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Auto merge of #89652 - rcvalle:rust-cfi, r=nagisa

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Add LLVM CFI support to the Rust compiler

This PR adds LLVM Control Flow Integrity (CFI) support to the Rust compiler. It initially provides forward-edge control flow protection for Rust-compiled code only by aggregating function pointers in groups identified by their number of arguments.

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 defining and using compatible type identifiers (see Type metadata in the design document in the tracking issue #89653).

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

Thank you, `@eddyb` and `@pcc,` for all the help!
This commit is contained in:
bors 2021-10-27 09:19:42 +00:00
commit a8f6e614f8
35 changed files with 473 additions and 39 deletions
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8
compiler/rustc_symbol_mangling/src/lib.rs
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@ -104,8 +104,9 @@ use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
use rustc_middle::mir::mono::{InstantiationMode, MonoItem};
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::subst::SubstsRef;
use rustc_middle::ty::{self, Instance, TyCtxt};
use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
use rustc_session::config::SymbolManglingVersion;
use rustc_target::abi::call::FnAbi;
use tracing::debug;
@ -151,6 +152,11 @@ fn symbol_name_provider(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> ty::Symb
ty::SymbolName::new(tcx, &symbol_name)
}
/// This function computes the typeid for the given function ABI.
pub fn typeid_for_fnabi(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> String {
v0::mangle_typeid_for_fnabi(tcx, fn_abi)
}
/// Computes the symbol name for the given instance. This function will call
/// `compute_instantiating_crate` if it needs to factor the instantiating crate
/// into the symbol name.