Crashing Safe Rust code with OS help

rustsafecrash.rs

// This code demonstrates that with OS's external help
// one can crash even Safe Rust's code

// Implemented by Vitaly "_Vi" Shukela

use std::process::Command;

fn getpid() -> i32 {
    let so = Command::new("sh")
                 .arg("-c")
                 .arg("cat /proc/$$/status | grep PPid: | awk '{print $2}'")
                 .output()
                 .unwrap()
                 .stdout;
    String::from_utf8(so).unwrap().trim().parse().unwrap()
}

fn hacky_ptr_write<T>(pointer: &T, value: u32) {
    Command::new("gdb")
        .arg("-batch").arg("-quiet")
        .arg("-pid").arg(format!("{}", getpid()))
        .arg("-ex")
        .arg(format!("set {{unsigned long}}{:p} = {}", pointer, value))
        .output()
        .unwrap();
}


fn main() {
    let mut q = &mut Box::new(55);

    hacky_ptr_write(&q, 0);

    *q = Box::new(44); // SEGV
}