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40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
```toml
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[advisory]
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id = "RUSTSEC-2020-0161"
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package = "array-macro"
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date = "2020-05-07"
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url = "https://gitlab.com/KonradBorowski/array-macro/-/commit/01940637dd8f3bfeeee3faf9639fa9ae52f19f4d"
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categories = ["memory-corruption"]
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informational = "unsound"
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aliases = ["GHSA-83gg-pwxf-jr89"]
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[versions]
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patched = [">= 1.0.5"]
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unaffected = ["< 0.1.2"]
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```
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# `array!` macro is unsound in presence of traits that implement methods it calls internally
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Affected versions of this crate called some methods using auto-ref. The affected code looked like this.
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```rust
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let mut arr = $crate::__core::mem::MaybeUninit::uninit();
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let mut vec = $crate::__ArrayVec::<T>::new(arr.as_mut_ptr() as *mut T);
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```
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In this case, the problem is that `as_mut_ptr` is a method of `&mut MaybeUninit`, not `MaybeUninit`. This made it possible for traits to hijack the method calls in order to cause unsoundness.
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```rust
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trait AsMutPtr<T> {
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fn as_mut_ptr(&self) -> *mut T;
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}
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impl<T> AsMutPtr<T> for std::mem::MaybeUninit<T> {
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fn as_mut_ptr(&self) -> *mut T {
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std::ptr::null_mut()
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}
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}
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array![0; 1];
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```
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The flaw was corrected by explicitly referencing variables in macro body in order to avoid auto-ref.
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