Reflection: Sign type descriptor and access function

Author: Azoy

stdlib/public/Reflection/Sources/_Runtime/Metadata/MetadataAccessFunction.swift

@@ -37,7 +37,8 @@ extension Metadata {
     @available(SwiftStdlib 5.9, *)
     @inlinable
     public func callAsFunction(_ request: Request) -> Metadata {
-      let fn = unsafeBitCast(ptr, to: AccessFn0.self)
+      let signedPtr = PtrAuth.signAccessFn0(ptr)
+      let fn = unsafeBitCast(signedPtr, to: AccessFn0.self)
 
       return fn(request).metadata
     }
@@ -76,7 +77,8 @@ extension Metadata {
       _ request: Request,
       _ arg0: UnsafeRawPointer
     ) -> Metadata {
-      let fn = unsafeBitCast(ptr, to: AccessFn1.self)
+      let signedPtr = PtrAuth.signAccessFn1(ptr)
+      let fn = unsafeBitCast(signedPtr, to: AccessFn1.self)
 
       return fn(request, arg0).metadata
     }
@@ -119,7 +121,8 @@ extension Metadata {
       _ arg0: UnsafeRawPointer,
       _ arg1: UnsafeRawPointer
     ) -> Metadata {
-      let fn = unsafeBitCast(ptr, to: AccessFn2.self)
+      let signedPtr = PtrAuth.signAccessFn2(ptr)
+      let fn = unsafeBitCast(signedPtr, to: AccessFn2.self)
 
       return fn(request, arg0, arg1).metadata
     }
@@ -166,7 +169,8 @@ extension Metadata {
       _ arg1: UnsafeRawPointer,
       _ arg2: UnsafeRawPointer
     ) -> Metadata {
-      let fn = unsafeBitCast(ptr, to: AccessFn3.self)
+      let signedPtr = PtrAuth.signAccessFn3(ptr)
+      let fn = unsafeBitCast(signedPtr, to: AccessFn3.self)
 
       return fn(request, arg0, arg1, arg2).metadata
     }
@@ -187,7 +191,8 @@ extension Metadata {
       _ request: Request,
       _ args: [any Any.Type]
     ) -> Metadata {
-      let fn = unsafeBitCast(ptr, to: AccessFnMany.self)
+      let signedPtr = PtrAuth.signAccessFnMany(ptr)
+      let fn = unsafeBitCast(signedPtr, to: AccessFnMany.self)
 
       return args.withUnsafeBufferPointer {
         fn(
@@ -205,7 +210,8 @@ extension Metadata {
       _ request: Request,
       _ args: [Metadata]
     ) -> Metadata {
-      let fn = unsafeBitCast(ptr, to: AccessFnMany.self)
+      let signedPtr = PtrAuth.signAccessFnMany(ptr)
+      let fn = unsafeBitCast(signedPtr, to: AccessFnMany.self)
 
       return args.withUnsafeBufferPointer {
         fn(
@@ -234,7 +240,8 @@ extension Metadata {
       _ request: Request,
       _ args: UnsafeBufferPointer<UnsafeRawPointer>
     ) -> Metadata {
-      let fn = unsafeBitCast(ptr, to: AccessFnMany.self)
+      let signedPtr = PtrAuth.signAccessFnMany(ptr)
+      let fn = unsafeBitCast(signedPtr, to: AccessFnMany.self)
 
       return fn(request, args.baseAddress.unsafelyUnwrapped).metadata
     }

stdlib/public/Reflection/Sources/_Runtime/Metadata/TypeMetadata.swift

@@ -42,7 +42,7 @@ extension TypeMetadata {
 
     address = address.unprotectedLoad(as: UnsafeRawPointer.self)
 
-    return TypeDescriptor(address)
+    return PtrAuth.signDescriptor(TypeDescriptor(address))
   }
 
   @inlinable

stdlib/public/Reflection/Sources/_Runtime/Utils/PtrAuth.swift

@@ -191,6 +191,76 @@ extension PtrAuth {
 
     return Metadata(signedBitPattern.rawPointer)
   }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn0(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    let signedBitPattern = UInt64(Builtin.int_ptrauth_sign(
+      superclass.ptr.bitPattern._value,
+      Key.processIndependentCode._value,
+      UInt64(Builtin.typePtrAuthDiscriminator(
+        Metadata.AccessFunction.AccessFn0.self
+      ))
+    ))
+    
+    return Metadata(signedBitPattern.rawPointer)
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn1(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    let signedBitPattern = UInt64(Builtin.int_ptrauth_sign(
+      superclass.ptr.bitPattern._value,
+      Key.processIndependentCode._value,
+      UInt64(Builtin.typePtrAuthDiscriminator(
+        Metadata.AccessFunction.AccessFn1.self
+      ))
+    ))
+    
+    return Metadata(signedBitPattern.rawPointer)
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn2(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    let signedBitPattern = UInt64(Builtin.int_ptrauth_sign(
+      superclass.ptr.bitPattern._value,
+      Key.processIndependentCode._value,
+      UInt64(Builtin.typePtrAuthDiscriminator(
+        Metadata.AccessFunction.AccessFn2.self
+      ))
+    ))
+    
+    return Metadata(signedBitPattern.rawPointer)
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn3(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    let signedBitPattern = UInt64(Builtin.int_ptrauth_sign(
+      superclass.ptr.bitPattern._value,
+      Key.processIndependentCode._value,
+      UInt64(Builtin.typePtrAuthDiscriminator(
+        Metadata.AccessFunction.AccessFn3.self
+      ))
+    ))
+    
+    return Metadata(signedBitPattern.rawPointer)
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFnMany(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    let signedBitPattern = UInt64(Builtin.int_ptrauth_sign(
+      superclass.ptr.bitPattern._value,
+      Key.processIndependentCode._value,
+      UInt64(Builtin.typePtrAuthDiscriminator(
+        Metadata.AccessFunction.AccessFnMany.self
+      ))
+    ))
+    
+    return Metadata(signedBitPattern.rawPointer)
+  }
 #else
   @available(SwiftStdlib 5.9, *)
   @inlinable
@@ -217,6 +287,36 @@ extension PtrAuth {
   static func signSuperclass(_ superclass: Metadata) -> Metadata {
     superclass
   }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn0(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    fnPtr
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn1(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    fnPtr
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn2(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    fnPtr
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFn3(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    fnPtr
+  }
+
+  @available(SwiftStdlib 5.9, *)
+  @inlinable
+  static func signAccessFnMany(_ fnPtr: UnsafeRawPointer) -> UnsafeRawPointer {
+    fnPtr
+  }
 #endif
 }