| 1 | /*␊ |
| 2 | * Copyright (c) 2009-2010 Evan Lojewski. All rights reserved.␊ |
| 3 | *␊ |
| 4 | */␊ |
| 5 | ␊ |
| 6 | #include "libsaio.h"␊ |
| 7 | #include "kernel_patcher.h"␊ |
| 8 | #include "platform.h"␊ |
| 9 | #include "modules.h"␊ |
| 10 | ␊ |
| 11 | #ifndef DEBUG_KERNEL_PATCHER␊ |
| 12 | #define DEBUG_KERNEL_PATCHER 0␊ |
| 13 | #endif␊ |
| 14 | ␊ |
| 15 | #if DEBUG_KERNEL_PATCHER␊ |
| 16 | #define DBG(x...)␉printf(x)␊ |
| 17 | #else␊ |
| 18 | #define DBG(x...)␊ |
| 19 | #endif␊ |
| 20 | ␊ |
| 21 | long long symbol_handler(char* module, char* symbolName, long long addr, char is64);␊ |
| 22 | ␊ |
| 23 | patchRoutine_t* patches = NULL;␊ |
| 24 | kernSymbols_t* kernelSymbols = NULL;␊ |
| 25 | static void register_kernel_patch(void* patch, int arch, int cpus);␊ |
| 26 | static void register_kernel_symbol(int kernelType, const char* name);␊ |
| 27 | static kernSymbols_t* lookup_kernel_symbol(const char* name);␊ |
| 28 | static int determineKernelArchitecture(void* kernelData);␊ |
| 29 | static int locate_symbols(void* kernelData);␊ |
| 30 | static unsigned int parse_mach_64(char *module, void* binary, long long(*symbol_handler)(char*, char*, long long, char));␊ |
| 31 | static unsigned int handle_symtable_64(char *module, UInt32 base, struct symtab_command* symtabCommand, long long(*symbol_handler)(char*, char*, long long, char), char is64);␊ |
| 32 | ␊ |
| 33 | /*␊ |
| 34 | * Internal patches provided by this module.␊ |
| 35 | */␊ |
| 36 | static void patch_cpuid_set_info_all(void* kernelData);␊ |
| 37 | static void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel);␊ |
| 38 | static void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel);␊ |
| 39 | ␊ |
| 40 | //static void patch_pmCPUExitHaltToOff(void* kernelData);␊ |
| 41 | static void patch_lapic_init(void* kernelData);␊ |
| 42 | static void patch_commpage_stuff_routine(void* kernelData);␊ |
| 43 | static void patch_lapic_configure(void* kernelData);␊ |
| 44 | //static void patch_lapic_interrupt(void* kernelData);␊ |
| 45 | ␊ |
| 46 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4, void* arg5, void* arg6);␊ |
| 47 | void kernel_patcher_ignore_cache(void* arg1, void* arg2, void* arg3, void *arg4, void* arg5, void* arg6);␊ |
| 48 | void kernel_patcher_ignore_cache(void* arg1, void* arg2, void* arg3, void *arg4, void* arg5, void* arg6){}␊ |
| 49 | ␊ |
| 50 | void KernelPatcher_start(void);␊ |
| 51 | void KernelPatcher_start(void)␊ |
| 52 | {␊ |
| 53 | ␉register_kernel_patch(patch_cpuid_set_info_all, KERNEL_ANY, CPUID_MODEL_UNKNOWN); ␊ |
| 54 | ␉␊ |
| 55 | ␉register_kernel_patch(patch_commpage_stuff_routine, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 56 | ␉␊ |
| 57 | ␉register_kernel_patch(patch_lapic_init, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 58 | ␉␊ |
| 59 | ␉// NOTE: following is currently 32bit only␊ |
| 60 | ␉register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊ |
| 61 | ␉␊ |
| 62 | ␉register_kernel_symbol(KERNEL_ANY, "_panic");␊ |
| 63 | ␉register_kernel_symbol(KERNEL_ANY, "_cpuid_set_info");␊ |
| 64 | ␉register_kernel_symbol(KERNEL_ANY, "_pmCPUExitHaltToOff");␊ |
| 65 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_init");␊ |
| 66 | ␉register_kernel_symbol(KERNEL_ANY, "_commpage_stuff_routine");␊ |
| 67 | ␉␊ |
| 68 | ␉// lapic_configure symbols␊ |
| 69 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_configure");␊ |
| 70 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_start");␊ |
| 71 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt_base");␊ |
| 72 | ␉␊ |
| 73 | ␉// lapic_interrup symbols␊ |
| 74 | ␉//register_kernel_patch(patch_lapic_interrupt, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 75 | ␉//register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt");␊ |
| 76 | ␉␊ |
| 77 | ␉// TODO: register needed symbols␊ |
| 78 | ␉␊ |
| 79 | ␉register_hook_callback("ExecKernel", &patch_kernel); ␊ |
| 80 | ␉␊ |
| 81 | ␉replace_system_function("_getKernelCachePath", &kernel_patcher_ignore_cache);␊ |
| 82 | }␊ |
| 83 | ␊ |
| 84 | /*␊ |
| 85 | * Register a kernel patch␊ |
| 86 | */␊ |
| 87 | static void register_kernel_patch(void* patch, int arch, int cpus)␊ |
| 88 | {␊ |
| 89 | ␉// TODO: only insert valid patches based on current cpuid and architecture␊ |
| 90 | ␉// AKA, don't at 64bit patches if it's a 32bit only machine␊ |
| 91 | ␉patchRoutine_t* entry;␊ |
| 92 | ␉␊ |
| 93 | ␉// Check to ensure that the patch is valid on this machine␊ |
| 94 | ␉// If it is not, exit early form this function␊ |
| 95 | ␉if(cpus != get_env(envModel))␊ |
| 96 | ␉{␊ |
| 97 | ␉␉if(cpus != CPUID_MODEL_ANY)␊ |
| 98 | ␉␉{␊ |
| 99 | ␉␉␉if(cpus == CPUID_MODEL_UNKNOWN)␊ |
| 100 | ␉␉␉{␊ |
| 101 | ␉␉␉␉switch(get_env(envModel))␊ |
| 102 | ␉␉␉␉{␊ |
| 103 | ␉␉␉␉␉case 13:␊ |
| 104 | ␉␉␉␉␉case CPUID_MODEL_YONAH:␊ |
| 105 | ␉␉␉␉␉case CPUID_MODEL_MEROM:␊ |
| 106 | ␉␉␉␉␉case CPUID_MODEL_PENRYN:␊ |
| 107 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM:␊ |
| 108 | ␉␉␉␉␉case CPUID_MODEL_FIELDS:␊ |
| 109 | ␉␉␉␉␉case CPUID_MODEL_DALES:␊ |
| 110 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM_EX:␊ |
| 111 | ␉␉␉␉␉␉// Known cpu's we don't want to add the patch␊ |
| 112 | ␉␉␉␉␉␉return;␊ |
| 113 | ␉␉␉␉␉␉break;␊ |
| 114 | ␉␉␉␉␉␉␊ |
| 115 | ␉␉␉␉␉default:␊ |
| 116 | ␉␉␉␉␉␉// CPU not in supported list, so we are going to add␊ |
| 117 | ␉␉␉␉␉␉// The patch will be applied␊ |
| 118 | ␉␉␉␉␉␉break;␊ |
| 119 | ␉␉␉␉}␊ |
| 120 | ␉␉␉}␊ |
| 121 | ␉␉␉else␊ |
| 122 | ␉␉␉{␊ |
| 123 | ␉␉␉␉// Invalid cpuid for current cpu. Ignoring patch␊ |
| 124 | ␉␉␉␉return;␊ |
| 125 | ␉␉␉}␊ |
| 126 | ␉␉}␊ |
| 127 | ␉}␊ |
| 128 | ␉␊ |
| 129 | ␉if(patches == NULL)␊ |
| 130 | ␉{␊ |
| 131 | ␉␉patches = entry = calloc(1,sizeof(patchRoutine_t));␊ |
| 132 | ␉␉␊ |
| 133 | ␉␉if (!entry || !patches) return;␊ |
| 134 | ␉␉␊ |
| 135 | ␉}␊ |
| 136 | ␉else␊ |
| 137 | ␉{␊ |
| 138 | ␉␉entry = patches;␊ |
| 139 | ␉␉while(entry->next)␊ |
| 140 | ␉␉{␊ |
| 141 | ␉␉␉entry = entry->next;␊ |
| 142 | ␉␉}␊ |
| 143 | ␉␉␊ |
| 144 | ␉␉entry->next = malloc(sizeof(patchRoutine_t));␊ |
| 145 | ␉␉␊ |
| 146 | ␉␉if (!entry->next) return;␊ |
| 147 | ␉␉if (!entry) ␊ |
| 148 | ␉␉{␊ |
| 149 | ␉␉␉free(entry->next);␊ |
| 150 | ␉␉␉return; ␊ |
| 151 | ␉␉}␊ |
| 152 | ␉␉␊ |
| 153 | ␉␉bzero(entry->next, sizeof(patchRoutine_t));␊ |
| 154 | ␉␉␊ |
| 155 | ␉␉entry = entry->next;␊ |
| 156 | ␉}␊ |
| 157 | ␉␊ |
| 158 | ␉entry->next = NULL;␊ |
| 159 | ␉entry->patchRoutine = patch;␊ |
| 160 | ␉entry->validArchs = arch;␊ |
| 161 | ␉entry->validCpu = cpus;␊ |
| 162 | }␊ |
| 163 | ␊ |
| 164 | static void register_kernel_symbol(int kernelType, const char* name)␊ |
| 165 | {␊ |
| 166 | ␉if(kernelSymbols == NULL)␊ |
| 167 | ␉{␊ |
| 168 | ␉␉kernelSymbols = malloc(sizeof(kernSymbols_t));␊ |
| 169 | ␉␉if (!kernelSymbols) return;␊ |
| 170 | ␉␉bzero(kernelSymbols,sizeof(kernSymbols_t));␊ |
| 171 | ␉␉kernelSymbols->next = NULL;␊ |
| 172 | ␉␉kernelSymbols->symbol = (char*)name;␊ |
| 173 | ␉␉kernelSymbols->addr = 0;␊ |
| 174 | ␉}␊ |
| 175 | ␉else␊ |
| 176 | ␉{␊ |
| 177 | ␉␉kernSymbols_t *symbol = kernelSymbols;␊ |
| 178 | ␉␉while(symbol->next != NULL)␊ |
| 179 | ␉␉{␊ |
| 180 | ␉␉␉symbol = symbol->next;␊ |
| 181 | ␉␉}␊ |
| 182 | ␉␉␊ |
| 183 | ␉␉symbol->next = malloc(sizeof(kernSymbols_t));␊ |
| 184 | ␉␉if (!symbol->next) return;␊ |
| 185 | ␉␉bzero(symbol->next,sizeof(kernSymbols_t));␊ |
| 186 | ␉␉␊ |
| 187 | ␉␉symbol = symbol->next;␊ |
| 188 | ␉␉␊ |
| 189 | ␉␉symbol->next = NULL;␊ |
| 190 | ␉␉symbol->symbol = (char*)name;␊ |
| 191 | ␉␉symbol->addr = 0;␊ |
| 192 | ␉}␊ |
| 193 | }␊ |
| 194 | ␊ |
| 195 | static kernSymbols_t* lookup_kernel_symbol(const char* name)␊ |
| 196 | {␊ |
| 197 | ␉kernSymbols_t *symbol = kernelSymbols;␊ |
| 198 | ␉␊ |
| 199 | ␉while(symbol && strcmp(symbol->symbol, name) !=0)␊ |
| 200 | ␉{␊ |
| 201 | ␉␉symbol = symbol->next;␊ |
| 202 | ␉}␊ |
| 203 | ␉␊ |
| 204 | ␉if(!symbol)␊ |
| 205 | ␉{␊ |
| 206 | ␉␉return NULL;␊ |
| 207 | ␉}␊ |
| 208 | ␉else␊ |
| 209 | ␉{␊ |
| 210 | ␉␉return symbol;␊ |
| 211 | ␉}␊ |
| 212 | }␊ |
| 213 | ␊ |
| 214 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4, void* arg5, void* arg6)␊ |
| 215 | {␊ |
| 216 | ␉patchRoutine_t* entry = patches;␊ |
| 217 | ␉␊ |
| 218 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
| 219 | ␉␊ |
| 220 | ␉locate_symbols(kernelData);␊ |
| 221 | ␉␊ |
| 222 | ␉if(patches != NULL)␊ |
| 223 | ␉{␊ |
| 224 | ␉␉while(entry)␊ |
| 225 | ␉␉{␊ |
| 226 | ␉␉␉if(entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
| 227 | ␉␉␉{␊ |
| 228 | ␉␉␉␉if(entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
| 229 | ␉␉␉}␊ |
| 230 | ␉␉␉entry = entry->next;␊ |
| 231 | ␉␉}␊ |
| 232 | ␉}␊ |
| 233 | }␊ |
| 234 | ␊ |
| 235 | static int determineKernelArchitecture(void* kernelData)␊ |
| 236 | {␉␊ |
| 237 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
| 238 | ␉{␊ |
| 239 | ␉␉return KERNEL_32;␊ |
| 240 | ␉}␊ |
| 241 | ␉␊ |
| 242 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
| 243 | ␉{␊ |
| 244 | ␉␉return KERNEL_64;␊ |
| 245 | ␉}␊ |
| 246 | ␉else␊ |
| 247 | ␉{␊ |
| 248 | ␉␉return KERNEL_ERR;␊ |
| 249 | ␉}␊ |
| 250 | }␊ |
| 251 | ␊ |
| 252 | static unsigned int parse_mach_64(char *module, void* binary, long long(*symbol_handler)(char*, char*, long long, char))␉// TODO: add param to specify valid archs␊ |
| 253 | {␉␊ |
| 254 | ␉char is64 = false;␊ |
| 255 | ␉unsigned int module_start = 0xFFFFFFFF;␊ |
| 256 | ␉EFI_STATUS bind_status = EFI_SUCCESS;␊ |
| 257 | ␊ |
| 258 | ␉// TODO convert all of the structs to a union␉␊ |
| 259 | ␉struct dyld_info_command* dyldInfoCommand = NULL;␉␊ |
| 260 | ␉struct symtab_command* symtabCommand = NULL;␉␊ |
| 261 | ␉␊ |
| 262 | ␉{␊ |
| 263 | ␉␉struct segment_command *segCommand = NULL;␊ |
| 264 | ␉␉struct segment_command_64 *segCommand64 = NULL;␊ |
| 265 | ␉␉struct load_command *loadCommand = NULL;␊ |
| 266 | ␉␉UInt32 binaryIndex = 0;␊ |
| 267 | ␉␉UInt16 cmd = 0;␊ |
| 268 | ␉␉␊ |
| 269 | ␉␉// Parse through the load commands␊ |
| 270 | ␉␉if(((struct mach_header*)binary)->magic == MH_MAGIC)␊ |
| 271 | ␉␉{␊ |
| 272 | ␉␉␉is64 = false;␊ |
| 273 | ␉␉␉binaryIndex += sizeof(struct mach_header);␊ |
| 274 | ␉␉}␊ |
| 275 | ␉␉else if(((struct mach_header_64*)binary)->magic == MH_MAGIC_64)␊ |
| 276 | ␉␉{␊ |
| 277 | ␉␉␉// NOTE: modules cannot be 64bit...␊ |
| 278 | ␉␉␉is64 = true;␊ |
| 279 | ␉␉␉binaryIndex += sizeof(struct mach_header_64);␊ |
| 280 | ␉␉}␊ |
| 281 | ␉␉else␊ |
| 282 | ␉␉{␊ |
| 283 | ␉␉␉printf("Modules: Invalid mach magic\n");␊ |
| 284 | ␉␉␉getc();␊ |
| 285 | ␉␉␉return 0xFFFFFFFF;␊ |
| 286 | ␉␉}␊ |
| 287 | ␉␉␊ |
| 288 | ␉␉␊ |
| 289 | ␉␉␊ |
| 290 | ␉␉/*if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊ |
| 291 | ␉␉ {␊ |
| 292 | ␉␉ printf("Module is not a dylib. Unable to load.\n");␊ |
| 293 | ␉␉ getc();␊ |
| 294 | ␉␉ return NULL; // Module is in the incorrect format␊ |
| 295 | ␉␉ }*/␊ |
| 296 | ␉␉␊ |
| 297 | ␉␉while(cmd < ((struct mach_header*)binary)->ncmds)␊ |
| 298 | ␉␉{␊ |
| 299 | ␉␉␉cmd++;␊ |
| 300 | ␉␉␉␊ |
| 301 | ␉␉␉loadCommand = binary + binaryIndex;␊ |
| 302 | ␉␉␉UInt32 cmdSize = loadCommand->cmdsize;␊ |
| 303 | ␉␉␉␊ |
| 304 | ␉␉␉␊ |
| 305 | ␉␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊ |
| 306 | ␉␉␉{␊ |
| 307 | ␉␉␉␉case LC_SYMTAB:␊ |
| 308 | ␉␉␉␉␉symtabCommand = binary + binaryIndex;␊ |
| 309 | ␉␉␉␉␉break;␊ |
| 310 | ␉␉␉␉␉␊ |
| 311 | ␉␉␉␉case LC_SEGMENT: // 32bit macho␊ |
| 312 | ␉␉␉␉{␊ |
| 313 | ␉␉␉␉␉segCommand = binary + binaryIndex;␊ |
| 314 | ␉␉␉␉␉␊ |
| 315 | ␉␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
| 316 | ␉␉␉␉␉␊ |
| 317 | ␉␉␉␉␉if(strncmp("__TEXT", segCommand->segname, sizeof("__TEXT")) == 0)␊ |
| 318 | ␉␉␉␉␉{␊ |
| 319 | ␉␉␉␉␉␉UInt32 sectionIndex;␊ |
| 320 | ␉␉␉␉␉␉␊ |
| 321 | #if DEBUG_KERNEL_PATCHER␊ |
| 322 | ␉␉␉␉␉␉unsigned long fileaddr;␊ |
| 323 | ␉␉␉␉␉␉long filesize;␉␉␉␉␉␊ |
| 324 | ␉␉␉␉␉␉vmaddr = (segCommand->vmaddr & 0x3fffffff);␊ |
| 325 | ␉␉␉␉␉␉vmsize = segCommand->vmsize;␉ ␊ |
| 326 | ␉␉␉␉␉␉fileaddr = ((unsigned long)(binary + binaryIndex) + segCommand->fileoff);␊ |
| 327 | ␉␉␉␉␉␉filesize = segCommand->filesize;␊ |
| 328 | ␉␉␉␉␉␉␊ |
| 329 | ␉␉␉␉␉␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
| 330 | ␉␉␉␉␉␉␉ segCommand->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊ |
| 331 | ␉␉␉␉␉␉␉ (unsigned) segCommand->nsects, (unsigned)segCommand->flags);␊ |
| 332 | #if DEBUG_KERNEL_PATCHER==2␊ |
| 333 | ␉␉␉␉␉␉␊ |
| 334 | ␉␉␉␉␉␉getc();␊ |
| 335 | #endif␊ |
| 336 | #endif␊ |
| 337 | ␉␉␉␉␉␉␊ |
| 338 | ␉␉␉␉␉␉sectionIndex = sizeof(struct segment_command);␊ |
| 339 | ␉␉␉␉␉␉␊ |
| 340 | ␉␉␉␉␉␉struct section *sect;␊ |
| 341 | ␉␉␉␉␉␉␊ |
| 342 | ␉␉␉␉␉␉while(sectionIndex < segCommand->cmdsize)␊ |
| 343 | ␉␉␉␉␉␉{␊ |
| 344 | ␉␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
| 345 | ␉␉␉␉␉␉␉␊ |
| 346 | ␉␉␉␉␉␉␉sectionIndex += sizeof(struct section);␊ |
| 347 | ␉␉␉␉␉␉␉␊ |
| 348 | ␉␉␉␉␉␉␉␊ |
| 349 | ␉␉␉␉␉␉␉if(strncmp("__text", sect->sectname,sizeof("__text")) == 0)␊ |
| 350 | ␉␉␉␉␉␉␉{␊ |
| 351 | ␉␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
| 352 | ␉␉␉␉␉␉␉␉textSection = sect->offset;␊ |
| 353 | ␉␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
| 354 | ␉␉␉␉␉␉␉␉break;␊ |
| 355 | ␉␉␉␉␉␉␉}␉␉␉␉␉␊ |
| 356 | ␉␉␉␉␉␉}␊ |
| 357 | ␉␉␉␉␉}␊ |
| 358 | ␉␉␉␉␉break;␊ |
| 359 | ␉␉␉␉}␉␊ |
| 360 | ␉␉␉␉case LC_SEGMENT_64:␉// 64bit macho's␊ |
| 361 | ␉␉␉␉{␊ |
| 362 | ␉␉␉␉␉segCommand64 = binary + binaryIndex;␊ |
| 363 | ␉␉␉␉␉␊ |
| 364 | ␉␉␉␉␉//printf("Segment name is %s\n", segCommand->segname);␊ |
| 365 | ␉␉␉␉␉␊ |
| 366 | ␉␉␉␉␉if(strncmp("__TEXT", segCommand64->segname, sizeof("__TEXT")) == 0)␊ |
| 367 | ␉␉␉␉␉{␊ |
| 368 | ␉␉␉␉␉␉UInt32 sectionIndex;␊ |
| 369 | ␉␉␉␉␉␉␊ |
| 370 | #if DEBUG_KERNEL_PATCHER␉␉␉␉␉␉␊ |
| 371 | ␉␉␉␉␉␉unsigned long fileaddr;␊ |
| 372 | ␉␉␉␉␉␉long filesize;␉␉␉␉␉␊ |
| 373 | ␉␉␉␉␉␉vmaddr = (segCommand64->vmaddr & 0x3fffffff);␊ |
| 374 | ␉␉␉␉␉␉vmsize = segCommand64->vmsize;␉ ␊ |
| 375 | ␉␉␉␉␉␉fileaddr = ((unsigned long)(binary + binaryIndex) + segCommand64->fileoff);␊ |
| 376 | ␉␉␉␉␉␉filesize = segCommand64->filesize;␊ |
| 377 | ␉␉␉␉␉␉␊ |
| 378 | ␉␉␉␉␉␉printf("segname: %s, vmaddr: %x, vmsize: %x, fileoff: %x, filesize: %x, nsects: %d, flags: %x.\n",␊ |
| 379 | ␉␉␉␉␉␉␉ segCommand64->segname, (unsigned)vmaddr, (unsigned)vmsize, (unsigned)fileaddr, (unsigned)filesize,␊ |
| 380 | ␉␉␉␉␉␉␉ (unsigned) segCommand64->nsects, (unsigned)segCommand64->flags);␊ |
| 381 | #if DEBUG_KERNEL_PATCHER==2␊ |
| 382 | ␉␉␉␉␉␉␊ |
| 383 | ␉␉␉␉␉␉getc();␊ |
| 384 | #endif␊ |
| 385 | #endif␊ |
| 386 | ␉␉␉␉␉␉␊ |
| 387 | ␉␉␉␉␉␉sectionIndex = sizeof(struct segment_command_64);␊ |
| 388 | ␉␉␉␉␉␉␊ |
| 389 | ␉␉␉␉␉␉struct section_64 *sect;␊ |
| 390 | ␉␉␉␉␉␉␊ |
| 391 | ␉␉␉␉␉␉while(sectionIndex < segCommand64->cmdsize)␊ |
| 392 | ␉␉␉␉␉␉{␊ |
| 393 | ␉␉␉␉␉␉␉sect = binary + binaryIndex + sectionIndex;␊ |
| 394 | ␉␉␉␉␉␉␉␊ |
| 395 | ␉␉␉␉␉␉␉sectionIndex += sizeof(struct section_64);␊ |
| 396 | ␉␉␉␉␉␉␉␊ |
| 397 | ␉␉␉␉␉␉␉␊ |
| 398 | ␉␉␉␉␉␉␉if(strncmp("__text", sect->sectname, sizeof("__text")) == 0)␊ |
| 399 | ␉␉␉␉␉␉␉{␊ |
| 400 | ␉␉␉␉␉␉␉␉// __TEXT,__text found, save the offset and address for when looking for the calls.␊ |
| 401 | ␉␉␉␉␉␉␉␉textSection = sect->offset;␊ |
| 402 | ␉␉␉␉␉␉␉␉textAddress = sect->addr;␊ |
| 403 | ␉␉␉␉␉␉␉␉␊ |
| 404 | ␉␉␉␉␉␉␉␉break;␊ |
| 405 | ␉␉␉␉␉␉␉}␉␉␉␉␉␊ |
| 406 | ␉␉␉␉␉␉}␊ |
| 407 | ␉␉␉␉␉}␊ |
| 408 | ␉␉␉␉␉␊ |
| 409 | ␉␉␉␉␉break;␊ |
| 410 | ␉␉␉␉}␊ |
| 411 | ␉␉␉␉case LC_DYSYMTAB:␊ |
| 412 | ␉␉␉␉␉break;␊ |
| 413 | ␉␉␉␉␉␊ |
| 414 | ␉␉␉␉case LC_LOAD_DYLIB:␊ |
| 415 | ␉␉␉␉case LC_LOAD_WEAK_DYLIB ^ LC_REQ_DYLD:␊ |
| 416 | break;␊ |
| 417 | ␊ |
| 418 | ␉␉␉␉case LC_ID_DYLIB:␊ |
| 419 | break;␊ |
| 420 | ␊ |
| 421 | ␉␉␉␉␉␊ |
| 422 | ␉␉␉␉case LC_DYLD_INFO:␊ |
| 423 | ␉␉␉␉␉// Bind and rebase info is stored here␊ |
| 424 | ␉␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊ |
| 425 | ␉␉␉␉␉break;␊ |
| 426 | ␉␉␉␉␉␊ |
| 427 | ␉␉␉␉case LC_UUID:␊ |
| 428 | ␉␉␉␉␉break;␊ |
| 429 | ␉␉␉␉␉␊ |
| 430 | ␉␉␉␉case LC_UNIXTHREAD:␊ |
| 431 | ␉␉␉␉␉break;␊ |
| 432 | ␉␉␉␉␉␊ |
| 433 | ␉␉␉␉default:␊ |
| 434 | ␉␉␉␉␉DBG("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊ |
| 435 | ␉␉␉␉␉break;␊ |
| 436 | ␉␉␉␉␉␊ |
| 437 | ␉␉␉}␊ |
| 438 | ␉␉␉␊ |
| 439 | ␉␉␉binaryIndex += cmdSize;␊ |
| 440 | ␉␉}␊ |
| 441 | ␉␉//if(!moduleName) return NULL;␊ |
| 442 | ␉}␉␉␊ |
| 443 | ␉␊ |
| 444 | ␉// bind_macho uses the symbols.␊ |
| 445 | ␉module_start = handle_symtable_64(module, (UInt32)binary, symtabCommand, symbol_handler, is64);␊ |
| 446 | ␉␊ |
| 447 | ␉// Rebase the module before binding it.␊ |
| 448 | ␉if(dyldInfoCommand && dyldInfoCommand->rebase_off)␊ |
| 449 | ␉{␊ |
| 450 | ␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off, dyldInfoCommand->rebase_size);␊ |
| 451 | ␉}␊ |
| 452 | ␉␊ |
| 453 | ␉if(dyldInfoCommand && dyldInfoCommand->bind_off)␊ |
| 454 | ␉{␊ |
| 455 | ␉␉bind_status = bind_macho(module, binary, (char*)dyldInfoCommand->bind_off, dyldInfoCommand->bind_size);␊ |
| 456 | ␉}␊ |
| 457 | ␉␊ |
| 458 | ␉if(dyldInfoCommand && dyldInfoCommand->weak_bind_off && (bind_status == EFI_SUCCESS))␊ |
| 459 | ␉{␊ |
| 460 | ␉␉// NOTE: this currently should never happen.␊ |
| 461 | ␉␉bind_status = bind_macho(module, binary, (char*)dyldInfoCommand->weak_bind_off, dyldInfoCommand->weak_bind_size);␊ |
| 462 | ␉}␊ |
| 463 | ␉␊ |
| 464 | ␉if(dyldInfoCommand && dyldInfoCommand->lazy_bind_off && (bind_status == EFI_SUCCESS))␊ |
| 465 | ␉{␊ |
| 466 | ␉␉// NOTE: we are binding the lazy pointers as a module is laoded,␊ |
| 467 | ␉␉// This should be changed to bind when a symbol is referened at runtime instead.␊ |
| 468 | ␉␉bind_status = bind_macho(module, binary, (char*)dyldInfoCommand->lazy_bind_off, dyldInfoCommand->lazy_bind_size);␊ |
| 469 | ␉}␊ |
| 470 | ␉␊ |
| 471 | if (bind_status != EFI_SUCCESS) {␊ |
| 472 | module_start = 0xFFFFFFFF;␊ |
| 473 | }␊ |
| 474 | ␊ |
| 475 | ␉return module_start;␊ |
| 476 | ␉␊ |
| 477 | }␊ |
| 478 | ␊ |
| 479 | static unsigned int handle_symtable_64(char *module, UInt32 base, struct symtab_command* symtabCommand, long long(*symbol_handler)(char*, char*, long long, char), char is64)␊ |
| 480 | {␉␉␊ |
| 481 | ␉unsigned int module_start = 0xFFFFFFFF;␊ |
| 482 | ␉␊ |
| 483 | ␉UInt32 symbolIndex = 0;␊ |
| 484 | if (!symtabCommand) {␊ |
| 485 | return 0xFFFFFFFF;␊ |
| 486 | }␊ |
| 487 | ␉char* symbolString = base + (char*)symtabCommand->stroff;␊ |
| 488 | ␉if(!is64)␊ |
| 489 | ␉{␊ |
| 490 | ␉␉struct nlist* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
| 491 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
| 492 | ␉␉{␉␉␉␉␉␉␊ |
| 493 | ␉␉␉if(symbolEntry->n_value)␊ |
| 494 | ␉␉␉{␉␉␉␉␊ |
| 495 | ␉␉␉␉if(strstr(symbolString + symbolEntry->n_un.n_strx, "module_start") || (strncmp(symbolString + symbolEntry->n_un.n_strx, "start", sizeof("start")) == 0))␊ |
| 496 | ␉␉␉␉{␊ |
| 497 | ␉␉␉␉␉module_start = base + symbolEntry->n_value;␊ |
| 498 | ␉␉␉␉␉DBG("n_value %x module_start %x\n", (unsigned)symbolEntry->n_value, (unsigned)module_start);␊ |
| 499 | ␉␉␉␉}␊ |
| 500 | ␉␉␉␉else␊ |
| 501 | ␉␉␉␉{␊ |
| 502 | ␉␉␉␉␉symbol_handler(module, symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64);␊ |
| 503 | ␉␉␉␉␉␊ |
| 504 | ␉␉␉␉␉␊ |
| 505 | ␉␉␉␉}␊ |
| 506 | #if DEBUG_KERNEL_PATCHER␊ |
| 507 | ␉␉␉␉bool isTexT = (((unsigned)symbolEntry->n_value > (unsigned)vmaddr) && ((unsigned)(vmaddr + vmsize) > (unsigned)symbolEntry->n_value ));␊ |
| 508 | ␉␉␉␉printf("%s %s\n", isTexT ? "__TEXT :" : "__DATA(OR ANY) :", symbolString + symbolEntry->n_un.n_strx);␊ |
| 509 | #if DEBUG_KERNEL_PATCHER==2␉␊ |
| 510 | ␉␉␉␉␊ |
| 511 | ␉␉␉␉if(strcmp(symbolString + symbolEntry->n_un.n_strx, "_BootHelp_txt") == 0)␊ |
| 512 | ␉␉␉␉{␊ |
| 513 | ␉␉␉␉␉long long addr = (long long)base + symbolEntry->n_value;␊ |
| 514 | ␉␉␉␉␉unsigned char *BootHelp = NULL;␊ |
| 515 | ␉␉␉␉␉BootHelp = (unsigned char*)(UInt32)addr;␉␉␉␉␉␊ |
| 516 | ␉␉␉␉␉printf("method 1: __DATA : BootHelp_txt[0] %x\n", BootHelp[0]);␊ |
| 517 | ␉␉␉␉␉␊ |
| 518 | ␉␉␉␉␉long long addr2 = symbolEntry->n_value;␊ |
| 519 | ␉␉␉␉␉unsigned char *BootHelp2 = NULL;␊ |
| 520 | ␉␉␉␉␉BootHelp2 = (unsigned char*)(UInt32)addr2;␉␉␉␉␉␊ |
| 521 | ␉␉␉␉␉printf("method 2: __DATA : BootHelp_txt[0] %x\n", BootHelp2[0]);␊ |
| 522 | ␉␉␉␉}␊ |
| 523 | #endif␊ |
| 524 | #endif␊ |
| 525 | ␉␉␉␉␊ |
| 526 | ␉␉␉}␊ |
| 527 | ␉␉␉␊ |
| 528 | ␉␉␉symbolEntry++;␊ |
| 529 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
| 530 | ␉␉}␊ |
| 531 | ␉}␊ |
| 532 | ␉else␊ |
| 533 | ␉{␊ |
| 534 | ␉␉struct nlist_64* symbolEntry = (void*)base + symtabCommand->symoff;␊ |
| 535 | ␉␉// NOTE First entry is *not* correct, but we can ignore it (i'm getting radar:// right now)␉␊ |
| 536 | ␉␉while(symbolIndex < symtabCommand->nsyms)␊ |
| 537 | ␉␉{␉␊ |
| 538 | ␉␉␉␊ |
| 539 | ␉␉␉if(strstr(symbolString + symbolEntry->n_un.n_strx, "module_start") || (strncmp(symbolString + symbolEntry->n_un.n_strx, "start",sizeof("start")) == 0))␊ |
| 540 | ␉␉␉{␊ |
| 541 | ␉␉␉␉module_start = (unsigned int)(base + symbolEntry->n_value);␊ |
| 542 | ␉␉␉}␊ |
| 543 | ␉␉␉else␊ |
| 544 | ␉␉␉{␊ |
| 545 | ␉␉␉␉symbol_handler(module, symbolString + symbolEntry->n_un.n_strx, (long long)base + symbolEntry->n_value, is64);␊ |
| 546 | ␉␉␉}␊ |
| 547 | ␉␉␉␊ |
| 548 | ␉␉␉symbolEntry++;␊ |
| 549 | ␉␉␉symbolIndex++;␉// TODO remove␊ |
| 550 | ␉␉}␊ |
| 551 | ␉}␉␊ |
| 552 | ␉return module_start;␊ |
| 553 | ␉␊ |
| 554 | }␊ |
| 555 | ␊ |
| 556 | /**␊ |
| 557 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
| 558 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
| 559 | **/␊ |
| 560 | static int locate_symbols(void* kernelData)␊ |
| 561 | {␊ |
| 562 | ␉char is64 = 1;␊ |
| 563 | ␉parse_mach_64("VirtualXnuSyms",kernelData, symbol_handler);␊ |
| 564 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
| 565 | ␉return 1 << is64;␊ |
| 566 | }␊ |
| 567 | ␊ |
| 568 | long long symbol_handler(char* module, char* symbolName, long long addr, char is64)␊ |
| 569 | {␊ |
| 570 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
| 571 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
| 572 | ␉␊ |
| 573 | ␉if(symbol)␊ |
| 574 | ␉{␊ |
| 575 | ␉␉symbol->addr = addr;␊ |
| 576 | ␉}␊ |
| 577 | ␉␊ |
| 578 | ␉return 0xFFFFFFFF; // fixme␊ |
| 579 | }␊ |
| 580 | ␊ |
| 581 | /**␊ |
| 582 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
| 583 | ** Or replace it so that the cpuid is set to a valid value.␊ |
| 584 | **/␊ |
| 585 | static void patch_cpuid_set_info_all(void* kernelData)␊ |
| 586 | {␊ |
| 587 | ␉switch(get_env(envModel))␊ |
| 588 | ␉{␊ |
| 589 | ␉␉case CPUID_MODEL_ATOM:␊ |
| 590 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
| 591 | ␉␉␉{␊ |
| 592 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN);␊ |
| 593 | ␉␉␉}␊ |
| 594 | ␉␉␉else ␊ |
| 595 | ␉␉␉{␊ |
| 596 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN);␊ |
| 597 | ␉␉␉}␊ |
| 598 | ␉␉␉␊ |
| 599 | ␉␉␉break;␊ |
| 600 | ␉␉␉␊ |
| 601 | ␉␉default:␊ |
| 602 | ␉␉{␊ |
| 603 | ␉␉␉// AnV: Extra cpuid fix for spoofing Nehalem CPU for i5/i9␊ |
| 604 | ␉␉␉switch(get_env(envFamily))␊ |
| 605 | ␉␉␉{␊ |
| 606 | ␉␉␉␉case 0x1E: /* Intel i5 */␊ |
| 607 | ␉␉␉␉case 0x2C: /* Intel i9 */␊ |
| 608 | ␉␉␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
| 609 | ␉␉␉␉␉{␊ |
| 610 | ␉␉␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_NEHALEM, CPUID_MODEL_NEHALEM);␊ |
| 611 | ␉␉␉␉␉}␊ |
| 612 | ␉␉␉␉␉else ␊ |
| 613 | ␉␉␉␉␉{␊ |
| 614 | ␉␉␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_NEHALEM, CPUID_MODEL_NEHALEM);␊ |
| 615 | ␉␉␉␉␉}␊ |
| 616 | ␉␉␉␉␉␊ |
| 617 | ␉␉␉␉␉break;␊ |
| 618 | ␉␉␉␉␉␊ |
| 619 | ␉␉␉␉default:␊ |
| 620 | ␉␉␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
| 621 | ␉␉␉␉␉{␊ |
| 622 | ␉␉␉␉␉␉patch_cpuid_set_info_32(kernelData, 0, 0);␊ |
| 623 | ␉␉␉␉␉}␊ |
| 624 | ␉␉␉␉␉else␊ |
| 625 | ␉␉␉␉␉{␊ |
| 626 | ␉␉␉␉␉␉patch_cpuid_set_info_64(kernelData, 0, 0);␊ |
| 627 | ␉␉␉␉␉}␉␉␉␉␉␊ |
| 628 | ␉␉␉␉␉break;␊ |
| 629 | ␉␉␉}␊ |
| 630 | ␉␉␉break;␉␉␉␊ |
| 631 | ␉␉}␊ |
| 632 | ␉}␊ |
| 633 | }␊ |
| 634 | ␊ |
| 635 | static void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
| 636 | {␊ |
| 637 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 638 | ␉␊ |
| 639 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
| 640 | ␉␊ |
| 641 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
| 642 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 643 | ␉␊ |
| 644 | ␉//UInt32 jumpLocation = 0;␊ |
| 645 | ␉␊ |
| 646 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 647 | ␉{␊ |
| 648 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
| 649 | ␉␉return;␊ |
| 650 | ␉}␊ |
| 651 | ␉␊ |
| 652 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 653 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
| 654 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 655 | ␉{␊ |
| 656 | ␉␉printf("Unable to locate _panic\n");␊ |
| 657 | ␉␉return;␊ |
| 658 | ␉}␊ |
| 659 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 660 | ␉␊ |
| 661 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
| 662 | ␉while( ␊ |
| 663 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 664 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 665 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 666 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 667 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 668 | ␉␉ )␊ |
| 669 | ␉{␊ |
| 670 | ␉␉patchLocation++;␊ |
| 671 | ␉}␊ |
| 672 | ␉patchLocation--;␊ |
| 673 | ␉␊ |
| 674 | ␉// Remove panic just in ca se␊ |
| 675 | ␉// The panic instruction is exactly 5 bytes long.␊ |
| 676 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 677 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 678 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 679 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 680 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 681 | ␉␊ |
| 682 | ␉// Check for a 10.2.0+ kernel␊ |
| 683 | ␉if(bytes[patchLocation - 19] == 0xC7 && bytes[patchLocation - 18] == 0x05)␊ |
| 684 | ␉{␊ |
| 685 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 17] << 0 |␊ |
| 686 | ␉␉bytes[patchLocation - 16] << 8 |␊ |
| 687 | ␉␉bytes[patchLocation - 15] << 16 |␊ |
| 688 | ␉␉bytes[patchLocation - 14] << 24;␊ |
| 689 | ␉␉␊ |
| 690 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
| 691 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 310; ␊ |
| 692 | ␉␉␊ |
| 693 | ␉␉//ffffff8000228b3b -> 0x00490e8b␊ |
| 694 | ␉␉//ffffff8000228c28 -> -237 -> 0x490D9E -> -310␊ |
| 695 | ␉␉␊ |
| 696 | ␉␉// The mov is 10 bytes␊ |
| 697 | ␉␉/*␊ |
| 698 | ␉␉ bytes[patchLocation - 19] = 0x90;␉// c7␊ |
| 699 | ␉␉ bytes[patchLocation - 18] = 0x90;␉// 05␊ |
| 700 | ␉␉ bytes[patchLocation - 17] = 0x90;␉// family location␊ |
| 701 | ␉␉ bytes[patchLocation - 16] = 0x90;␉// family location␊ |
| 702 | ␉␉ bytes[patchLocation - 15] = 0x90;␉// family location␊ |
| 703 | ␉␉ bytes[patchLocation - 14] = 0x90;␉// family location␊ |
| 704 | ␉␉ */␊ |
| 705 | ␉␉bytes[patchLocation - 13] = (impersonateFamily & 0x000000FF) >> 0;␊ |
| 706 | ␉␉bytes[patchLocation - 12] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
| 707 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
| 708 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0xFF000000) >> 24;␊ |
| 709 | ␉␉␊ |
| 710 | ␉␉// The lea (%rip),%rip is 7 bytes␊ |
| 711 | ␉␉bytes[patchLocation - 9] = 0xC7;␊ |
| 712 | ␉␉bytes[patchLocation - 8] = 0x05;␊ |
| 713 | ␉␉bytes[patchLocation - 7] = ((cpuid_model_addr -10) & 0x000000FF) >> 0;␉// NOTE: this opcode is relative in 64bit mode, subtract offset␊ |
| 714 | ␉␉bytes[patchLocation - 6] = ((cpuid_model_addr -10) & 0x0000FF00) >> 8;␉␊ |
| 715 | ␉␉bytes[patchLocation - 5] = ((cpuid_model_addr -10) & 0x00FF0000) >> 16;␊ |
| 716 | ␉␉bytes[patchLocation - 4] = ((cpuid_model_addr -10) & 0xFF000000) >> 24;␊ |
| 717 | ␉␉bytes[patchLocation - 3] = impersonateModel;␉// cpuid_model␊ |
| 718 | ␉␉␊ |
| 719 | ␉␉// The xor eax eax is 2 bytes␊ |
| 720 | ␉␉bytes[patchLocation - 2] = 0x01;␉// cpuid_extmodel␊ |
| 721 | ␉␉bytes[patchLocation - 1] = 0x00;␉// cpuid_extfamily␊ |
| 722 | ␉␉␊ |
| 723 | ␉␉// The panic instruction is exactly 5 bytes long.␊ |
| 724 | ␉␉bytes[patchLocation - 0] = 0x02;␉// cpuid_stepping␊ |
| 725 | ␉␉/*bytes[patchLocation + 1] = 0x90;␊ |
| 726 | ␉␉ bytes[patchLocation + 2] = 0x90;␊ |
| 727 | ␉␉ bytes[patchLocation + 3] = 0x90;␊ |
| 728 | ␉␉ bytes[patchLocation + 4] = 0x90;␊ |
| 729 | ␉␉ */␊ |
| 730 | ␉␉␊ |
| 731 | ␉␉// Panic call has been removed.␊ |
| 732 | ␉␉// Override the CPUID now. This requires ~ 10 bytes on 10.0.0 kernels␊ |
| 733 | ␉␉// On 10.2.0+ kernels, this requires ~16 bytes␊ |
| 734 | ␉␉␊ |
| 735 | ␉␉// Total: 24 bytes␊ |
| 736 | ␉␉printf("Running on a 10.2.0+ kernel\n");␊ |
| 737 | ␉␉getc();␊ |
| 738 | ␉}␊ |
| 739 | ␉else {␊ |
| 740 | ␉␉printf("Running on a 10.0.0 kernel, patch unsupported\n");␊ |
| 741 | ␉␉getc();␊ |
| 742 | ␉}␊ |
| 743 | }␊ |
| 744 | ␊ |
| 745 | static void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
| 746 | {␉␊ |
| 747 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 748 | ␉␊ |
| 749 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
| 750 | ␉␊ |
| 751 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
| 752 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 753 | ␉␊ |
| 754 | ␉UInt32 jumpLocation = 0;␉␊ |
| 755 | ␉␊ |
| 756 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 757 | ␉{␊ |
| 758 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
| 759 | ␉␉return;␊ |
| 760 | ␉}␊ |
| 761 | ␉␊ |
| 762 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 763 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
| 764 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 765 | ␉{␊ |
| 766 | ␉␉printf("Unable to locate _panic\n");␊ |
| 767 | ␉␉return;␊ |
| 768 | ␉}␊ |
| 769 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 770 | ␉␊ |
| 771 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
| 772 | ␉while( ␊ |
| 773 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 774 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 775 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 776 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 777 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 778 | ␉␉ )␊ |
| 779 | ␉{␊ |
| 780 | ␉␉patchLocation++;␊ |
| 781 | ␉}␊ |
| 782 | ␉patchLocation--;␊ |
| 783 | ␉␊ |
| 784 | ␉// Remove panic call, just in case the following patch routines fail␊ |
| 785 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 786 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 787 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 788 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 789 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 790 | ␉␊ |
| 791 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
| 792 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
| 793 | ␉jumpLocation = patchLocation - 15;␊ |
| 794 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
| 795 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -8)) &&␊ |
| 796 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
| 797 | ␉{␊ |
| 798 | ␉␉jumpLocation--;␊ |
| 799 | ␉}␊ |
| 800 | ␉␊ |
| 801 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
| 802 | ␉if(impersonateFamily &&␊ |
| 803 | ␉ impersonateModel &&␊ |
| 804 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
| 805 | ␉{␊ |
| 806 | ␉␉␊ |
| 807 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
| 808 | ␉␉␊ |
| 809 | ␉␉/* ␊ |
| 810 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
| 811 | ␉␉ */␊ |
| 812 | ␉␉␊ |
| 813 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
| 814 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
| 815 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
| 816 | ␉␉bytes[patchLocation - 14] << 8 |␊ |
| 817 | ␉␉bytes[patchLocation - 13] << 16 |␊ |
| 818 | ␉␉bytes[patchLocation - 12] << 24;␊ |
| 819 | ␉␉␊ |
| 820 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
| 821 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 299; ␊ |
| 822 | ␉␉␊ |
| 823 | ␉␉// cpufamily␊ |
| 824 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
| 825 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
| 826 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
| 827 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
| 828 | ␉␉␊ |
| 829 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
| 830 | ␉␉// nop and continue with the rest of the patch␊ |
| 831 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
| 832 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
| 833 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
| 834 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
| 835 | ␉␉␊ |
| 836 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
| 837 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
| 838 | ␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
| 839 | ␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
| 840 | ␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
| 841 | ␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
| 842 | ␉␉␊ |
| 843 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
| 844 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
| 845 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
| 846 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
| 847 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
| 848 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
| 849 | ␉}␊ |
| 850 | ␉else if(impersonateFamily && impersonateModel)␊ |
| 851 | ␉{␊ |
| 852 | ␉␉// pre 10.6.2 kernel␊ |
| 853 | ␉␉// Locate the jump to directly *after* the panic call,␊ |
| 854 | ␉␉jumpLocation = patchLocation - 4;␊ |
| 855 | ␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
| 856 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
| 857 | ␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
| 858 | ␉␉{␊ |
| 859 | ␉␉␉jumpLocation--;␊ |
| 860 | ␉␉}␊ |
| 861 | ␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
| 862 | ␉␉// I'll just leave it to verify the binary stucture.␊ |
| 863 | ␉␉␊ |
| 864 | ␉␉// NOTE: the cpumodel_familt data is not set in _cpuid_set_info␊ |
| 865 | ␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
| 866 | ␉␉// we set now.␊ |
| 867 | ␉␉␊ |
| 868 | ␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
| 869 | ␉␉{␊ |
| 870 | ␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
| 871 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
| 872 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
| 873 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
| 874 | ␉␉␉// Remove jump␊ |
| 875 | ␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
| 876 | ␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
| 877 | ␉␉␉␊ |
| 878 | ␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
| 879 | ␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
| 880 | ␉␉␉␊ |
| 881 | ␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
| 882 | ␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
| 883 | ␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
| 884 | ␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
| 885 | ␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
| 886 | ␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
| 887 | ␉␉␉␊ |
| 888 | ␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
| 889 | ␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
| 890 | ␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
| 891 | ␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
| 892 | ␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
| 893 | ␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
| 894 | ␉␉␉␊ |
| 895 | #if 0␊ |
| 896 | ␉␉␉patchLocation = jumpLocation;␊ |
| 897 | #endif␊ |
| 898 | ␉␉␉// We now have 14 bytes available for a patch␊ |
| 899 | ␉␉}␊ |
| 900 | ␉␉else ␊ |
| 901 | ␉␉{␊ |
| 902 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
| 903 | ␉␉}␊ |
| 904 | ␉}␊ |
| 905 | ␉else ␊ |
| 906 | ␉{␊ |
| 907 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
| 908 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
| 909 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
| 910 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
| 911 | ␉}␊ |
| 912 | }␊ |
| 913 | ␊ |
| 914 | /**␊ |
| 915 | ** SleepEnabler.kext replacement (for those that need it)␊ |
| 916 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
| 917 | **/␊ |
| 918 | #if 0␊ |
| 919 | static void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
| 920 | {␊ |
| 921 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 922 | ␉␊ |
| 923 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
| 924 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
| 925 | ␉␊ |
| 926 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 927 | ␉{␊ |
| 928 | ␉␉printf("Unable to locate _pmCPUExitHaltToOff\n");␊ |
| 929 | ␉␉return;␊ |
| 930 | ␉}␊ |
| 931 | ␉␊ |
| 932 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 933 | ␉␊ |
| 934 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
| 935 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
| 936 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
| 937 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
| 938 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
| 939 | ␉␉␊ |
| 940 | ␉{␊ |
| 941 | ␉␉patchLocation++;␊ |
| 942 | ␉}␊ |
| 943 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
| 944 | }␊ |
| 945 | #endif␊ |
| 946 | ␊ |
| 947 | static void patch_lapic_init(void* kernelData)␊ |
| 948 | {␊ |
| 949 | ␉UInt8 panicIndex = 0;␊ |
| 950 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 951 | ␉␊ |
| 952 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
| 953 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
| 954 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 955 | ␉{␊ |
| 956 | ␉␉printf("Unable to locate %s\n", "_lapic_init");␊ |
| 957 | ␉␉return;␊ |
| 958 | ␉}␊ |
| 959 | ␉␊ |
| 960 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 961 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
| 962 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 963 | ␉{␊ |
| 964 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
| 965 | ␉␉return;␊ |
| 966 | ␉}␊ |
| 967 | ␉␊ |
| 968 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 969 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
| 970 | ␉␊ |
| 971 | ␉// Locate the (panicIndex + 1) panic call␊ |
| 972 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
| 973 | ␉{␊ |
| 974 | ␉␉while( ␊ |
| 975 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 976 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 977 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 978 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 979 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 980 | ␉␉␉ )␊ |
| 981 | ␉␉{␊ |
| 982 | ␉␉␉patchLocation++;␊ |
| 983 | ␉␉}␊ |
| 984 | ␉␉patchLocation++;␊ |
| 985 | ␉␉panicIndex++;␊ |
| 986 | ␉}␊ |
| 987 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
| 988 | ␉␊ |
| 989 | ␉bytes[--patchLocation] = 0x90;␉␊ |
| 990 | ␉bytes[++patchLocation] = 0x90;␊ |
| 991 | ␉bytes[++patchLocation] = 0x90;␊ |
| 992 | ␉bytes[++patchLocation] = 0x90;␊ |
| 993 | ␉bytes[++patchLocation] = 0x90;␊ |
| 994 | }␊ |
| 995 | ␊ |
| 996 | static void patch_commpage_stuff_routine(void* kernelData)␊ |
| 997 | {␊ |
| 998 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 999 | ␉␊ |
| 1000 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
| 1001 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 1002 | ␉{␊ |
| 1003 | ␉␉//printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
| 1004 | ␉␉return;␊ |
| 1005 | ␉␉␊ |
| 1006 | ␉}␊ |
| 1007 | ␉␊ |
| 1008 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 1009 | ␉␊ |
| 1010 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 1011 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 1012 | ␉{␊ |
| 1013 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
| 1014 | ␉␉return;␊ |
| 1015 | ␉}␊ |
| 1016 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
| 1017 | ␉␊ |
| 1018 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 1019 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 1020 | ␉␊ |
| 1021 | ␉while( ␊ |
| 1022 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 1023 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 1024 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 1025 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 1026 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 1027 | ␉␉ )␊ |
| 1028 | ␉{␊ |
| 1029 | ␉␉patchLocation++;␊ |
| 1030 | ␉}␊ |
| 1031 | ␉patchLocation--;␊ |
| 1032 | ␉␊ |
| 1033 | ␉// Replace panic with nops␊ |
| 1034 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 1035 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 1036 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 1037 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 1038 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 1039 | }␊ |
| 1040 | #if 0␊ |
| 1041 | static void patch_lapic_interrupt(void* kernelData)␊ |
| 1042 | {␊ |
| 1043 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
| 1044 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 1045 | ␉␊ |
| 1046 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
| 1047 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 1048 | ␉{␊ |
| 1049 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt");␊ |
| 1050 | ␉␉return;␊ |
| 1051 | ␉}␊ |
| 1052 | ␉␊ |
| 1053 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 1054 | ␉␊ |
| 1055 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 1056 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 1057 | ␉{␊ |
| 1058 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
| 1059 | ␉␉return;␊ |
| 1060 | ␉}␊ |
| 1061 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
| 1062 | ␉␊ |
| 1063 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 1064 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 1065 | ␉␊ |
| 1066 | ␉while( ␊ |
| 1067 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 1068 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 1069 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 1070 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 1071 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 1072 | ␉␉ )␊ |
| 1073 | ␉{␊ |
| 1074 | ␉␉patchLocation++;␊ |
| 1075 | ␉}␊ |
| 1076 | ␉patchLocation--;␊ |
| 1077 | ␉␊ |
| 1078 | ␉// Replace panic with nops␊ |
| 1079 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 1080 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 1081 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 1082 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 1083 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 1084 | }␊ |
| 1085 | #endif␊ |
| 1086 | static void patch_lapic_configure(void* kernelData)␊ |
| 1087 | {␊ |
| 1088 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 1089 | ␉␊ |
| 1090 | ␉UInt32 patchLocation;␊ |
| 1091 | ␉UInt32 lapicStart;␊ |
| 1092 | ␉UInt32 lapicInterruptBase;␊ |
| 1093 | ␉␊ |
| 1094 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
| 1095 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 1096 | ␉{␊ |
| 1097 | ␉␉printf("Unable to locate %s\n", "_lapic_configure");␊ |
| 1098 | ␉␉return;␊ |
| 1099 | ␉}␊ |
| 1100 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 1101 | ␉␊ |
| 1102 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
| 1103 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 1104 | ␉{␊ |
| 1105 | ␉␉printf("Unable to locate %s\n", "_lapic_start");␊ |
| 1106 | ␉␉return;␊ |
| 1107 | ␉}␊ |
| 1108 | ␉lapicStart = symbol->addr; ␊ |
| 1109 | ␉␊ |
| 1110 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
| 1111 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 1112 | ␉{␊ |
| 1113 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
| 1114 | ␉␉return;␊ |
| 1115 | ␉}␊ |
| 1116 | ␉lapicInterruptBase = symbol->addr;␊ |
| 1117 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 1118 | ␉lapicStart -= (UInt32)kernelData;␊ |
| 1119 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
| 1120 | ␉␊ |
| 1121 | ␉// Looking for the following:␊ |
| 1122 | ␉//movl _lapic_start,%e_x␊ |
| 1123 | ␉//addl $0x00000320,%e_x␊ |
| 1124 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
| 1125 | ␉while( ␊ |
| 1126 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
| 1127 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
| 1128 | ␉␉ ( lapicStart != (UInt32)(␊ |
| 1129 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
| 1130 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
| 1131 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
| 1132 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
| 1133 | ␉␉␉␉␉␉␉␉␉ )␊ |
| 1134 | ␉␉␉␉␉␉␉␉␉)␊ |
| 1135 | ␉␉ ) || ␊ |
| 1136 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
| 1137 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
| 1138 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
| 1139 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
| 1140 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
| 1141 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
| 1142 | ␉␉ ␊ |
| 1143 | ␉␉ )␊ |
| 1144 | ␉{␊ |
| 1145 | ␉␉patchLocation++;␊ |
| 1146 | ␉}␊ |
| 1147 | ␉patchLocation-=2;␊ |
| 1148 | ␉␊ |
| 1149 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
| 1150 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
| 1151 | ␉␊ |
| 1152 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
| 1153 | ␉/*␊ |
| 1154 | ␉ bytes[patchLocation++] = 0x8B;␊ |
| 1155 | ␉ bytes[patchLocation++] = 0x15;␊ |
| 1156 | ␉ bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
| 1157 | ␉ bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
| 1158 | ␉ bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
| 1159 | ␉ bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
| 1160 | ␉ */␊ |
| 1161 | ␉patchLocation += 6;␊ |
| 1162 | ␉␊ |
| 1163 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
| 1164 | ␉/*␊ |
| 1165 | ␉ bytes[patchLocation++] = 0x81;␊ |
| 1166 | ␉ bytes[patchLocation++] = 0xC2;␊ |
| 1167 | ␉ */␊ |
| 1168 | ␉patchLocation += 2;␊ |
| 1169 | ␉bytes[patchLocation++] = 0x60;␊ |
| 1170 | ␉/*␊ |
| 1171 | ␉ bytes[patchLocation++];// = 0x03;␊ |
| 1172 | ␉ bytes[patchLocation++];// = 0x00;␊ |
| 1173 | ␉ bytes[patchLocation++];// = 0x00;␊ |
| 1174 | ␉ */␊ |
| 1175 | ␉patchLocation += 3;␊ |
| 1176 | ␉␊ |
| 1177 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
| 1178 | ␉bytes[patchLocation++] = 0xC7;␊ |
| 1179 | ␉bytes[patchLocation++] = 0x02;␊ |
| 1180 | ␉bytes[patchLocation++] = 0x00;␊ |
| 1181 | ␉bytes[patchLocation++] = 0x04;␊ |
| 1182 | ␉bytes[patchLocation++] = 0x00;␊ |
| 1183 | ␉bytes[patchLocation++] = 0x00;␊ |
| 1184 | ␉␊ |
| 1185 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
| 1186 | ␉bytes[patchLocation++] = 0x83;␊ |
| 1187 | ␉bytes[patchLocation++] = 0xEA;␊ |
| 1188 | ␉bytes[patchLocation++] = 0x40;␊ |
| 1189 | ␉␊ |
| 1190 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 1191 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 1192 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 1193 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 1194 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 1195 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 1196 | ␉␊ |
| 1197 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
| 1198 | ␉bytes[patchLocation++] = 0x83;␊ |
| 1199 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 1200 | ␉bytes[patchLocation++] = 0x0E;␊ |
| 1201 | ␉␊ |
| 1202 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 1203 | ␉bytes[patchLocation++] = 0x89;␊ |
| 1204 | ␉bytes[patchLocation++] = 0x02;␊ |
| 1205 | ␉␊ |
| 1206 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
| 1207 | ␉bytes[patchLocation++] = 0x81;␊ |
| 1208 | ␉bytes[patchLocation++] = 0xC2;␊ |
| 1209 | ␉bytes[patchLocation++] = 0x30;␊ |
| 1210 | ␉bytes[patchLocation++] = 0x03;␊ |
| 1211 | ␉bytes[patchLocation++] = 0x00;␊ |
| 1212 | ␉bytes[patchLocation++] = 0x00;␊ |
| 1213 | ␉␊ |
| 1214 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 1215 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 1216 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 1217 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 1218 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 1219 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 1220 | ␉␊ |
| 1221 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
| 1222 | ␉bytes[patchLocation++] = 0x83;␊ |
| 1223 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 1224 | ␉bytes[patchLocation++] = 0x0F;␊ |
| 1225 | ␉␊ |
| 1226 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 1227 | ␉bytes[patchLocation++] = 0x89;␊ |
| 1228 | ␉bytes[patchLocation++] = 0x02;␊ |
| 1229 | ␉␊ |
| 1230 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
| 1231 | ␉bytes[patchLocation++] = 0x83;␊ |
| 1232 | ␉bytes[patchLocation++] = 0xEA;␊ |
| 1233 | ␉bytes[patchLocation++] = 0x10;␊ |
| 1234 | ␉␊ |
| 1235 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 1236 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 1237 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 1238 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 1239 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 1240 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 1241 | ␉␊ |
| 1242 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
| 1243 | ␉bytes[patchLocation++] = 0x83;␊ |
| 1244 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 1245 | ␉bytes[patchLocation++] = 0x0C;␊ |
| 1246 | ␉␊ |
| 1247 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 1248 | ␉bytes[patchLocation++] = 0x89;␊ |
| 1249 | ␉bytes[patchLocation++] = 0x02;␊ |
| 1250 | ␉␊ |
| 1251 | ␉// Replace remaining with nops␊ |
| 1252 | ␉␊ |
| 1253 | ␉bytes[patchLocation++] = 0x90;␊ |
| 1254 | ␉bytes[patchLocation++] = 0x90;␊ |
| 1255 | ␉bytes[patchLocation++] = 0x90;␊ |
| 1256 | ␉bytes[patchLocation++] = 0x90;␊ |
| 1257 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
| 1258 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
| 1259 | }␊ |
| 1260 | |
