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+Shellcodes are raw machine instructions executed directly by the CPU, so they must match the specific instruction set architecture.
+To spawn a shell the shellcode has to make system calls to the kernel.
+Because syscall numbers and the CPU registers used to pass arguments vary entirely between different operating systems and architectures, a shellcode written for 32-bit Linux will not work on 64-bit Linux or Windows.
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diff --git a/sheet07/a1/f.txt b/sheet07/a1/f.txt
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+ASLR randomizes the base addresses of memory segments like the stack and shared libraries on every execution.
+To defeat it an information leak vulnerability is usually required to read a valid memory address at runtime.
+Since ASLR only shifts the memory regions as a whole, the relative offsets between functions remain constant.
+By leaking a single pointer the base address can be calculated, which allows computing the exact runtime location of the target function or ROP gadgets.
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