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

@@ -0,0 +1,12 @@
+.DEFAULT_GOAL := all
+
+shellcode: shellcode.asm
+	nasm -felf32 shellcode.asm -o shellcode.o
+	ld -m elf_i386 shellcode.o -o shellcode
+	rm shellcode.o
+
+test: test_shellcode.c
+	gcc -o test_shellcode -m32 -fno-stack-protector -z execstack -fno-pie -O0 test_shellcode.c
+
+
+all: shellcode test

Assignment 5 - Software Security - Teil 1/shellcode/shellcode.asm

@@ -0,0 +1,8 @@
+
+; SHELLCODE: "\x90\x90\x90..."
+
+global _start
+_start:
+    ;----------------------------------
+    nop; <YOUR CODE HERE>
+    ; ------------ End of file ------------ 

Assignment 5 - Software Security - Teil 1/shellcode/test_shellcode.c

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+#include <stdio.h>
+#include <string.h>
+
+// gcc -o test_shellcode -m32 -fno-stack-protector -fno-pie -z execstack -O0 test_shellcode.c
+
+// Your shellcode goes here
+char *shellcode = "\x90\x90\x90...";
+// ------------------------
+
+int main()
+{
+    // Print length of shellcode
+    fprintf(stdout,"Length: %d\n",strlen(shellcode));
+    // Execute shellcode
+    (*(void  (*)()) shellcode)();
+}