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Rollup merge of #105109 - rcvalle:rust-kcfi, r=bjorn3

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Add LLVM KCFI support to the Rust compiler

This PR adds LLVM Kernel Control Flow Integrity (KCFI) support to the Rust compiler. It initially provides forward-edge control flow protection for operating systems kernels for Rust-compiled code only by aggregating function pointers in groups identified by their return and parameter types. (See llvm/llvm-project@cff5bef.)

Forward-edge control flow protection for C or C++ and Rust -compiled code "mixed binaries" (i.e., for when C or C++ and Rust -compiled code share the same virtual address space) will be provided in later work as part of this project by identifying C char and integer type uses at the time types are encoded (see Type metadata in the design document in the tracking issue #89653).

LLVM KCFI can be enabled with -Zsanitizer=kcfi.

Thank you again, `@bjorn3,` `@eddyb,` `@nagisa,` and `@ojeda,` for all the help!
This commit is contained in:
Matthias Krüger 2022-12-10 09:24:43 +01:00 • committed by GitHub
commit 947fe7e341
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27 changed files with 261 additions and 28 deletions
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2
compiler/rustc_feature/src/builtin_attrs.rs
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@ -394,7 +394,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
ungated!(instruction_set, Normal, template!(List: "set"), ErrorPreceding),
gated!(
no_sanitize, Normal,
template!(List: "address, memory, thread"), DuplicatesOk,
template!(List: "address, kcfi, memory, thread"), DuplicatesOk,
experimental!(no_sanitize)
),
gated!(no_coverage, Normal, template!(Word), WarnFollowing, experimental!(no_coverage)),