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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2020 Keith Packard
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <stdbool.h>
#include <ssp/ssp.h>
#ifdef TESTS_ENABLE_STACK_PROTECTOR
static volatile bool expect_smash;
static void __attribute__((noinline))
#ifdef __HAVE_CC_INHIBIT_LOOP_TO_LIBCALL
__attribute((__optimize__("-fno-tree-loop-distribute-patterns")))
#endif
my_strcpy(char *d, char *s)
{
while ((*d++ = *s++))
;
}
static void __attribute__((noinline))
smash_array(char *source, char *dest)
{
char local[48];
my_strcpy(local, source);
local[0]++;
my_strcpy(dest, local);
}
void
__stack_chk_fail(void)
{
if (expect_smash) {
puts("caught expected stack smash");
_exit(0);
} else {
puts("caught unexpected stack smash");
_exit(1);
}
}
int
main(void)
{
char source[64];
char dest[64];
memset(source, 'x', 15);
source[15] = '\0';
expect_smash = false;
smash_array(source, dest);
expect_smash = false;
printf("short source %s dest %s\n", source, dest);
memset(source, 'x', 63);
source[63] = '\0';
expect_smash = true;
smash_array(source, dest);
expect_smash = false;
printf("missed expected stack smash\n");
return 1;
}
#else
int
main(void)
{
printf("stack protector disabled for tests\n");
return 0;
}
#endif
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