Initial back-edge CFI implementation #3606
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This issue or pull request has been labeled: "cranelift", "cranelift:area:aarch64", "cranelift:area:machinst", "cranelift:area:x64", "cranelift:meta", "wasmtime:api"
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cfallin
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Jun 30, 2022
Give the user the option to sign and to authenticate function return addresses with the operations introduced by the Pointer Authentication extension to the Arm instruction set architecture. Copyright (c) 2021, Arm Limited.
cfallin
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Aug 3, 2022
This was referenced Aug 4, 2022
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This pull request is meant to illustrate the RFC proposal to improve control flow integrity for compiled WebAssembly code by using the Pointer Authentication extension to the Arm instruction set architecture (bytecodealliance/rfcs#17), so it is not in a shape to be merged yet. The generation of the unwinding information is a hack to make things work (i.e. pass the tests) before there is a resolution to gimli-rs/gimli#130 and gimli-rs/gimli#608.
P.S. Actually I apply another hack to test the code - I change the processor feature detection logic in
cranelift/native/src/lib.rs, so that the availability of PAuth is hardcoded (and there is no need to use a nightly toolchain). What you see here and what CI is testing is the clean code, though.P.P.S. The RFC proposal has now been merged, and the changes in this PR have been updated the reflect the final version of the proposal, so they are now ready. No hacks are necessary (and have been removed from the code), but on Linux unwinding through functions with signed return addresses will result in crashes unless the unwinder includes the fix discussed in issue #3183 (note that return address signing is not enabled by default).