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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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6
lib/IRGen/GenPointerAuth.cpp
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@@ -355,6 +355,12 @@ PointerAuthEntity::getDeclDiscriminator(IRGenModule &IGM) const {
case Special::ProtocolConformanceDescriptor:
case Special::ProtocolConformanceDescriptorAsArgument:
return SpecialPointerAuthDiscriminators::ProtocolConformanceDescriptor;
case Special::ProtocolDescriptorAsArgument:
return SpecialPointerAuthDiscriminators::ProtocolDescriptor;
case Special::OpaqueTypeDescriptorAsArgument:
return SpecialPointerAuthDiscriminators::OpaqueTypeDescriptor;
case Special::ContextDescriptorAsArgument:
return SpecialPointerAuthDiscriminators::ContextDescriptor;
case Special::PartialApplyCapture:
return PointerAuthDiscriminator_PartialApplyCapture;
case Special::KeyPathDestroy: