Mercurial > dropbear

annotate dbmalloc.c @ 1717:295377ecbf49

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Add DEVELOPING.md
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Jun 2020 22:30:28 +0800
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "dbmalloc.h"
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2 #include "dbutil.h"
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3
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4
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5 void * m_calloc(size_t nmemb, size_t size) {
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6 if (SIZE_T_MAX / nmemb < size) {
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7 dropbear_exit("m_calloc failed");
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8 }
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9 return m_malloc(nmemb*size);
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10 }
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11
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12 void * m_strdup(const char * str) {
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13 char* ret;
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14 unsigned int len;
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15 len = strlen(str);
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16
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17 ret = m_malloc(len+1);
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18 if (ret == NULL) {
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19 dropbear_exit("m_strdup failed");
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20 }
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21 memcpy(ret, str, len+1);
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22 return ret;
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23 }
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24
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25 #if !DROPBEAR_TRACKING_MALLOC
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26
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27 /* Simple wrappers around malloc etc */
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28 void * m_malloc(size_t size) {
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29
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30 void* ret;
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31
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32 if (size == 0) {
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33 dropbear_exit("m_malloc failed");
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34 }
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35 ret = calloc(1, size);
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36 if (ret == NULL) {
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37 dropbear_exit("m_malloc failed");
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38 }
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39 return ret;
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40
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41 }
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42
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43 void * m_realloc(void* ptr, size_t size) {
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44
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45 void *ret;
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46
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47 if (size == 0) {
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48 dropbear_exit("m_realloc failed");
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49 }
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50 ret = realloc(ptr, size);
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51 if (ret == NULL) {
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52 dropbear_exit("m_realloc failed");
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53 }
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54 return ret;
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55 }
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56
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57
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58 #else
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59
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60 /* For fuzzing */
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61
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62 struct dbmalloc_header {
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63 unsigned int epoch;
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64 struct dbmalloc_header *prev;
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65 struct dbmalloc_header *next;
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66 };
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67
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68 static void put_alloc(struct dbmalloc_header *header);
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69 static void remove_alloc(struct dbmalloc_header *header);
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70
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71 /* end of the linked list */
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72 static struct dbmalloc_header* staple;
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73
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74 unsigned int current_epoch = 0;
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75
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76 void m_malloc_set_epoch(unsigned int epoch) {
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77 current_epoch = epoch;
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78 }
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79
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80 void m_malloc_free_epoch(unsigned int epoch, int dofree) {
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81 struct dbmalloc_header* header;
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82 struct dbmalloc_header* nextheader = NULL;
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83 struct dbmalloc_header* oldstaple = staple;
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84 staple = NULL;
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85 /* free allocations from this epoch, create a new staple-anchored list from
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86 the remainder */
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87 for (header = oldstaple; header; header = nextheader)
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88 {
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89 nextheader = header->next;
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90 if (header->epoch == epoch) {
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91 if (dofree) {
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92 free(header);
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93 }
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94 } else {
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95 header->prev = NULL;
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96 header->next = NULL;
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97 put_alloc(header);
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98 }
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99 }
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100 }
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101
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102 static void put_alloc(struct dbmalloc_header *header) {
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103 assert(header->next == NULL);
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104 assert(header->prev == NULL);
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105 if (staple) {
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106 staple->prev = header;
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107 }
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108 header->next = staple;
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109 staple = header;
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110 }
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111
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112 static void remove_alloc(struct dbmalloc_header *header) {
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113 if (header->prev) {
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114 header->prev->next = header->next;
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115 }
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116 if (header->next) {
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117 header->next->prev = header->prev;
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118 }
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119 if (staple == header) {
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120 staple = header->next;
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121 }
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122 header->prev = NULL;
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123 header->next = NULL;
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124 }
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125
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126 static struct dbmalloc_header* get_header(void* ptr) {
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127 char* bptr = ptr;
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128 return (struct dbmalloc_header*)&bptr[-sizeof(struct dbmalloc_header)];
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129 }
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130
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131 void * m_malloc(size_t size) {
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132 char* mem = NULL;
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133 struct dbmalloc_header* header = NULL;
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134
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135 if (size == 0 || size > 1e9) {
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136 dropbear_exit("m_malloc failed");
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137 }
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138
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139 size = size + sizeof(struct dbmalloc_header);
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140
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141 mem = calloc(1, size);
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142 if (mem == NULL) {
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143 dropbear_exit("m_malloc failed");
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144 }
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145 header = (struct dbmalloc_header*)mem;
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146 put_alloc(header);
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147 header->epoch = current_epoch;
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148 return &mem[sizeof(struct dbmalloc_header)];
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149 }
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150
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151 void * m_realloc(void* ptr, size_t size) {
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152 char* mem = NULL;
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153 struct dbmalloc_header* header = NULL;
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154 if (size == 0 || size > 1e9) {
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155 dropbear_exit("m_realloc failed");
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156 }
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157
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158 header = get_header(ptr);
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159 remove_alloc(header);
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160
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161 size = size + sizeof(struct dbmalloc_header);
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162 mem = realloc(header, size);
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163 if (mem == NULL) {
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164 dropbear_exit("m_realloc failed");
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165 }
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166
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167 header = (struct dbmalloc_header*)mem;
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168 put_alloc(header);
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169 return &mem[sizeof(struct dbmalloc_header)];
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170 }
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171
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172 void m_free_direct(void* ptr) {
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173 struct dbmalloc_header* header = NULL;
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174 if (!ptr) {
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175 return;
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176 }
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177 header = get_header(ptr);
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178 remove_alloc(header);
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179 free(header);
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180 }
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181
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182 #endif /* DROPBEAR_TRACKING_MALLOC */
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183
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184 void * m_realloc_ltm(void* ptr, size_t oldsize, size_t newsize) {
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185 (void)oldsize;
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186 return m_realloc(ptr, newsize);
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187 }
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188
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189 void m_free_ltm(void *mem, size_t size) {
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190 (void)size;
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191 m_free_direct(mem);
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192 }