lib/asn1/check-common.c

   1 /*
   2  * Copyright (c) 1999 - 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include <config.h>
  38 #endif
  39 #ifdef HAVE_SYS_MMAN_H
  40 #include <sys/mman.h>
  41 #endif
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include <err.h>
  45 #include <roken.h>
  46
  47 #include "asn1-common.h"
  48 #include "check-common.h"
  49
  50 RCSID("$Id$");
  51
  52 struct map_page {
  53     void *start;
  54     size_t size;
  55     void *data_start;
  56     size_t data_size;
  57     enum map_type type;
  58 };
  59
  60 /* #undef HAVE_MMAP */
  61
  62 void *
  63 map_alloc(enum map_type type, const void *buf,
  64           size_t size, struct map_page **map)
  65 {
  66 #ifndef HAVE_MMAP
  67     unsigned char *p;
  68     size_t len = size + sizeof(long) * 2;
  69     int i;
  70
  71     *map = ecalloc(1, sizeof(**map));
  72
  73     p = emalloc(len);
  74     (*map)->type = type;
  75     (*map)->start = p;
  76     (*map)->size = len;
  77     (*map)->data_start = p + sizeof(long);
  78     for (i = sizeof(long); i > 0; i--)
  79         p[sizeof(long) - i] = 0xff - i;
  80     for (i = sizeof(long); i > 0; i--)
  81         p[len - i] = 0xff - i;
  82 #else
  83     unsigned char *p;
  84     int flags, ret, fd;
  85     size_t pagesize = getpagesize();
  86
  87     *map = ecalloc(1, sizeof(**map));
  88
  89     (*map)->type = type;
  90
  91 #ifdef MAP_ANON
  92     flags = MAP_ANON;
  93     fd = -1;
  94 #else
  95     flags = 0;
  96     fd = open ("/dev/zero", O_RDONLY);
  97     if(fd < 0)
  98         err (1, "open /dev/zero");
  99 #endif
 100     flags |= MAP_PRIVATE;
 101
 102     (*map)->size = size + pagesize - (size % pagesize) + pagesize * 2;
 103
 104     p = (unsigned char *)mmap(0, (*map)->size, PROT_READ | PROT_WRITE,
 105                               flags, fd, 0);
 106     if (p == (unsigned char *)MAP_FAILED)
 107         err (1, "mmap");
 108
 109     (*map)->start = p;
 110
 111     ret = mprotect (p, pagesize, 0);
 112     if (ret < 0)
 113         err (1, "mprotect");
 114
 115     ret = mprotect (p + (*map)->size - pagesize, pagesize, 0);
 116     if (ret < 0)
 117         err (1, "mprotect");
 118
 119     switch (type) {
 120     case OVERRUN:
 121         (*map)->data_start = p + (*map)->size - pagesize - size;
 122         break;
 123     case UNDERRUN:
 124         (*map)->data_start = p + pagesize;
 125         break;
 126    default:
 127         abort();
 128     }
 129 #endif
 130     (*map)->data_size = size;
 131     if (buf)
 132         memcpy((*map)->data_start, buf, size);
 133     return (*map)->data_start;
 134 }
 135
 136 void
 137 map_free(struct map_page *map, const char *test_name, const char *map_name)
 138 {
 139 #ifndef HAVE_MMAP
 140     unsigned char *p = map->start;
 141     int i;
 142
 143     for (i = sizeof(long); i > 0; i--)
 144         if (p[sizeof(long) - i] != 0xff - i)
 145             errx(1, "%s: %s underrun %d\n", test_name, map_name, i);
 146     for (i = sizeof(long); i > 0; i--)
 147         if (p[map->size - i] != 0xff - i)
 148             errx(1, "%s: %s overrun %lu\n", test_name, map_name,
 149                  (unsigned long)map->size - i);
 150     free(map->start);
 151 #else
 152     int ret;
 153
 154     ret = munmap (map->start, map->size);
 155     if (ret < 0)
 156         err (1, "munmap");
 157 #endif
 158     free(map);
 159 }
 160
 161 static void
 162 print_bytes (unsigned const char *buf, size_t len)
 163 {
 164     int i;
 165
 166     for (i = 0; i < len; ++i)
 167         printf ("%02x ", buf[i]);
 168 }
 169
 170 #ifndef MAP_FAILED
 171 #define MAP_FAILED (-1)
 172 #endif
 173
 174 static char *current_test = "<uninit>";
 175 static char *current_state = "<uninit>";
 176
 177 static RETSIGTYPE
 178 segv_handler(int sig)
 179 {
 180     int fd;
 181     char msg[] = "SIGSEGV i current test: ";
 182
 183     fd = open("/dev/stdout", O_WRONLY, 0600);
 184     if (fd >= 0) {
 185         write(fd, msg, sizeof(msg));
 186         write(fd, current_test, strlen(current_test));
 187         write(fd, " ", 1);
 188         write(fd, current_state, strlen(current_state));
 189         write(fd, "\n", 1);
 190         close(fd);
 191     }
 192     _exit(1);
 193 }
 194
 195 int
 196 generic_test (const struct test_case *tests,
 197               unsigned ntests,
 198               size_t data_size,
 199               int (ASN1CALL *encode)(unsigned char *, size_t, void *, size_t *),
 200               int (ASN1CALL *length)(void *),
 201               int (ASN1CALL *decode)(unsigned char *, size_t, void *, size_t *),
 202               int (ASN1CALL *free_data)(void *),
 203               int (*cmp)(void *a, void *b),
 204               int (ASN1CALL *copy)(const void *from, void *to))
 205 {
 206     unsigned char *buf, *buf2;
 207     int i;
 208     int failures = 0;
 209     void *data;
 210     struct map_page *data_map, *buf_map, *buf2_map;
 211
 212 #ifdef HAVE_SIGACTION
 213     struct sigaction sa, osa;
 214 #endif
 215
 216     for (i = 0; i < ntests; ++i) {
 217         int ret;
 218         size_t sz, consumed_sz, length_sz, buf_sz;
 219         void *to = NULL;
 220
 221         current_test = tests[i].name;
 222
 223         current_state = "init";
 224
 225 #ifdef HAVE_SIGACTION
 226         sigemptyset (&sa.sa_mask);
 227         sa.sa_flags = 0;
 228 #ifdef SA_RESETHAND
 229         sa.sa_flags |= SA_RESETHAND;
 230 #endif
 231         sa.sa_handler = segv_handler;
 232         sigaction (SIGSEGV, &sa, &osa);
 233 #endif
 234
 235         data = map_alloc(OVERRUN, NULL, data_size, &data_map);
 236
 237         buf_sz = tests[i].byte_len;
 238         buf = map_alloc(UNDERRUN, NULL, buf_sz, &buf_map);
 239
 240         current_state = "encode";
 241         ret = (*encode) (buf + buf_sz - 1, buf_sz,
 242                          tests[i].val, &sz);
 243         if (ret != 0) {
 244             printf ("encoding of %s failed %d\n", tests[i].name, ret);
 245             ++failures;
 246             continue;
 247         }
 248         if (sz != tests[i].byte_len) {
 249             printf ("encoding of %s has wrong len (%lu != %lu)\n",
 250                     tests[i].name,
 251                     (unsigned long)sz, (unsigned long)tests[i].byte_len);
 252             ++failures;
 253             continue;
 254         }
 255
 256         current_state = "length";
 257         length_sz = (*length) (tests[i].val);
 258         if (sz != length_sz) {
 259             printf ("length for %s is bad (%lu != %lu)\n",
 260                     tests[i].name, (unsigned long)length_sz, (unsigned long)sz);
 261             ++failures;
 262             continue;
 263         }
 264
 265         current_state = "memcmp";
 266         if (memcmp (buf, tests[i].bytes, tests[i].byte_len) != 0) {
 267             printf ("encoding of %s has bad bytes:\n"
 268                     "correct: ", tests[i].name);
 269             print_bytes ((unsigned char *)tests[i].bytes, tests[i].byte_len);
 270             printf ("\nactual:  ");
 271             print_bytes (buf, sz);
 272             printf ("\n");
 273 #if 0
 274             rk_dumpdata("correct", tests[i].bytes, tests[i].byte_len);
 275             rk_dumpdata("actual", buf, sz);
 276             exit (1);
 277 #endif
 278             ++failures;
 279             continue;
 280         }
 281
 282         buf2 = map_alloc(OVERRUN, buf, sz, &buf2_map);
 283
 284         current_state = "decode";
 285         ret = (*decode) (buf2, sz, data, &consumed_sz);
 286         if (ret != 0) {
 287             printf ("decoding of %s failed %d\n", tests[i].name, ret);
 288             ++failures;
 289             continue;
 290         }
 291         if (sz != consumed_sz) {
 292             printf ("different length decoding %s (%ld != %ld)\n",
 293                     tests[i].name,
 294                     (unsigned long)sz, (unsigned long)consumed_sz);
 295             ++failures;
 296             continue;
 297         }
 298         current_state = "cmp";
 299         if ((*cmp)(data, tests[i].val) != 0) {
 300             printf ("%s: comparison failed\n", tests[i].name);
 301             ++failures;
 302             continue;
 303         }
 304
 305         current_state = "copy";
 306         if (copy) {
 307             to = emalloc(data_size);
 308             ret = (*copy)(data, to);
 309             if (ret != 0) {
 310                 printf ("copy of %s failed %d\n", tests[i].name, ret);
 311                 ++failures;
 312                 continue;
 313             }
 314
 315             current_state = "cmp-copy";
 316             if ((*cmp)(data, to) != 0) {
 317                 printf ("%s: copy comparison failed\n", tests[i].name);
 318                 ++failures;
 319                 continue;
 320             }
 321         }
 322
 323         current_state = "free";
 324         if (free_data) {
 325             (*free_data)(data);
 326             if (to) {
 327                 (*free_data)(to);
 328                 free(to);
 329             }
 330         }
 331
 332         current_state = "free";
 333         map_free(buf_map, tests[i].name, "encode");
 334         map_free(buf2_map, tests[i].name, "decode");
 335         map_free(data_map, tests[i].name, "data");
 336
 337 #ifdef HAVE_SIGACTION
 338         sigaction (SIGSEGV, &osa, NULL);
 339 #endif
 340     }
 341     current_state = "done";
 342     return failures;
 343 }
 344
 345 /*
 346  * check for failures
 347  *
 348  * a test size (byte_len) of -1 means that the test tries to trigger a
 349  * integer overflow (and later a malloc of to little memory), just
 350  * allocate some memory and hope that is enough for that test.
 351  */
 352
 353 int
 354 generic_decode_fail (const struct test_case *tests,
 355                      unsigned ntests,
 356                      size_t data_size,
 357                      int (ASN1CALL *decode)(unsigned char *, size_t, void *, size_t *))
 358 {
 359     unsigned char *buf;
 360     int i;
 361     int failures = 0;
 362     void *data;
 363     struct map_page *data_map, *buf_map;
 364
 365 #ifdef HAVE_SIGACTION
 366     struct sigaction sa, osa;
 367 #endif
 368
 369     for (i = 0; i < ntests; ++i) {
 370         int ret;
 371         size_t sz;
 372         const void *bytes;
 373
 374         current_test = tests[i].name;
 375
 376         current_state = "init";
 377
 378 #ifdef HAVE_SIGACTION
 379         sigemptyset (&sa.sa_mask);
 380         sa.sa_flags = 0;
 381 #ifdef SA_RESETHAND
 382         sa.sa_flags |= SA_RESETHAND;
 383 #endif
 384         sa.sa_handler = segv_handler;
 385         sigaction (SIGSEGV, &sa, &osa);
 386 #endif
 387
 388         data = map_alloc(OVERRUN, NULL, data_size, &data_map);
 389
 390         if (tests[i].byte_len < 0xffffff && tests[i].byte_len >= 0) {
 391             sz = tests[i].byte_len;
 392             bytes = tests[i].bytes;
 393         } else {
 394             sz = 4096;
 395             bytes = NULL;
 396         }
 397
 398         buf = map_alloc(OVERRUN, bytes, sz, &buf_map);
 399
 400         if (tests[i].byte_len == -1)
 401             memset(buf, 0, sz);
 402
 403         current_state = "decode";
 404         ret = (*decode) (buf, tests[i].byte_len, data, &sz);
 405         if (ret == 0) {
 406             printf ("sucessfully decoded %s\n", tests[i].name);
 407             ++failures;
 408             continue;
 409         }
 410
 411         current_state = "free";
 412         if (buf)
 413             map_free(buf_map, tests[i].name, "encode");
 414         map_free(data_map, tests[i].name, "data");
 415
 416 #ifdef HAVE_SIGACTION
 417         sigaction (SIGSEGV, &osa, NULL);
 418 #endif
 419     }
 420     current_state = "done";
 421     return failures;
 422 }