[Assignment-5] added solution task 3 (shellcode)

Assignment 5 - Software Security - Teil 1/shellcode/exploit

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# assemble shellcode
+nasm -felf32 shellcode.asm -o x.o && ld -m elf_i386 x.o -o shellcode &> /dev/null
+
+# remove object file
+rm x.o
+
+# extract shellcode and remove binary
+shellcode=$(for byte in $(objdump -d ./shellcode | grep "^ " | cut -f2); do echo -n '\x'$byte; done)
+rm shellcode
+
+# TODO place shellcode into test_shellcode.c and shellcode.asm
+
+# compile test_shellcode.c and execute it afterwards
+gcc -o test_shellcode -m32 -fno-stack-protector -fno-pie -z execstack -O0 test_shellcode.c && ./test_shellcode