Is this valid C code?

char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 };

main ()
{
void (*f)() = x;
f();
}

Found this on the Everything2 page for the Pentium F00F bug. My question is essentially whether it is indeed valid to write machine code subroutines as byte arrays and call them via a function pointer. Does the Standard have anything to say about this? And is executing code in the data segment even possible on modern architectures?

>>17

sounds in space is a convention

Convention? By whom? Shitty movie makers? What else do you think is a convention, laser cannons and plasma blasters in space? Real sci-fi novels have real space weapons like railguns, artillery and cluster bombs.