1 | #ifndef _GNU_SOURCE |
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2 | #define _GNU_SOURCE |
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3 | #endif |
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4 | |
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5 | #include <stdlib.h> |
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6 | #include <stdio.h> |
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7 | #include <limits.h> |
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8 | #include <string.h> |
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9 | |
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10 | #include <malloc.h> |
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11 | #include <execinfo.h> |
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12 | #include <sys/syscall.h> |
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13 | #include <sys/time.h> |
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14 | #include <sys/resource.h> |
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15 | #include <sys/types.h> |
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16 | #include <sys/stat.h> |
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17 | #include <sys/utsname.h> |
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18 | #include <fcntl.h> |
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19 | #include <unistd.h> |
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20 | |
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21 | #include <pthread.h> |
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22 | |
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23 | #include <dlfcn.h> |
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24 | |
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25 | // NOTE: When static linking, this depends on linker wrapping. |
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26 | // Add to your LDFLAGS: |
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27 | // -Wl,--wrap,malloc,--wrap,free,--wrap,realloc,--wrap,calloc,--wrap,memalign /path/to/memlog_s.o -lpthread -ldl |
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28 | |
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29 | FILE *log_file = NULL; |
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30 | static pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER; |
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31 | |
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32 | // The malloc hook might use functions that call malloc, and we need to make |
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33 | // sure this does not cause an infinite loop. |
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34 | static __thread int in_malloc = 0; |
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35 | static char self_path[PATH_MAX+1] = { '\0' }; |
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36 | |
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37 | __attribute__((__constructor__)) |
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38 | static void record_init() { |
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39 | struct utsname u; |
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40 | uname(&u); |
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41 | |
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42 | char log_name[PATH_MAX+1]; |
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43 | snprintf(log_name, PATH_MAX+1, "%s.%d.memlog", u.nodename, getpid()); |
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44 | log_file = fopen(log_name, "w"); |
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45 | if (!log_file) |
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46 | fprintf(stderr, "fopen failed for '%s': %m\n", log_name); |
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47 | |
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48 | const char *link_name = "/proc/self/exe"; |
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49 | readlink(link_name, self_path, PATH_MAX); |
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50 | } |
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51 | |
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52 | __attribute__((__destructor__)) |
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53 | static void record_cleanup() { |
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54 | if (!log_file) |
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55 | return; |
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56 | |
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57 | // These functions might call free, but we're shutting down, so don't try to |
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58 | // unwind the stack from here... |
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59 | in_malloc = 1; |
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60 | |
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61 | (void) fflush(log_file); |
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62 | (void) fclose(log_file); |
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63 | } |
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64 | |
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65 | static void print_context(const void *caller) { |
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66 | struct rusage usage; |
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67 | if (getrusage(RUSAGE_SELF, &usage)) { |
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68 | fprintf(stderr, "getrusage failed: %m\n"); |
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69 | return; |
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70 | } |
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71 | |
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72 | fprintf(log_file, "\t%ld.%06ld %ld %ld", usage.ru_utime.tv_sec, |
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73 | usage.ru_utime.tv_usec, usage.ru_maxrss, syscall(SYS_gettid)); |
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74 | |
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75 | void *pcs[1024]; |
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76 | int num_pcs = backtrace(pcs, 1024); |
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77 | |
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78 | int found_caller = 0; |
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79 | caller = __builtin_extract_return_addr((void*) caller); |
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80 | for (int pci = 0; pci < num_pcs; ++pci) { |
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81 | intptr_t pc = (intptr_t) pcs[pci]; |
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82 | |
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83 | if (!pc) |
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84 | break; |
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85 | |
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86 | if (!found_caller) { |
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87 | if (pc != (intptr_t) caller) |
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88 | continue; |
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89 | |
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90 | found_caller = 1; |
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91 | } |
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92 | |
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93 | intptr_t off, relpc; |
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94 | const char *proc_name; |
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95 | const char *file_name; |
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96 | Dl_info dlinfo; |
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97 | if (dladdr((void *) pc, &dlinfo) && dlinfo.dli_fname && |
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98 | *dlinfo.dli_fname) { |
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99 | intptr_t saddr = (intptr_t) dlinfo.dli_saddr; |
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100 | if (saddr) { |
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101 | #if defined(__powerpc64__) && !defined(__powerpc64le__) |
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102 | // On PPC64 ELFv1, the symbol address points to the function descriptor, not |
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103 | // the actual starting address. |
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104 | saddr = *(intptr_t*) saddr; |
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105 | #endif |
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106 | |
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107 | off = pc - saddr; |
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108 | relpc = pc - ((intptr_t) dlinfo.dli_fbase); |
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109 | } else { |
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110 | off = 0; |
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111 | relpc = 0; |
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112 | } |
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113 | |
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114 | proc_name = dlinfo.dli_sname; |
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115 | if (!proc_name) |
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116 | proc_name = "?"; |
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117 | |
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118 | file_name = dlinfo.dli_fname; |
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119 | } else { |
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120 | // We don't know these... |
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121 | off = 0; |
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122 | relpc = 0; |
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123 | proc_name = "?"; |
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124 | |
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125 | // If we can't determine the file, assume it is the base executable |
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126 | // (which does the right thing for statically-linked binaries). |
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127 | file_name = self_path; |
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128 | } |
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129 | |
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130 | fprintf(log_file, "\t%s (%s+0x%x) [0x%lx (0x%lx)]", file_name, proc_name, (int) off, |
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131 | (long) pc, (long) relpc); |
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132 | } |
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133 | } |
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134 | |
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135 | static void record_malloc(size_t size, void *ptr, const void *caller) { |
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136 | if (!log_file) |
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137 | return; |
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138 | |
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139 | if (pthread_mutex_lock(&log_mutex)) |
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140 | return; |
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141 | |
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142 | fprintf(log_file, "M: %zd %p", size, ptr); |
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143 | print_context(caller); |
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144 | fprintf(log_file, "\n"); |
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145 | |
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146 | done: |
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147 | pthread_mutex_unlock(&log_mutex); |
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148 | } |
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149 | |
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150 | static void record_free(void *ptr, const void *caller) { |
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151 | if (!log_file) |
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152 | return; |
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153 | |
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154 | if (pthread_mutex_lock(&log_mutex)) |
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155 | return; |
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156 | |
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157 | fprintf(log_file, "F: %p", ptr); |
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158 | print_context(caller); |
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159 | fprintf(log_file, "\n"); |
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160 | |
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161 | done: |
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162 | pthread_mutex_unlock(&log_mutex); |
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163 | } |
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164 | |
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165 | // glibc exports its underlying malloc implementation under the name |
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166 | // __libc_malloc so that hooks like this can use it. |
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167 | extern void *__libc_malloc(size_t size); |
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168 | extern void *__libc_realloc(void *ptr, size_t size); |
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169 | extern void *__libc_calloc(size_t nmemb, size_t size); |
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170 | extern void *__libc_memalign(size_t boundary, size_t size); |
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171 | extern void __libc_free(void *ptr); |
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172 | |
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173 | #ifdef __PIC__ |
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174 | #define FUNC(x) x |
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175 | #else |
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176 | #define FUNC(x) __wrap_ ## x |
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177 | #endif |
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178 | |
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179 | void *FUNC(malloc)(size_t size) { |
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180 | const void *caller = __builtin_return_address(0); |
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181 | |
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182 | if (in_malloc) |
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183 | return __libc_malloc(size); |
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184 | |
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185 | in_malloc = 1; |
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186 | |
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187 | void *ptr = __libc_malloc(size); |
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188 | |
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189 | record_malloc(size, ptr, caller); |
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190 | |
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191 | in_malloc = 0; |
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192 | return ptr; |
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193 | } |
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194 | |
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195 | void *FUNC(realloc)(void *ptr, size_t size) { |
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196 | const void *caller = __builtin_return_address(0); |
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197 | |
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198 | if (in_malloc) |
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199 | return __libc_realloc(ptr, size); |
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200 | |
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201 | in_malloc = 1; |
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202 | |
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203 | void *nptr = __libc_realloc(ptr, size); |
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204 | |
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205 | if (ptr) |
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206 | record_free(ptr, caller); |
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207 | record_malloc(size, nptr, caller); |
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208 | |
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209 | in_malloc = 0; |
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210 | |
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211 | return nptr; |
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212 | } |
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213 | |
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214 | void *FUNC(calloc)(size_t nmemb, size_t size) { |
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215 | const void *caller = __builtin_return_address(0); |
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216 | |
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217 | if (in_malloc) |
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218 | return __libc_calloc(nmemb, size); |
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219 | |
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220 | in_malloc = 1; |
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221 | |
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222 | void *ptr = __libc_calloc(nmemb, size); |
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223 | |
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224 | record_malloc(nmemb*size, ptr, caller); |
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225 | |
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226 | in_malloc = 0; |
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227 | |
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228 | return ptr; |
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229 | } |
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230 | |
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231 | void *FUNC(memalign)(size_t boundary, size_t size) { |
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232 | const void *caller = __builtin_return_address(0); |
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233 | |
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234 | if (in_malloc) |
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235 | return __libc_memalign(boundary, size); |
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236 | |
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237 | in_malloc = 1; |
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238 | |
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239 | void *ptr = __libc_memalign(boundary, size); |
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240 | |
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241 | record_malloc(size, ptr, caller); |
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242 | |
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243 | in_malloc = 0; |
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244 | |
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245 | return ptr; |
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246 | } |
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247 | |
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248 | void FUNC(free)(void *ptr) { |
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249 | const void *caller = __builtin_return_address(0); |
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250 | |
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251 | if (in_malloc || !ptr) |
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252 | return __libc_free(ptr); |
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253 | |
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254 | in_malloc = 1; |
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255 | |
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256 | record_free(ptr, caller); |
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257 | |
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258 | __libc_free(ptr); |
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259 | |
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260 | in_malloc = 0; |
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261 | } |
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262 | |
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