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21 lines
1.2 KiB
Markdown
21 lines
1.2 KiB
Markdown
```toml
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[advisory]
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id = "RUSTSEC-2023-0045"
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package = "memoffset"
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date = "2023-06-21"
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url = "https://github.com/Gilnaa/memoffset/issues/24"
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informational = "unsound"
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categories = ["memory-corruption"]
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keywords = ["memoffset", "offset"]
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aliases = ["GHSA-wfg4-322g-9vqv"]
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[affected]
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functions = { "memoffset::offset_of" = ["< 0.6.2"] }
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[versions]
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patched = [">= 0.6.2"]
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```
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# memoffset allows reading uninitialized memory
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memoffset allows attempt of reading data from address `0` with arbitrary type. This behavior is an undefined behavior because address `0` to `std::mem::size_of<T>` may not have valid bit-pattern with `T`. Old implementation dereferences uninitialized memory obtained from `std::mem::align_of`. Older implementation prior to it allows using uninitialized data obtained from `std::mem::uninitialized` with arbitrary type then compute offset by taking the address of field-projection. This may also result in an undefined behavior for "father" that includes (directly or transitively) type that [does not allow to be uninitialized](https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html).
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This flaw was corrected by using `std::ptr::addr_of` in <https://github.com/Gilnaa/memoffset/pull/50>.
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