debug/test-strcpy_chk.c

   1 /* Test and measure __strcpy_chk functions.
   2    Copyright (C) 1999-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef STRCPY_RESULT
  20 # define STRCPY_RESULT(dst, len) dst
  21 # define TEST_MAIN
  22 # define TEST_NAME "strcpy_chk"
  23 # include <string/test-string.h>
  24
  25 /* This test case implicitly tests the availability of the __chk_fail
  26    symbol, which is part of the public ABI and may be used
  27    externally. */
  28 extern void __attribute__ ((noreturn)) __chk_fail (void);
  29 char *simple_strcpy_chk (char *, const char *, size_t);
  30 extern char *normal_strcpy (char *, const char *, size_t)
  31   __asm ("strcpy");
  32 extern char *__strcpy_chk (char *, const char *, size_t);
  33
  34 IMPL (simple_strcpy_chk, 0)
  35 IMPL (normal_strcpy, 1)
  36 IMPL (__strcpy_chk, 2)
  37
  38 char *
  39 simple_strcpy_chk (char *dst, const char *src, size_t len)
  40 {
  41   char *ret = dst;
  42   if (! len)
  43     __chk_fail ();
  44   while ((*dst++ = *src++) != '\0')
  45     if (--len == 0)
  46       __chk_fail ();
  47   return ret;
  48 }
  49 #endif
  50
  51 #include <fcntl.h>
  52 #include <paths.h>
  53 #include <setjmp.h>
  54 #include <signal.h>
  55
  56 static int test_main (void);
  57 #define TEST_FUNCTION test_main
  58 #include <support/test-driver.c>
  59 #include <support/support.h>
  60
  61 volatile int chk_fail_ok;
  62 sigjmp_buf chk_fail_buf;
  63
  64 static void
  65 handler (int sig)
  66 {
  67   if (chk_fail_ok)
  68     {
  69       chk_fail_ok = 0;
  70       longjmp (chk_fail_buf, 1);
  71     }
  72   else
  73     _exit (127);
  74 }
  75
  76 typedef char *(*proto_t) (char *, const char *, size_t);
  77
  78 static void
  79 do_one_test (impl_t *impl, char *dst, const char *src,
  80              size_t len, size_t dlen)
  81 {
  82   char *res;
  83   if (dlen <= len)
  84     {
  85       if (impl->test == 1)
  86         return;
  87
  88       chk_fail_ok = 1;
  89       if (sigsetjmp (chk_fail_buf, 1) == 0)
  90         {
  91           res = CALL (impl, dst, src, dlen);
  92           printf ("*** Function %s (%zd; %zd) did not __chk_fail\n",
  93                   impl->name, len, dlen);
  94           chk_fail_ok = 0;
  95           ret = 1;
  96         }
  97       return;
  98     }
  99   else
 100     res = CALL (impl, dst, src, dlen);
 101
 102   if (res != STRCPY_RESULT (dst, len))
 103     {
 104       printf ("Wrong result in function %s %p %p\n", impl->name,
 105               res, STRCPY_RESULT (dst, len));
 106       ret = 1;
 107       return;
 108     }
 109
 110   if (strcmp (dst, src) != 0)
 111     {
 112       printf ("Wrong result in function %s dst \"%s\" src \"%s\"\n",
 113               impl->name, dst, src);
 114       ret = 1;
 115       return;
 116     }
 117 }
 118
 119 static void
 120 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 121 {
 122   size_t i;
 123   char *s1, *s2;
 124
 125   align1 &= 7;
 126   if (align1 + len >= page_size)
 127     return;
 128
 129   align2 &= 7;
 130   if (align2 + len >= page_size)
 131     return;
 132
 133   s1 = (char *) buf1 + align1;
 134   s2 = (char *) buf2 + align2;
 135
 136   for (i = 0; i < len; i++)
 137     s1[i] = 32 + 23 * i % (max_char - 32);
 138   s1[len] = 0;
 139
 140   FOR_EACH_IMPL (impl, 0)
 141     do_one_test (impl, s2, s1, len, dlen);
 142 }
 143
 144 static void
 145 do_random_tests (void)
 146 {
 147   size_t i, j, n, align1, align2, len, dlen;
 148   unsigned char *p1 = buf1 + page_size - 512;
 149   unsigned char *p2 = buf2 + page_size - 512;
 150   unsigned char *res;
 151
 152   for (n = 0; n < ITERATIONS; n++)
 153     {
 154       align1 = random () & 31;
 155       if (random () & 1)
 156         align2 = random () & 31;
 157       else
 158         align2 = align1 + (random () & 24);
 159       len = random () & 511;
 160       j = align1;
 161       if (align2 > j)
 162         j = align2;
 163       if (len + j >= 511)
 164         len = 510 - j - (random () & 7);
 165       j = len + align1 + 64;
 166       if (j > 512)
 167         j = 512;
 168       for (i = 0; i < j; i++)
 169         {
 170           if (i == len + align1)
 171             p1[i] = 0;
 172           else
 173             {
 174               p1[i] = random () & 255;
 175               if (i >= align1 && i < len + align1 && !p1[i])
 176                 p1[i] = (random () & 127) + 3;
 177             }
 178         }
 179
 180       switch (random () & 7)
 181         {
 182         case 0:
 183           dlen = len - (random () & 31);
 184           if (dlen > len)
 185             dlen = len;
 186           break;
 187         case 1:
 188           dlen = (size_t) -1;
 189           break;
 190         case 2:
 191           dlen = len + 1 + (random () & 65535);
 192           break;
 193         case 3:
 194           dlen = len + 1 + (random () & 255);
 195           break;
 196         case 4:
 197           dlen = len + 1 + (random () & 31);
 198           break;
 199         case 5:
 200           dlen = len + 1 + (random () & 7);
 201           break;
 202         case 6:
 203           dlen = len + 1 + (random () & 3);
 204           break;
 205         default:
 206           dlen = len + 1;
 207           break;
 208         }
 209
 210       FOR_EACH_IMPL (impl, 1)
 211         {
 212           if (dlen <= len)
 213             {
 214               if (impl->test != 1)
 215                 {
 216                   chk_fail_ok = 1;
 217                   if (sigsetjmp (chk_fail_buf, 1) == 0)
 218                     {
 219                       res = (unsigned char *)
 220                             CALL (impl, (char *) p2 + align2,
 221                                   (char *) p1 + align1, dlen);
 222                       printf ("Iteration %zd - did not __chk_fail\n", n);
 223                       chk_fail_ok = 0;
 224                       ret = 1;
 225                     }
 226                 }
 227               continue;
 228             }
 229           memset (p2 - 64, '\1', 512 + 64);
 230           res = (unsigned char *)
 231                 CALL (impl, (char *) p2 + align2, (char *) p1 + align1, dlen);
 232           if (res != STRCPY_RESULT (p2 + align2, len))
 233             {
 234               printf ("\
 235 Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p\n",
 236                       n, impl->name, align1, align2, len, res,
 237                       STRCPY_RESULT (p2 + align2, len));
 238               ret = 1;
 239             }
 240           for (j = 0; j < align2 + 64; ++j)
 241             {
 242               if (p2[j - 64] != '\1')
 243                 {
 244                   printf ("\
 245 Iteration %zd - garbage before, %s (%zd, %zd, %zd)\n",
 246                           n, impl->name, align1, align2, len);
 247                   ret = 1;
 248                   break;
 249                 }
 250             }
 251           for (j = align2 + len + 1; j < 512; ++j)
 252             {
 253               if (p2[j] != '\1')
 254                 {
 255                   printf ("\
 256 Iteration %zd - garbage after, %s (%zd, %zd, %zd)\n",
 257                           n, impl->name, align1, align2, len);
 258                   ret = 1;
 259                   break;
 260                 }
 261             }
 262           if (memcmp (p1 + align1, p2 + align2, len + 1))
 263             {
 264               printf ("\
 265 Iteration %zd - different strings, %s (%zd, %zd, %zd)\n",
 266                       n, impl->name, align1, align2, len);
 267               ret = 1;
 268             }
 269         }
 270     }
 271 }
 272
 273 static int
 274 test_main (void)
 275 {
 276   size_t i;
 277
 278   set_fortify_handler (handler);
 279
 280   test_init ();
 281
 282   printf ("%23s", "");
 283   FOR_EACH_IMPL (impl, 0)
 284     printf ("\t%s", impl->name);
 285   putchar ('\n');
 286
 287   for (i = 0; i < 16; ++i)
 288     {
 289       do_test (0, 0, i, i + 1, 127);
 290       do_test (0, 0, i, i + 1, 255);
 291       do_test (0, i, i, i + 1, 127);
 292       do_test (i, 0, i, i + 1, 255);
 293     }
 294
 295   for (i = 1; i < 8; ++i)
 296     {
 297       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 298       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 299     }
 300
 301   for (i = 1; i < 8; ++i)
 302     {
 303       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 304       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 305       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 306       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 307     }
 308
 309   for (i = 0; i < 16; ++i)
 310     {
 311       do_test (0, 0, i, i + 256, 127);
 312       do_test (0, 0, i, i + 256, 255);
 313       do_test (0, i, i, i + 256, 127);
 314       do_test (i, 0, i, i + 256, 255);
 315     }
 316
 317   for (i = 1; i < 8; ++i)
 318     {
 319       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 320       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 321     }
 322
 323   for (i = 1; i < 8; ++i)
 324     {
 325       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 326       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 327       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 328       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 329     }
 330
 331   for (i = 0; i < 16; ++i)
 332     {
 333       do_test (0, 0, i, i, 127);
 334       do_test (0, 0, i, i + 2, 255);
 335       do_test (0, i, i, i + 3, 127);
 336       do_test (i, 0, i, i + 4, 255);
 337     }
 338
 339   for (i = 1; i < 8; ++i)
 340     {
 341       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 342       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 343     }
 344
 345   for (i = 1; i < 8; ++i)
 346     {
 347       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 348       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 349       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 350       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 351     }
 352
 353   do_random_tests ();
 354   return ret;
 355 }