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[Runtime][IRGen] Sign type context descriptor pointers.

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Ensure that context descriptor pointers are signed in the runtime by putting the ptrauth_struct attribute on the types.

We use the new __builtin_ptrauth_struct_key/disc to conditionally apply ptrauth_struct to TrailingObjects based on the signing of the base type, so that pointers to TrailingObjects get signed when used with a context descriptor pointer.

We add new runtime entrypoints that take signed pointers where appropriate, and have the compiler emit calls to the new entrypoints when targeting a sufficiently new OS.

rdar://111480914
This commit is contained in:
Mike Ash
2023-06-30 11:58:17 -04:00
parent 6f8fd07bdf
commit fe7e13bba5
29 changed files with 519 additions and 75 deletions
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4
stdlib/public/runtime/Casting.cpp
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@@ -519,7 +519,7 @@ bool swift::_conformsToProtocol(const OpaqueValue *value,
const WitnessTable **conformance) {
// Look up the witness table for protocols that need them.
if (protocol.needsWitnessTable()) {
auto witness = swift_conformsToProtocol(type, protocol.getSwiftProtocol());
auto witness = swift_conformsToProtocolCommon(type, protocol.getSwiftProtocol());
if (!witness)
return false;
if (conformance)
@@ -1349,7 +1349,7 @@ extern "C" const StructDescriptor NOMINAL_TYPE_DESCR_SYM(SS);
static const _ObjectiveCBridgeableWitnessTable *
swift_conformsToObjectiveCBridgeable(const Metadata *T) {
return reinterpret_cast<const _ObjectiveCBridgeableWitnessTable *>
(swift_conformsToProtocol(T, &PROTOCOL_DESCR_SYM(s21_ObjectiveCBridgeable)));
(swift_conformsToProtocolCommon(T, &PROTOCOL_DESCR_SYM(s21_ObjectiveCBridgeable)));
}
static const _ObjectiveCBridgeableWitnessTable *