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#include <stdio.h>
#include <string.h>
#include <unistd.h>
void caller(void (*trampoline)())
{
puts("Attempting to call a trampoline...");
trampoline();
}
void do_trampoline()
{
void nested()
{
puts("Succeeded.");
}
caller(nested);
}
void do_exploit()
{
puts("Attempting to simulate a buffer overflow exploit...");
#ifdef __i386__
__asm__ __volatile__(
"movl $1f,%%eax\n\t"
".byte 0x68; popl %%ecx; jmp *%%eax; nop\n\t"
"pushl %%esp\n\t"
"ret\n\t"
"1:"
: : : "ax", "cx");
#else
#error Wrong architecture
#endif
puts("Succeeded.");
}
#define USAGE \
"Usage: %s OPTION\n" \
"Non-executable user stack area tests\n\n" \
" -t\tcall a GCC trampoline\n" \
" -e\tsimulate a buffer overflow exploit\n" \
" -b\tsimulate an exploit after a trampoline call\n"
void usage(char *name)
{
printf(USAGE, name ? name : "stacktest");
exit(1);
}
int main(int argc, char **argv)
{
if (argc != 2) usage(argv[0]);
if (argv[1][0] != '-' || strlen(argv[1]) != 2) usage(argv[0]);
switch (argv[1][1]) {
case 't':
do_trampoline();
break;
case 'b':
do_trampoline();
case 'e':
do_exploit();
break;
default:
usage(argv[0]);
}
return 0;
}
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