Double drop of file descriptor

[zhaozihanzzh]

I'm running another project which is based on Quark with newer version of Rust toolchain. The following lines in qvisor/src/runc/runtime/sandbox_process.rs crashes with the output fatal runtime error: IO Safety violation: owned file descriptor already closed:

            unsafe {
                let tty = slave.dup()?;
                cmd.stdin(Stdio::from_raw_fd(tty));
                cmd.stdout(Stdio::from_raw_fd(tty));
                cmd.stderr(Stdio::from_raw_fd(tty));
            }

I have changed them to the following lines to solve this problem:

            unsafe {
                let tty_file = File::from_raw_fd(slave.dup()?);
                cmd.stdin(Stdio::from(tty_file.try_clone().map_err(|_| Error::SysError(-(errno::errno().0 as i32)))?));
                cmd.stdout(Stdio::from(tty_file.try_clone().map_err(|_| Error::SysError(-(errno::errno().0 as i32)))?));
                cmd.stderr(Stdio::from(tty_file));
            }