benchtests/bench-strcpy_chk.c

   1 /* Measure __strcpy_chk functions.
   2    Copyright (C) 2013-2014 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   size_t i, iters = INNER_LOOP_ITERS;
  79   timing_t start, stop, cur;
  80
  81   if (dlen <= len)
  82     {
  83       if (impl->test == 1)
  84         return;
  85
  86       chk_fail_ok = 1;
  87       if (setjmp (chk_fail_buf) == 0)
  88         {
  89           res = CALL (impl, dst, src, dlen);
  90           printf ("*** Function %s (%zd; %zd) did not __chk_fail\n",
  91                   impl->name, len, dlen);
  92           chk_fail_ok = 0;
  93           ret = 1;
  94         }
  95       return;
  96     }
  97   else
  98     res = CALL (impl, dst, src, dlen);
  99
 100   if (res != STRCPY_RESULT (dst, len))
 101     {
 102       printf ("Wrong result in function %s %p %p\n", impl->name,
 103               res, STRCPY_RESULT (dst, len));
 104       ret = 1;
 105       return;
 106     }
 107
 108   if (strcmp (dst, src) != 0)
 109     {
 110       printf ("Wrong result in function %s dst \"%s\" src \"%s\"\n",
 111               impl->name, dst, src);
 112       ret = 1;
 113       return;
 114     }
 115
 116   TIMING_NOW (start);
 117   for (i = 0; i < iters; ++i)
 118     {
 119       CALL (impl, dst, src, dlen);
 120     }
 121   TIMING_NOW (stop);
 122
 123   TIMING_DIFF (cur, start, stop);
 124
 125   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 126 }
 127
 128 static void
 129 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 130 {
 131   size_t i;
 132   char *s1, *s2;
 133
 134   align1 &= 7;
 135   if (align1 + len >= page_size)
 136     return;
 137
 138   align2 &= 7;
 139   if (align2 + len >= page_size)
 140     return;
 141
 142   s1 = (char *) buf1 + align1;
 143   s2 = (char *) buf2 + align2;
 144
 145   for (i = 0; i < len; i++)
 146     s1[i] = 32 + 23 * i % (max_char - 32);
 147   s1[len] = 0;
 148
 149   if (dlen > len)
 150     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 151
 152   FOR_EACH_IMPL (impl, 0)
 153     do_one_test (impl, s2, s1, len, dlen);
 154
 155   if (dlen > len)
 156     putchar ('\n');
 157 }
 158
 159 int
 160 test_main (void)
 161 {
 162   size_t i;
 163
 164   struct sigaction sa;
 165   sa.sa_handler = handler;
 166   sa.sa_flags = 0;
 167   sigemptyset (&sa.sa_mask);
 168
 169   sigaction (SIGABRT, &sa, NULL);
 170
 171   /* Avoid all the buffer overflow messages on stderr.  */
 172   int fd = open (_PATH_DEVNULL, O_WRONLY);
 173   if (fd == -1)
 174     close (STDERR_FILENO);
 175   else
 176     {
 177       dup2 (fd, STDERR_FILENO);
 178       close (fd);
 179     }
 180   setenv ("LIBC_FATAL_STDERR_", "1", 1);
 181
 182   test_init ();
 183
 184   printf ("%23s", "");
 185   FOR_EACH_IMPL (impl, 0)
 186     printf ("\t%s", impl->name);
 187   putchar ('\n');
 188
 189   for (i = 0; i < 16; ++i)
 190     {
 191       do_test (0, 0, i, i + 1, 127);
 192       do_test (0, 0, i, i + 1, 255);
 193       do_test (0, i, i, i + 1, 127);
 194       do_test (i, 0, i, i + 1, 255);
 195     }
 196
 197   for (i = 1; i < 8; ++i)
 198     {
 199       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 200       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 201     }
 202
 203   for (i = 1; i < 8; ++i)
 204     {
 205       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 206       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 207       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 208       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 209     }
 210
 211   for (i = 0; i < 16; ++i)
 212     {
 213       do_test (0, 0, i, i + 256, 127);
 214       do_test (0, 0, i, i + 256, 255);
 215       do_test (0, i, i, i + 256, 127);
 216       do_test (i, 0, i, i + 256, 255);
 217     }
 218
 219   for (i = 1; i < 8; ++i)
 220     {
 221       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 222       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 223     }
 224
 225   for (i = 1; i < 8; ++i)
 226     {
 227       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 228       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 229       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 230       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 231     }
 232
 233   for (i = 0; i < 16; ++i)
 234     {
 235       do_test (0, 0, i, i, 127);
 236       do_test (0, 0, i, i + 2, 255);
 237       do_test (0, i, i, i + 3, 127);
 238       do_test (i, 0, i, i + 4, 255);
 239     }
 240
 241   for (i = 1; i < 8; ++i)
 242     {
 243       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 244       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 245     }
 246
 247   for (i = 1; i < 8; ++i)
 248     {
 249       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 250       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 251       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 252       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 253     }
 254
 255   return 0;
 256 }
 257
 258 #include "../test-skeleton.c"