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annotate fuzz/fuzz-wrapfd.c @ 1785:9026f976eee8

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fuzz: work around fuzz_connect_remote() limitations
author Matt Johnston <matt@ucc.asn.au>
date Sun, 06 Dec 2020 21:27:25 +0800
parents 97ad26e397a5
children 685b47d8faf7
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 "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 int closein;
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21 int closeout;
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22 };
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23
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24 static struct fdwrap wrap_fds[IOWRAP_MAXFD+1] = {{UNUSED, 0, 0}};
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25 static int wrapfd_maxfd = -1;
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26 static unsigned short rand_state[3];
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27 static buffer *input_buf;
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28 static int devnull_fd = -1;
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29
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30 static void wrapfd_remove(int fd);
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31
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32 void wrapfd_setup(buffer *buf) {
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33 TRACE(("wrapfd_setup"))
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34
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35 // clean old ones
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36 int i;
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37 for (i = 0; i <= wrapfd_maxfd; i++) {
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38 if (wrap_fds[i].mode != UNUSED) {
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39 wrapfd_remove(i);
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40 }
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41 }
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42 wrapfd_maxfd = -1;
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43
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44 memset(rand_state, 0x0, sizeof(rand_state));
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45 wrapfd_setseed(50);
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46 input_buf = buf;
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47 }
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48
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49 void wrapfd_setseed(uint32_t seed) {
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50 memcpy(rand_state, &seed, sizeof(seed));
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51 nrand48(rand_state);
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52 }
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53
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54 int wrapfd_new_fuzzinput() {
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55 if (devnull_fd == -1) {
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56 devnull_fd = open("/dev/null", O_RDONLY);
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57 assert(devnull_fd != -1);
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58 }
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59
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60 int fd = dup(devnull_fd);
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61 assert(fd != -1);
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62 assert(wrap_fds[fd].mode == UNUSED);
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63 wrap_fds[fd].mode = COMMONBUF;
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64 wrap_fds[fd].closein = 0;
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65 wrap_fds[fd].closeout = 0;
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66 wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
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67
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68 return fd;
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69 }
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70
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71 int wrapfd_new_dummy() {
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72 if (devnull_fd == -1) {
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73 devnull_fd = open("/dev/null", O_RDONLY);
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74 assert(devnull_fd != -1);
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75 }
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76
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77 int fd = dup(devnull_fd);
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78 assert(fd != -1);
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79 assert(wrap_fds[fd].mode == UNUSED);
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80 wrap_fds[fd].mode = DUMMY;
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81 wrap_fds[fd].closein = 0;
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82 wrap_fds[fd].closeout = 0;
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83 wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
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84
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85 return fd;
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86 }
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87
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88
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89 static void wrapfd_remove(int fd) {
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90 TRACE(("wrapfd_remove %d", fd))
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91 assert(fd >= 0);
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92 assert(fd <= IOWRAP_MAXFD);
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93 assert(wrap_fds[fd].mode != UNUSED);
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94 wrap_fds[fd].mode = UNUSED;
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95 m_close(fd);
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96 }
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97
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98 int wrapfd_close(int fd) {
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99 if (fd >= 0 && fd <= IOWRAP_MAXFD && wrap_fds[fd].mode != UNUSED) {
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100 wrapfd_remove(fd);
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101 return 0;
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102 } else {
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103 return close(fd);
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104 }
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105 }
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106
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107 int wrapfd_read(int fd, void *out, size_t count) {
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108 size_t maxread;
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109
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110 if (!fuzz.wrapfds) {
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111 return read(fd, out, count);
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112 }
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113
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114 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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115 /* XXX - assertion failure? */
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116 TRACE(("Bad read descriptor %d\n", fd))
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117 errno = EBADF;
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118 return -1;
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119 }
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120
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121 assert(count != 0);
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122
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123 if (wrap_fds[fd].closein || erand48(rand_state) < CHANCE_CLOSE) {
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124 wrap_fds[fd].closein = 1;
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125 errno = ECONNRESET;
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126 return -1;
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127 }
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128
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129 if (erand48(rand_state) < CHANCE_INTR) {
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130 errno = EINTR;
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131 return -1;
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132 }
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133
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134 if (input_buf && wrap_fds[fd].mode == COMMONBUF) {
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135 maxread = MIN(input_buf->len - input_buf->pos, count);
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136 /* returns 0 if buf is EOF, as intended */
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137 if (maxread > 0) {
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138 maxread = nrand48(rand_state) % maxread + 1;
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139 }
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140 memcpy(out, buf_getptr(input_buf, maxread), maxread);
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141 buf_incrpos(input_buf, maxread);
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142 return maxread;
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143 }
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144
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145 // return fixed output, of random length
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146 maxread = MIN(MAX_RANDOM_IN, count);
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147 maxread = nrand48(rand_state) % maxread + 1;
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148 memset(out, 0xef, maxread);
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149 return maxread;
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150 }
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151
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152 int wrapfd_write(int fd, const void* in, size_t count) {
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153 unsigned const volatile char* volin = in;
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154 unsigned int i;
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155
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156 if (!fuzz.wrapfds) {
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157 return write(fd, in, count);
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158 }
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159
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160 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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161 /* XXX - assertion failure? */
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162 TRACE(("Bad read descriptor %d\n", fd))
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163 errno = EBADF;
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164 return -1;
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165 }
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166
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167 assert(count != 0);
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168
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169 /* force read to exercise sanitisers */
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170 for (i = 0; i < count; i++) {
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171 (void)volin[i];
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172 }
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173
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174 if (wrap_fds[fd].closeout || erand48(rand_state) < CHANCE_CLOSE) {
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175 wrap_fds[fd].closeout = 1;
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176 errno = ECONNRESET;
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177 return -1;
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178 }
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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 return nrand48(rand_state) % (count+1);
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186 }
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187
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188 int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
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189 fd_set *exceptfds, struct timeval *timeout) {
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190 int i, nset, sel;
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191 int ret = 0;
1528
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192 int fdlist[IOWRAP_MAXFD+1];
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193
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194 if (!fuzz.wrapfds) {
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195 return select(nfds, readfds, writefds, exceptfds, timeout);
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196 }
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197
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198 assert(nfds <= IOWRAP_MAXFD+1);
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199
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200 if (erand48(rand_state) < CHANCE_INTR) {
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diff changeset
201 errno = EINTR;
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202 return -1;
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203 }
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204
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205 /* read */
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206 if (readfds != NULL && erand48(rand_state) < CHANCE_READ1) {
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207 for (i = 0, nset = 0; i < nfds; i++) {
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parents:
diff changeset
208 if (FD_ISSET(i, readfds)) {
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parents:
diff changeset
209 assert(wrap_fds[i].mode != UNUSED);
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210 fdlist[nset] = i;
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diff changeset
211 nset++;
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212 }
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213 }
1596
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diff changeset
214 DROPBEAR_FD_ZERO(readfds);
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215
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parents:
diff changeset
216 if (nset > 0) {
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diff changeset
217 /* set one */
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218 sel = fdlist[nrand48(rand_state) % nset];
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diff changeset
219 FD_SET(sel, readfds);
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220 ret++;
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diff changeset
221
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222 if (erand48(rand_state) < CHANCE_READ2) {
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diff changeset
223 sel = fdlist[nrand48(rand_state) % nset];
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diff changeset
224 if (!FD_ISSET(sel, readfds)) {
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diff changeset
225 FD_SET(sel, readfds);
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226 ret++;
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parents:
diff changeset
227 }
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parents:
diff changeset
228 }
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parents:
diff changeset
229 }
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parents:
diff changeset
230 }
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diff changeset
231
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diff changeset
232 /* write */
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diff changeset
233 if (writefds != NULL && erand48(rand_state) < CHANCE_WRITE1) {
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parents:
diff changeset
234 for (i = 0, nset = 0; i < nfds; i++) {
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
235 if (FD_ISSET(i, writefds)) {
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
236 assert(wrap_fds[i].mode != UNUSED);
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parents:
diff changeset
237 fdlist[nset] = i;
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diff changeset
238 nset++;
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parents:
diff changeset
239 }
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parents:
diff changeset
240 }
1596
60fceff95858 workaround memory sanitizer FD_ZERO false positives
Matt Johnston <matt@ucc.asn.au>
parents: 1587
diff changeset
241 DROPBEAR_FD_ZERO(writefds);
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parents:
diff changeset
242
1559
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diff changeset
243 /* set one */
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parents:
diff changeset
244 if (nset > 0) {
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diff changeset
245 sel = fdlist[nrand48(rand_state) % nset];
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diff changeset
246 FD_SET(sel, writefds);
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diff changeset
247 ret++;
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parents:
diff changeset
248
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parents:
diff changeset
249 if (erand48(rand_state) < CHANCE_WRITE2) {
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diff changeset
250 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
251 if (!FD_ISSET(sel, writefds)) {
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diff changeset
252 FD_SET(sel, writefds);
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diff changeset
253 ret++;
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parents:
diff changeset
254 }
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parents:
diff changeset
255 }
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parents:
diff changeset
256 }
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parents:
diff changeset
257 }
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
258 return ret;
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
259 }
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diff changeset
260