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annotate fuzz/fuzz-wrapfd.c @ 1804:f0cd000f3bca

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Prevent multiple shells being spawned Existing shells would be leaked. The old check only caught multiple commands, not shells.
author Matt Johnston <matt@ucc.asn.au>
date Sat, 06 Mar 2021 23:06:43 +0800
parents 19b28d2fbe30
children 1b160ed94749
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 // +100 might catch some limits...
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10 #define IOWRAP_MAXFD (FD_SETSIZE-1 + 100)
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11 static const int MAX_RANDOM_IN = 50000;
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12 static const double CHANCE_CLOSE = 1.0 / 600;
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13 static const double CHANCE_INTR = 1.0 / 900;
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14 static const double CHANCE_READ1 = 0.96;
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15 static const double CHANCE_READ2 = 0.5;
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16 static const double CHANCE_WRITE1 = 0.96;
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17 static const double CHANCE_WRITE2 = 0.5;
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18
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19 struct fdwrap {
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20 enum wrapfd_mode mode;
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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] = {{UNUSED, 0, 0}};
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26 static int wrapfd_maxfd = -1;
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27 static unsigned short rand_state[3];
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28 static buffer *input_buf;
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29 static int devnull_fd = -1;
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30
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31 static void wrapfd_remove(int fd);
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32
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33 void wrapfd_setup(buffer *buf) {
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34 TRACE(("wrapfd_setup"))
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35
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36 // clean old ones
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37 int i;
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38 for (i = 0; i <= wrapfd_maxfd; i++) {
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39 if (wrap_fds[i].mode != UNUSED) {
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40 wrapfd_remove(i);
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41 }
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42 }
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43 wrapfd_maxfd = -1;
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44
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45 memset(rand_state, 0x0, sizeof(rand_state));
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46 wrapfd_setseed(50);
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47 input_buf = buf;
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48 }
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49
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50 void wrapfd_setseed(uint32_t seed) {
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51 memcpy(rand_state, &seed, sizeof(seed));
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52 nrand48(rand_state);
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53 }
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54
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55 int wrapfd_new_fuzzinput() {
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56 if (devnull_fd == -1) {
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57 devnull_fd = open("/dev/null", O_RDONLY);
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58 assert(devnull_fd != -1);
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59 }
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60
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61 int fd = dup(devnull_fd);
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62 assert(fd != -1);
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63 assert(wrap_fds[fd].mode == UNUSED);
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64 wrap_fds[fd].mode = COMMONBUF;
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65 wrap_fds[fd].closein = 0;
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66 wrap_fds[fd].closeout = 0;
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67 wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
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68
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69 return fd;
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70 }
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71
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72 int wrapfd_new_dummy() {
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73 if (devnull_fd == -1) {
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74 devnull_fd = open("/dev/null", O_RDONLY);
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75 assert(devnull_fd != -1);
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76 }
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78 int fd = dup(devnull_fd);
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79 if (fd == -1) {
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80 return -1;
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81 }
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82 if (fd > IOWRAP_MAXFD) {
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83 close(fd);
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84 errno = EMFILE;
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85 return -1;
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86 }
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87 assert(wrap_fds[fd].mode == UNUSED);
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88 wrap_fds[fd].mode = DUMMY;
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89 wrap_fds[fd].closein = 0;
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90 wrap_fds[fd].closeout = 0;
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91 wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
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92
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93 return fd;
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94 }
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95
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96
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97 static void wrapfd_remove(int fd) {
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98 TRACE(("wrapfd_remove %d", fd))
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99 assert(fd >= 0);
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100 assert(fd <= IOWRAP_MAXFD);
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101 assert(wrap_fds[fd].mode != UNUSED);
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102 wrap_fds[fd].mode = UNUSED;
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103 close(fd);
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104 }
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105
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106 int wrapfd_close(int fd) {
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107 if (fd >= 0 && fd <= IOWRAP_MAXFD && wrap_fds[fd].mode != UNUSED) {
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108 wrapfd_remove(fd);
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109 return 0;
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110 } else {
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111 return close(fd);
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112 }
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113 }
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114
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115 int wrapfd_read(int fd, void *out, size_t count) {
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116 size_t maxread;
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117
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118 if (!fuzz.wrapfds) {
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119 return read(fd, out, count);
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120 }
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121
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122 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
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123 /* XXX - assertion failure? */
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124 TRACE(("Bad read descriptor %d\n", fd))
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125 errno = EBADF;
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126 return -1;
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127 }
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128
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129 assert(count != 0);
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130
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131 if (wrap_fds[fd].closein || erand48(rand_state) < CHANCE_CLOSE) {
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132 wrap_fds[fd].closein = 1;
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133 errno = ECONNRESET;
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134 return -1;
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135 }
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136
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137 if (erand48(rand_state) < CHANCE_INTR) {
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138 errno = EINTR;
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139 return -1;
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140 }
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
141
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97ad26e397a5 Add server postauth fuzzer, wrap connect_remote()
Matt Johnston <matt@ucc.asn.au>
parents: 1756
diff changeset
142 if (input_buf && wrap_fds[fd].mode == COMMONBUF) {
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
Matt Johnston <matt@ucc.asn.au>
parents: 1596
diff changeset
143 maxread = MIN(input_buf->len - input_buf->pos, count);
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
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parents: 1528
diff changeset
144 /* returns 0 if buf is EOF, as intended */
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diff changeset
145 if (maxread > 0) {
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
146 maxread = nrand48(rand_state) % maxread + 1;
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
147 }
1740
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
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parents: 1596
diff changeset
148 memcpy(out, buf_getptr(input_buf, maxread), maxread);
dfbe947bdf0d Make wrapfd share a common buffer for all FDs
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parents: 1596
diff changeset
149 buf_incrpos(input_buf, maxread);
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parents:
diff changeset
150 return maxread;
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parents:
diff changeset
151 }
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parents:
diff changeset
152
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parents: 1756
diff changeset
153 // return fixed output, of random length
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parents:
diff changeset
154 maxread = MIN(MAX_RANDOM_IN, count);
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parents:
diff changeset
155 maxread = nrand48(rand_state) % maxread + 1;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 memset(out, 0xef, maxread);
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parents:
diff changeset
157 return maxread;
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parents:
diff changeset
158 }
3677a510f545 add wrapfd. improve fuzzer in makefile
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parents:
diff changeset
159
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
160 int wrapfd_write(int fd, const void* in, size_t count) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
161 unsigned const volatile char* volin = in;
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parents:
diff changeset
162 unsigned int i;
1357
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diff changeset
163
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
164 if (!fuzz.wrapfds) {
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parents: 1356
diff changeset
165 return write(fd, in, count);
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
166 }
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parents: 1356
diff changeset
167
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parents: 1356
diff changeset
168 if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
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parents: 1528
diff changeset
169 /* XXX - assertion failure? */
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parents:
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170 TRACE(("Bad read descriptor %d\n", fd))
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parents:
diff changeset
171 errno = EBADF;
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parents:
diff changeset
172 return -1;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 }
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parents:
diff changeset
174
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parents:
diff changeset
175 assert(count != 0);
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parents:
diff changeset
176
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diff changeset
177 /* force read to exercise sanitisers */
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parents:
diff changeset
178 for (i = 0; i < count; i++) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
179 (void)volin[i];
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parents:
diff changeset
180 }
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parents:
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181
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6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
182 if (wrap_fds[fd].closeout || erand48(rand_state) < CHANCE_CLOSE) {
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
183 wrap_fds[fd].closeout = 1;
6b89eb92f872 glaring wrapfd problems fixed
Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
184 errno = ECONNRESET;
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Matt Johnston <matt@ucc.asn.au>
parents: 1357
diff changeset
185 return -1;
1356
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parents:
diff changeset
186 }
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parents:
diff changeset
187
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
188 if (erand48(rand_state) < CHANCE_INTR) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
189 errno = EINTR;
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parents:
diff changeset
190 return -1;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
191 }
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parents:
diff changeset
192
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
193 return nrand48(rand_state) % (count+1);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
194 }
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parents:
diff changeset
195
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
196 int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
1357
08f4fa4dc6a0 closer to working
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parents: 1356
diff changeset
197 fd_set *exceptfds, struct timeval *timeout) {
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parents: 1356
diff changeset
198 int i, nset, sel;
1356
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parents:
diff changeset
199 int ret = 0;
1528
b9e4fd5a0e72 compile fixes
Matt Johnston <matt@ucc.asn.au>
parents: 1382
diff changeset
200 int fdlist[IOWRAP_MAXFD+1];
b9e4fd5a0e72 compile fixes
Matt Johnston <matt@ucc.asn.au>
parents: 1382
diff changeset
201
1357
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parents: 1356
diff changeset
202 if (!fuzz.wrapfds) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
203 return select(nfds, readfds, writefds, exceptfds, timeout);
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
204 }
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
205
1356
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parents:
diff changeset
206 assert(nfds <= IOWRAP_MAXFD+1);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
207
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
208 if (erand48(rand_state) < CHANCE_INTR) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 errno = EINTR;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
210 return -1;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1528
diff changeset
213 /* read */
1357
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Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
214 if (readfds != NULL && erand48(rand_state) < CHANCE_READ1) {
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
215 for (i = 0, nset = 0; i < nfds; i++) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 if (FD_ISSET(i, readfds)) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 assert(wrap_fds[i].mode != UNUSED);
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 fdlist[nset] = i;
1357
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Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
219 nset++;
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 }
1596
60fceff95858 workaround memory sanitizer FD_ZERO false positives
Matt Johnston <matt@ucc.asn.au>
parents: 1587
diff changeset
222 DROPBEAR_FD_ZERO(readfds);
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 if (nset > 0) {
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1528
diff changeset
225 /* set one */
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
226 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
227 FD_SET(sel, readfds);
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 if (erand48(rand_state) < CHANCE_READ2) {
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
231 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
232 if (!FD_ISSET(sel, readfds)) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
233 FD_SET(sel, readfds);
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1528
diff changeset
240 /* write */
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
241 if (writefds != NULL && erand48(rand_state) < CHANCE_WRITE1) {
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 for (i = 0, nset = 0; i < nfds; i++) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 if (FD_ISSET(i, writefds)) {
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 assert(wrap_fds[i].mode != UNUSED);
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 fdlist[nset] = i;
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
246 nset++;
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 }
1596
60fceff95858 workaround memory sanitizer FD_ZERO false positives
Matt Johnston <matt@ucc.asn.au>
parents: 1587
diff changeset
249 DROPBEAR_FD_ZERO(writefds);
1356
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1528
diff changeset
251 /* set one */
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 if (nset > 0) {
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
253 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
254 FD_SET(sel, writefds);
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257 if (erand48(rand_state) < CHANCE_WRITE2) {
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
258 sel = fdlist[nrand48(rand_state) % nset];
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
259 if (!FD_ISSET(sel, writefds)) {
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
260 FD_SET(sel, writefds);
1356
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261 ret++;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 }
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 return ret;
3677a510f545 add wrapfd. improve fuzzer in makefile
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 }
1357
08f4fa4dc6a0 closer to working
Matt Johnston <matt@ucc.asn.au>
parents: 1356
diff changeset
268
1791
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
269 int fuzz_kill(pid_t pid, int sig) {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
270 if (fuzz.fuzzing) {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
271 TRACE(("fuzz_kill ignoring pid %d signal %d", (pid), sig))
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
272 if (sig >= 0) {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
273 return 0;
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
274 } else {
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
275 errno = EINVAL;
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
276 return -1;
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
277 }
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
278 }
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
279 return kill(pid, sig);
685b47d8faf7 fuzz: wrap kill()
Matt Johnston <matt@ucc.asn.au>
parents: 1777
diff changeset
280 }