benchtests/bench-strcpy_chk.c

   1 /* Measure __strcpy_chk functions.
   2    Copyright (C) 2013-2015 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    <http://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 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 #include "../test-skeleton.c"
  58
  59 volatile int chk_fail_ok;
  60 jmp_buf chk_fail_buf;
  61
  62 static void
  63 handler (int sig)
  64 {
  65   if (chk_fail_ok)
  66     {
  67       chk_fail_ok = 0;
  68       longjmp (chk_fail_buf, 1);
  69     }
  70   else
  71     _exit (127);
  72 }
  73
  74 typedef char *(*proto_t) (char *, const char *, size_t);
  75
  76 static void
  77 do_one_test (impl_t *impl, char *dst, const char *src,
  78              size_t len, size_t dlen)
  79 {
  80   char *res;
  81   size_t i, iters = INNER_LOOP_ITERS;
  82   timing_t start, stop, cur;
  83
  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   TIMING_NOW (start);
 120   for (i = 0; i < iters; ++i)
 121     {
 122       CALL (impl, dst, src, dlen);
 123     }
 124   TIMING_NOW (stop);
 125
 126   TIMING_DIFF (cur, start, stop);
 127
 128   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 129 }
 130
 131 static void
 132 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 133 {
 134   size_t i;
 135   char *s1, *s2;
 136
 137   align1 &= 7;
 138   if (align1 + len >= page_size)
 139     return;
 140
 141   align2 &= 7;
 142   if (align2 + len >= page_size)
 143     return;
 144
 145   s1 = (char *) buf1 + align1;
 146   s2 = (char *) buf2 + align2;
 147
 148   for (i = 0; i < len; i++)
 149     s1[i] = 32 + 23 * i % (max_char - 32);
 150   s1[len] = 0;
 151
 152   if (dlen > len)
 153     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 154
 155   FOR_EACH_IMPL (impl, 0)
 156     do_one_test (impl, s2, s1, len, dlen);
 157
 158   if (dlen > len)
 159     putchar ('\n');
 160 }
 161
 162 static int
 163 test_main (void)
 164 {
 165   size_t i;
 166
 167   set_fortify_handler (handler);
 168
 169   test_init ();
 170
 171   printf ("%23s", "");
 172   FOR_EACH_IMPL (impl, 0)
 173     printf ("\t%s", impl->name);
 174   putchar ('\n');
 175
 176   for (i = 0; i < 16; ++i)
 177     {
 178       do_test (0, 0, i, i + 1, 127);
 179       do_test (0, 0, i, i + 1, 255);
 180       do_test (0, i, i, i + 1, 127);
 181       do_test (i, 0, i, i + 1, 255);
 182     }
 183
 184   for (i = 1; i < 8; ++i)
 185     {
 186       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 187       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 188     }
 189
 190   for (i = 1; i < 8; ++i)
 191     {
 192       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 193       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 194       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 195       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 196     }
 197
 198   for (i = 0; i < 16; ++i)
 199     {
 200       do_test (0, 0, i, i + 256, 127);
 201       do_test (0, 0, i, i + 256, 255);
 202       do_test (0, i, i, i + 256, 127);
 203       do_test (i, 0, i, i + 256, 255);
 204     }
 205
 206   for (i = 1; i < 8; ++i)
 207     {
 208       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 209       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 210     }
 211
 212   for (i = 1; i < 8; ++i)
 213     {
 214       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 215       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 216       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 217       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 218     }
 219
 220   for (i = 0; i < 16; ++i)
 221     {
 222       do_test (0, 0, i, i, 127);
 223       do_test (0, 0, i, i + 2, 255);
 224       do_test (0, i, i, i + 3, 127);
 225       do_test (i, 0, i, i + 4, 255);
 226     }
 227
 228   for (i = 1; i < 8; ++i)
 229     {
 230       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 231       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 232     }
 233
 234   for (i = 1; i < 8; ++i)
 235     {
 236       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 237       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 238       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 239       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 240     }
 241
 242   return 0;
 243 }