1 /*
2 * Copyright (c) 2024 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 #include <IOKit/IOProviderPropertyMerger.h>
30 #include <IOKit/IOService.h>
31
32 #define super IOService
33 OSDefineMetaClassAndStructors(IOProviderPropertyMerger, IOService);
34
35 bool
init(OSDictionary * dictionary)36 IOProviderPropertyMerger::init(OSDictionary * dictionary)
37 {
38 OSDictionary *mergeProperties = OSDynamicCast(OSDictionary, dictionary->getObject(kIOProviderMergePropertiesKey));
39 OSDictionary *parentMergeProperties = OSDynamicCast(OSDictionary, dictionary->getObject(kIOProviderParentMergePropertiesKey));
40
41 // remove security-sensitive properties from the dictionary used to merge properties to provider
42 if (mergeProperties) {
43 mergeProperties->removeObject(gIOServiceDEXTEntitlementsKey);
44 }
45 if (parentMergeProperties) {
46 parentMergeProperties->removeObject(gIOServiceDEXTEntitlementsKey);
47 }
48
49 return super::init(dictionary);
50 }
51
52 bool
setProperty(const OSSymbol * aKey,OSObject * anObject)53 IOProviderPropertyMerger::setProperty(const OSSymbol * aKey, OSObject * anObject)
54 {
55 // Disallow modifying security-sensitive properties
56 if (aKey->isEqualTo(kIOProviderMergePropertiesKey) || aKey->isEqualTo(kIOProviderParentMergePropertiesKey)) {
57 return false;
58 }
59 return super::setProperty(aKey, anObject);
60 }
61
62 void
setPropertyTable(OSDictionary * dict __unused)63 IOProviderPropertyMerger::setPropertyTable(OSDictionary * dict __unused)
64 {
65 // Disallow changing the entire property table since that can change security-sensitive properties
66 }
67