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
 115 static void
 116 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 117 {
 118   size_t i;
 119   char *s1, *s2;
 120
 121   align1 &= 7;
 122   if (align1 + len >= page_size)
 123     return;
 124
 125   align2 &= 7;
 126   if (align2 + len >= page_size)
 127     return;
 128
 129   s1 = (char *) buf1 + align1;
 130   s2 = (char *) buf2 + align2;
 131
 132   for (i = 0; i < len; i++)
 133     s1[i] = 32 + 23 * i % (max_char - 32);
 134   s1[len] = 0;
 135
 136   FOR_EACH_IMPL (impl, 0)
 137     do_one_test (impl, s2, s1, len, dlen);
 138 }
 139
 140 static void
 141 do_random_tests (void)
 142 {
 143   size_t i, j, n, align1, align2, len, dlen;
 144   unsigned char *p1 = buf1 + page_size - 512;
 145   unsigned char *p2 = buf2 + page_size - 512;
 146   unsigned char *res;
 147
 148   for (n = 0; n < ITERATIONS; n++)
 149     {
 150       align1 = random () & 31;
 151       if (random () & 1)
 152         align2 = random () & 31;
 153       else
 154         align2 = align1 + (random () & 24);
 155       len = random () & 511;
 156       j = align1;
 157       if (align2 > j)
 158         j = align2;
 159       if (len + j >= 511)
 160         len = 510 - j - (random () & 7);
 161       j = len + align1 + 64;
 162       if (j > 512)
 163         j = 512;
 164       for (i = 0; i < j; i++)
 165         {
 166           if (i == len + align1)
 167             p1[i] = 0;
 168           else
 169             {
 170               p1[i] = random () & 255;
 171               if (i >= align1 && i < len + align1 && !p1[i])
 172                 p1[i] = (random () & 127) + 3;
 173             }
 174         }
 175
 176       switch (random () & 7)
 177         {
 178         case 0:
 179           dlen = len - (random () & 31);
 180           if (dlen > len)
 181             dlen = len;
 182           break;
 183         case 1:
 184           dlen = (size_t) -1;
 185           break;
 186         case 2:
 187           dlen = len + 1 + (random () & 65535);
 188           break;
 189         case 3:
 190           dlen = len + 1 + (random () & 255);
 191           break;
 192         case 4:
 193           dlen = len + 1 + (random () & 31);
 194           break;
 195         case 5:
 196           dlen = len + 1 + (random () & 7);
 197           break;
 198         case 6:
 199           dlen = len + 1 + (random () & 3);
 200           break;
 201         default:
 202           dlen = len + 1;
 203           break;
 204         }
 205
 206       FOR_EACH_IMPL (impl, 1)
 207         {
 208           if (dlen <= len)
 209             {
 210               if (impl->test != 1)
 211                 {
 212                   chk_fail_ok = 1;
 213                   if (setjmp (chk_fail_buf) == 0)
 214                     {
 215                       res = (unsigned char *)
 216                             CALL (impl, (char *) p2 + align2,
 217                                   (char *) p1 + align1, dlen);
 218                       printf ("Iteration %zd - did not __chk_fail\n", n);
 219                       chk_fail_ok = 0;
 220                       ret = 1;
 221                     }
 222                 }
 223               continue;
 224             }
 225           memset (p2 - 64, '\1', 512 + 64);
 226           res = (unsigned char *)
 227                 CALL (impl, (char *) p2 + align2, (char *) p1 + align1, dlen);
 228           if (res != STRCPY_RESULT (p2 + align2, len))
 229             {
 230               printf ("\
 231 Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p\n",
 232                       n, impl->name, align1, align2, len, res,
 233                       STRCPY_RESULT (p2 + align2, len));
 234               ret = 1;
 235             }
 236           for (j = 0; j < align2 + 64; ++j)
 237             {
 238               if (p2[j - 64] != '\1')
 239                 {
 240                   printf ("\
 241 Iteration %zd - garbage before, %s (%zd, %zd, %zd)\n",
 242                           n, impl->name, align1, align2, len);
 243                   ret = 1;
 244                   break;
 245                 }
 246             }
 247           for (j = align2 + len + 1; j < 512; ++j)
 248             {
 249               if (p2[j] != '\1')
 250                 {
 251                   printf ("\
 252 Iteration %zd - garbage after, %s (%zd, %zd, %zd)\n",
 253                           n, impl->name, align1, align2, len);
 254                   ret = 1;
 255                   break;
 256                 }
 257             }
 258           if (memcmp (p1 + align1, p2 + align2, len + 1))
 259             {
 260               printf ("\
 261 Iteration %zd - different strings, %s (%zd, %zd, %zd)\n",
 262                       n, impl->name, align1, align2, len);
 263               ret = 1;
 264             }
 265         }
 266     }
 267 }
 268
 269 int
 270 test_main (void)
 271 {
 272   size_t i;
 273
 274   struct sigaction sa;
 275   sa.sa_handler = handler;
 276   sa.sa_flags = 0;
 277   sigemptyset (&sa.sa_mask);
 278
 279   sigaction (SIGABRT, &sa, NULL);
 280
 281   /* Avoid all the buffer overflow messages on stderr.  */
 282   int fd = open (_PATH_DEVNULL, O_WRONLY);
 283   if (fd == -1)
 284     close (STDERR_FILENO);
 285   else
 286     {
 287       dup2 (fd, STDERR_FILENO);
 288       close (fd);
 289     }
 290   setenv ("LIBC_FATAL_STDERR_", "1", 1);
 291
 292   test_init ();
 293
 294   printf ("%23s", "");
 295   FOR_EACH_IMPL (impl, 0)
 296     printf ("\t%s", impl->name);
 297   putchar ('\n');
 298
 299   for (i = 0; i < 16; ++i)
 300     {
 301       do_test (0, 0, i, i + 1, 127);
 302       do_test (0, 0, i, i + 1, 255);
 303       do_test (0, i, i, i + 1, 127);
 304       do_test (i, 0, i, i + 1, 255);
 305     }
 306
 307   for (i = 1; i < 8; ++i)
 308     {
 309       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 310       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 311     }
 312
 313   for (i = 1; i < 8; ++i)
 314     {
 315       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 316       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 317       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 318       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 319     }
 320
 321   for (i = 0; i < 16; ++i)
 322     {
 323       do_test (0, 0, i, i + 256, 127);
 324       do_test (0, 0, i, i + 256, 255);
 325       do_test (0, i, i, i + 256, 127);
 326       do_test (i, 0, i, i + 256, 255);
 327     }
 328
 329   for (i = 1; i < 8; ++i)
 330     {
 331       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 332       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 333     }
 334
 335   for (i = 1; i < 8; ++i)
 336     {
 337       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 338       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 339       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 340       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 341     }
 342
 343   for (i = 0; i < 16; ++i)
 344     {
 345       do_test (0, 0, i, i, 127);
 346       do_test (0, 0, i, i + 2, 255);
 347       do_test (0, i, i, i + 3, 127);
 348       do_test (i, 0, i, i + 4, 255);
 349     }
 350
 351   for (i = 1; i < 8; ++i)
 352     {
 353       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 354       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 355     }
 356
 357   for (i = 1; i < 8; ++i)
 358     {
 359       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 360       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 361       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 362       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 363     }
 364
 365   do_random_tests ();
 366   return ret;
 367 }
 368
 369 #include "../test-skeleton.c"