Add `-Zsanitizer=kernel-hwaddress`

[Darksonn]

Proposal

Add a new sanitizer called -Zsanitizer=kernel-hwaddress for bare metal aarch64 targets. It should behave the same as the -fsanitize=kernel-hwaddress sanitizer in clang.

The actual sanitizer is implemented as an LLVM pass. Rustc should not need any special logic other than tell LLVM to run the hwaddress pass in kernel mode.

I've already opened a PR with an implementation: rust-lang/rust#153049

Process

The main points of the Major Change Process are as follows:

• File an issue describing the proposal.
• A compiler team member who is knowledgeable in the area can second by writing @rustbot second or kickoff a team FCP with @rfcbot fcp $RESOLUTION.
  • Refer to Proposals, Approvals and Stabilization docs for when a second is sufficient, or when a full team FCP is required.
• Once an MCP is seconded, the Final Comment Period begins.
  • Final Comment Period lasts for 10 days after all outstanding concerns are solved.
  • Outstanding concerns will block the Final Comment Period from finishing. Once all concerns are resolved, the 10 day countdown is restarted.
  • If no concerns are raised after 10 days since the resolution of the last outstanding concern, the MCP is considered approved.

You can read more about Major Change Proposals on forge.

[rustbot]

Important

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cc @rust-lang/compiler

[mati865]

@rustbot second