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Auto merge of #95548 - rcvalle:rust-cfi-2, r=nagisa

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Add fine-grained LLVM CFI support to the Rust compiler

This PR improves the LLVM Control Flow Integrity (CFI) support in the Rust compiler by providing forward-edge control flow protection for Rust-compiled code only by aggregating function pointers in groups identified by their return and parameter types.

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 https://github.com/rust-lang/rust/issues/89653).

LLVM CFI can be enabled with -Zsanitizer=cfi and requires LTO (i.e., -Clto).

Thank you again, `@eddyb,` `@nagisa,` `@pcc,` and `@tmiasko` for all the help!
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bors 2022-07-24 01:22:36 +00:00
commit db8086eb60
25 changed files with 1731 additions and 164 deletions
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@ -4519,6 +4519,7 @@ dependencies = [
name = "rustc_symbol_mangling"
version = "0.0.0"
dependencies = [
"bitflags",
"punycode",
"rustc-demangle",
"rustc_data_structures",