| 1 | /*␊ |
| 2 | * Copyright (c) 2009-2010 Evan Lojewski. All rights reserved.␊ |
| 3 | *␊ |
| 4 | */␊ |
| 5 | ␊ |
| 6 | //#include "libsaio.h"␊ |
| 7 | #include "boot.h"␊ |
| 8 | #include "kernel_patcher.h"␊ |
| 9 | #include "platform.h"␊ |
| 10 | #include "modules.h"␊ |
| 11 | ␊ |
| 12 | extern PlatformInfo_t Platform;␊ |
| 13 | ␊ |
| 14 | patchRoutine_t* patches = NULL;␊ |
| 15 | kernSymbols_t* kernelSymbols = NULL;␊ |
| 16 | ␊ |
| 17 | ␊ |
| 18 | void KernelPatcher_start()␊ |
| 19 | {␊ |
| 20 | ␉register_kernel_patch(patch_cpuid_set_info_all, KERNEL_ANY, CPUID_MODEL_UNKNOWN); ␊ |
| 21 | ␊ |
| 22 | ␉register_kernel_patch(patch_commpage_stuff_routine, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 23 | ␉␊ |
| 24 | ␉register_kernel_patch(patch_lapic_init, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 25 | ␊ |
| 26 | ␉// NOTE: following is currently 32bit only␊ |
| 27 | ␉register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊ |
| 28 | ␊ |
| 29 | ␉␊ |
| 30 | ␉register_kernel_symbol(KERNEL_ANY, "_panic");␊ |
| 31 | ␉register_kernel_symbol(KERNEL_ANY, "_cpuid_set_info");␊ |
| 32 | ␉register_kernel_symbol(KERNEL_ANY, "_pmCPUExitHaltToOff");␊ |
| 33 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_init");␊ |
| 34 | ␉register_kernel_symbol(KERNEL_ANY, "_commpage_stuff_routine");␊ |
| 35 | ␊ |
| 36 | ␉// lapic_configure symbols␊ |
| 37 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_configure");␊ |
| 38 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_start");␊ |
| 39 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt_base");␊ |
| 40 | ␉␊ |
| 41 | ␉// lapic_interrup symbols␊ |
| 42 | ␉//register_kernel_patch(patch_lapic_interrupt, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 43 | ␉//register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt");␊ |
| 44 | ␊ |
| 45 | ␊ |
| 46 | ␉␊ |
| 47 | ␉// TODO: register needed symbols␊ |
| 48 | ␉␊ |
| 49 | ␉␊ |
| 50 | ␉register_hook_callback("ExecKernel", &patch_kernel); ␊ |
| 51 | }␊ |
| 52 | ␊ |
| 53 | /*␊ |
| 54 | * Register a kerenl patch␊ |
| 55 | */␊ |
| 56 | void register_kernel_patch(void* patch, int arch, int cpus)␊ |
| 57 | {␊ |
| 58 | ␉// TODO: only insert valid patches based on current cpuid and architecture␊ |
| 59 | ␉// AKA, don't at 64bit patches if it's a 32bit only machine␊ |
| 60 | ␉patchRoutine_t* entry;␊ |
| 61 | ␉␊ |
| 62 | ␉// TODO: verify Platform.CPU.Model is populated this early in bootup␊ |
| 63 | ␉// Check to ensure that the patch is valid on this machine␊ |
| 64 | ␉// If it is not, exit early form this function␊ |
| 65 | ␉if(cpus != Platform.CPU.Model)␊ |
| 66 | ␉{␊ |
| 67 | ␉␉if(cpus != CPUID_MODEL_ANY)␊ |
| 68 | ␉␉{␊ |
| 69 | ␉␉␉if(cpus == CPUID_MODEL_UNKNOWN)␊ |
| 70 | ␉␉␉{␊ |
| 71 | ␉␉␉␉switch(Platform.CPU.Model)␊ |
| 72 | ␉␉␉␉{␊ |
| 73 | ␉␉␉␉␉case 13:␊ |
| 74 | ␉␉␉␉␉case CPUID_MODEL_YONAH:␊ |
| 75 | ␉␉␉␉␉case CPUID_MODEL_MEROM:␊ |
| 76 | ␉␉␉␉␉case CPUID_MODEL_PENRYN:␊ |
| 77 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM:␊ |
| 78 | ␉␉␉␉␉case CPUID_MODEL_FIELDS:␊ |
| 79 | ␉␉␉␉␉case CPUID_MODEL_DALES:␊ |
| 80 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM_EX:␊ |
| 81 | ␉␉␉␉␉␉// Known cpu's we don't want to add the patch␊ |
| 82 | ␉␉␉␉␉␉return;␊ |
| 83 | ␉␉␉␉␉␉break;␊ |
| 84 | ␊ |
| 85 | ␉␉␉␉␉default:␊ |
| 86 | ␉␉␉␉␉␉// CPU not in supported list, so we are going to add␊ |
| 87 | ␉␉␉␉␉␉// The patch will be applied␊ |
| 88 | ␉␉␉␉␉␉break;␊ |
| 89 | ␉␉␉␉␉␉␊ |
| 90 | ␉␉␉␉}␊ |
| 91 | ␉␉␉}␊ |
| 92 | ␉␉␉else␊ |
| 93 | ␉␉␉{␊ |
| 94 | ␉␉␉␉// Invalid cpuid for current cpu. Ignoring patch␊ |
| 95 | ␉␉␉␉return;␊ |
| 96 | ␉␉␉}␊ |
| 97 | ␊ |
| 98 | ␉␉}␊ |
| 99 | ␉}␊ |
| 100 | ␉␉␊ |
| 101 | ␉if(patches == NULL)␊ |
| 102 | ␉{␊ |
| 103 | ␉␉patches = entry = malloc(sizeof(patchRoutine_t));␊ |
| 104 | ␉}␊ |
| 105 | ␉else␊ |
| 106 | ␉{␊ |
| 107 | ␉␉entry = patches;␊ |
| 108 | ␉␉while(entry->next)␊ |
| 109 | ␉␉{␊ |
| 110 | ␉␉␉entry = entry->next;␊ |
| 111 | ␉␉}␊ |
| 112 | ␉␉␊ |
| 113 | ␉␉entry->next = malloc(sizeof(patchRoutine_t));␊ |
| 114 | ␉␉entry = entry->next;␊ |
| 115 | ␉}␊ |
| 116 | ␉␊ |
| 117 | ␉entry->next = NULL;␊ |
| 118 | ␉entry->patchRoutine = patch;␊ |
| 119 | ␉entry->validArchs = arch;␊ |
| 120 | ␉entry->validCpu = cpus;␊ |
| 121 | }␊ |
| 122 | ␊ |
| 123 | void register_kernel_symbol(int kernelType, const char* name)␊ |
| 124 | {␊ |
| 125 | ␉if(kernelSymbols == NULL)␊ |
| 126 | ␉{␊ |
| 127 | ␉␉kernelSymbols = malloc(sizeof(kernSymbols_t));␊ |
| 128 | ␉␉kernelSymbols->next = NULL;␊ |
| 129 | ␉␉kernelSymbols->symbol = (char*)name;␊ |
| 130 | ␉␉kernelSymbols->addr = 0;␊ |
| 131 | ␉}␊ |
| 132 | ␉else {␊ |
| 133 | ␉␉kernSymbols_t *symbol = kernelSymbols;␊ |
| 134 | ␉␉while(symbol->next != NULL)␊ |
| 135 | ␉␉{␊ |
| 136 | ␉␉␉symbol = symbol->next;␊ |
| 137 | ␉␉}␊ |
| 138 | ␉␉␊ |
| 139 | ␉␉symbol->next = malloc(sizeof(kernSymbols_t));␊ |
| 140 | ␉␉symbol = symbol->next;␊ |
| 141 | ␊ |
| 142 | ␉␉symbol->next = NULL;␊ |
| 143 | ␉␉symbol->symbol = (char*)name;␊ |
| 144 | ␉␉symbol->addr = 0;␊ |
| 145 | ␉}␊ |
| 146 | }␊ |
| 147 | ␊ |
| 148 | kernSymbols_t* lookup_kernel_symbol(const char* name)␊ |
| 149 | {␊ |
| 150 | ␉kernSymbols_t *symbol = kernelSymbols;␊ |
| 151 | ␊ |
| 152 | ␉while(symbol && strcmp(symbol->symbol, name) !=0)␊ |
| 153 | ␉{␊ |
| 154 | ␉␉symbol = symbol->next;␊ |
| 155 | ␉}␊ |
| 156 | ␉␊ |
| 157 | ␉if(!symbol)␊ |
| 158 | ␉{␊ |
| 159 | ␉␉return NULL;␊ |
| 160 | ␉}␊ |
| 161 | ␉else␊ |
| 162 | ␉{␊ |
| 163 | ␉␉return symbol;␊ |
| 164 | ␉}␊ |
| 165 | ␊ |
| 166 | }␊ |
| 167 | ␊ |
| 168 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4)␊ |
| 169 | {␊ |
| 170 | ␉bool␉␉␉patchKernel = false; //Kpatcher - default value.␊ |
| 171 | ␉patchRoutine_t* entry = patches;␊ |
| 172 | ␊ |
| 173 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
| 174 | ␊ |
| 175 | ␉locate_symbols(kernelData);␊ |
| 176 | ␊ |
| 177 | ␉// check if kernel patcher is requested by user.␊ |
| 178 | ␉getBoolForKey(kKPatcherKey, &patchKernel, &bootInfo->bootConfig);␊ |
| 179 | ␊ |
| 180 | ␉if (patches != NULL && patchKernel == true)␊ |
| 181 | ␉{␊ |
| 182 | ␉␉while(entry)␊ |
| 183 | ␉␉{␊ |
| 184 | ␉␉␉if (entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
| 185 | ␉␉␉{␊ |
| 186 | ␉␉␉␉if (entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
| 187 | ␉␉␉}␊ |
| 188 | ␉␉␉entry = entry->next;␊ |
| 189 | ␉␉}␊ |
| 190 | ␉}␊ |
| 191 | }␊ |
| 192 | ␊ |
| 193 | int determineKernelArchitecture(void* kernelData)␊ |
| 194 | {␉␊ |
| 195 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
| 196 | ␉{␊ |
| 197 | ␉␉return KERNEL_32;␊ |
| 198 | ␉}␊ |
| 199 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
| 200 | ␉{␊ |
| 201 | ␉␉return KERNEL_64;␊ |
| 202 | ␉}␊ |
| 203 | ␉else␊ |
| 204 | ␉{␊ |
| 205 | ␉␉return KERNEL_ERR;␊ |
| 206 | ␉}␊ |
| 207 | }␊ |
| 208 | ␊ |
| 209 | ␊ |
| 210 | /**␊ |
| 211 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
| 212 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
| 213 | **/␊ |
| 214 | int locate_symbols(void* kernelData)␊ |
| 215 | {␊ |
| 216 | ␉char is64 = 1;␊ |
| 217 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
| 218 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
| 219 | ␉return 1 << is64;␊ |
| 220 | }␊ |
| 221 | ␊ |
| 222 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
| 223 | {␊ |
| 224 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
| 225 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
| 226 | ␉␊ |
| 227 | ␉␊ |
| 228 | ␉␊ |
| 229 | ␉if(symbol)␊ |
| 230 | ␉{␊ |
| 231 | ␊ |
| 232 | ␉␉//printf("Located %sbit symbol %s at 0x%lX\n", is64 ? "64" : "32", symbolName, addr);␊ |
| 233 | ␉␉//getc();␊ |
| 234 | ␉␉␊ |
| 235 | ␉␉symbol->addr = addr;␊ |
| 236 | ␉}␊ |
| 237 | ␉return 0xFFFFFFFF; // fixme␊ |
| 238 | }␊ |
| 239 | ␊ |
| 240 | ␊ |
| 241 | /**␊ |
| 242 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
| 243 | ** Or replace it so that the cpuid is set to a valid value.␊ |
| 244 | **/␊ |
| 245 | void patch_cpuid_set_info_all(void* kernelData)␊ |
| 246 | {␊ |
| 247 | ␉switch(Platform.CPU.Model)␊ |
| 248 | ␉{␊ |
| 249 | ␉␉case CPUID_MODEL_ATOM:␊ |
| 250 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
| 251 | ␉␉␉{␊ |
| 252 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
| 253 | ␉␉␉}␊ |
| 254 | ␉␉␉else ␊ |
| 255 | ␉␉␉{␊ |
| 256 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
| 257 | ␊ |
| 258 | ␉␉␉}␊ |
| 259 | ␊ |
| 260 | ␉␉␉break;␊ |
| 261 | ␉␉␉␊ |
| 262 | ␉␉default:␊ |
| 263 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
| 264 | ␉␉␉{␊ |
| 265 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, 0, 0);␊ |
| 266 | ␉␉␉}␊ |
| 267 | ␉␉␉else␊ |
| 268 | ␉␉␉{␊ |
| 269 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, 0, 0);␊ |
| 270 | ␉␉␉}␊ |
| 271 | ␊ |
| 272 | ␉␉␉break;␊ |
| 273 | ␉}␊ |
| 274 | }␊ |
| 275 | ␊ |
| 276 | void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
| 277 | {␊ |
| 278 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 279 | ␉␊ |
| 280 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
| 281 | ␉␊ |
| 282 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
| 283 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 284 | ␉␊ |
| 285 | ␉␊ |
| 286 | ␉␊ |
| 287 | //␉UInt32 jumpLocation = 0; unused for now␊ |
| 288 | ␉␊ |
| 289 | ␉␊ |
| 290 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 291 | ␉{␊ |
| 292 | ␉␉printf("Unable to locate _cpuid_set_info\n");␊ |
| 293 | ␉␉return;␊ |
| 294 | ␉␉␊ |
| 295 | ␉}␊ |
| 296 | ␉␊ |
| 297 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 298 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
| 299 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 300 | ␉{␊ |
| 301 | ␉␉printf("Unable to locate _panic\n");␊ |
| 302 | ␉␉return;␊ |
| 303 | ␉}␊ |
| 304 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 305 | ␉␊ |
| 306 | ␉␊ |
| 307 | ␉␊ |
| 308 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
| 309 | ␉while( ␊ |
| 310 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 311 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 312 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 313 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 314 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 315 | ␉␉ )␊ |
| 316 | ␉{␊ |
| 317 | ␉␉patchLocation++;␊ |
| 318 | ␉}␊ |
| 319 | ␉patchLocation--;␊ |
| 320 | ␉␊ |
| 321 | ␉verbose("0x%X 0x%X 0x%X 0x%X 0x%X\n", bytes[patchLocation ], bytes[patchLocation +1], bytes[patchLocation +2], bytes[patchLocation +3], bytes[patchLocation +4]);␊ |
| 322 | ␉␊ |
| 323 | ␉// Remove panic just in case␊ |
| 324 | ␉// The panic instruction is exactly 5 bytes long.␊ |
| 325 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 326 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 327 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 328 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 329 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 330 | ␉verbose("0x%X 0x%X 0x%X 0x%X 0x%X\n", bytes[patchLocation ], bytes[patchLocation +1], bytes[patchLocation +2], bytes[patchLocation +3], bytes[patchLocation +4]);␊ |
| 331 | ␉␊ |
| 332 | ␉// Check for a 10.2.0+ kernel␊ |
| 333 | ␉if(bytes[patchLocation - 19] == 0xC7 && bytes[patchLocation - 18] == 0x05)␊ |
| 334 | ␉{␊ |
| 335 | ␉␉␊ |
| 336 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 17] << 0 |␊ |
| 337 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 16] << 8 |␊ |
| 338 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 15] << 16 |␊ |
| 339 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 24;␊ |
| 340 | ␉␉␊ |
| 341 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
| 342 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 310; ␊ |
| 343 | ␉␉␊ |
| 344 | ␉␉␊ |
| 345 | ␉␉//ffffff8000228b3b -> 0x00490e8b␊ |
| 346 | ␉␉//ffffff8000228c28 -> -237 -> 0x490D9E -> -310␊ |
| 347 | ␉␉␊ |
| 348 | ␉␉␊ |
| 349 | ␉␉// The mov is 10 bytes␊ |
| 350 | ␉␉/*␊ |
| 351 | ␉␉ bytes[patchLocation - 19] = 0x90;␉// c7␊ |
| 352 | ␉␉ bytes[patchLocation - 18] = 0x90;␉// 05␊ |
| 353 | ␉␉ bytes[patchLocation - 17] = 0x90;␉// family location␊ |
| 354 | ␉␉ bytes[patchLocation - 16] = 0x90;␉// family location␊ |
| 355 | ␉␉ bytes[patchLocation - 15] = 0x90;␉// family location␊ |
| 356 | ␉␉ bytes[patchLocation - 14] = 0x90;␉// family location␊ |
| 357 | ␉␉ */␊ |
| 358 | ␉␉bytes[patchLocation - 13] = (impersonateFamily & 0x000000FF) >> 0;␊ |
| 359 | ␉␉bytes[patchLocation - 12] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
| 360 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
| 361 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0xFF000000) >> 24;␊ |
| 362 | ␉␉␊ |
| 363 | ␉␉␊ |
| 364 | ␉␉// The lea (%rip),%rip is 7 bytes␊ |
| 365 | ␉␉bytes[patchLocation - 9] = 0xC7;␊ |
| 366 | ␉␉bytes[patchLocation - 8] = 0x05;␊ |
| 367 | ␉␉bytes[patchLocation - 7] = ((cpuid_model_addr -10) & 0x000000FF) >> 0;␉// NOTE: this opcode is relative in 64bit mode, subtract offset␊ |
| 368 | ␉␉bytes[patchLocation - 6] = ((cpuid_model_addr -10) & 0x0000FF00) >> 8;␉␊ |
| 369 | ␉␉bytes[patchLocation - 5] = ((cpuid_model_addr -10) & 0x00FF0000) >> 16;␊ |
| 370 | ␉␉bytes[patchLocation - 4] = ((cpuid_model_addr -10) & 0xFF000000) >> 24;␊ |
| 371 | ␉␉bytes[patchLocation - 3] = impersonateModel;␉// cpuid_model␊ |
| 372 | ␉␉␊ |
| 373 | ␉␉ ␊ |
| 374 | ␉␉ ␊ |
| 375 | ␉␉ // The xor eax eax is 2 bytes␊ |
| 376 | ␉␉bytes[patchLocation - 2] = 0x01;␉// cpuid_extmodel␊ |
| 377 | ␉␉bytes[patchLocation - 1] = 0x00;␉// cpuid_extfamily␊ |
| 378 | ␉␉␊ |
| 379 | ␉␉// The panic instruction is exactly 5 bytes long.␊ |
| 380 | ␉␉bytes[patchLocation - 0] = 0x02;␉// cpuid_stepping␊ |
| 381 | ␉␉/*bytes[patchLocation + 1] = 0x90;␊ |
| 382 | ␉␉bytes[patchLocation + 2] = 0x90;␊ |
| 383 | ␉␉bytes[patchLocation + 3] = 0x90;␊ |
| 384 | ␉␉bytes[patchLocation + 4] = 0x90;␊ |
| 385 | ␉␉*/␊ |
| 386 | ␉␉␊ |
| 387 | ␉␉// Panic call has been removed.␊ |
| 388 | ␉␉// Override the CPUID now. This requires ~ 10 bytes on 10.0.0 kernels␊ |
| 389 | ␉␉// On 10.2.0+ kernels, this requires ~16 bytes␊ |
| 390 | ␉␉␊ |
| 391 | ␉␉// Total: 24 bytes␊ |
| 392 | ␉␉printf("Running on a 10.2.0+ kernel\n");␊ |
| 393 | ␉␉getc();␊ |
| 394 | ␊ |
| 395 | ␉}␊ |
| 396 | ␉else {␊ |
| 397 | ␉␉printf("Running on a 10.0.0 kernel, patch unsupported\n");␊ |
| 398 | ␉␉getc();␊ |
| 399 | ␉}␊ |
| 400 | ␊ |
| 401 | ␉␊ |
| 402 | }␊ |
| 403 | ␊ |
| 404 | void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
| 405 | {␊ |
| 406 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 407 | ␉␊ |
| 408 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
| 409 | ␊ |
| 410 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
| 411 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 412 | ␉␊ |
| 413 | ␉␊ |
| 414 | ␊ |
| 415 | ␉UInt32 jumpLocation = 0;␊ |
| 416 | ␉␊ |
| 417 | ␉␊ |
| 418 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 419 | ␉{␊ |
| 420 | ␉␉printf("Unable to locate _cpuid_set_info\n");␊ |
| 421 | ␉␉return;␊ |
| 422 | ␉␉␊ |
| 423 | ␉}␊ |
| 424 | ␊ |
| 425 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 426 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
| 427 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 428 | ␉{␊ |
| 429 | ␉␉printf("Unable to locate _panic\n");␊ |
| 430 | ␉␉return;␊ |
| 431 | ␉}␊ |
| 432 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 433 | ␊ |
| 434 | ␉␊ |
| 435 | ␉␊ |
| 436 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
| 437 | ␉while( ␊ |
| 438 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 439 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 440 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 441 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 442 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 443 | ␉␉ )␊ |
| 444 | ␉{␊ |
| 445 | ␉␉patchLocation++;␊ |
| 446 | ␉}␊ |
| 447 | ␉patchLocation--;␊ |
| 448 | ␉␊ |
| 449 | ␉verbose("0x%X 0x%X 0x%X 0x%X 0x%X\n", bytes[patchLocation ], bytes[patchLocation +1], bytes[patchLocation +2], bytes[patchLocation +3], bytes[patchLocation +4]);␊ |
| 450 | ␊ |
| 451 | ␉// Remove panic call, just in case the following patch routines fail␊ |
| 452 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 453 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 454 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 455 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 456 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 457 | ␉verbose("0x%X 0x%X 0x%X 0x%X 0x%X\n", bytes[patchLocation ], bytes[patchLocation +1], bytes[patchLocation +2], bytes[patchLocation +3], bytes[patchLocation +4]);␊ |
| 458 | ␉␊ |
| 459 | ␉␊ |
| 460 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
| 461 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
| 462 | ␉jumpLocation = patchLocation - 15;␊ |
| 463 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
| 464 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -8)) &&␊ |
| 465 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
| 466 | ␉{␊ |
| 467 | ␉␉jumpLocation--;␊ |
| 468 | ␉}␊ |
| 469 | ␉␊ |
| 470 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
| 471 | ␉if(impersonateFamily &&␊ |
| 472 | ␉ impersonateModel &&␊ |
| 473 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
| 474 | ␉{␊ |
| 475 | ␉␉␊ |
| 476 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
| 477 | ␉␉␊ |
| 478 | ␉␉/* ␊ |
| 479 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
| 480 | ␉␉ */␊ |
| 481 | ␉␉␊ |
| 482 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
| 483 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
| 484 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
| 485 | ␉␉bytes[patchLocation - 14] << 8 |␊ |
| 486 | ␉␉bytes[patchLocation - 13] << 16 |␊ |
| 487 | ␉␉bytes[patchLocation - 12] << 24;␊ |
| 488 | ␉␉␊ |
| 489 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
| 490 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 299; ␊ |
| 491 | ␉␉␊ |
| 492 | ␉␉␊ |
| 493 | ␉␉// cpufamily␊ |
| 494 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
| 495 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
| 496 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
| 497 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
| 498 | ␉␉␊ |
| 499 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
| 500 | ␉␉// nop and continue with the rest of the patch␊ |
| 501 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
| 502 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
| 503 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
| 504 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
| 505 | ␉␉␊ |
| 506 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
| 507 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
| 508 | ␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
| 509 | ␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
| 510 | ␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
| 511 | ␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
| 512 | ␉␉␊ |
| 513 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
| 514 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
| 515 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
| 516 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
| 517 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
| 518 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
| 519 | ␉␉␊ |
| 520 | ␉}␊ |
| 521 | ␉else if(impersonateFamily && impersonateModel)␊ |
| 522 | ␉{␊ |
| 523 | ␉␉// pre 10.6.2 kernel␊ |
| 524 | ␉␉// Locate the jump to directly *after* the panic call,␊ |
| 525 | ␉␉jumpLocation = patchLocation - 4;␊ |
| 526 | ␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
| 527 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
| 528 | ␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
| 529 | ␉␉{␊ |
| 530 | ␉␉␉jumpLocation--;␊ |
| 531 | ␉␉}␊ |
| 532 | ␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
| 533 | ␉␉// I'll just leave it to verify the binary stucture.␊ |
| 534 | ␉␉␊ |
| 535 | ␉␉// NOTE: the cpumodel_familt data is not set in _cpuid_set_info␊ |
| 536 | ␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
| 537 | ␉␉// we set now.␊ |
| 538 | ␉␉␊ |
| 539 | ␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
| 540 | ␉␉{␊ |
| 541 | ␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
| 542 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
| 543 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
| 544 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
| 545 | ␉␉␉// Remove jump␊ |
| 546 | ␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
| 547 | ␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
| 548 | ␉␉␉␊ |
| 549 | ␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
| 550 | ␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
| 551 | ␉␉␉␊ |
| 552 | ␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
| 553 | ␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
| 554 | ␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
| 555 | ␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
| 556 | ␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
| 557 | ␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
| 558 | ␉␉␉␊ |
| 559 | ␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
| 560 | ␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
| 561 | ␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
| 562 | ␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
| 563 | ␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
| 564 | ␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
| 565 | ␉␉␉␊ |
| 566 | ␉␉␉␊ |
| 567 | ␉␉␉␊ |
| 568 | ␉␉␉patchLocation = jumpLocation;␊ |
| 569 | ␉␉␉// We now have 14 bytes available for a patch␊ |
| 570 | ␉␉␉␊ |
| 571 | ␉␉}␊ |
| 572 | ␉␉else ␊ |
| 573 | ␉␉{␊ |
| 574 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
| 575 | ␉␉}␊ |
| 576 | ␉}␊ |
| 577 | ␉else ␊ |
| 578 | ␉{␊ |
| 579 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
| 580 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
| 581 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
| 582 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
| 583 | ␉}␊ |
| 584 | }␊ |
| 585 | ␊ |
| 586 | ␊ |
| 587 | /**␊ |
| 588 | ** SleepEnabler.kext replacement (for those that need it)␊ |
| 589 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
| 590 | **/␊ |
| 591 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
| 592 | {␊ |
| 593 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 594 | ␊ |
| 595 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
| 596 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
| 597 | ␉␊ |
| 598 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 599 | ␉{␊ |
| 600 | ␉␉printf("Unable to locate _pmCPUExitHaltToOff\n");␊ |
| 601 | ␉␉return;␊ |
| 602 | ␉}␊ |
| 603 | ␉␊ |
| 604 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 605 | ␉␊ |
| 606 | ␉␊ |
| 607 | ␉␊ |
| 608 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
| 609 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
| 610 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
| 611 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
| 612 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
| 613 | ␊ |
| 614 | ␉{␊ |
| 615 | ␉␉patchLocation++;␊ |
| 616 | ␉}␊ |
| 617 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
| 618 | }␊ |
| 619 | ␊ |
| 620 | void patch_lapic_init(void* kernelData)␊ |
| 621 | {␊ |
| 622 | ␊ |
| 623 | ␉UInt8 panicIndex = 0;␊ |
| 624 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 625 | ␉␊ |
| 626 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
| 627 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
| 628 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 629 | ␉{␊ |
| 630 | ␉␉printf("Unable to locate %s\n", "_lapic_init");␊ |
| 631 | ␉␉return;␊ |
| 632 | ␉␉␊ |
| 633 | ␉}␊ |
| 634 | ␉␊ |
| 635 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 636 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
| 637 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 638 | ␉{␊ |
| 639 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
| 640 | ␉␉return;␊ |
| 641 | ␉}␊ |
| 642 | ␉␊ |
| 643 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 644 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
| 645 | ␊ |
| 646 | ␉␊ |
| 647 | ␉␊ |
| 648 | ␉␊ |
| 649 | ␉// Locate the (panicIndex + 1) panic call␊ |
| 650 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
| 651 | ␉{␊ |
| 652 | ␉␉while( ␊ |
| 653 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 654 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 655 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 656 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 657 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 658 | ␉␉␉ )␊ |
| 659 | ␉␉{␊ |
| 660 | ␉␉␉patchLocation++;␊ |
| 661 | ␉␉}␊ |
| 662 | ␉␉patchLocation++;␊ |
| 663 | ␉␉panicIndex++;␊ |
| 664 | ␉}␊ |
| 665 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
| 666 | ␉␊ |
| 667 | ␉bytes[--patchLocation] = 0x90;␉␊ |
| 668 | ␉bytes[++patchLocation] = 0x90;␊ |
| 669 | ␉bytes[++patchLocation] = 0x90;␊ |
| 670 | ␉bytes[++patchLocation] = 0x90;␊ |
| 671 | ␉bytes[++patchLocation] = 0x90;␊ |
| 672 | ␉␊ |
| 673 | ␉␊ |
| 674 | }␊ |
| 675 | ␊ |
| 676 | ␊ |
| 677 | void patch_commpage_stuff_routine(void* kernelData)␊ |
| 678 | {␊ |
| 679 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 680 | ␊ |
| 681 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
| 682 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 683 | ␉{␊ |
| 684 | ␉␉verbose("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
| 685 | ␉␉return;␊ |
| 686 | ␉␉␊ |
| 687 | ␉}␊ |
| 688 | ␉␊ |
| 689 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 690 | ␊ |
| 691 | ␉␊ |
| 692 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 693 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 694 | ␉{␊ |
| 695 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
| 696 | ␉␉return;␊ |
| 697 | ␉}␊ |
| 698 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
| 699 | ␊ |
| 700 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 701 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 702 | ␉␊ |
| 703 | ␉while( ␊ |
| 704 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 705 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 706 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 707 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 708 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 709 | ␉␉ )␊ |
| 710 | ␉{␊ |
| 711 | ␉␉patchLocation++;␊ |
| 712 | ␉}␊ |
| 713 | ␉patchLocation--;␊ |
| 714 | ␉␊ |
| 715 | ␉// Replace panic with nops␊ |
| 716 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 717 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 718 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 719 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 720 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 721 | ␉␊ |
| 722 | ␉␊ |
| 723 | }␊ |
| 724 | ␊ |
| 725 | void patch_lapic_interrupt(void* kernelData)␊ |
| 726 | {␊ |
| 727 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
| 728 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 729 | ␉␊ |
| 730 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
| 731 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 732 | ␉{␊ |
| 733 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt");␊ |
| 734 | ␉␉return;␊ |
| 735 | ␉␉␊ |
| 736 | ␉}␊ |
| 737 | ␉␊ |
| 738 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 739 | ␉␊ |
| 740 | ␉␊ |
| 741 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 742 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 743 | ␉{␊ |
| 744 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
| 745 | ␉␉return;␊ |
| 746 | ␉}␊ |
| 747 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
| 748 | ␉␊ |
| 749 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 750 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 751 | ␉␊ |
| 752 | ␉while( ␊ |
| 753 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 754 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 755 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 756 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 757 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 758 | ␉␉ )␊ |
| 759 | ␉{␊ |
| 760 | ␉␉patchLocation++;␊ |
| 761 | ␉}␊ |
| 762 | ␉patchLocation--;␊ |
| 763 | ␉␊ |
| 764 | ␉// Replace panic with nops␊ |
| 765 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 766 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 767 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 768 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 769 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 770 | ␉␊ |
| 771 | ␉␊ |
| 772 | }␊ |
| 773 | ␊ |
| 774 | ␊ |
| 775 | void patch_lapic_configure(void* kernelData)␊ |
| 776 | {␊ |
| 777 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 778 | ␉␊ |
| 779 | ␉UInt32 patchLocation;␊ |
| 780 | ␉UInt32 lapicStart;␊ |
| 781 | ␉UInt32 lapicInterruptBase;␊ |
| 782 | ␉␊ |
| 783 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
| 784 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 785 | ␉{␊ |
| 786 | ␉␉printf("Unable to locate %s\n", "_lapic_configure");␊ |
| 787 | ␉␉return;␊ |
| 788 | ␉}␊ |
| 789 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 790 | ␉␊ |
| 791 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
| 792 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 793 | ␉{␊ |
| 794 | ␉␉printf("Unable to locate %s\n", "_lapic_start");␊ |
| 795 | ␉␉return;␊ |
| 796 | ␉}␊ |
| 797 | ␉lapicStart = symbol->addr; ␊ |
| 798 | ␊ |
| 799 | ␊ |
| 800 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
| 801 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 802 | ␉{␊ |
| 803 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
| 804 | ␉␉return;␊ |
| 805 | ␉}␊ |
| 806 | ␉lapicInterruptBase = symbol->addr;␊ |
| 807 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 808 | ␉lapicStart -= (UInt32)kernelData;␊ |
| 809 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
| 810 | ␉␊ |
| 811 | ␉␊ |
| 812 | ␉// Looking for the following:␊ |
| 813 | ␉//movl _lapic_start,%e_x␊ |
| 814 | ␉//addl $0x00000320,%e_x␊ |
| 815 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
| 816 | ␉while( ␊ |
| 817 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
| 818 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
| 819 | ␉␉ ( lapicStart != (UInt32)(␊ |
| 820 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
| 821 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
| 822 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
| 823 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
| 824 | ␉␉␉␉␉␉␉␉␉)␊ |
| 825 | ␉␉␉␉␉␉␉␉ )␊ |
| 826 | ␉␉ ) || ␊ |
| 827 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
| 828 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
| 829 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
| 830 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
| 831 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
| 832 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
| 833 | ␊ |
| 834 | ␉␉ )␊ |
| 835 | ␉{␊ |
| 836 | ␉␉patchLocation++;␊ |
| 837 | ␉}␊ |
| 838 | ␉patchLocation-=2;␊ |
| 839 | ␊ |
| 840 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
| 841 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
| 842 | ␉␊ |
| 843 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
| 844 | ␉/*␊ |
| 845 | ␉bytes[patchLocation++] = 0x8B;␊ |
| 846 | ␉bytes[patchLocation++] = 0x15;␊ |
| 847 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
| 848 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
| 849 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
| 850 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
| 851 | ␉*/␊ |
| 852 | ␉patchLocation += 6;␊ |
| 853 | ␉␊ |
| 854 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
| 855 | ␉/*␊ |
| 856 | ␉bytes[patchLocation++] = 0x81;␊ |
| 857 | ␉bytes[patchLocation++] = 0xC2;␊ |
| 858 | ␉*/␊ |
| 859 | ␉patchLocation += 2;␊ |
| 860 | ␉bytes[patchLocation++] = 0x60;␊ |
| 861 | ␉/*␊ |
| 862 | ␉bytes[patchLocation++];// = 0x03;␊ |
| 863 | ␉bytes[patchLocation++];// = 0x00;␊ |
| 864 | ␉bytes[patchLocation++];// = 0x00;␊ |
| 865 | ␉*/␊ |
| 866 | ␉ patchLocation += 3;␊ |
| 867 | ␊ |
| 868 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
| 869 | ␉bytes[patchLocation++] = 0xC7;␊ |
| 870 | ␉bytes[patchLocation++] = 0x02;␊ |
| 871 | ␉bytes[patchLocation++] = 0x00;␊ |
| 872 | ␉bytes[patchLocation++] = 0x04;␊ |
| 873 | ␉bytes[patchLocation++] = 0x00;␊ |
| 874 | ␉bytes[patchLocation++] = 0x00;␊ |
| 875 | ␉␊ |
| 876 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
| 877 | ␉bytes[patchLocation++] = 0x83;␊ |
| 878 | ␉bytes[patchLocation++] = 0xEA;␊ |
| 879 | ␉bytes[patchLocation++] = 0x40;␊ |
| 880 | ␊ |
| 881 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 882 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 883 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 884 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 885 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 886 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 887 | ␊ |
| 888 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
| 889 | ␉bytes[patchLocation++] = 0x83;␊ |
| 890 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 891 | ␉bytes[patchLocation++] = 0x0E;␊ |
| 892 | ␊ |
| 893 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 894 | ␉bytes[patchLocation++] = 0x89;␊ |
| 895 | ␉bytes[patchLocation++] = 0x02;␊ |
| 896 | ␉␊ |
| 897 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
| 898 | ␉bytes[patchLocation++] = 0x81;␊ |
| 899 | ␉bytes[patchLocation++] = 0xC2;␊ |
| 900 | ␉bytes[patchLocation++] = 0x30;␊ |
| 901 | ␉bytes[patchLocation++] = 0x03;␊ |
| 902 | ␉bytes[patchLocation++] = 0x00;␊ |
| 903 | ␉bytes[patchLocation++] = 0x00;␊ |
| 904 | ␉␊ |
| 905 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 906 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 907 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 908 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 909 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 910 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 911 | ␉␊ |
| 912 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
| 913 | ␉bytes[patchLocation++] = 0x83;␊ |
| 914 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 915 | ␉bytes[patchLocation++] = 0x0F;␊ |
| 916 | ␉␊ |
| 917 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 918 | ␉bytes[patchLocation++] = 0x89;␊ |
| 919 | ␉bytes[patchLocation++] = 0x02;␊ |
| 920 | ␉␊ |
| 921 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
| 922 | ␉bytes[patchLocation++] = 0x83;␊ |
| 923 | ␉bytes[patchLocation++] = 0xEA;␊ |
| 924 | ␉bytes[patchLocation++] = 0x10;␊ |
| 925 | ␊ |
| 926 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 927 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 928 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 929 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 930 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 931 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 932 | ␉␊ |
| 933 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
| 934 | ␉bytes[patchLocation++] = 0x83;␊ |
| 935 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 936 | ␉bytes[patchLocation++] = 0x0C;␊ |
| 937 | ␊ |
| 938 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 939 | ␉bytes[patchLocation++] = 0x89;␊ |
| 940 | ␉bytes[patchLocation++] = 0x02;␊ |
| 941 | ␊ |
| 942 | ␉// Replace remaining with nops␊ |
| 943 | ␊ |
| 944 | ␊ |
| 945 | ␉bytes[patchLocation++] = 0x90;␊ |
| 946 | ␉bytes[patchLocation++] = 0x90;␊ |
| 947 | ␉bytes[patchLocation++] = 0x90;␊ |
| 948 | ␉bytes[patchLocation++] = 0x90;␊ |
| 949 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
| 950 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
| 951 | }␊ |
| 952 | |
