debug/test-strcpy_chk.c

   1 /* Test and measure __strcpy_chk functions.
   2    Copyright (C) 1999, 2002, 2003, 2004 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef STRCPY_RESULT
  22 # define STRCPY_RESULT(dst, len) dst
  23 # define TEST_MAIN
  24 # include "../string/test-string.h"
  25
  26 extern void __attribute__ ((noreturn)) __chk_fail (void);
  27 char *simple_strcpy_chk (char *, const char *, size_t);
  28 extern char *normal_strcpy (char *, const char *, size_t)
  29   __asm ("strcpy");
  30 extern char *__strcpy_chk (char *, const char *, size_t);
  31
  32 IMPL (simple_strcpy_chk, 0)
  33 IMPL (normal_strcpy, 1)
  34 IMPL (__strcpy_chk, 2)
  35
  36 char *
  37 simple_strcpy_chk (char *dst, const char *src, size_t len)
  38 {
  39   char *ret = dst;
  40   if (! len)
  41     __chk_fail ();
  42   while ((*dst++ = *src++) != '\0')
  43     if (--len == 0)
  44       __chk_fail ();
  45   return ret;
  46 }
  47 #endif
  48
  49 #include <fcntl.h>
  50 #include <paths.h>
  51 #include <setjmp.h>
  52 #include <signal.h>
  53
  54 volatile int chk_fail_ok;
  55 jmp_buf chk_fail_buf;
  56
  57 static void
  58 handler (int sig)
  59 {
  60   if (chk_fail_ok)
  61     {
  62       chk_fail_ok = 0;
  63       longjmp (chk_fail_buf, 1);
  64     }
  65   else
  66     _exit (127);
  67 }
  68
  69 typedef char *(*proto_t) (char *, const char *, size_t);
  70
  71 static void
  72 do_one_test (impl_t *impl, char *dst, const char *src,
  73              size_t len, size_t dlen)
  74 {
  75   char *res;
  76   if (dlen <= len)
  77     {
  78       if (impl->test == 1)
  79         return;
  80
  81       chk_fail_ok = 1;
  82       if (setjmp (chk_fail_buf) == 0)
  83         {
  84           res = CALL (impl, dst, src, dlen);
  85           printf ("*** Function %s (%zd; %zd) did not __chk_fail\n",
  86                   impl->name, len, dlen);
  87           chk_fail_ok = 0;
  88           ret = 1;
  89         }
  90       return;
  91     }
  92   else
  93     res = CALL (impl, dst, src, dlen);
  94
  95   if (res != STRCPY_RESULT (dst, len))
  96     {
  97       printf ("Wrong result in function %s %p %p\n", impl->name,
  98               res, STRCPY_RESULT (dst, len));
  99       ret = 1;
 100       return;
 101     }
 102
 103   if (strcmp (dst, src) != 0)
 104     {
 105       printf ("Wrong result in function %s dst \"%s\" src \"%s\"\n",
 106               impl->name, dst, src);
 107       ret = 1;
 108       return;
 109     }
 110
 111   if (HP_TIMING_AVAIL)
 112     {
 113       hp_timing_t start __attribute ((unused));
 114       hp_timing_t stop __attribute ((unused));;
 115       hp_timing_t best_time = ~ (hp_timing_t) 0;
 116       size_t i;
 117
 118       for (i = 0; i < 32; ++i)
 119         {
 120           HP_TIMING_NOW (start);
 121           CALL (impl, dst, src, dlen);
 122           HP_TIMING_NOW (stop);
 123           HP_TIMING_BEST (best_time, start, stop);
 124         }
 125
 126       printf ("\t%zd", (size_t) best_time);
 127     }
 128 }
 129
 130 static void
 131 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 132 {
 133   size_t i;
 134   char *s1, *s2;
 135
 136   align1 &= 7;
 137   if (align1 + len >= page_size)
 138     return;
 139
 140   align2 &= 7;
 141   if (align2 + len >= page_size)
 142     return;
 143
 144   s1 = (char *) buf1 + align1;
 145   s2 = (char *) buf2 + align2;
 146
 147   for (i = 0; i < len; i++)
 148     s1[i] = 32 + 23 * i % (max_char - 32);
 149   s1[len] = 0;
 150
 151   if (HP_TIMING_AVAIL && dlen > len)
 152     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 153
 154   FOR_EACH_IMPL (impl, 0)
 155     do_one_test (impl, s2, s1, len, dlen);
 156
 157   if (HP_TIMING_AVAIL && dlen > len)
 158     putchar ('\n');
 159 }
 160
 161 static void
 162 do_random_tests (void)
 163 {
 164   size_t i, j, n, align1, align2, len, dlen;
 165   unsigned char *p1 = buf1 + page_size - 512;
 166   unsigned char *p2 = buf2 + page_size - 512;
 167   unsigned char *res;
 168
 169   for (n = 0; n < ITERATIONS; n++)
 170     {
 171       align1 = random () & 31;
 172       if (random () & 1)
 173         align2 = random () & 31;
 174       else
 175         align2 = align1 + (random () & 24);
 176       len = random () & 511;
 177       j = align1;
 178       if (align2 > j)
 179         j = align2;
 180       if (len + j >= 511)
 181         len = 510 - j - (random () & 7);
 182       j = len + align1 + 64;
 183       if (j > 512)
 184         j = 512;
 185       for (i = 0; i < j; i++)
 186         {
 187           if (i == len + align1)
 188             p1[i] = 0;
 189           else
 190             {
 191               p1[i] = random () & 255;
 192               if (i >= align1 && i < len + align1 && !p1[i])
 193                 p1[i] = (random () & 127) + 3;
 194             }
 195         }
 196
 197       switch (random () & 7)
 198         {
 199         case 0:
 200           dlen = len - (random () & 31);
 201           if (dlen > len)
 202             dlen = len;
 203           break;
 204         case 1:
 205           dlen = (size_t) -1;
 206           break;
 207         case 2:
 208           dlen = len + 1 + (random () & 65535);
 209           break;
 210         case 3:
 211           dlen = len + 1 + (random () & 255);
 212           break;
 213         case 4:
 214           dlen = len + 1 + (random () & 31);
 215           break;
 216         case 5:
 217           dlen = len + 1 + (random () & 7);
 218           break;
 219         case 6:
 220           dlen = len + 1 + (random () & 3);
 221           break;
 222         default:
 223           dlen = len + 1;
 224           break;
 225         }
 226
 227       FOR_EACH_IMPL (impl, 1)
 228         {
 229           if (dlen <= len)
 230             {
 231               if (impl->test != 1)
 232                 {
 233                   chk_fail_ok = 1;
 234                   if (setjmp (chk_fail_buf) == 0)
 235                     {
 236                       res = (unsigned char *)
 237                             CALL (impl, (char *) p2 + align2,
 238                                   (char *) p1 + align1, dlen);
 239                       printf ("Iteration %zd - did not __chk_fail\n", n);
 240                       chk_fail_ok = 0;
 241                       ret = 1;
 242                     }
 243                 }
 244               continue;
 245             }
 246           memset (p2 - 64, '\1', 512 + 64);
 247           res = (unsigned char *)
 248                 CALL (impl, (char *) p2 + align2, (char *) p1 + align1, dlen);
 249           if (res != STRCPY_RESULT (p2 + align2, len))
 250             {
 251               printf ("\
 252 Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p\n",
 253                       n, impl->name, align1, align2, len, res,
 254                       STRCPY_RESULT (p2 + align2, len));
 255               ret = 1;
 256             }
 257           for (j = 0; j < align2 + 64; ++j)
 258             {
 259               if (p2[j - 64] != '\1')
 260                 {
 261                   printf ("\
 262 Iteration %zd - garbage before, %s (%zd, %zd, %zd)\n",
 263                           n, impl->name, align1, align2, len);
 264                   ret = 1;
 265                   break;
 266                 }
 267             }
 268           for (j = align2 + len + 1; j < 512; ++j)
 269             {
 270               if (p2[j] != '\1')
 271                 {
 272                   printf ("\
 273 Iteration %zd - garbage after, %s (%zd, %zd, %zd)\n",
 274                           n, impl->name, align1, align2, len);
 275                   ret = 1;
 276                   break;
 277                 }
 278             }
 279           if (memcmp (p1 + align1, p2 + align2, len + 1))
 280             {
 281               printf ("\
 282 Iteration %zd - different strings, %s (%zd, %zd, %zd)\n",
 283                       n, impl->name, align1, align2, len);
 284               ret = 1;
 285             }
 286         }
 287     }
 288 }
 289
 290 int
 291 test_main (void)
 292 {
 293   size_t i;
 294
 295   struct sigaction sa;
 296   sa.sa_handler = handler;
 297   sa.sa_flags = 0;
 298   sigemptyset (&sa.sa_mask);
 299
 300   sigaction (SIGABRT, &sa, NULL);
 301
 302   /* Avoid all the buffer overflow messages on stderr.  */
 303   int fd = open (_PATH_DEVNULL, O_WRONLY);
 304   if (fd == -1)
 305     close (STDERR_FILENO);
 306   else
 307     {
 308       dup2 (fd, STDERR_FILENO);
 309       close (fd);
 310     }
 311   setenv ("LIBC_FATAL_STDERR_", "1", 1);
 312
 313   test_init ();
 314
 315   printf ("%23s", "");
 316   FOR_EACH_IMPL (impl, 0)
 317     printf ("\t%s", impl->name);
 318   putchar ('\n');
 319
 320   for (i = 0; i < 16; ++i)
 321     {
 322       do_test (0, 0, i, i + 1, 127);
 323       do_test (0, 0, i, i + 1, 255);
 324       do_test (0, i, i, i + 1, 127);
 325       do_test (i, 0, i, i + 1, 255);
 326     }
 327
 328   for (i = 1; i < 8; ++i)
 329     {
 330       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 331       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 332     }
 333
 334   for (i = 1; i < 8; ++i)
 335     {
 336       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 337       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 338       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 339       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 340     }
 341
 342   for (i = 0; i < 16; ++i)
 343     {
 344       do_test (0, 0, i, i + 256, 127);
 345       do_test (0, 0, i, i + 256, 255);
 346       do_test (0, i, i, i + 256, 127);
 347       do_test (i, 0, i, i + 256, 255);
 348     }
 349
 350   for (i = 1; i < 8; ++i)
 351     {
 352       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 353       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 354     }
 355
 356   for (i = 1; i < 8; ++i)
 357     {
 358       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 359       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 360       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 361       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 362     }
 363
 364   for (i = 0; i < 16; ++i)
 365     {
 366       do_test (0, 0, i, i, 127);
 367       do_test (0, 0, i, i + 2, 255);
 368       do_test (0, i, i, i + 3, 127);
 369       do_test (i, 0, i, i + 4, 255);
 370     }
 371
 372   for (i = 1; i < 8; ++i)
 373     {
 374       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 375       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 376     }
 377
 378   for (i = 1; i < 8; ++i)
 379     {
 380       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 381       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 382       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 383       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 384     }
 385
 386   do_random_tests ();
 387   return ret;
 388 }
 389
 390 #include "../test-skeleton.c"