--- libmalloc/libmalloc-409.40.6/private/malloc_implementation.h
+++ libmalloc/libmalloc-474.0.13/private/malloc_implementation.h
@@ -32,6 +32,17 @@
 #include <mach/boolean.h>
 #include <stdbool.h>
 #include <stddef.h>
+#include <ptrauth.h>
+
+#if defined(__PTRAUTH_INTRINSICS__) && __PTRAUTH_INTRINSICS__ && \
+		__has_builtin(__builtin_ptrauth_string_discriminator)
+#define LIBMALLOC_FUNCTION_PTRAUTH(f) \
+   __ptrauth(ptrauth_key_function_pointer, 1, \
+           __builtin_ptrauth_string_discriminator("libmalloc_functions_" # f) \
+   ) f
+#else
+#define LIBMALLOC_FUNCTION_PTRAUTH(f) f
+#endif
 
 
 /*********	Libsystem initializers ************/
@@ -60,8 +71,8 @@
 struct _malloc_late_init {
 	unsigned long version;
 	/* The following functions are included in version 1 of this structure */
-	void * (*dlopen) (const char *path, int mode);
-	void * (*dlsym) (void *handle, const char *symbol);
+	void * (*LIBMALLOC_FUNCTION_PTRAUTH(dlopen)) (const char *path, int mode);
+	void * (*LIBMALLOC_FUNCTION_PTRAUTH(dlsym)) (void *handle, const char *symbol);
 	bool internal_diagnostics;  /* os_variant_has_internal_diagnostics() */
 	/* The following are included in version 2 of this structure */
 	const struct _malloc_msl_symbols *msl;
@@ -77,7 +88,7 @@
  * This is SPI that is *not* intended for use elsewhere. It will change
  * and will eventually be removed, without prior warning.
  */
-#if MALLOC_ENABLE_MSL_LITE_SPI
+#if defined(MALLOC_ENABLE_MSL_LITE_SPI) && MALLOC_ENABLE_MSL_LITE_SPI
 
 typedef struct szone_s szone_t;
 
@@ -108,7 +119,7 @@
 	malloc_zone_t *(*basic_zone)(szone_t *zone);
 } _malloc_msl_lite_hooks_t;
 
-#endif // MALLOC_ENABLE_MSL_LITE_SPI
+#endif // defined(MALLOC_ENABLE_MSL_LITE_SPI) && MALLOC_ENABLE_MSL_LITE_SPI
 
 #endif