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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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GPG Key ID: 4AEE18F83AFDEB23
27 changed files with 261 additions and 28 deletions
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12
Cargo.lock
View File

@ -4403,6 +4403,7 @@ dependencies = [
"rustc_span",
"rustc_target",
"tracing",
"twox-hash",
]
[[package]]
@ -5393,6 +5394,17 @@ dependencies = [
"tracing-subscriber",
]
[[package]]
name = "twox-hash"
version = "1.6.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "97fee6b57c6a41524a810daee9286c02d7752c4253064d0b05472833a438f675"
dependencies = [
"cfg-if 1.0.0",
"rand 0.8.5",
"static_assertions",
]
[[package]]
name = "type-map"
version = "0.4.0"

4
compiler/rustc_codegen_gcc/src/type_.rs
View File

@ -300,4 +300,8 @@ impl<'gcc, 'tcx> TypeMembershipMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
// Unsupported.
self.context.new_rvalue_from_int(self.int_type, 0)
}
fn set_kcfi_type_metadata(&self, _function: RValue<'gcc>, _kcfi_typeid: u32) {
// Unsupported.
}
}

14
compiler/rustc_codegen_llvm/src/allocator.rs
View File

@ -88,7 +88,8 @@ pub(crate) unsafe fn codegen(
callee,
args.as_ptr(),
args.len() as c_uint,
None,
[].as_ptr(),
0 as c_uint,
);
llvm::LLVMSetTailCall(ret, True);
if output.is_some() {
@ -132,8 +133,15 @@ pub(crate) unsafe fn codegen(
.enumerate()
.map(|(i, _)| llvm::LLVMGetParam(llfn, i as c_uint))
.collect::<Vec<_>>();
let ret =
llvm::LLVMRustBuildCall(llbuilder, ty, callee, args.as_ptr(), args.len() as c_uint, None);
let ret = llvm::LLVMRustBuildCall(
llbuilder,
ty,
callee,
args.as_ptr(),
args.len() as c_uint,
[].as_ptr(),
0 as c_uint,
);
llvm::LLVMSetTailCall(ret, True);
llvm::LLVMBuildRetVoid(llbuilder);
llvm::LLVMDisposeBuilder(llbuilder);

50
compiler/rustc_codegen_llvm/src/builder.rs
View File

@ -20,6 +20,7 @@ use rustc_middle::ty::layout::{
};
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::Span;
use rustc_symbol_mangling::typeid::kcfi_typeid_for_fnabi;
use rustc_target::abi::{self, call::FnAbi, Align, Size, WrappingRange};
use rustc_target::spec::{HasTargetSpec, Target};
use std::borrow::Cow;
@ -225,9 +226,25 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
debug!("invoke {:?} with args ({:?})", llfn, args);
let args = self.check_call("invoke", llty, llfn, args);
let bundle = funclet.map(|funclet| funclet.bundle());
let bundle = bundle.as_ref().map(|b| &*b.raw);
let funclet_bundle = funclet.map(|funclet| funclet.bundle());
let funclet_bundle = funclet_bundle.as_ref().map(|b| &*b.raw);
let mut bundles = vec![funclet_bundle];
// Set KCFI operand bundle
let is_indirect_call = unsafe { llvm::LLVMIsAFunction(llfn).is_none() };
let kcfi_bundle =
if self.tcx.sess.is_sanitizer_kcfi_enabled() && fn_abi.is_some() && is_indirect_call {
let kcfi_typeid = kcfi_typeid_for_fnabi(self.tcx, fn_abi.unwrap());
Some(llvm::OperandBundleDef::new("kcfi", &[self.const_u32(kcfi_typeid)]))
} else {
None
};
if kcfi_bundle.is_some() {
let kcfi_bundle = kcfi_bundle.as_ref().map(|b| &*b.raw);
bundles.push(kcfi_bundle);
}
bundles.retain(|bundle| bundle.is_some());
let invoke = unsafe {
llvm::LLVMRustBuildInvoke(
self.llbuilder,
@ -237,7 +254,8 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
args.len() as c_uint,
then,
catch,
bundle,
bundles.as_ptr(),
bundles.len() as c_uint,
UNNAMED,
)
};
@ -1143,7 +1161,8 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
llfn,
args.as_ptr() as *const &llvm::Value,
args.len() as c_uint,
None,
[].as_ptr(),
0 as c_uint,
);
}
}
@ -1159,9 +1178,25 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
debug!("call {:?} with args ({:?})", llfn, args);
let args = self.check_call("call", llty, llfn, args);
let bundle = funclet.map(|funclet| funclet.bundle());
let bundle = bundle.as_ref().map(|b| &*b.raw);
let funclet_bundle = funclet.map(|funclet| funclet.bundle());
let funclet_bundle = funclet_bundle.as_ref().map(|b| &*b.raw);
let mut bundles = vec![funclet_bundle];
// Set KCFI operand bundle
let is_indirect_call = unsafe { llvm::LLVMIsAFunction(llfn).is_none() };
let kcfi_bundle =
if self.tcx.sess.is_sanitizer_kcfi_enabled() && fn_abi.is_some() && is_indirect_call {
let kcfi_typeid = kcfi_typeid_for_fnabi(self.tcx, fn_abi.unwrap());
Some(llvm::OperandBundleDef::new("kcfi", &[self.const_u32(kcfi_typeid)]))
} else {
None
};
if kcfi_bundle.is_some() {
let kcfi_bundle = kcfi_bundle.as_ref().map(|b| &*b.raw);
bundles.push(kcfi_bundle);
}
bundles.retain(|bundle| bundle.is_some());
let call = unsafe {
llvm::LLVMRustBuildCall(
self.llbuilder,
@ -1169,7 +1204,8 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
llfn,
args.as_ptr() as *const &llvm::Value,
args.len() as c_uint,
bundle,
bundles.as_ptr(),
bundles.len() as c_uint,
)
};
if let Some(fn_abi) = fn_abi {

5
compiler/rustc_codegen_llvm/src/context.rs
View File

@ -250,6 +250,11 @@ pub unsafe fn create_module<'ll>(
);
}
if sess.is_sanitizer_kcfi_enabled() {
let kcfi = "kcfi\0".as_ptr().cast();
llvm::LLVMRustAddModuleFlag(llmod, llvm::LLVMModFlagBehavior::Override, kcfi, 1);
}
// Control Flow Guard is currently only supported by the MSVC linker on Windows.
if sess.target.is_like_msvc {
match sess.opts.cg.control_flow_guard {

7
compiler/rustc_codegen_llvm/src/declare.rs
View File

@ -20,7 +20,7 @@ use crate::type_::Type;
use crate::value::Value;
use rustc_codegen_ssa::traits::TypeMembershipMethods;
use rustc_middle::ty::Ty;
use rustc_symbol_mangling::typeid::typeid_for_fnabi;
use rustc_symbol_mangling::typeid::{kcfi_typeid_for_fnabi, typeid_for_fnabi};
use smallvec::SmallVec;
/// Declare a function.
@ -136,6 +136,11 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
self.set_type_metadata(llfn, typeid);
}
if self.tcx.sess.is_sanitizer_kcfi_enabled() {
let kcfi_typeid = kcfi_typeid_for_fnabi(self.tcx, fn_abi);
self.set_kcfi_type_metadata(llfn, kcfi_typeid);
}
llfn
}

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
@ -1063,6 +1064,7 @@ 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;
@ -1273,7 +1275,8 @@ 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>(
@ -1643,7 +1646,8 @@ 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>,

15
compiler/rustc_codegen_llvm/src/type_.rs
View File

@ -316,4 +316,19 @@ impl<'ll, 'tcx> TypeMembershipMethods<'tcx> for CodegenCx<'ll, 'tcx> {
)
}
}
fn set_kcfi_type_metadata(&self, function: &'ll Value, kcfi_typeid: u32) {
let kcfi_type_metadata = self.const_u32(kcfi_typeid);
unsafe {
llvm::LLVMGlobalSetMetadata(
function,
llvm::MD_kcfi_type as c_uint,
llvm::LLVMMDNodeInContext2(
self.llcx,
&llvm::LLVMValueAsMetadata(kcfi_type_metadata),
1,
),
)
}
}
}

1
compiler/rustc_codegen_ssa/src/traits/type_.rs
View File

@ -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> {

2
compiler/rustc_feature/src/builtin_attrs.rs
View File

@ -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)),

4
compiler/rustc_hir_analysis/src/collect.rs
View File

@ -1846,6 +1846,8 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: DefId) -> CodegenFnAttrs {
codegen_fn_attrs.no_sanitize |= SanitizerSet::ADDRESS;
} else if item.has_name(sym::cfi) {
codegen_fn_attrs.no_sanitize |= SanitizerSet::CFI;
} else if item.has_name(sym::kcfi) {
codegen_fn_attrs.no_sanitize |= SanitizerSet::KCFI;
} else if item.has_name(sym::memory) {
codegen_fn_attrs.no_sanitize |= SanitizerSet::MEMORY;
} else if item.has_name(sym::memtag) {
@ -1859,7 +1861,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: DefId) -> CodegenFnAttrs {
} else {
tcx.sess
.struct_span_err(item.span(), "invalid argument for `no_sanitize`")
.note("expected one of: `address`, `cfi`, `hwaddress`, `memory`, `memtag`, `shadow-call-stack`, or `thread`")
.note("expected one of: `address`, `cfi`, `hwaddress`, `kcfi`, `memory`, `memtag`, `shadow-call-stack`, or `thread`")
.emit();
}
}

16
compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
View File

@ -1476,13 +1476,13 @@ extern "C" void LLVMRustFreeOperandBundleDef(OperandBundleDef *Bundle) {
extern "C" LLVMValueRef LLVMRustBuildCall(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
LLVMValueRef *Args, unsigned NumArgs,
OperandBundleDef *Bundle) {
OperandBundleDef **OpBundles,
unsigned NumOpBundles) {
Value *Callee = unwrap(Fn);
FunctionType *FTy = unwrap<FunctionType>(Ty);
unsigned Len = Bundle ? 1 : 0;
ArrayRef<OperandBundleDef> Bundles = makeArrayRef(Bundle, Len);
return wrap(unwrap(B)->CreateCall(
FTy, Callee, makeArrayRef(unwrap(Args), NumArgs), Bundles));
FTy, Callee, makeArrayRef(unwrap(Args), NumArgs),
makeArrayRef(*OpBundles, NumOpBundles)));
}
extern "C" LLVMValueRef LLVMRustGetInstrProfIncrementIntrinsic(LLVMModuleRef M) {
@ -1522,14 +1522,14 @@ extern "C" LLVMValueRef
LLVMRustBuildInvoke(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
LLVMValueRef *Args, unsigned NumArgs,
LLVMBasicBlockRef Then, LLVMBasicBlockRef Catch,
OperandBundleDef *Bundle, const char *Name) {
OperandBundleDef **OpBundles, unsigned NumOpBundles,
const char *Name) {
Value *Callee = unwrap(Fn);
FunctionType *FTy = unwrap<FunctionType>(Ty);
unsigned Len = Bundle ? 1 : 0;
ArrayRef<OperandBundleDef> Bundles = makeArrayRef(Bundle, Len);
return wrap(unwrap(B)->CreateInvoke(FTy, Callee, unwrap(Then), unwrap(Catch),
makeArrayRef(unwrap(Args), NumArgs),
Bundles, Name));
makeArrayRef(*OpBundles, NumOpBundles),
Name));
}
extern "C" void LLVMRustPositionBuilderAtStart(LLVMBuilderRef B,

3
compiler/rustc_session/src/options.rs
View File

@ -368,7 +368,7 @@ mod desc {
pub const parse_opt_panic_strategy: &str = parse_panic_strategy;
pub const parse_oom_strategy: &str = "either `panic` or `abort`";
pub const parse_relro_level: &str = "one of: `full`, `partial`, or `off`";
pub const parse_sanitizers: &str = "comma separated list of sanitizers: `address`, `cfi`, `hwaddress`, `leak`, `memory`, `memtag`, `shadow-call-stack`, or `thread`";
pub const parse_sanitizers: &str = "comma separated list of sanitizers: `address`, `cfi`, `hwaddress`, `kcfi`, `leak`, `memory`, `memtag`, `shadow-call-stack`, or `thread`";
pub const parse_sanitizer_memory_track_origins: &str = "0, 1, or 2";
pub const parse_cfguard: &str =
"either a boolean (`yes`, `no`, `on`, `off`, etc), `checks`, or `nochecks`";
@ -675,6 +675,7 @@ mod parse {
*slot |= match s {
"address" => SanitizerSet::ADDRESS,
"cfi" => SanitizerSet::CFI,
"kcfi" => SanitizerSet::KCFI,
"leak" => SanitizerSet::LEAK,
"memory" => SanitizerSet::MEMORY,
"memtag" => SanitizerSet::MEMTAG,

12
compiler/rustc_session/src/session.rs
View File

@ -686,6 +686,10 @@ impl Session {
self.opts.unstable_opts.sanitizer.contains(SanitizerSet::CFI)
}
pub fn is_sanitizer_kcfi_enabled(&self) -> bool {
self.opts.unstable_opts.sanitizer.contains(SanitizerSet::KCFI)
}
/// Check whether this compile session and crate type use static crt.
pub fn crt_static(&self, crate_type: Option<CrateType>) -> bool {
if !self.target.crt_static_respected {
@ -1544,6 +1548,14 @@ fn validate_commandline_args_with_session_available(sess: &Session) {
}
}
// LLVM CFI and KCFI are mutually exclusive
if sess.is_sanitizer_cfi_enabled() && sess.is_sanitizer_kcfi_enabled() {
sess.emit_err(CannotMixAndMatchSanitizers {
first: "cfi".to_string(),
second: "kcfi".to_string(),
});
}
if sess.opts.unstable_opts.stack_protector != StackProtector::None {
if !sess.target.options.supports_stack_protector {
sess.emit_warning(StackProtectorNotSupportedForTarget {

1
compiler/rustc_span/src/symbol.rs
View File

@ -828,6 +828,7 @@ symbols! {
item_like_imports,
iter,
iter_repeat,
kcfi,
keyword,
kind,
kreg,

1
compiler/rustc_symbol_mangling/Cargo.toml
View File

@ -10,6 +10,7 @@ bitflags = "1.2.1"
tracing = "0.1"
punycode = "0.4.0"
rustc-demangle = "0.1.21"
twox-hash = "1.6.3"
rustc_span = { path = "../rustc_span" }
rustc_middle = { path = "../rustc_middle" }

24
compiler/rustc_symbol_mangling/src/typeid.rs
View File

@ -3,6 +3,8 @@
use rustc_middle::ty::{FnSig, Ty, TyCtxt};
use rustc_target::abi::call::FnAbi;
use std::hash::Hasher;
use twox_hash::XxHash64;
mod typeid_itanium_cxx_abi;
use typeid_itanium_cxx_abi::TypeIdOptions;
@ -16,3 +18,25 @@ pub fn typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>)
pub fn typeid_for_fnsig<'tcx>(tcx: TyCtxt<'tcx>, fn_sig: &FnSig<'tcx>) -> String {
typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, TypeIdOptions::NO_OPTIONS)
}
/// Returns an LLVM KCFI type metadata identifier for the specified FnAbi.
pub fn kcfi_typeid_for_fnabi<'tcx>(tcx: TyCtxt<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> u32 {
// An LLVM KCFI type metadata identifier is a 32-bit constant produced by taking the lower half
// of the xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
let mut hash: XxHash64 = Default::default();
hash.write(
typeid_itanium_cxx_abi::typeid_for_fnabi(tcx, fn_abi, TypeIdOptions::NO_OPTIONS).as_bytes(),
);
hash.finish() as u32
}
/// Returns an LLVM KCFI type metadata identifier for the specified FnSig.
pub fn kcfi_typeid_for_fnsig<'tcx>(tcx: TyCtxt<'tcx>, fn_sig: &FnSig<'tcx>) -> u32 {
// An LLVM KCFI type metadata identifier is a 32-bit constant produced by taking the lower half
// of the xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
let mut hash: XxHash64 = Default::default();
hash.write(
typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, TypeIdOptions::NO_OPTIONS).as_bytes(),
);
hash.finish() as u32
}

5
compiler/rustc_target/src/spec/aarch64_unknown_none.rs
View File

@ -6,13 +6,16 @@
//
// For example, `-C target-cpu=cortex-a53`.
use super::{Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
use super::{
Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, SanitizerSet, Target, TargetOptions,
};
pub fn target() -> Target {
let opts = TargetOptions {
linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
linker: Some("rust-lld".into()),
features: "+strict-align,+neon,+fp-armv8".into(),
supported_sanitizers: SanitizerSet::KCFI,
relocation_model: RelocModel::Static,
disable_redzone: true,
max_atomic_width: Some(128),

6
compiler/rustc_target/src/spec/mod.rs
View File

@ -804,7 +804,7 @@ impl ToJson for StackProbeType {
bitflags::bitflags! {
#[derive(Default, Encodable, Decodable)]
pub struct SanitizerSet: u8 {
pub struct SanitizerSet: u16 {
const ADDRESS = 1 << 0;
const LEAK = 1 << 1;
const MEMORY = 1 << 2;
@ -813,6 +813,7 @@ bitflags::bitflags! {
const CFI = 1 << 5;
const MEMTAG = 1 << 6;
const SHADOWCALLSTACK = 1 << 7;
const KCFI = 1 << 8;
}
}
@ -824,6 +825,7 @@ impl SanitizerSet {
Some(match self {
SanitizerSet::ADDRESS => "address",
SanitizerSet::CFI => "cfi",
SanitizerSet::KCFI => "kcfi",
SanitizerSet::LEAK => "leak",
SanitizerSet::MEMORY => "memory",
SanitizerSet::MEMTAG => "memtag",
@ -859,6 +861,7 @@ impl IntoIterator for SanitizerSet {
[
SanitizerSet::ADDRESS,
SanitizerSet::CFI,
SanitizerSet::KCFI,
SanitizerSet::LEAK,
SanitizerSet::MEMORY,
SanitizerSet::MEMTAG,
@ -2327,6 +2330,7 @@ impl Target {
base.$key_name |= match s.as_str() {
Some("address") => SanitizerSet::ADDRESS,
Some("cfi") => SanitizerSet::CFI,
Some("kcfi") => SanitizerSet::KCFI,
Some("leak") => SanitizerSet::LEAK,
Some("memory") => SanitizerSet::MEMORY,
Some("memtag") => SanitizerSet::MEMTAG,

3
compiler/rustc_target/src/spec/x86_64_unknown_none.rs
View File

@ -5,7 +5,7 @@
// features.
use super::{Cc, CodeModel, LinkerFlavor, Lld, PanicStrategy};
use super::{RelroLevel, StackProbeType, Target, TargetOptions};
use super::{RelroLevel, SanitizerSet, StackProbeType, Target, TargetOptions};
pub fn target() -> Target {
let opts = TargetOptions {
@ -20,6 +20,7 @@ pub fn target() -> Target {
features:
"-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2,+soft-float"
.into(),
supported_sanitizers: SanitizerSet::KCFI,
disable_redzone: true,
panic_strategy: PanicStrategy::Abort,
code_model: Some(CodeModel::Kernel),

30
src/doc/unstable-book/src/compiler-flags/sanitizer.md
View File

@ -14,6 +14,9 @@ This feature allows for use of one of following sanitizers:
forward-edge control flow protection.
* [HWAddressSanitizer](#hwaddresssanitizer) a memory error detector similar to
AddressSanitizer, but based on partial hardware assistance.
* [KernelControlFlowIntegrity](#kernelcontrolflowintegrity) LLVM Kernel Control
Flow Integrity (KCFI) provides forward-edge control flow protection for
operating systems kernels.
* [LeakSanitizer](#leaksanitizer) a run-time memory leak detector.
* [MemorySanitizer](#memorysanitizer) a detector of uninitialized reads.
* [MemTagSanitizer](#memtagsanitizer) fast memory error detector based on
@ -502,6 +505,32 @@ Registers where the failure occurred (pc 0xaaaae0ae4a98):
SUMMARY: HWAddressSanitizer: tag-mismatch (/.../main+0x54a94)
```
# KernelControlFlowIntegrity
The LLVM Kernel Control Flow Integrity (CFI) support to the Rust compiler
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 commit cff5bef "KCFI
sanitizer"](https://github.com/llvm/llvm-project/commit/cff5bef948c91e4919de8a5fb9765e0edc13f3de).)
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 by defining and using
compatible type identifiers (see Type metadata in the design document in the
tracking issue [#89653](https://github.com/rust-lang/rust/issues/89653)).
LLVM KCFI can be enabled with `-Zsanitizer=kcfi`.
LLVM KCFI is supported on the following targets:
* `aarch64-linux-android`
* `aarch64-unknown-linux-gnu`
* `x86_64-linux-android`
* `x86_64-unknown-linux-gnu`
See the [Clang KernelControlFlowIntegrity documentation][clang-kcfi] for more
details.
# LeakSanitizer
LeakSanitizer is run-time memory leak detector.
@ -693,6 +722,7 @@ Sanitizers produce symbolized stacktraces when llvm-symbolizer binary is in `PAT
[clang-asan]: https://clang.llvm.org/docs/AddressSanitizer.html
[clang-cfi]: https://clang.llvm.org/docs/ControlFlowIntegrity.html
[clang-hwasan]: https://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
[clang-kcfi]: https://clang.llvm.org/docs/ControlFlowIntegrity.html#fsanitize-kcfi
[clang-lsan]: https://clang.llvm.org/docs/LeakSanitizer.html
[clang-msan]: https://clang.llvm.org/docs/MemorySanitizer.html
[clang-scs]: https://clang.llvm.org/docs/ShadowCallStack.html

11
src/test/codegen/sanitizer-kcfi-add-kcfi-flag.rs Normal file
View File

@ -0,0 +1,11 @@
// Verifies that "kcfi" module flag is added.
//
// needs-sanitizer-kcfi
// compile-flags: -Ctarget-feature=-crt-static -Zsanitizer=kcfi
#![crate_type="lib"]
pub fn foo() {
}
// CHECK: !{{[0-9]+}} = !{i32 4, !"kcfi", i32 1}

47
src/test/codegen/sanitizer-kcfi-emit-kcfi-operand-bundle-itanium-cxx-abi.rs Normal file
View File

@ -0,0 +1,47 @@
// Verifies that KCFI type metadata for functions are emitted.
//
// revisions: aarch64 x86_64
// [aarch64] compile-flags: --target aarch64-unknown-none
// [aarch64] needs-llvm-components: aarch64
// [x86_64] compile-flags: --target x86_64-unknown-none
// [x86_64] needs-llvm-components:
// compile-flags: -Cno-prepopulate-passes -Zsanitizer=kcfi
#![crate_type="lib"]
#![feature(no_core, lang_items)]
#![no_core]
#[lang="sized"]
trait Sized { }
#[lang="copy"]
trait Copy { }
impl Copy for i32 {}
pub fn foo(f: fn(i32) -> i32, arg: i32) -> i32 {
// CHECK-LABEL: define{{.*}}foo
// FIXME(rcvalle): Change <unknown kind #36> to !kcfi_type when Rust is updated to LLVM 16
// CHECK-SAME: {{.*}}!<unknown kind #36> ![[TYPE1:[0-9]+]]
// CHECK: call i32 %f(i32 %arg){{.*}}[ "kcfi"(i32 -1666898348) ]
f(arg)
}
pub fn bar(f: fn(i32, i32) -> i32, arg1: i32, arg2: i32) -> i32 {
// CHECK-LABEL: define{{.*}}bar
// FIXME(rcvalle): Change <unknown kind #36> to !kcfi_type when Rust is updated to LLVM 16
// CHECK-SAME: {{.*}}!<unknown kind #36> ![[TYPE2:[0-9]+]]
// CHECK: call i32 %f(i32 %arg1, i32 %arg2){{.*}}[ "kcfi"(i32 -1789026986) ]
f(arg1, arg2)
}
pub fn baz(f: fn(i32, i32, i32) -> i32, arg1: i32, arg2: i32, arg3: i32) -> i32 {
// CHECK-LABEL: define{{.*}}baz
// FIXME(rcvalle): Change <unknown kind #36> to !kcfi_type when Rust is updated to LLVM 16
// CHECK-SAME: {{.*}}!<unknown kind #36> ![[TYPE3:[0-9]+]]
// CHECK: call i32 %f(i32 %arg1, i32 %arg2, i32 %arg3){{.*}}[ "kcfi"(i32 1248878270) ]
f(arg1, arg2, arg3)
}
// CHECK: ![[TYPE1]] = !{i32 653723426}
// CHECK: ![[TYPE2]] = !{i32 412174924}
// CHECK: ![[TYPE3]] = !{i32 -636668840}

2
src/test/ui/invalid/invalid-no-sanitize.stderr
View File

@ -4,7 +4,7 @@ error: invalid argument for `no_sanitize`
LL | #[no_sanitize(brontosaurus)]
| ^^^^^^^^^^^^
|
= note: expected one of: `address`, `cfi`, `hwaddress`, `memory`, `memtag`, `shadow-call-stack`, or `thread`
= note: expected one of: `address`, `cfi`, `hwaddress`, `kcfi`, `memory`, `memtag`, `shadow-call-stack`, or `thread`
error: aborting due to previous error

2
src/tools/compiletest/src/header.rs
View File

@ -906,6 +906,7 @@ pub fn make_test_description<R: Read>(
let has_asm_support = config.has_asm_support();
let has_asan = util::ASAN_SUPPORTED_TARGETS.contains(&&*config.target);
let has_cfi = util::CFI_SUPPORTED_TARGETS.contains(&&*config.target);
let has_kcfi = util::KCFI_SUPPORTED_TARGETS.contains(&&*config.target);
let has_lsan = util::LSAN_SUPPORTED_TARGETS.contains(&&*config.target);
let has_msan = util::MSAN_SUPPORTED_TARGETS.contains(&&*config.target);
let has_tsan = util::TSAN_SUPPORTED_TARGETS.contains(&&*config.target);
@ -957,6 +958,7 @@ pub fn make_test_description<R: Read>(
&& config.parse_name_directive(ln, "needs-sanitizer-support");
ignore |= !has_asan && config.parse_name_directive(ln, "needs-sanitizer-address");
ignore |= !has_cfi && config.parse_name_directive(ln, "needs-sanitizer-cfi");
ignore |= !has_kcfi && config.parse_name_directive(ln, "needs-sanitizer-kcfi");
ignore |= !has_lsan && config.parse_name_directive(ln, "needs-sanitizer-leak");
ignore |= !has_msan && config.parse_name_directive(ln, "needs-sanitizer-memory");
ignore |= !has_tsan && config.parse_name_directive(ln, "needs-sanitizer-thread");

2
src/tools/compiletest/src/util.rs
View File

@ -42,6 +42,8 @@ pub const CFI_SUPPORTED_TARGETS: &[&str] = &[
"x86_64-unknown-netbsd",
];
pub const KCFI_SUPPORTED_TARGETS: &[&str] = &["aarch64-linux-none", "x86_64-linux-none"];
pub const LSAN_SUPPORTED_TARGETS: &[&str] = &[
// FIXME: currently broken, see #88132
// "aarch64-apple-darwin",

2
src/tools/tidy/src/deps.rs
View File

@ -219,6 +219,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
"snap",
"stable_deref_trait",
"stacker",
"static_assertions",
"syn",
"synstructure",
"tempfile",
@ -239,6 +240,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
"tracing-log",
"tracing-subscriber",
"tracing-tree",
"twox-hash",
"type-map",
"typenum",
"unic-char-property",