benchtests/bench-strcpy_chk.c

   1 /* Measure __strcpy_chk functions.
   2    Copyright (C) 2013-2023 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 "bench-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 extern char *normal_strcpy (char *, const char *, size_t)
  30   __asm ("strcpy");
  31 extern char *__strcpy_chk (char *, const char *, size_t);
  32
  33 IMPL (normal_strcpy, 1)
  34 IMPL (__strcpy_chk, 2)
  35
  36 #endif
  37
  38 #include <fcntl.h>
  39 #include <paths.h>
  40 #include <setjmp.h>
  41 #include <signal.h>
  42
  43 #include <support/support.h>
  44
  45 volatile int chk_fail_ok;
  46 jmp_buf chk_fail_buf;
  47
  48 static void
  49 handler (int sig)
  50 {
  51   if (chk_fail_ok)
  52     {
  53       chk_fail_ok = 0;
  54       longjmp (chk_fail_buf, 1);
  55     }
  56   else
  57     _exit (127);
  58 }
  59
  60 typedef char *(*proto_t) (char *, const char *, size_t);
  61
  62 static void
  63 do_one_test (impl_t *impl, char *dst, const char *src,
  64              size_t len, size_t dlen)
  65 {
  66   char *res;
  67   size_t i, iters = INNER_LOOP_ITERS_LARGE;
  68   timing_t start, stop, cur;
  69
  70   if (dlen <= len)
  71     {
  72       if (impl->test == 1)
  73         return;
  74
  75       chk_fail_ok = 1;
  76       if (setjmp (chk_fail_buf) == 0)
  77         {
  78           res = CALL (impl, dst, src, dlen);
  79           printf ("*** Function %s (%zd; %zd) did not __chk_fail\n",
  80                   impl->name, len, dlen);
  81           chk_fail_ok = 0;
  82           ret = 1;
  83         }
  84       return;
  85     }
  86   else
  87     res = CALL (impl, dst, src, dlen);
  88
  89   if (res != STRCPY_RESULT (dst, len))
  90     {
  91       printf ("Wrong result in function %s %p %p\n", impl->name,
  92               res, STRCPY_RESULT (dst, len));
  93       ret = 1;
  94       return;
  95     }
  96
  97   if (strcmp (dst, src) != 0)
  98     {
  99       printf ("Wrong result in function %s dst \"%s\" src \"%s\"\n",
 100               impl->name, dst, src);
 101       ret = 1;
 102       return;
 103     }
 104
 105   TIMING_NOW (start);
 106   for (i = 0; i < iters; ++i)
 107     {
 108       CALL (impl, dst, src, dlen);
 109     }
 110   TIMING_NOW (stop);
 111
 112   TIMING_DIFF (cur, start, stop);
 113
 114   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 115 }
 116
 117 static void
 118 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 119 {
 120   size_t i;
 121   char *s1, *s2;
 122
 123   align1 &= 7;
 124   if (align1 + len >= page_size)
 125     return;
 126
 127   align2 &= 7;
 128   if (align2 + len >= page_size)
 129     return;
 130
 131   s1 = (char *) buf1 + align1;
 132   s2 = (char *) buf2 + align2;
 133
 134   for (i = 0; i < len; i++)
 135     s1[i] = 32 + 23 * i % (max_char - 32);
 136   s1[len] = 0;
 137
 138   if (dlen > len)
 139     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 140
 141   FOR_EACH_IMPL (impl, 0)
 142     do_one_test (impl, s2, s1, len, dlen);
 143
 144   if (dlen > len)
 145     putchar ('\n');
 146 }
 147
 148 static int
 149 test_main (void)
 150 {
 151   size_t i;
 152
 153   set_fortify_handler (handler);
 154
 155   test_init ();
 156
 157   printf ("%23s", "");
 158   FOR_EACH_IMPL (impl, 0)
 159     printf ("\t%s", impl->name);
 160   putchar ('\n');
 161
 162   for (i = 0; i < 16; ++i)
 163     {
 164       do_test (0, 0, i, i + 1, 127);
 165       do_test (0, 0, i, i + 1, 255);
 166       do_test (0, i, i, i + 1, 127);
 167       do_test (i, 0, i, i + 1, 255);
 168     }
 169
 170   for (i = 1; i < 8; ++i)
 171     {
 172       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 173       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 174     }
 175
 176   for (i = 1; i < 8; ++i)
 177     {
 178       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 179       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 180       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 181       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 182     }
 183
 184   for (i = 0; i < 16; ++i)
 185     {
 186       do_test (0, 0, i, i + 256, 127);
 187       do_test (0, 0, i, i + 256, 255);
 188       do_test (0, i, i, i + 256, 127);
 189       do_test (i, 0, i, i + 256, 255);
 190     }
 191
 192   for (i = 1; i < 8; ++i)
 193     {
 194       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 195       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 196     }
 197
 198   for (i = 1; i < 8; ++i)
 199     {
 200       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 201       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 202       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 203       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 204     }
 205
 206   for (i = 0; i < 16; ++i)
 207     {
 208       do_test (0, 0, i, i, 127);
 209       do_test (0, 0, i, i + 2, 255);
 210       do_test (0, i, i, i + 3, 127);
 211       do_test (i, 0, i, i + 4, 255);
 212     }
 213
 214   for (i = 1; i < 8; ++i)
 215     {
 216       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 217       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 218     }
 219
 220   for (i = 1; i < 8; ++i)
 221     {
 222       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 223       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 224       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 225       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 226     }
 227
 228   return 0;
 229 }
 230
 231 #include <support/test-driver.c>