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This adds a memory sanitizer to our CI in addition to address sanitizers.

@Alexhuszagh Alexhuszagh added the A-sec Related to unsoundness/security issues. label Oct 31, 2024
@Alexhuszagh Alexhuszagh self-assigned this Oct 31, 2024
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This is pending issues where the memory sanitizer seems to not compile nicely with recent versions of Rust.

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It seems like memsan hasn't been supported by the Rust standard library for nearly 4 years:
rust-fuzz/cargo-fuzz#243
rust-lang/rust#79382

Any workarounds require using very old versions of either cargo-fuzz or the nightly compiler, which are unlikely to support necessary features or require excessive workarounds.

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