Mercurial > dropbear

annotate fuzz-wrapfd.c @ 1590:68d5d8e84a92

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notes on the fuzzer
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Mar 2018 14:07:11 +0800
parents b579ec254988
children 60fceff95858
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #define 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 / 600;
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10 static const double CHANCE_INTR = 1.0 / 900;
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11 static const double CHANCE_READ1 = 0.96;
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12 static const double CHANCE_READ2 = 0.5;
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13 static const double CHANCE_WRITE1 = 0.96;
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14 static const double CHANCE_WRITE2 = 0.5;
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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(void) {
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30 TRACE(("wrapfd_setup"))
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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 wrapfd_setseed(50);
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37 }
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38
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39 void wrapfd_setseed(uint32_t seed) {
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40 memcpy(rand_state, &seed, sizeof(seed));
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41 nrand48(rand_state);
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42 }
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43
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44 void wrapfd_add(int fd, buffer *buf, enum wrapfd_mode mode) {
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45 TRACE(("wrapfd_add %d buf %p mode %d", fd, buf, mode))
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46 assert(fd >= 0);
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47 assert(fd <= IOWRAP_MAXFD);
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48 assert(wrap_fds[fd].mode == UNUSED);
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49 assert(buf || mode == RANDOMIN);
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50
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51 wrap_fds[fd].mode = mode;
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52 wrap_fds[fd].buf = buf;
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53 wrap_fds[fd].closein = 0;
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54 wrap_fds[fd].closeout = 0;
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55 wrap_used[nused] = fd;
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57 nused++;
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58 }
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59
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60 void wrapfd_remove(int fd) {
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61 unsigned int i, j;
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62 TRACE(("wrapfd_remove %d", fd))
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63 assert(fd >= 0);
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64 assert(fd <= IOWRAP_MAXFD);
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65 assert(wrap_fds[fd].mode != UNUSED);
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66 wrap_fds[fd].mode = UNUSED;
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67
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68
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69 /* remove from used list */
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70 for (i = 0, j = 0; i < nused; i++) {
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71 if (wrap_used[i] != fd) {
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72 wrap_used[j] = wrap_used[i];
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73 j++;
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74 }
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75 }
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76 nused--;
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77 }
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78
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79 int wrapfd_close(int fd) {
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80 if (fd >= 0 && fd <= IOWRAP_MAXFD && wrap_fds[fd].mode != UNUSED) {
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81 wrapfd_remove(fd);
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82 return 0;
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83 } else {
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84 return close(fd);
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85 }
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86 }
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87
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88 int wrapfd_read(int fd, void *out, size_t count) {
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89 size_t maxread;
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90 buffer *buf;
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91
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92 if (!fuzz.wrapfds) {
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93 return read(fd, out, count);
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94 }
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95
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96 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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97 /* XXX - assertion failure? */
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98 TRACE(("Bad read descriptor %d\n", fd))
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99 errno = EBADF;
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100 return -1;
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101 }
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102
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103 assert(count != 0);
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104
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105 if (wrap_fds[fd].closein || erand48(rand_state) < CHANCE_CLOSE) {
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106 wrap_fds[fd].closein = 1;
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107 errno = ECONNRESET;
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108 return -1;
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109 }
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110
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111 if (erand48(rand_state) < CHANCE_INTR) {
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112 errno = EINTR;
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113 return -1;
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114 }
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115
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116 buf = wrap_fds[fd].buf;
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117 if (buf) {
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118 maxread = MIN(buf->len - buf->pos, count);
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119 /* returns 0 if buf is EOF, as intended */
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120 if (maxread > 0) {
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121 maxread = nrand48(rand_state) % maxread + 1;
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122 }
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123 memcpy(out, buf_getptr(buf, maxread), maxread);
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124 buf_incrpos(buf, maxread);
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125 return maxread;
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126 }
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127
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128 maxread = MIN(MAX_RANDOM_IN, count);
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129 maxread = nrand48(rand_state) % maxread + 1;
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130 memset(out, 0xef, maxread);
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131 return maxread;
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132 }
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133
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134 int wrapfd_write(int fd, const void* in, size_t count) {
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135 unsigned const volatile char* volin = in;
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136 unsigned int i;
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137
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138 if (!fuzz.wrapfds) {
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139 return write(fd, in, count);
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140 }
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141
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142 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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143 /* XXX - assertion failure? */
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144 TRACE(("Bad read descriptor %d\n", fd))
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145 errno = EBADF;
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146 return -1;
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147 }
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148
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149 assert(count != 0);
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150
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151 /* force read to exercise sanitisers */
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152 for (i = 0; i < count; i++) {
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153 (void)volin[i];
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154 }
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155
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156 if (wrap_fds[fd].closeout || erand48(rand_state) < CHANCE_CLOSE) {
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157 wrap_fds[fd].closeout = 1;
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158 errno = ECONNRESET;
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159 return -1;
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160 }
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161
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162 if (erand48(rand_state) < CHANCE_INTR) {
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163 errno = EINTR;
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164 return -1;
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165 }
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166
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167 return nrand48(rand_state) % (count+1);
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168 }
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169
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170 int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
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171 fd_set *exceptfds, struct timeval *timeout) {
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172 int i, nset, sel;
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173 int ret = 0;
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174 int fdlist[IOWRAP_MAXFD+1];
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175
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176 memset(fdlist, 0x0, sizeof(fdlist));
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177
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178 if (!fuzz.wrapfds) {
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179 return select(nfds, readfds, writefds, exceptfds, timeout);
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180 }
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181
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182 assert(nfds <= IOWRAP_MAXFD+1);
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183
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184 if (erand48(rand_state) < CHANCE_INTR) {
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185 errno = EINTR;
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186 return -1;
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187 }
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188
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189 /* read */
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190 if (readfds != NULL && erand48(rand_state) < CHANCE_READ1) {
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191 for (i = 0, nset = 0; i < nfds; i++) {
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192 if (FD_ISSET(i, readfds)) {
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193 assert(wrap_fds[i].mode != UNUSED);
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194 fdlist[nset] = i;
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195 nset++;
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196 }
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197 }
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198 FD_ZERO(readfds);
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199
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200 if (nset > 0) {
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201 /* set one */
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202 sel = fdlist[nrand48(rand_state) % nset];
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203 FD_SET(sel, readfds);
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204 ret++;
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205
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206 if (erand48(rand_state) < CHANCE_READ2) {
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207 sel = fdlist[nrand48(rand_state) % nset];
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208 if (!FD_ISSET(sel, readfds)) {
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209 FD_SET(sel, readfds);
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210 ret++;
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211 }
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212 }
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213 }
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214 }
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215
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216 /* write */
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217 if (writefds != NULL && erand48(rand_state) < CHANCE_WRITE1) {
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218 for (i = 0, nset = 0; i < nfds; i++) {
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219 if (FD_ISSET(i, writefds)) {
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220 assert(wrap_fds[i].mode != UNUSED);
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221 fdlist[nset] = i;
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222 nset++;
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223 }
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224 }
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225 FD_ZERO(writefds);
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226
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227 /* set one */
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228 if (nset > 0) {
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229 sel = fdlist[nrand48(rand_state) % nset];
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230 FD_SET(sel, writefds);
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231 ret++;
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232
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233 if (erand48(rand_state) < CHANCE_WRITE2) {
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234 sel = fdlist[nrand48(rand_state) % nset];
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diff changeset
235 if (!FD_ISSET(sel, writefds)) {
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236 FD_SET(sel, writefds);
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237 ret++;
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238 }
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parents:
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239 }
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240 }
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parents:
diff changeset
241 }
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parents:
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242 return ret;
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parents:
diff changeset
243 }
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244