Function clear_on_drop::clear_stack_on_return

pub fn clear_stack_on_return<F, R>(pages: usize, f: F) -> R where
    F: FnMut() -> R, 

Calls a closure and overwrites its stack on return.

This function calls clear_stack after calling the passed closure, taking care to prevent either of them being inlined, so the stack used by the closure will be overwritten with zeros (as long as a large enough number of pages is used).

For technical reasons, this function can be used only with Fn or FnMut. If all you have is a FnOnce, use the auxiliary function clear_stack_on_return_fnonce instead.

Example

let input = b"abc";
let result = clear_stack_on_return(1, || encrypt(input));