benchtests/bench-strcpy_chk.c

   1 /* Measure __strcpy_chk functions.
   2    Copyright (C) 2013-2021 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 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 #include <support/support.h>
  57
  58 volatile int chk_fail_ok;
  59 jmp_buf chk_fail_buf;
  60
  61 static void
  62 handler (int sig)
  63 {
  64   if (chk_fail_ok)
  65     {
  66       chk_fail_ok = 0;
  67       longjmp (chk_fail_buf, 1);
  68     }
  69   else
  70     _exit (127);
  71 }
  72
  73 typedef char *(*proto_t) (char *, const char *, size_t);
  74
  75 static void
  76 do_one_test (impl_t *impl, char *dst, const char *src,
  77              size_t len, size_t dlen)
  78 {
  79   char *res;
  80   size_t i, iters = INNER_LOOP_ITERS8;
  81   timing_t start, stop, cur;
  82
  83   if (dlen <= len)
  84     {
  85       if (impl->test == 1)
  86         return;
  87
  88       chk_fail_ok = 1;
  89       if (setjmp (chk_fail_buf) == 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   TIMING_NOW (start);
 119   for (i = 0; i < iters; ++i)
 120     {
 121       CALL (impl, dst, src, dlen);
 122     }
 123   TIMING_NOW (stop);
 124
 125   TIMING_DIFF (cur, start, stop);
 126
 127   TIMING_PRINT_MEAN ((double) cur, (double) iters);
 128 }
 129
 130 static void
 131 do_test (size_t align1, size_t align2, size_t len, size_t dlen, int max_char)
 132 {
 133   size_t i;
 134   char *s1, *s2;
 135
 136   align1 &= 7;
 137   if (align1 + len >= page_size)
 138     return;
 139
 140   align2 &= 7;
 141   if (align2 + len >= page_size)
 142     return;
 143
 144   s1 = (char *) buf1 + align1;
 145   s2 = (char *) buf2 + align2;
 146
 147   for (i = 0; i < len; i++)
 148     s1[i] = 32 + 23 * i % (max_char - 32);
 149   s1[len] = 0;
 150
 151   if (dlen > len)
 152     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 153
 154   FOR_EACH_IMPL (impl, 0)
 155     do_one_test (impl, s2, s1, len, dlen);
 156
 157   if (dlen > len)
 158     putchar ('\n');
 159 }
 160
 161 static int
 162 test_main (void)
 163 {
 164   size_t i;
 165
 166   set_fortify_handler (handler);
 167
 168   test_init ();
 169
 170   printf ("%23s", "");
 171   FOR_EACH_IMPL (impl, 0)
 172     printf ("\t%s", impl->name);
 173   putchar ('\n');
 174
 175   for (i = 0; i < 16; ++i)
 176     {
 177       do_test (0, 0, i, i + 1, 127);
 178       do_test (0, 0, i, i + 1, 255);
 179       do_test (0, i, i, i + 1, 127);
 180       do_test (i, 0, i, i + 1, 255);
 181     }
 182
 183   for (i = 1; i < 8; ++i)
 184     {
 185       do_test (0, 0, 8 << i, (8 << i) + 1, 127);
 186       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 1, 127);
 187     }
 188
 189   for (i = 1; i < 8; ++i)
 190     {
 191       do_test (i, 2 * i, (8 << i), (8 << i) + 1, 127);
 192       do_test (2 * i, i, (8 << i), (8 << i) + 1, 255);
 193       do_test (i, i, (8 << i), (8 << i) + 1, 127);
 194       do_test (i, i, (8 << i), (8 << i) + 1, 255);
 195     }
 196
 197   for (i = 0; i < 16; ++i)
 198     {
 199       do_test (0, 0, i, i + 256, 127);
 200       do_test (0, 0, i, i + 256, 255);
 201       do_test (0, i, i, i + 256, 127);
 202       do_test (i, 0, i, i + 256, 255);
 203     }
 204
 205   for (i = 1; i < 8; ++i)
 206     {
 207       do_test (0, 0, 8 << i, (8 << i) + 256, 127);
 208       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 256, 127);
 209     }
 210
 211   for (i = 1; i < 8; ++i)
 212     {
 213       do_test (i, 2 * i, (8 << i), (8 << i) + 256, 127);
 214       do_test (2 * i, i, (8 << i), (8 << i) + 256, 255);
 215       do_test (i, i, (8 << i), (8 << i) + 256, 127);
 216       do_test (i, i, (8 << i), (8 << i) + 256, 255);
 217     }
 218
 219   for (i = 0; i < 16; ++i)
 220     {
 221       do_test (0, 0, i, i, 127);
 222       do_test (0, 0, i, i + 2, 255);
 223       do_test (0, i, i, i + 3, 127);
 224       do_test (i, 0, i, i + 4, 255);
 225     }
 226
 227   for (i = 1; i < 8; ++i)
 228     {
 229       do_test (0, 0, 8 << i, (8 << i) - 15, 127);
 230       do_test (8 - i, 2 * i, (8 << i), (8 << i) + 5, 127);
 231     }
 232
 233   for (i = 1; i < 8; ++i)
 234     {
 235       do_test (i, 2 * i, (8 << i), (8 << i) + i, 127);
 236       do_test (2 * i, i, (8 << i), (8 << i) + (i - 1), 255);
 237       do_test (i, i, (8 << i), (8 << i) + i + 2, 127);
 238       do_test (i, i, (8 << i), (8 << i) + i + 3, 255);
 239     }
 240
 241   return 0;
 242 }
 243
 244 #include <support/test-driver.c>