As in the address 0?
WebAssembly lets applications write/read to NULL. Even if, by design, WASM prevents whole classes of vulnerabilities, that sounds like a regression over what all modern operating systems do, which has proven to prevent many bugs and exploitable vulnerabilities.
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Yes. Sure, the C standard allows (void*)0 to represent a different address, but in practice no compiler ever did that, and that would break quite a lot of code.
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