STORE = 1 << 0, |
77 | ASAN_CHECK_SCALAR_ACCESS = 1 << 1, | |
78 | ASAN_CHECK_NON_ZERO_LEN = 1 << 2, | |
79 | ASAN_CHECK_LAST = 1 << 3 | |
80 | }; | |
81 | ||
82 | /* Flags for Asan check builtins. */ | |
56b7aede ML |
83 | #define IFN_ASAN_MARK_FLAGS DEF(POISON), DEF(UNPOISON) |
84 | ||
6dc4a604 ML |
85 | enum asan_mark_flags |
86 | { | |
56b7aede ML |
87 | #define DEF(X) ASAN_MARK_##X |
88 | IFN_ASAN_MARK_FLAGS | |
89 | #undef DEF | |
6dc4a604 | 90 | }; |
f3ddd692 | 91 | |
56b7aede ML |
92 | /* Return true if STMT is ASAN_MARK with FLAG as first argument. */ |
93 | extern bool asan_mark_p (gimple *stmt, enum asan_mark_flags flag); | |
94 | ||
8240018b JJ |
95 | /* Return the size of padding needed to insert after a protected |
96 | decl of SIZE. */ | |
97 | ||
98 | static inline unsigned int | |
99 | asan_red_zone_size (unsigned int size) | |
100 | { | |
101 | unsigned int c = size & (ASAN_RED_ZONE_SIZE - 1); | |
102 | return c ? 2 * ASAN_RED_ZONE_SIZE - c : ASAN_RED_ZONE_SIZE; | |
103 | } | |
104 | ||
fd960af2 YG |
105 | extern bool set_asan_shadow_offset (const char *); |
106 | ||
18af8d16 YG |
107 | extern void set_sanitized_sections (const char *); |
108 | ||
6dc4a604 ML |
109 | extern bool asan_sanitize_stack_p (void); |
110 | ||
5094f7d5 MO |
111 | extern bool asan_sanitize_allocas_p (void); |
112 | ||
bdea98ca MO |
113 | /* Return TRUE if builtin with given FCODE will be intercepted by |
114 | libasan. */ | |
115 | ||
116 | static inline bool | |
117 | asan_intercepted_p (enum built_in_function fcode) | |
118 | { | |
119 | return fcode == BUILT_IN_INDEX | |
120 | || fcode == BUILT_IN_MEMCHR | |
121 | || fcode == BUILT_IN_MEMCMP | |
122 | || fcode == BUILT_IN_MEMCPY | |
123 | || fcode == BUILT_IN_MEMMOVE | |
124 | || fcode == BUILT_IN_MEMSET | |
125 | || fcode == BUILT_IN_STRCASECMP | |
126 | || fcode == BUILT_IN_STRCAT | |
127 | || fcode == BUILT_IN_STRCHR | |
128 | || fcode == BUILT_IN_STRCMP | |
129 | || fcode == BUILT_IN_STRCPY | |
130 | || fcode == BUILT_IN_STRDUP | |
131 | || fcode == BUILT_IN_STRLEN | |
132 | || fcode == BUILT_IN_STRNCASECMP | |
133 | || fcode == BUILT_IN_STRNCAT | |
134 | || fcode == BUILT_IN_STRNCMP | |
0290a292 MO |
135 | || fcode == BUILT_IN_STRCSPN |
136 | || fcode == BUILT_IN_STRPBRK | |
137 | || fcode == BUILT_IN_STRSPN | |
138 | || fcode == BUILT_IN_STRSTR | |
bdea98ca MO |
139 | || fcode == BUILT_IN_STRNCPY; |
140 | } | |
6dc4a604 ML |
141 | |
142 | /* Return TRUE if we should instrument for use-after-scope sanity checking. */ | |
143 | ||
144 | static inline bool | |
145 | asan_sanitize_use_after_scope (void) | |
146 | { | |
147 | return (flag_sanitize_address_use_after_scope && asan_sanitize_stack_p ()); | |
148 | } | |
149 | ||
6dc4a604 ML |
150 | /* Return true if DECL should be guarded on the stack. */ |
151 | ||
152 | static inline bool | |
153 | asan_protect_stack_decl (tree decl) | |
154 | { | |
155 | return DECL_P (decl) | |
156 | && (!DECL_ARTIFICIAL (decl) | |
157 | || (asan_sanitize_use_after_scope () && TREE_ADDRESSABLE (decl))); | |
158 | } | |
159 | ||
45b2222a ML |
160 | /* Return true when flag_sanitize & FLAG is non-zero. If FN is non-null, |
161 | remove all flags mentioned in "no_sanitize" of DECL_ATTRIBUTES. */ | |
162 | ||
163 | static inline bool | |
164 | sanitize_flags_p (unsigned int flag, const_tree fn = current_function_decl) | |
165 | { | |
166 | unsigned int result_flags = flag_sanitize & flag; | |
167 | if (result_flags == 0) | |
168 | return false; | |
169 | ||
170 | if (fn != NULL_TREE) | |
171 | { | |
172 | tree value = lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (fn)); | |
173 | if (value) | |
174 | result_flags &= ~tree_to_uhwi (TREE_VALUE (value)); | |
175 | } | |
176 | ||
177 | return result_flags; | |
178 | } | |
179 | ||
37d6f666 | 180 | #endif /* TREE_ASAN */ |