debug/test-strcpy_chk.c

   1 /* Test and measure __strcpy_chk functions.
   2    Copyright (C) 1999-2013 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef STRCPY_RESULT
  21 # define STRCPY_RESULT(dst, len) dst
  22 # define TEST_MAIN
  23 # define TEST_NAME "strcpy_chk"
  24 # include "../string/test-string.h"
  25
  26 /* This test case implicitly tests the availability of the __chk_fail
  27    symbol, which is part of the public ABI and may be used
  28    externally. */
  29 extern void __attribute__ ((noreturn)) __chk_fail (void);
  30 char *simple_strcpy_chk (char *, const char *, size_t);
  31 extern char *normal_strcpy (char *, const char *, size_t)
  32   __asm ("strcpy");
  33 extern char *__strcpy_chk (char *, const char *, size_t);
  34
  35 IMPL (simple_strcpy_chk, 0)
  36 IMPL (normal_strcpy, 1)
  37 IMPL (__strcpy_chk, 2)
  38
  39 char *
  40 simple_strcpy_chk (char *dst, const char *src, size_t len)
  41 {
  42   char *ret = dst;
  43   if (! len)
  44     __chk_fail ();
  45   while ((*dst++ = *src++) != '\0')
  46     if (--len == 0)
  47       __chk_fail ();
  48   return ret;
  49 }
  50 #endif
  51
  52 #include <fcntl.h>
  53 #include <paths.h>
  54 #include <setjmp.h>
  55 #include <signal.h>
  56
  57 volatile int chk_fail_ok;
  58 jmp_buf chk_fail_buf;
  59
  60 static void
  61 handler (int sig)
  62 {
  63   if (chk_fail_ok)
  64     {
  65       chk_fail_ok = 0;
  66       longjmp (chk_fail_buf, 1);
  67     }
  68   else
  69     _exit (127);
  70 }
  71
  72 typedef char *(*proto_t) (char *, const char *, size_t);
  73
  74 static void
  75 do_one_test (impl_t *impl, char *dst, const char *src,
  76              size_t len, size_t dlen)
  77 {
  78   char *res;
  79   if (dlen <= len)
  80     {
  81       if (impl->test == 1)
  82         return;
  83
  84       chk_fail_ok = 1;
  85       if (setjmp (chk_fail_buf) == 0)
  86         {
  87           res = CALL (impl, dst, src, dlen);
  88           printf ("*** Function %s (%zd; %zd) did not __chk_fail\n",
  89                   impl->name, len, dlen);
  90           chk_fail_ok = 0;
  91           ret = 1;
  92         }
  93       return;
  94     }
  95   else
  96     res = CALL (impl, dst, src, dlen);
  97
  98   if (res != STRCPY_RESULT (dst, len))
  99     {
 100       printf ("Wrong result in function %s %p %p\n", impl->name,
 101               res, STRCPY_RESULT (dst, len));
 102       ret = 1;
 103       return;
 104     }
 105
 106   if (strcmp (dst, src) != 0)
 107     {
 108       printf ("Wrong result in function %s dst \"%s\" src \"%s\"\n",
 109               impl->name, dst, src);
 110       ret = 1;
 111       return;
 112     }
 113
 114   if (HP_TIMING_AVAIL)
 115     {
 116       hp_timing_t start __attribute ((unused));
 117       hp_timing_t stop __attribute ((unused));;
 118       hp_timing_t best_time = ~ (hp_timing_t) 0;
 119       size_t i;
 120
 121       for (i = 0; i < 32; ++i)
 122         {
 123           HP_TIMING_NOW (start);
 124           CALL (impl, dst, src, dlen);
 125           HP_TIMING_NOW (stop);
 126           HP_TIMING_BEST (best_time, start, stop);
 127         }
 128
 129       printf ("\t%zd", (size_t) best_time);
 130     }
 131 }
 132
 133 static void
 134 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 135 {
 136   size_t i;
 137   char *s1, *s2;
 138
 139   align1 &= 7;
 140   if (align1 + len >= page_size)
 141     return;
 142
 143   align2 &= 7;
 144   if (align2 + len >= page_size)
 145     return;
 146
 147   s1 = (char *) buf1 + align1;
 148   s2 = (char *) buf2 + align2;
 149
 150   for (i = 0; i < len; i++)
 151     s1[i] = 32 + 23 * i % (max_char - 32);
 152   s1[len] = 0;
 153
 154   if (HP_TIMING_AVAIL && dlen > len)
 155     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 156
 157   FOR_EACH_IMPL (impl, 0)
 158     do_one_test (impl, s2, s1, len, dlen);
 159
 160   if (HP_TIMING_AVAIL && dlen > len)
 161     putchar ('\n');
 162 }
 163
 164 static void
 165 do_random_tests (void)
 166 {
 167   size_t i, j, n, align1, align2, len, dlen;
 168   unsigned char *p1 = buf1 + page_size - 512;
 169   unsigned char *p2 = buf2 + page_size - 512;
 170   unsigned char *res;
 171
 172   for (n = 0; n < ITERATIONS; n++)
 173     {
 174       align1 = random () & 31;
 175       if (random () & 1)
 176         align2 = random () & 31;
 177       else
 178         align2 = align1 + (random () & 24);
 179       len = random () & 511;
 180       j = align1;
 181       if (align2 > j)
 182         j = align2;
 183       if (len + j >= 511)
 184         len = 510 - j - (random () & 7);
 185       j = len + align1 + 64;
 186       if (j > 512)
 187         j = 512;
 188       for (i = 0; i < j; i++)
 189         {
 190           if (i == len + align1)
 191             p1[i] = 0;
 192           else
 193             {
 194               p1[i] = random () & 255;
 195               if (i >= align1 && i < len + align1 && !p1[i])
 196                 p1[i] = (random () & 127) + 3;
 197             }
 198         }
 199
 200       switch (random () & 7)
 201         {
 202         case 0:
 203           dlen = len - (random () & 31);
 204           if (dlen > len)
 205             dlen = len;
 206           break;
 207         case 1:
 208           dlen = (size_t) -1;
 209           break;
 210         case 2:
 211           dlen = len + 1 + (random () & 65535);
 212           break;
 213         case 3:
 214           dlen = len + 1 + (random () & 255);
 215           break;
 216         case 4:
 217           dlen = len + 1 + (random () & 31);
 218           break;
 219         case 5:
 220           dlen = len + 1 + (random () & 7);
 221           break;
 222         case 6:
 223           dlen = len + 1 + (random () & 3);
 224           break;
 225         default:
 226           dlen = len + 1;
 227           break;
 228         }
 229
 230       FOR_EACH_IMPL (impl, 1)
 231         {
 232           if (dlen <= len)
 233             {
 234               if (impl->test != 1)
 235                 {
 236                   chk_fail_ok = 1;
 237                   if (setjmp (chk_fail_buf) == 0)
 238                     {
 239                       res = (unsigned char *)
 240                             CALL (impl, (char *) p2 + align2,
 241                                   (char *) p1 + align1, dlen);
 242                       printf ("Iteration %zd - did not __chk_fail\n", n);
 243                       chk_fail_ok = 0;
 244                       ret = 1;
 245                     }
 246                 }
 247               continue;
 248             }
 249           memset (p2 - 64, '\1', 512 + 64);
 250           res = (unsigned char *)
 251                 CALL (impl, (char *) p2 + align2, (char *) p1 + align1, dlen);
 252           if (res != STRCPY_RESULT (p2 + align2, len))
 253             {
 254               printf ("\
 255 Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p\n",
 256                       n, impl->name, align1, align2, len, res,
 257                       STRCPY_RESULT (p2 + align2, len));
 258               ret = 1;
 259             }
 260           for (j = 0; j < align2 + 64; ++j)
 261             {
 262               if (p2[j - 64] != '\1')
 263                 {
 264                   printf ("\
 265 Iteration %zd - garbage before, %s (%zd, %zd, %zd)\n",
 266                           n, impl->name, align1, align2, len);
 267                   ret = 1;
 268                   break;
 269                 }
 270             }
 271           for (j = align2 + len + 1; j < 512; ++j)
 272             {
 273               if (p2[j] != '\1')
 274                 {
 275                   printf ("\
 276 Iteration %zd - garbage after, %s (%zd, %zd, %zd)\n",
 277                           n, impl->name, align1, align2, len);
 278                   ret = 1;
 279                   break;
 280                 }
 281             }
 282           if (memcmp (p1 + align1, p2 + align2, len + 1))
 283             {
 284               printf ("\
 285 Iteration %zd - different strings, %s (%zd, %zd, %zd)\n",
 286                       n, impl->name, align1, align2, len);
 287               ret = 1;
 288             }
 289         }
 290     }
 291 }
 292
 293 int
 294 test_main (void)
 295 {
 296   size_t i;
 297
 298   struct sigaction sa;
 299   sa.sa_handler = handler;
 300   sa.sa_flags = 0;
 301   sigemptyset (&sa.sa_mask);
 302
 303   sigaction (SIGABRT, &sa, NULL);
 304
 305   /* Avoid all the buffer overflow messages on stderr.  */
 306   int fd = open (_PATH_DEVNULL, O_WRONLY);
 307   if (fd == -1)
 308     close (STDERR_FILENO);
 309   else
 310     {
 311       dup2 (fd, STDERR_FILENO);
 312       close (fd);
 313     }
 314   setenv ("LIBC_FATAL_STDERR_", "1", 1);
 315
 316   test_init ();
 317
 318   printf ("%23s", "");
 319   FOR_EACH_IMPL (impl, 0)
 320     printf ("\t%s", impl->name);
 321   putchar ('\n');
 322
 323   for (i = 0; i < 16; ++i)
 324     {
 325       do_test (0, 0, i, i + 1, 127);
 326       do_test (0, 0, i, i + 1, 255);
 327       do_test (0, i, i, i + 1, 127);
 328       do_test (i, 0, i, i + 1, 255);
 329     }
 330
 331   for (i = 1; i < 8; ++i)
 332     {
 333       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 334       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 335     }
 336
 337   for (i = 1; i < 8; ++i)
 338     {
 339       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 340       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 341       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 342       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 343     }
 344
 345   for (i = 0; i < 16; ++i)
 346     {
 347       do_test (0, 0, i, i + 256, 127);
 348       do_test (0, 0, i, i + 256, 255);
 349       do_test (0, i, i, i + 256, 127);
 350       do_test (i, 0, i, i + 256, 255);
 351     }
 352
 353   for (i = 1; i < 8; ++i)
 354     {
 355       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 356       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 357     }
 358
 359   for (i = 1; i < 8; ++i)
 360     {
 361       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 362       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 363       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 364       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 365     }
 366
 367   for (i = 0; i < 16; ++i)
 368     {
 369       do_test (0, 0, i, i, 127);
 370       do_test (0, 0, i, i + 2, 255);
 371       do_test (0, i, i, i + 3, 127);
 372       do_test (i, 0, i, i + 4, 255);
 373     }
 374
 375   for (i = 1; i < 8; ++i)
 376     {
 377       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 378       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 379     }
 380
 381   for (i = 1; i < 8; ++i)
 382     {
 383       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 384       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 385       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 386       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 387     }
 388
 389   do_random_tests ();
 390   return ret;
 391 }
 392
 393 #include "../test-skeleton.c"