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License: Apache License 2.0
A Rust library providing a stack-like memory allocator with double-ended allocation support.
License: Apache License 2.0
Hello,
we (Rust group @sslab-gatech) found a memory-safety/soundness issue in this crate while scanning Rust code on crates.io for potential vulnerabilities.
Two functions allow double-drop of an object upon panic: <T as traits::SliceMoveSource<[<T as traits::Array>::Item]>>::move_elements()
, <std::boxed::Box<T> as traits::SliceMoveSource<T>>::move_elements()
. Both functions take user-provided closure as parameter, and a double drop of an object happens upon panic inside the user-provided closure.
Below is an example program that exhibits undefined behavior using safe APIs of scratchpad
.
struct Foo
is dropped twice upon panic in user-provided closure.
#![forbid(unsafe_code)]
use scratchpad::SliceLike;
use scratchpad::SliceMoveSource;
#[derive(Clone, Debug)]
struct Foo(i32);
impl Drop for Foo {
fn drop(&mut self) {
// This message is printed twice, indicating double-free.
println!("I'm dropping {}", self.0);
}
}
fn main() {
let mut mybox = [Foo(1234); 1];
mybox.move_elements(|s| {
panic!("Unexpected panic");
dbg!(s);
});
}
Output:
thread 'main' panicked at 'Unexpected panic', src/main.rs:33:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
I'm dropping 1234
I'm dropping 1234
Return code 101
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