Описание
bumpalo has use-after-free due to a lifetime error in Vec::into_iter()
In affected versions of this crate, the lifetime of the iterator produced by Vec::into_iter() is not constrained to the lifetime of the Bump that allocated the vector's memory. Using the iterator after the Bump is dropped causes use-after-free accesses.
The following example demonstrates memory corruption arising from a misuse of this unsoundness.
use bumpalo::{collections::Vec, Bump};
fn main() {
let bump = Bump::new();
let mut vec = Vec::new_in(&bump);
vec.extend([0x01u8; 32]);
let into_iter = vec.into_iter();
drop(bump);
for _ in 0..100 {
let reuse_bump = Bump::new();
let _reuse_alloc = reuse_bump.alloc([0x41u8; 10]);
}
for x in into_iter {
print!("0x{:02x} ", x);
}
println!();
}
The issue was corrected in version 3.11.1 by adding a lifetime to the IntoIter type, and updating the signature of Vec::into_iter() to constrain this lifetime.
Пакеты
Наименование
bumpalo
rust
Затронутые версииВерсия исправления
>= 1.1.0, < 3.11.1
3.11.1