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Add advisory for multiple issues in cgc #839

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Mar 26, 2021
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Add advisory for multiple issues in cgc #839

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25 changes: 25 additions & 0 deletions crates/cgc/RUSTSEC-0000-0000.md
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "cgc"
date = "2020-12-10"
url = "https://github.com/playXE/cgc/issues/5"
categories = ["memory-corruption"]
keywords = ["memory-safety", "aliasing", "concurrency"]

[versions]
patched = []
```

# Multiple soundness issues in `Ptr`

Affected versions of this crate have the following issues:

1. `Ptr` implements `Send` and `Sync` for all types, this can lead to data
races by sending non-thread safe types across threads.

2. `Ptr::get` violates mutable alias rules by returning multiple mutable
references to the same object.

3. `Ptr::write` uses non-atomic writes to the underlying pointer. This means
that when used across threads it can lead to data races.