Mercurial > dropbear

annotate fuzz-wrapfd.c @ 1634:aabde6f57fce

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Add a sanity check for DROPBEAR_SVR_MULTIUSER==0 mode
author Matt Johnston <matt@ucc.asn.au>
date Wed, 20 Mar 2019 22:57:06 +0800
parents 60fceff95858
children dfbe947bdf0d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 "dbutil.h"
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6
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7 #include "fuzz.h"
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8
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9 #define IOWRAP_MAXFD (FD_SETSIZE-1)
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10 static const int MAX_RANDOM_IN = 50000;
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11 static const double CHANCE_CLOSE = 1.0 / 600;
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12 static const double CHANCE_INTR = 1.0 / 900;
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13 static const double CHANCE_READ1 = 0.96;
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14 static const double CHANCE_READ2 = 0.5;
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15 static const double CHANCE_WRITE1 = 0.96;
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16 static const double CHANCE_WRITE2 = 0.5;
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17
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18 struct fdwrap {
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19 enum wrapfd_mode mode;
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20 buffer *buf;
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21 int closein;
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22 int closeout;
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23 };
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24
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25 static struct fdwrap wrap_fds[IOWRAP_MAXFD+1];
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26 /* for quick selection of in-use descriptors */
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27 static int wrap_used[IOWRAP_MAXFD+1];
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28 static unsigned int nused;
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29 static unsigned short rand_state[3];
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30
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31 void wrapfd_setup(void) {
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32 TRACE(("wrapfd_setup"))
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33 nused = 0;
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34 memset(wrap_fds, 0x0, sizeof(wrap_fds));
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35 memset(wrap_used, 0x0, sizeof(wrap_used));
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36
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37 memset(rand_state, 0x0, sizeof(rand_state));
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38 wrapfd_setseed(50);
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39 }
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40
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41 void wrapfd_setseed(uint32_t seed) {
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42 memcpy(rand_state, &seed, sizeof(seed));
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43 nrand48(rand_state);
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44 }
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45
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46 void wrapfd_add(int fd, buffer *buf, enum wrapfd_mode mode) {
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47 TRACE(("wrapfd_add %d buf %p mode %d", fd, buf, mode))
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48 assert(fd >= 0);
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49 assert(fd <= IOWRAP_MAXFD);
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50 assert(wrap_fds[fd].mode == UNUSED);
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51 assert(buf || mode == RANDOMIN);
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52
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53 wrap_fds[fd].mode = mode;
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54 wrap_fds[fd].buf = buf;
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55 wrap_fds[fd].closein = 0;
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56 wrap_fds[fd].closeout = 0;
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57 wrap_used[nused] = fd;
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58
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59 nused++;
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60 }
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61
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62 void wrapfd_remove(int fd) {
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63 unsigned int i, j;
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64 TRACE(("wrapfd_remove %d", fd))
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65 assert(fd >= 0);
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66 assert(fd <= IOWRAP_MAXFD);
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67 assert(wrap_fds[fd].mode != UNUSED);
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68 wrap_fds[fd].mode = UNUSED;
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69
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70
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71 /* remove from used list */
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72 for (i = 0, j = 0; i < nused; i++) {
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73 if (wrap_used[i] != fd) {
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74 wrap_used[j] = wrap_used[i];
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75 j++;
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76 }
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77 }
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78 nused--;
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79 }
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80
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81 int wrapfd_close(int fd) {
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82 if (fd >= 0 && fd <= IOWRAP_MAXFD && wrap_fds[fd].mode != UNUSED) {
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83 wrapfd_remove(fd);
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84 return 0;
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85 } else {
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86 return close(fd);
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87 }
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88 }
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89
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90 int wrapfd_read(int fd, void *out, size_t count) {
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91 size_t maxread;
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92 buffer *buf;
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93
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94 if (!fuzz.wrapfds) {
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95 return read(fd, out, count);
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96 }
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97
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98 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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99 /* XXX - assertion failure? */
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100 TRACE(("Bad read descriptor %d\n", fd))
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101 errno = EBADF;
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102 return -1;
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103 }
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104
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105 assert(count != 0);
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106
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107 if (wrap_fds[fd].closein || erand48(rand_state) < CHANCE_CLOSE) {
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108 wrap_fds[fd].closein = 1;
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109 errno = ECONNRESET;
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110 return -1;
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111 }
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112
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113 if (erand48(rand_state) < CHANCE_INTR) {
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114 errno = EINTR;
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115 return -1;
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116 }
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117
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118 buf = wrap_fds[fd].buf;
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119 if (buf) {
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120 maxread = MIN(buf->len - buf->pos, count);
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121 /* returns 0 if buf is EOF, as intended */
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122 if (maxread > 0) {
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123 maxread = nrand48(rand_state) % maxread + 1;
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124 }
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125 memcpy(out, buf_getptr(buf, maxread), maxread);
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126 buf_incrpos(buf, maxread);
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127 return maxread;
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128 }
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129
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130 maxread = MIN(MAX_RANDOM_IN, count);
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131 maxread = nrand48(rand_state) % maxread + 1;
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132 memset(out, 0xef, maxread);
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133 return maxread;
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134 }
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135
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136 int wrapfd_write(int fd, const void* in, size_t count) {
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137 unsigned const volatile char* volin = in;
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138 unsigned int i;
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139
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140 if (!fuzz.wrapfds) {
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141 return write(fd, in, count);
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142 }
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143
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144 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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145 /* XXX - assertion failure? */
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146 TRACE(("Bad read descriptor %d\n", fd))
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147 errno = EBADF;
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148 return -1;
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149 }
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150
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151 assert(count != 0);
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152
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153 /* force read to exercise sanitisers */
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154 for (i = 0; i < count; i++) {
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155 (void)volin[i];
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156 }
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157
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158 if (wrap_fds[fd].closeout || erand48(rand_state) < CHANCE_CLOSE) {
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159 wrap_fds[fd].closeout = 1;
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160 errno = ECONNRESET;
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161 return -1;
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162 }
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163
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164 if (erand48(rand_state) < CHANCE_INTR) {
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165 errno = EINTR;
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166 return -1;
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167 }
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168
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169 return nrand48(rand_state) % (count+1);
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170 }
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171
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172 int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
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173 fd_set *exceptfds, struct timeval *timeout) {
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174 int i, nset, sel;
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175 int ret = 0;
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176 int fdlist[IOWRAP_MAXFD+1];
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177
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178 memset(fdlist, 0x0, sizeof(fdlist));
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179
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180 if (!fuzz.wrapfds) {
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181 return select(nfds, readfds, writefds, exceptfds, timeout);
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182 }
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183
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184 assert(nfds <= IOWRAP_MAXFD+1);
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185
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186 if (erand48(rand_state) < CHANCE_INTR) {
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187 errno = EINTR;
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188 return -1;
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189 }
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190
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191 /* read */
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192 if (readfds != NULL && erand48(rand_state) < CHANCE_READ1) {
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193 for (i = 0, nset = 0; i < nfds; i++) {
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194 if (FD_ISSET(i, readfds)) {
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195 assert(wrap_fds[i].mode != UNUSED);
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196 fdlist[nset] = i;
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197 nset++;
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198 }
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199 }
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200 DROPBEAR_FD_ZERO(readfds);
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201
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202 if (nset > 0) {
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203 /* set one */
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204 sel = fdlist[nrand48(rand_state) % nset];
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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 if (erand48(rand_state) < CHANCE_READ2) {
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209 sel = fdlist[nrand48(rand_state) % nset];
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210 if (!FD_ISSET(sel, readfds)) {
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211 FD_SET(sel, readfds);
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212 ret++;
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213 }
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214 }
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215 }
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216 }
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217
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218 /* write */
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219 if (writefds != NULL && erand48(rand_state) < CHANCE_WRITE1) {
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220 for (i = 0, nset = 0; i < nfds; i++) {
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221 if (FD_ISSET(i, writefds)) {
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222 assert(wrap_fds[i].mode != UNUSED);
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223 fdlist[nset] = i;
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224 nset++;
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225 }
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226 }
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227 DROPBEAR_FD_ZERO(writefds);
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228
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229 /* set one */
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230 if (nset > 0) {
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231 sel = fdlist[nrand48(rand_state) % nset];
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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 if (erand48(rand_state) < CHANCE_WRITE2) {
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236 sel = fdlist[nrand48(rand_state) % nset];
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237 if (!FD_ISSET(sel, writefds)) {
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238 FD_SET(sel, writefds);
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239 ret++;
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240 }
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241 }
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242 }
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parents:
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243 }
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244 return ret;
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245 }
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246