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| 1 | +// |
| 2 | +// kern_start.cpp |
| 3 | +// Polaris22Fixup |
| 4 | +// |
| 5 | +// Copyright © 2020 osy86. All rights reserved. |
| 6 | +// |
| 7 | + |
| 8 | +#include <Headers/plugin_start.hpp> |
| 9 | +#include <Headers/kern_api.hpp> |
| 10 | + |
| 11 | +#define UNLIKELY(x) __builtin_expect(!!(x), 0) |
| 12 | +#define MODULE_SHORT "p22" |
| 13 | + |
| 14 | +extern "C" void *memmem(const void *h0, size_t k, const void *n0, size_t l); |
| 15 | + |
| 16 | +static const int kPathMaxLen = 1024; |
| 17 | + |
| 18 | +#pragma mark - Patches |
| 19 | + |
| 20 | +static const uint8_t kAmdBronzeMtlAddrLibGetBaseArrayModeReturnOriginal[] = { |
| 21 | + 0xb8, 0x02, 0x00, 0x00, 0x00, 0x0f, 0x43, 0xc1, 0xeb, |
| 22 | +}; |
| 23 | + |
| 24 | +static const uint8_t kAmdBronzeMtlAddrLibGetBaseArrayModeReturnPatched[] = { |
| 25 | + 0xb8, 0x02, 0x00, 0x00, 0x00, 0x90, 0x90, 0x90, 0xeb, |
| 26 | +}; |
| 27 | + |
| 28 | +static const char kAmdBronzeMtlDriverPath[] = "/System/Library/Extensions/AMDMTLBronzeDriver.bundle/Contents/MacOS/AMDMTLBronzeDriver"; |
| 29 | + |
| 30 | +static const char kDyldCachePath[] = "/private/var/db/dyld/dyld_shared_cache_x86_64h"; |
| 31 | + |
| 32 | +static const char *kAmdRadeonX4000HwLibsPath[] { "/System/Library/Extensions/AMDRadeonX4000HWServices.kext/Contents/PlugIns/AMDRadeonX4000HWLibs.kext/Contents/MacOS/AMDRadeonX4000HWLibs" }; |
| 33 | + |
| 34 | +static KernelPatcher::KextInfo kAMDHWLibsInfo[] = { |
| 35 | + { "com.apple.kext.AMDRadeonX4000HWLibs", kAmdRadeonX4000HwLibsPath, arrsize(kAmdRadeonX4000HwLibsPath), {true}, {}, KernelPatcher::KextInfo::Unloaded }, |
| 36 | +}; |
| 37 | + |
| 38 | +static mach_vm_address_t orig_cs_validate_range {}; |
| 39 | + |
| 40 | +static mach_vm_address_t orig_IsEarlySAMUInitEnabled {}; |
| 41 | + |
| 42 | +#pragma mark - Kernel patching code |
| 43 | + |
| 44 | +/** |
| 45 | + * Call block with interrupts and protections disabled |
| 46 | + */ |
| 47 | +static void doKernelPatch(void (^patchFunc)(void)) { |
| 48 | + if (MachInfo::setKernelWriting(true, KernelPatcher::kernelWriteLock) == KERN_SUCCESS) { |
| 49 | + DBGLOG(MODULE_SHORT, "obtained write permssions"); |
| 50 | + } else { |
| 51 | + SYSLOG(MODULE_SHORT, "failed to obtain write permissions"); |
| 52 | + return; |
| 53 | + } |
| 54 | + |
| 55 | + patchFunc(); |
| 56 | + |
| 57 | + if (MachInfo::setKernelWriting(false, KernelPatcher::kernelWriteLock) == KERN_SUCCESS) { |
| 58 | + DBGLOG(MODULE_SHORT, "restored write permssions"); |
| 59 | + } else { |
| 60 | + SYSLOG(MODULE_SHORT, "failed to restore write permissions"); |
| 61 | + } |
| 62 | +} |
| 63 | + |
| 64 | +#pragma mark - Patched functions |
| 65 | + |
| 66 | +static boolean_t patched_cs_validate_range(vnode_t vp, |
| 67 | + memory_object_t pager, |
| 68 | + memory_object_offset_t offset, |
| 69 | + const void *data, |
| 70 | + vm_size_t size, |
| 71 | + unsigned *result) { |
| 72 | + char path[kPathMaxLen]; |
| 73 | + int pathlen = kPathMaxLen; |
| 74 | + boolean_t res = FunctionCast(patched_cs_validate_range, orig_cs_validate_range)(vp, pager, offset, data, size, result); |
| 75 | + if (res && vn_getpath(vp, path, &pathlen) == 0) { |
| 76 | + static_assert(sizeof(kAmdBronzeMtlDriverPath) <= sizeof(path), "path too long"); |
| 77 | + static_assert(sizeof(kDyldCachePath) <= sizeof(path), "path too long"); |
| 78 | + if (UNLIKELY(strncmp(path, kAmdBronzeMtlDriverPath, sizeof(kAmdBronzeMtlDriverPath)) == 0) || |
| 79 | + UNLIKELY(strncmp(path, kDyldCachePath, sizeof(kDyldCachePath)) == 0)) { |
| 80 | + void *res; |
| 81 | + if (UNLIKELY((res = memmem(data, size, kAmdBronzeMtlAddrLibGetBaseArrayModeReturnOriginal, sizeof(kAmdBronzeMtlAddrLibGetBaseArrayModeReturnOriginal))) != NULL)) { |
| 82 | + SYSLOG(MODULE_SHORT, "found function to patch!"); |
| 83 | + doKernelPatch(^{ |
| 84 | + static_assert(sizeof(kAmdBronzeMtlAddrLibGetBaseArrayModeReturnOriginal) == sizeof(kAmdBronzeMtlAddrLibGetBaseArrayModeReturnPatched), "patch size invalid"); |
| 85 | + lilu_os_memcpy(res, kAmdBronzeMtlAddrLibGetBaseArrayModeReturnPatched, sizeof(kAmdBronzeMtlAddrLibGetBaseArrayModeReturnPatched)); |
| 86 | + }); |
| 87 | + } |
| 88 | + } |
| 89 | + } |
| 90 | + return res; |
| 91 | +} |
| 92 | + |
| 93 | +static int patched_IsEarlySAMUInitEnabled(void *ctx) { |
| 94 | + DBGLOG(MODULE_SHORT, "PECI_IsEarlySAMUInitEnabled: return 0"); |
| 95 | + return 0; |
| 96 | +} |
| 97 | + |
| 98 | +#pragma mark - Patches on start/stop |
| 99 | + |
| 100 | +static void pluginStart() { |
| 101 | + LiluAPI::Error error; |
| 102 | + |
| 103 | + DBGLOG(MODULE_SHORT, "start"); |
| 104 | + error = lilu.onPatcherLoad([](void *user, KernelPatcher &patcher){ |
| 105 | + DBGLOG(MODULE_SHORT, "patching cs_validate_range"); |
| 106 | + mach_vm_address_t kern = patcher.solveSymbol(KernelPatcher::KernelID, "_cs_validate_range"); |
| 107 | + |
| 108 | + if (patcher.getError() == KernelPatcher::Error::NoError) { |
| 109 | + orig_cs_validate_range = patcher.routeFunctionLong(kern, reinterpret_cast<mach_vm_address_t>(patched_cs_validate_range), true, true); |
| 110 | + |
| 111 | + if (patcher.getError() != KernelPatcher::Error::NoError) { |
| 112 | + SYSLOG(MODULE_SHORT, "failed to hook _cs_validate_range"); |
| 113 | + } else { |
| 114 | + DBGLOG(MODULE_SHORT, "hooked cs_validate_range"); |
| 115 | + } |
| 116 | + } else { |
| 117 | + SYSLOG(MODULE_SHORT, "failed to find _cs_validate_range"); |
| 118 | + } |
| 119 | + }); |
| 120 | + if (error != LiluAPI::Error::NoError) { |
| 121 | + SYSLOG(MODULE_SHORT, "failed to register onPatcherLoad method: %d", error); |
| 122 | + } |
| 123 | + error = lilu.onKextLoad(kAMDHWLibsInfo, arrsize(kAMDHWLibsInfo), [](void *user, KernelPatcher &patcher, size_t index, mach_vm_address_t address, size_t size){ |
| 124 | + DBGLOG(MODULE_SHORT, "processing AMDRadeonX4000HWLibs"); |
| 125 | + for (size_t i = 0; i < arrsize(kAMDHWLibsInfo); i++) { |
| 126 | + if (kAMDHWLibsInfo[i].loadIndex == index) { |
| 127 | + KernelPatcher::RouteRequest amd_requests[] { |
| 128 | + KernelPatcher::RouteRequest("_PECI_IsEarlySAMUInitEnabled", patched_IsEarlySAMUInitEnabled, orig_IsEarlySAMUInitEnabled), |
| 129 | + }; |
| 130 | + if (patcher.routeMultiple(index, amd_requests, address, size, true, true)) { |
| 131 | + DBGLOG(MODULE_SHORT, "patched PECI_IsEarlySAMUInitEnabled"); |
| 132 | + } else { |
| 133 | + SYSLOG(MODULE_SHORT, "failed to patch PECI_IsEarlySAMUInitEnabled: %d", patcher.getError()); |
| 134 | + } |
| 135 | + } |
| 136 | + } |
| 137 | + }); |
| 138 | + if (error != LiluAPI::Error::NoError) { |
| 139 | + SYSLOG(MODULE_SHORT, "failed to register onKextLoad method: %d", error); |
| 140 | + } |
| 141 | +} |
| 142 | + |
| 143 | +// Boot args. |
| 144 | +static const char *bootargOff[] { |
| 145 | + "-polaris22off" |
| 146 | +}; |
| 147 | +static const char *bootargDebug[] { |
| 148 | + "-polaris22dbg" |
| 149 | +}; |
| 150 | +static const char *bootargBeta[] { |
| 151 | + "-polaris22beta" |
| 152 | +}; |
| 153 | + |
| 154 | +// Plugin configuration. |
| 155 | +PluginConfiguration ADDPR(config) { |
| 156 | + xStringify(PRODUCT_NAME), |
| 157 | + parseModuleVersion(xStringify(MODULE_VERSION)), |
| 158 | + LiluAPI::AllowNormal, |
| 159 | + bootargOff, |
| 160 | + arrsize(bootargOff), |
| 161 | + bootargDebug, |
| 162 | + arrsize(bootargDebug), |
| 163 | + bootargBeta, |
| 164 | + arrsize(bootargBeta), |
| 165 | + KernelVersion::Mojave, |
| 166 | + KernelVersion::Catalina, |
| 167 | + pluginStart |
| 168 | +}; |
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