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Derive IOPlatformUUID and serial per host instead of hardcoding them

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Every install reported the same IOPlatformUUID and an Apple-format serial
(C02ZL0GVMD6N) that may belong to a real MacBook Pro. Derive both from a
SHA-256 of the host machine-id and a fixed app string: stable per host,
distinct between hosts, and the raw machine-id is not exposed. The serial
is DARLING-<8 hex>, a form no Mac uses. iokitd is built without ARC, so
the derived strings are owned for the daemon's lifetime. Fix the header
comment that said the values came from DMI.

Refs #24

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
ztancrellandClaude Opus 5.5 committed 2026-10-17 11:05:28 -04:00
1 parent 436c278e4b
commit dd7e151fbb
1 file changed
+49 -8
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patches/iokitd.patch
+49 -8
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@@ -663,6 +663,7 @@ index 91d11a1..37551e1 100644
-}
diff --git a/src/IOPlatformExpertDevice.h b/src/IOPlatformExpertDevice.h
new file mode 100644
index 0000000..38ad635
--- /dev/null
+++ b/src/IOPlatformExpertDevice.h
@@ -0,0 +1,21 @@
@@ -673,8 +674,8 @@ new file mode 100644
+#include "ServiceRegistry.h"
+
+// The root platform device (what IOServiceMatching("IOPlatformExpertDevice") finds on macOS).
+// Its properties describe the host machine as reported by the Linux kernel's DMI tables.
+// Identifiers the host does not expose to us (serial number, UUID) are left out.
+// Its model strings name a fixed MacBookPro16,1. IOPlatformUUID and IOPlatformSerialNumber are
+// derived from the host machine-id, so they differ per host and stay stable across reinstalls.
+class IOPlatformExpertDevice : public IOService
+{
+public:
@@ -689,14 +690,19 @@ new file mode 100644
+#endif
diff --git a/src/IOPlatformExpertDevice.mm b/src/IOPlatformExpertDevice.mm
new file mode 100644
index 0000000..e330569
--- /dev/null
+++ b/src/IOPlatformExpertDevice.mm
@@ -0,0 +1,54 @@
@@ -0,0 +1,93 @@
+#include "IOPlatformExpertDevice.h"
+#import <Foundation/NSString.h>
+#import <Foundation/NSData.h>
+#import <Foundation/NSArray.h>
+#import <Foundation/NSCharacterSet.h>
+#import <Foundation/NSDictionary.h>
+#include <CommonCrypto/CommonDigest.h>
+#include <uuid/uuid.h>
+#include <unistd.h>
+#include <cstring>
+
+// Platform expert strings are NUL-terminated data
@@ -719,17 +725,52 @@ new file mode 100644
+ };
+}
+
+// Per-host identifiers, stable like a real Mac's: a SHA-256 of the host machine-id and a fixed
+// string, so the raw machine-id (which machine-id(5) says not to expose) never reaches apps.
+// The serial's "DARLING-" form is longer than any Apple serial and cannot match a real Mac.
+static bool hostIdentifiers(NSString** uuid, NSString** serial)
+{
+ static const char app[] = "darling-lol IOPlatformExpertDevice";
+ uuid_t machineID;
+ struct timespec wait = { 0, 0 };
+ if (gethostuuid(machineID, &wait) != 0)
+ return false;
+
+ unsigned char input[sizeof(machineID) + sizeof(app)];
+ std::memcpy(input, machineID, sizeof(machineID));
+ std::memcpy(input + sizeof(machineID), app, sizeof(app));
+ unsigned char hash[CC_SHA256_DIGEST_LENGTH];
+ CC_SHA256(input, sizeof(input), hash);
+
+ hash[6] = (hash[6] & 0x0f) | 0x40; // version 4
+ hash[8] = (hash[8] & 0x3f) | 0x80; // RFC 4122 variant
+ uuid_string_t text;
+ uuid_unparse_upper(hash, text);
+ // Owned (not autoreleased): the caller keeps them in statics for the daemon's lifetime
+ *uuid = [[NSString alloc] initWithUTF8String: text];
+ *serial = [[NSString alloc] initWithFormat: @"DARLING-%02X%02X%02X%02X", hash[16], hash[17], hash[18], hash[19]];
+ return true;
+}
+
+NSDictionary* IOPlatformExpertDevice::getProperties()
+{
+ // Fixed MacBookPro16,1 identity; the Linux DMI values describe the host hardware, not the Mac we emulate
+ return @{
+ // MacBookPro16,1 model strings; the Linux DMI values describe the host hardware, not the Mac we emulate
+ NSMutableDictionary* properties = [NSMutableDictionary dictionaryWithDictionary: @{
+ @"manufacturer": dataForString(@"Apple Inc."),
+ @"model": dataForString(@"MacBookPro16,1"),
+ @"product-name": dataForString(@"MacBookPro16,1"),
+ @"board-id": dataForString(@"Mac-E1008331FDC96864"),
+ @"IOPlatformUUID": @"6F3B2A1E-8C4D-4E5F-9A7B-1D2C3E4F5A6B",
+ @"IOPlatformSerialNumber": @"C02ZL0GVMD6N",
+ };
+ }];
+
+ static NSString* uuid;
+ static NSString* serial;
+ static bool known = hostIdentifiers(&uuid, &serial);
+ if (known)
+ {
+ properties[@"IOPlatformUUID"] = uuid;
+ properties[@"IOPlatformSerialNumber"] = serial;
+ }
+ return properties;
+}
+
+bool IOPlatformExpertDevice::conformsTo(const char* className)