View difference between Paste ID: Fus1b46S and 4617Uhdh

-.section .data
+#include <stdio.h>
-message:
+#include <fcntl.h>
-    .ascii "Hola Mundo\n"
+#include <sys/mman.h>
-    len = . - message
+#include <sys/types.h>
 #include <unistd.h>
-.section .text
+#include <stdlib.h>
-.globl _start
+#include <assert.h>
-_start:
+
-    #write mesaje to stdout
+/* Shellcode testbed
-    movl $len, %edx              # LEN
+ *
-    movl $message, %ecx          # BUFFER
+ * man mmap:
-    movl $1, %ebx                # FD
+ *  mmap()  creates a new mapping in the virtual address space of the call-
-    movl $4, %eax                # WRITE
+ *          ing process.  The starting address for the new mapping is specified
-    int $0x80                    # SYSCALL
+ *          in addr.  The length argument specifies the length of the mapping.
-    #exit
+ *
-    movl $0, %ebx                # RETVALUE
+ * */
-    movl $1, %eax                # EXIT
+int
-    int $0x80                    # SYSCALL
+main (int argc, char *argv[])
 {
     void *p;
     int fd;
     off_t size;
 
     if (argc != 2)
       {
 	  printf ("Usage:\n\t%s shellcode.bin\n", argv[0]);
 	  exit (-1);
       }
 
 //Open tha file
     fd= open (argv[1], O_RDONLY);
     assert ( fd != -1);
 //Read the size
     size = lseek (fd, 0, SEEK_END);
     lseek (fd, 0, SEEK_SET);
     assert ( size != 0);
 //Allocates a virtual memory map RWX
     p = mmap (NULL, size, PROT_EXEC | PROT_READ | PROT_WRITE,
 	      MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     printf ("Memory@%p\n", p);
 
 //Reads content of the "binary" file into mem
     assert(size == read (fd, p, size));
 
 //Close the file so the shellcode inherits only 0,1,2
     close (fd);
 
 //Call the first instruction in mem
     printf ("Passing control to the shellcode...\n");
     ((void (*)()) p) ();
     printf ("The shellcode has returned to main!\n");
     exit (-1);
 }