benchtests/bench-strcpy_chk.c

   1 /* Measure __strcpy_chk functions.
   2    Copyright (C) 2013 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 volatile int chk_fail_ok;
  57 jmp_buf chk_fail_buf;
  58
  59 static void
  60 handler (int sig)
  61 {
  62   if (chk_fail_ok)
  63     {
  64       chk_fail_ok = 0;
  65       longjmp (chk_fail_buf, 1);
  66     }
  67   else
  68     _exit (127);
  69 }
  70
  71 typedef char *(*proto_t) (char *, const char *, size_t);
  72
  73 static void
  74 do_one_test (impl_t *impl, char *dst, const char *src,
  75              size_t len, size_t dlen)
  76 {
  77   char *res;
  78   if (dlen <= len)
  79     {
  80       if (impl->test == 1)
  81         return;
  82
  83       chk_fail_ok = 1;
  84       if (setjmp (chk_fail_buf) == 0)
  85         {
  86           res = CALL (impl, dst, src, dlen);
  87           printf ("*** Function %s (%zd; %zd) did not __chk_fail\n",
  88                   impl->name, len, dlen);
  89           chk_fail_ok = 0;
  90           ret = 1;
  91         }
  92       return;
  93     }
  94   else
  95     res = CALL (impl, dst, src, dlen);
  96
  97   if (res != STRCPY_RESULT (dst, len))
  98     {
  99       printf ("Wrong result in function %s %p %p\n", impl->name,
 100               res, STRCPY_RESULT (dst, len));
 101       ret = 1;
 102       return;
 103     }
 104
 105   if (strcmp (dst, src) != 0)
 106     {
 107       printf ("Wrong result in function %s dst \"%s\" src \"%s\"\n",
 108               impl->name, dst, src);
 109       ret = 1;
 110       return;
 111     }
 112
 113   if (HP_TIMING_AVAIL)
 114     {
 115       hp_timing_t start __attribute ((unused));
 116       hp_timing_t stop __attribute ((unused));;
 117       hp_timing_t best_time = ~ (hp_timing_t) 0;
 118       size_t i;
 119
 120       for (i = 0; i < 32; ++i)
 121         {
 122           HP_TIMING_NOW (start);
 123           CALL (impl, dst, src, dlen);
 124           HP_TIMING_NOW (stop);
 125           HP_TIMING_BEST (best_time, start, stop);
 126         }
 127
 128       printf ("\t%zd", (size_t) best_time);
 129     }
 130 }
 131
 132 static void
 133 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 134 {
 135   size_t i;
 136   char *s1, *s2;
 137
 138   align1 &= 7;
 139   if (align1 + len >= page_size)
 140     return;
 141
 142   align2 &= 7;
 143   if (align2 + len >= page_size)
 144     return;
 145
 146   s1 = (char *) buf1 + align1;
 147   s2 = (char *) buf2 + align2;
 148
 149   for (i = 0; i < len; i++)
 150     s1[i] = 32 + 23 * i % (max_char - 32);
 151   s1[len] = 0;
 152
 153   if (HP_TIMING_AVAIL && dlen > len)
 154     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 155
 156   FOR_EACH_IMPL (impl, 0)
 157     do_one_test (impl, s2, s1, len, dlen);
 158
 159   if (HP_TIMING_AVAIL && dlen > len)
 160     putchar ('\n');
 161 }
 162
 163 int
 164 test_main (void)
 165 {
 166   size_t i;
 167
 168   struct sigaction sa;
 169   sa.sa_handler = handler;
 170   sa.sa_flags = 0;
 171   sigemptyset (&sa.sa_mask);
 172
 173   sigaction (SIGABRT, &sa, NULL);
 174
 175   /* Avoid all the buffer overflow messages on stderr.  */
 176   int fd = open (_PATH_DEVNULL, O_WRONLY);
 177   if (fd == -1)
 178     close (STDERR_FILENO);
 179   else
 180     {
 181       dup2 (fd, STDERR_FILENO);
 182       close (fd);
 183     }
 184   setenv ("LIBC_FATAL_STDERR_", "1", 1);
 185
 186   test_init ();
 187
 188   printf ("%23s", "");
 189   FOR_EACH_IMPL (impl, 0)
 190     printf ("\t%s", impl->name);
 191   putchar ('\n');
 192
 193   for (i = 0; i < 16; ++i)
 194     {
 195       do_test (0, 0, i, i + 1, 127);
 196       do_test (0, 0, i, i + 1, 255);
 197       do_test (0, i, i, i + 1, 127);
 198       do_test (i, 0, i, i + 1, 255);
 199     }
 200
 201   for (i = 1; i < 8; ++i)
 202     {
 203       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 204       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 205     }
 206
 207   for (i = 1; i < 8; ++i)
 208     {
 209       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 210       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 211       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 212       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 213     }
 214
 215   for (i = 0; i < 16; ++i)
 216     {
 217       do_test (0, 0, i, i + 256, 127);
 218       do_test (0, 0, i, i + 256, 255);
 219       do_test (0, i, i, i + 256, 127);
 220       do_test (i, 0, i, i + 256, 255);
 221     }
 222
 223   for (i = 1; i < 8; ++i)
 224     {
 225       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 226       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 227     }
 228
 229   for (i = 1; i < 8; ++i)
 230     {
 231       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 232       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 233       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 234       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 235     }
 236
 237   for (i = 0; i < 16; ++i)
 238     {
 239       do_test (0, 0, i, i, 127);
 240       do_test (0, 0, i, i + 2, 255);
 241       do_test (0, i, i, i + 3, 127);
 242       do_test (i, 0, i, i + 4, 255);
 243     }
 244
 245   for (i = 1; i < 8; ++i)
 246     {
 247       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 248       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 249     }
 250
 251   for (i = 1; i < 8; ++i)
 252     {
 253       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 254       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 255       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 256       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 257     }
 258
 259   return 0;
 260 }
 261
 262 #include "../test-skeleton.c"