debug/test-strcpy_chk.c

   1 /* Test and measure __strcpy_chk functions.
   2    Copyright (C) 1999-2017 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 static int test_main (void);
  58 #define TEST_FUNCTION test_main
  59 #include <support/test-driver.c>
  60 #include <support/support.h>
  61
  62 volatile int chk_fail_ok;
  63 jmp_buf chk_fail_buf;
  64
  65 static void
  66 handler (int sig)
  67 {
  68   if (chk_fail_ok)
  69     {
  70       chk_fail_ok = 0;
  71       longjmp (chk_fail_buf, 1);
  72     }
  73   else
  74     _exit (127);
  75 }
  76
  77 typedef char *(*proto_t) (char *, const char *, size_t);
  78
  79 static void
  80 do_one_test (impl_t *impl, char *dst, const char *src,
  81              size_t len, size_t dlen)
  82 {
  83   char *res;
  84   if (dlen <= len)
  85     {
  86       if (impl->test == 1)
  87         return;
  88
  89       chk_fail_ok = 1;
  90       if (setjmp (chk_fail_buf) == 0)
  91         {
  92           res = CALL (impl, dst, src, dlen);
  93           printf ("*** Function %s (%zd; %zd) did not __chk_fail\n",
  94                   impl->name, len, dlen);
  95           chk_fail_ok = 0;
  96           ret = 1;
  97         }
  98       return;
  99     }
 100   else
 101     res = CALL (impl, dst, src, dlen);
 102
 103   if (res != STRCPY_RESULT (dst, len))
 104     {
 105       printf ("Wrong result in function %s %p %p\n", impl->name,
 106               res, STRCPY_RESULT (dst, len));
 107       ret = 1;
 108       return;
 109     }
 110
 111   if (strcmp (dst, src) != 0)
 112     {
 113       printf ("Wrong result in function %s dst \"%s\" src \"%s\"\n",
 114               impl->name, dst, src);
 115       ret = 1;
 116       return;
 117     }
 118 }
 119
 120 static void
 121 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 122 {
 123   size_t i;
 124   char *s1, *s2;
 125
 126   align1 &= 7;
 127   if (align1 + len >= page_size)
 128     return;
 129
 130   align2 &= 7;
 131   if (align2 + len >= page_size)
 132     return;
 133
 134   s1 = (char *) buf1 + align1;
 135   s2 = (char *) buf2 + align2;
 136
 137   for (i = 0; i < len; i++)
 138     s1[i] = 32 + 23 * i % (max_char - 32);
 139   s1[len] = 0;
 140
 141   FOR_EACH_IMPL (impl, 0)
 142     do_one_test (impl, s2, s1, len, dlen);
 143 }
 144
 145 static void
 146 do_random_tests (void)
 147 {
 148   size_t i, j, n, align1, align2, len, dlen;
 149   unsigned char *p1 = buf1 + page_size - 512;
 150   unsigned char *p2 = buf2 + page_size - 512;
 151   unsigned char *res;
 152
 153   for (n = 0; n < ITERATIONS; n++)
 154     {
 155       align1 = random () & 31;
 156       if (random () & 1)
 157         align2 = random () & 31;
 158       else
 159         align2 = align1 + (random () & 24);
 160       len = random () & 511;
 161       j = align1;
 162       if (align2 > j)
 163         j = align2;
 164       if (len + j >= 511)
 165         len = 510 - j - (random () & 7);
 166       j = len + align1 + 64;
 167       if (j > 512)
 168         j = 512;
 169       for (i = 0; i < j; i++)
 170         {
 171           if (i == len + align1)
 172             p1[i] = 0;
 173           else
 174             {
 175               p1[i] = random () & 255;
 176               if (i >= align1 && i < len + align1 && !p1[i])
 177                 p1[i] = (random () & 127) + 3;
 178             }
 179         }
 180
 181       switch (random () & 7)
 182         {
 183         case 0:
 184           dlen = len - (random () & 31);
 185           if (dlen > len)
 186             dlen = len;
 187           break;
 188         case 1:
 189           dlen = (size_t) -1;
 190           break;
 191         case 2:
 192           dlen = len + 1 + (random () & 65535);
 193           break;
 194         case 3:
 195           dlen = len + 1 + (random () & 255);
 196           break;
 197         case 4:
 198           dlen = len + 1 + (random () & 31);
 199           break;
 200         case 5:
 201           dlen = len + 1 + (random () & 7);
 202           break;
 203         case 6:
 204           dlen = len + 1 + (random () & 3);
 205           break;
 206         default:
 207           dlen = len + 1;
 208           break;
 209         }
 210
 211       FOR_EACH_IMPL (impl, 1)
 212         {
 213           if (dlen <= len)
 214             {
 215               if (impl->test != 1)
 216                 {
 217                   chk_fail_ok = 1;
 218                   if (setjmp (chk_fail_buf) == 0)
 219                     {
 220                       res = (unsigned char *)
 221                             CALL (impl, (char *) p2 + align2,
 222                                   (char *) p1 + align1, dlen);
 223                       printf ("Iteration %zd - did not __chk_fail\n", n);
 224                       chk_fail_ok = 0;
 225                       ret = 1;
 226                     }
 227                 }
 228               continue;
 229             }
 230           memset (p2 - 64, '\1', 512 + 64);
 231           res = (unsigned char *)
 232                 CALL (impl, (char *) p2 + align2, (char *) p1 + align1, dlen);
 233           if (res != STRCPY_RESULT (p2 + align2, len))
 234             {
 235               printf ("\
 236 Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p\n",
 237                       n, impl->name, align1, align2, len, res,
 238                       STRCPY_RESULT (p2 + align2, len));
 239               ret = 1;
 240             }
 241           for (j = 0; j < align2 + 64; ++j)
 242             {
 243               if (p2[j - 64] != '\1')
 244                 {
 245                   printf ("\
 246 Iteration %zd - garbage before, %s (%zd, %zd, %zd)\n",
 247                           n, impl->name, align1, align2, len);
 248                   ret = 1;
 249                   break;
 250                 }
 251             }
 252           for (j = align2 + len + 1; j < 512; ++j)
 253             {
 254               if (p2[j] != '\1')
 255                 {
 256                   printf ("\
 257 Iteration %zd - garbage after, %s (%zd, %zd, %zd)\n",
 258                           n, impl->name, align1, align2, len);
 259                   ret = 1;
 260                   break;
 261                 }
 262             }
 263           if (memcmp (p1 + align1, p2 + align2, len + 1))
 264             {
 265               printf ("\
 266 Iteration %zd - different strings, %s (%zd, %zd, %zd)\n",
 267                       n, impl->name, align1, align2, len);
 268               ret = 1;
 269             }
 270         }
 271     }
 272 }
 273
 274 static int
 275 test_main (void)
 276 {
 277   size_t i;
 278
 279   set_fortify_handler (handler);
 280
 281   test_init ();
 282
 283   printf ("%23s", "");
 284   FOR_EACH_IMPL (impl, 0)
 285     printf ("\t%s", impl->name);
 286   putchar ('\n');
 287
 288   for (i = 0; i < 16; ++i)
 289     {
 290       do_test (0, 0, i, i + 1, 127);
 291       do_test (0, 0, i, i + 1, 255);
 292       do_test (0, i, i, i + 1, 127);
 293       do_test (i, 0, i, i + 1, 255);
 294     }
 295
 296   for (i = 1; i < 8; ++i)
 297     {
 298       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 299       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 300     }
 301
 302   for (i = 1; i < 8; ++i)
 303     {
 304       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 305       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 306       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 307       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 308     }
 309
 310   for (i = 0; i < 16; ++i)
 311     {
 312       do_test (0, 0, i, i + 256, 127);
 313       do_test (0, 0, i, i + 256, 255);
 314       do_test (0, i, i, i + 256, 127);
 315       do_test (i, 0, i, i + 256, 255);
 316     }
 317
 318   for (i = 1; i < 8; ++i)
 319     {
 320       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 321       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 322     }
 323
 324   for (i = 1; i < 8; ++i)
 325     {
 326       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 327       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 328       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 329       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 330     }
 331
 332   for (i = 0; i < 16; ++i)
 333     {
 334       do_test (0, 0, i, i, 127);
 335       do_test (0, 0, i, i + 2, 255);
 336       do_test (0, i, i, i + 3, 127);
 337       do_test (i, 0, i, i + 4, 255);
 338     }
 339
 340   for (i = 1; i < 8; ++i)
 341     {
 342       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 343       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 344     }
 345
 346   for (i = 1; i < 8; ++i)
 347     {
 348       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 349       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 350       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 351       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 352     }
 353
 354   do_random_tests ();
 355   return ret;
 356 }