Struct Guard 

pub struct Guard {
    pub segment: Segment,
    pub at: i32,
    pub fail: &'static str,
}

Where a target keeps the word a stack protector’s canary is a copy of.

Not a register and not a symbol either, on the conventions here. The word is in the block a thread has to itself, which is reached through a segment register and no other way, so the only way to name it is a distance into that block. That is why %fs:40 appears in every protected function glibc has ever linked and why no object file carries a relocation for it.

A convention that answers None is one this compiler has no protector for, and a command line that asks for one on such a target is told so rather than quietly given an unprotected frame.

Fields

segment: Segment

The storage the word is in.

at: i32

How far into it the word is.

fail: &'static str

The function called when the copy in the frame no longer matches it, which does not come back.

Trait Implementations

impl Clone for Guard

fn clone(&self) -> Guard

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Guard

impl Debug for Guard

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Guard

impl PartialEq for Guard

fn eq(&self, other: &Guard) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Guard