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sys_patch: Save HID CS when patching USB 1.1

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Mykola Grymalyuk
2023-01-07 08:16:20 -07:00
parent b95ab91b43
commit 07d09d8eb2
1 changed files with 23 additions and 2 deletions
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25
resources/sys_patch/sys_patch.py
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@@ -111,7 +111,7 @@ class PatchSysVolume:
print(result.stdout.decode().strip())
return False
def merge_kdk_with_root(self):
def merge_kdk_with_root(self, save_hid_cs=False):
if self.skip_root_kmutil_requirement is True:
return
if self.constants.detected_os < os_data.os_data.ventura:
@@ -145,6 +145,14 @@ class PatchSysVolume:
raise Exception("Unable to find Kernel Debug Kit")
self.kdk_path = kdk_path
print(f"- Found KDK at: {kdk_path}")
# Due to some IOHIDFamily oddities, we need to ensure their CodeSignature is retained
cs_path = Path(self.mount_location) / Path("System/Library/Extensions/IOHIDFamily.kext/Contents/PlugIns/IOHIDEventDriver.kext/Contents/_CodeSignature")
if save_hid_cs is True and cs_path.exists():
print("- Backing up IOHIDEventDriver CodeSignature")
# Note it's a folder, not a file
utilities.elevated(["cp", "-r", cs_path, f"{self.constants.payload_path}/IOHIDEventDriver_CodeSignature.bak"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
print("- Merging KDK with Root Volume")
utilities.elevated(
# Only merge '/System/Library/Extensions'
@@ -159,6 +167,16 @@ class PatchSysVolume:
raise Exception("Failed to merge KDK with Root Volume")
print("- Successfully merged KDK with Root Volume")
# Restore IOHIDEventDriver CodeSignature
if save_hid_cs is True and Path(f"{self.constants.payload_path}/IOHIDEventDriver_CodeSignature.bak").exists():
print("- Restoring IOHIDEventDriver CodeSignature")
if not cs_path.exists():
print(" - CodeSignature folder missing, creating")
utilities.elevated(["mkdir", "-p", cs_path], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
utilities.elevated(["cp", "-r", f"{self.constants.payload_path}/IOHIDEventDriver_CodeSignature.bak", cs_path], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
utilities.elevated(["rm", "-rf", f"{self.constants.payload_path}/IOHIDEventDriver_CodeSignature.bak"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
def unpatch_root_vol(self):
if self.constants.detected_os > os_data.os_data.catalina and self.root_supports_snapshot is True:
print("- Reverting to last signed APFS snapshot")
@@ -541,7 +559,10 @@ class PatchSysVolume:
raise Exception(f"Failed to find {source_file}")
# Ensure KDK is properly installed
self.merge_kdk_with_root()
should_save_cs = False
if "Legacy USB 1.1" in required_patches:
should_save_cs = True
self.merge_kdk_with_root(save_hid_cs=should_save_cs)
print("- Finished Preflight, starting patching")