From fcd20c21b87ab95853cb39a1ff47bef663a394b9 Mon Sep 17 00:00:00 2001
From: Jevin Sweval <jevinsweval@gmail.com>
Date: Tue, 16 Nov 2021 21:29:09 -0800
Subject: [PATCH] Initial support for arm64e PAC

---
 fishhook.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/fishhook.c b/fishhook.c
index fb41e8e..e6d92d1 100644
--- a/fishhook.c
+++ b/fishhook.c
@@ -36,6 +36,10 @@
 #include <mach-o/loader.h>
 #include <mach-o/nlist.h>
 
+#if __has_include(<ptrauth.h>)
+#include <ptrauth.h>
+#endif
+
 #ifdef __LP64__
 typedef struct mach_header_64 mach_header_t;
 typedef struct segment_command_64 segment_command_t;
@@ -153,7 +157,16 @@ static void perform_rebinding_with_section(struct rebindings_entry *rebindings,
              * iOS 15 has corrected the const segments prot.
              * -- Lionfore Hao Jun 11th, 2021
              **/
+            #if !__has_feature(ptrauth_calls)
             indirect_symbol_bindings[i] = cur->rebindings[j].replacement;
+            #else
+            void *replacement = cur->rebindings[j].replacement;
+            if (!strcmp(section->sectname, "__auth_got")) {
+              void *stripped = ptrauth_strip(replacement, ptrauth_key_process_independent_code);
+              replacement = ptrauth_sign_unauthenticated(stripped, ptrauth_key_process_independent_code, &indirect_symbol_bindings[i]);
+            }
+            indirect_symbol_bindings[i] = replacement;
+            #endif
           }
           goto symbol_loop;
         }