annotate fuzz-wrapfd.c @ 1360:16f45f2df38f fuzz

ignore wrapfd_close for unknown
author Matt Johnston <matt@ucc.asn.au>
date Sun, 21 May 2017 10:48:18 +0800
parents 6b89eb92f872
children d4cc85e6c569
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1 #define FUZZ_SKIP_WRAP 1
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2 #include "includes.h"
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3 #include "fuzz-wrapfd.h"
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4
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5 #include "fuzz.h"
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6
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7 static const int IOWRAP_MAXFD = FD_SETSIZE-1;
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8 static const int MAX_RANDOM_IN = 50000;
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9 static const double CHANCE_CLOSE = 1.0 / 300;
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10 static const double CHANCE_INTR = 1.0 / 200;
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11 static const double CHANCE_READ1 = 0.6;
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12 static const double CHANCE_READ2 = 0.3;
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13 static const double CHANCE_WRITE1 = 0.8;
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14 static const double CHANCE_WRITE2 = 0.3;
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15
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16 struct fdwrap {
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17 enum wrapfd_mode mode;
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18 buffer *buf;
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19 int closein;
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20 int closeout;
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21 };
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22
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23 static struct fdwrap wrap_fds[IOWRAP_MAXFD+1];
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24 // for quick selection of in-use descriptors
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25 static int wrap_used[IOWRAP_MAXFD+1];
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26 static unsigned int nused;
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27 static unsigned short rand_state[3];
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28
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29 void wrapfd_setup(uint32_t seed) {
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30 TRACE(("wrapfd_setup %x", seed))
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31 nused = 0;
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32 memset(wrap_fds, 0x0, sizeof(wrap_fds));
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33 memset(wrap_used, 0x0, sizeof(wrap_used));
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34
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35 memset(rand_state, 0x0, sizeof(rand_state));
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36 *((uint32_t*)rand_state) = seed;
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37 nrand48(rand_state);
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38 }
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39
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40 void wrapfd_add(int fd, buffer *buf, enum wrapfd_mode mode) {
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41 TRACE(("wrapfd_add %d buf %p mode %d", fd, buf, mode))
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42 assert(fd >= 0);
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43 assert(fd <= IOWRAP_MAXFD);
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44 assert(wrap_fds[fd].mode == UNUSED);
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45 assert(buf || mode == RANDOMIN);
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46
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47 wrap_fds[fd].mode = mode;
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48 wrap_fds[fd].buf = buf;
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49 wrap_fds[fd].closein = 0;
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50 wrap_fds[fd].closeout = 0;
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51 wrap_used[nused] = fd;
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52
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53 nused++;
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54 }
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55
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56 void wrapfd_remove(int fd) {
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57 unsigned int i, j;
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58 TRACE(("wrapfd_remove %d", fd))
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59 assert(fd >= 0);
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60 assert(fd <= IOWRAP_MAXFD);
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61 assert(wrap_fds[fd].mode != UNUSED);
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62 wrap_fds[fd].mode = UNUSED;
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63
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64
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65 // remove from used list
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66 for (i = 0, j = 0; i < nused; i++) {
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67 if (wrap_used[i] != fd) {
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68 wrap_used[j] = wrap_used[i];
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69 j++;
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70 }
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71 }
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72 nused--;
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73 }
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74
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75 int wrapfd_close(int fd) {
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76 if (fd >= 0 && fd <= IOWRAP_MAXFD && wrap_fds[fd].mode != UNUSED)
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77 {
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78 wrapfd_remove(fd);
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79 return 0;
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80 }
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81 else {
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82 return close(fd);
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83 }
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84 }
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85
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86 int wrapfd_read(int fd, void *out, size_t count) {
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87 size_t maxread;
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88 buffer *buf;
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89
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90 if (!fuzz.wrapfds) {
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91 return read(fd, out, count);
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92 }
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93
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94 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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95 // XXX - assertion failure?
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96 TRACE(("Bad read descriptor %d\n", fd))
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97 errno = EBADF;
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98 return -1;
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99 }
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100
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101 assert(count != 0);
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102
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103 if (wrap_fds[fd].closein || erand48(rand_state) < CHANCE_CLOSE) {
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104 wrap_fds[fd].closein = 1;
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105 errno = ECONNRESET;
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106 return -1;
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107 }
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108
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109 if (erand48(rand_state) < CHANCE_INTR) {
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110 errno = EINTR;
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111 return -1;
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112 }
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113
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114 buf = wrap_fds[fd].buf;
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115 if (buf) {
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116 maxread = MIN(buf->len - buf->pos, count);
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117 // returns 0 if buf is EOF, as intended
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118 if (maxread > 0) {
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119 maxread = nrand48(rand_state) % maxread + 1;
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120 }
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121 memcpy(out, buf_getptr(buf, maxread), maxread);
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122 buf_incrpos(buf, maxread);
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123 return maxread;
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124 }
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125
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126 maxread = MIN(MAX_RANDOM_IN, count);
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127 maxread = nrand48(rand_state) % maxread + 1;
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128 memset(out, 0xef, maxread);
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129 return maxread;
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130 }
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131
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132 int wrapfd_write(int fd, const void* in, size_t count) {
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133 unsigned const volatile char* volin = in;
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134 unsigned int i;
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135
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136 if (!fuzz.wrapfds) {
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137 return write(fd, in, count);
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138 }
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139
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140 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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141 // XXX - assertion failure?
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142 TRACE(("Bad read descriptor %d\n", fd))
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143 errno = EBADF;
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144 return -1;
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145 }
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146
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147 assert(count != 0);
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148
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149 // force read to exercise sanitisers
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150 for (i = 0; i < count; i++) {
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151 (void)volin[i];
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152 }
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153
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154 if (wrap_fds[fd].closeout || erand48(rand_state) < CHANCE_CLOSE) {
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155 wrap_fds[fd].closeout = 1;
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156 errno = ECONNRESET;
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157 return -1;
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158 }
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159
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160 if (erand48(rand_state) < CHANCE_INTR) {
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161 errno = EINTR;
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162 return -1;
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163 }
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164
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165 return nrand48(rand_state) % (count+1);
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166 }
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167
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168 int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
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169 fd_set *exceptfds, struct timeval *timeout) {
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170 int i, nset, sel;
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171 int ret = 0;
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172 int fdlist[IOWRAP_MAXFD+1] = {0};
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173
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174 if (!fuzz.wrapfds) {
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175 return select(nfds, readfds, writefds, exceptfds, timeout);
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176 }
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177
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178 assert(nfds <= IOWRAP_MAXFD+1);
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179
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180 if (erand48(rand_state) < CHANCE_INTR) {
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181 errno = EINTR;
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182 return -1;
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183 }
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184
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185 // read
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186 if (readfds != NULL && erand48(rand_state) < CHANCE_READ1) {
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187 for (i = 0, nset = 0; i < nfds; i++) {
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188 if (FD_ISSET(i, readfds)) {
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189 assert(wrap_fds[i].mode != UNUSED);
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190 fdlist[nset] = i;
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191 nset++;
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192 }
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193 }
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194 FD_ZERO(readfds);
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195
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196 if (nset > 0) {
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197 // set one
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198 sel = fdlist[nrand48(rand_state) % nset];
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199 FD_SET(sel, readfds);
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200 ret++;
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201
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202 if (erand48(rand_state) < CHANCE_READ2) {
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203 sel = fdlist[nrand48(rand_state) % nset];
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204 if (!FD_ISSET(sel, readfds)) {
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205 FD_SET(sel, readfds);
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206 ret++;
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207 }
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208 }
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209 }
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210 }
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211
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212 // write
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213 if (writefds != NULL && erand48(rand_state) < CHANCE_WRITE1) {
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214 for (i = 0, nset = 0; i < nfds; i++) {
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215 if (FD_ISSET(i, writefds)) {
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216 assert(wrap_fds[i].mode != UNUSED);
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217 fdlist[nset] = i;
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218 nset++;
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219 }
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220 }
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221 FD_ZERO(writefds);
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222
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223 // set one
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224 if (nset > 0) {
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225 sel = fdlist[nrand48(rand_state) % nset];
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226 FD_SET(sel, writefds);
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227 ret++;
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228
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229 if (erand48(rand_state) < CHANCE_WRITE2) {
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230 sel = fdlist[nrand48(rand_state) % nset];
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231 if (!FD_ISSET(sel, writefds)) {
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232 FD_SET(sel, writefds);
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233 ret++;
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234 }
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235 }
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236 }
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237 }
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238 return ret;
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239 }
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240