Add LLVM KCFI support to the Rust compiler

This commit 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.

Co-authored-by: bjorn3 <17426603+bjorn3@users.noreply.github.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_ssa/src/traits/type_.rs b/compiler/rustc_codegen_ssa/src/traits/type_.rs
index 86481d5d758..109161ccc83 100644
--- a/compiler/rustc_codegen_ssa/src/traits/type_.rs
+++ b/compiler/rustc_codegen_ssa/src/traits/type_.rs
@@ -122,6 +122,7 @@ pub trait LayoutTypeMethods<'tcx>: Backend<'tcx> {
 pub trait TypeMembershipMethods<'tcx>: Backend<'tcx> {
     fn set_type_metadata(&self, function: Self::Function, typeid: String);
     fn typeid_metadata(&self, typeid: String) -> Self::Value;
+    fn set_kcfi_type_metadata(&self, function: Self::Function, typeid: u32);
 }
 
 pub trait ArgAbiMethods<'tcx>: HasCodegen<'tcx> {