bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

Add LLVM KCFI support to the Rust compiler

Browse source 
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>
This commit is contained in:
Ramon de C Valle 2022-11-21 21:29:00 -08:00
parent b7bc90fea3
commit 65698ae9f3
26 changed files with 231 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

8
compiler/rustc_codegen_llvm/src/llvm/ffi.rs
View file

@ -427,6 +427,7 @@ pub enum MetadataType {
MD_type = 19,
MD_vcall_visibility = 28,
MD_noundef = 29,
MD_kcfi_type = 36,
}
/// LLVMRustAsmDialect
@ -1060,6 +1061,7 @@ extern "C" {
pub fn LLVMGlobalSetMetadata<'a>(Val: &'a Value, KindID: c_uint, Metadata: &'a Metadata);
pub fn LLVMRustGlobalAddMetadata<'a>(Val: &'a Value, KindID: c_uint, Metadata: &'a Metadata);
pub fn LLVMValueAsMetadata(Node: &Value) -> &Metadata;
pub fn LLVMIsAFunction(Val: &Value) -> Option<&Value>;
// Operations on constants of any type
pub fn LLVMConstNull(Ty: &Type) -> &Value;
@ -1270,7 +1272,8 @@ extern "C" {
NumArgs: c_uint,
Then: &'a BasicBlock,
Catch: &'a BasicBlock,
Bundle: Option<&OperandBundleDef<'a>>,
OpBundles: *const Option<&OperandBundleDef<'a>>,
NumOpBundles: c_uint,
Name: *const c_char,
) -> &'a Value;
pub fn LLVMBuildLandingPad<'a>(
@ -1640,7 +1643,8 @@ extern "C" {
Fn: &'a Value,
Args: *const &'a Value,
NumArgs: c_uint,
Bundle: Option<&OperandBundleDef<'a>>,
OpBundles: *const Option<&OperandBundleDef<'a>>,
NumOpBundles: c_uint,
) -> &'a Value;
pub fn LLVMRustBuildMemCpy<'a>(
B: &Builder<'a>,