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 | extern PlatformInfo_t* Platform;␊ |
11 | ␊ |
12 | patchRoutine_t* patches = NULL;␊ |
13 | kernSymbols_t* kernelSymbols = NULL;␊ |
14 | ␊ |
15 | ␊ |
16 | void KernelPatcher_start()␊ |
17 | {␊ |
18 | ␉register_kernel_patch(patch_cpuid_set_info_all, KERNEL_ANY, CPUID_MODEL_UNKNOWN); ␊ |
19 | ␊ |
20 | ␉register_kernel_patch(patch_commpage_stuff_routine, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
21 | ␉␊ |
22 | ␉register_kernel_patch(patch_lapic_init, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
23 | ␊ |
24 | ␉// NOTE: following is currently 32bit only␊ |
25 | ␉register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊ |
26 | ␊ |
27 | ␉␊ |
28 | ␉register_kernel_symbol(KERNEL_ANY, "_panic");␊ |
29 | ␉register_kernel_symbol(KERNEL_ANY, "_cpuid_set_info");␊ |
30 | ␉register_kernel_symbol(KERNEL_ANY, "_pmCPUExitHaltToOff");␊ |
31 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_init");␊ |
32 | ␉register_kernel_symbol(KERNEL_ANY, "_commpage_stuff_routine");␊ |
33 | ␊ |
34 | ␉// lapic_configure symbols␊ |
35 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_configure");␊ |
36 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_start");␊ |
37 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt_base");␊ |
38 | ␉␊ |
39 | ␉// lapic_interrup symbols␊ |
40 | ␉//register_kernel_patch(patch_lapic_interrupt, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
41 | ␉//register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt");␊ |
42 | ␊ |
43 | ␊ |
44 | ␉␊ |
45 | ␉// TODO: register needed symbols␊ |
46 | ␉␊ |
47 | ␉␊ |
48 | ␉register_hook_callback("ExecKernel", &patch_kernel); ␊ |
49 | }␊ |
50 | ␊ |
51 | /*␊ |
52 | * Register a kerenl patch␊ |
53 | */␊ |
54 | void register_kernel_patch(void* patch, int arch, int cpus)␊ |
55 | {␊ |
56 | ␉// TODO: only insert valid patches based on current cpuid and architecture␊ |
57 | ␉// AKA, don't at 64bit patches if it's a 32bit only machine␊ |
58 | ␉patchRoutine_t* entry;␊ |
59 | ␉␊ |
60 | ␉// TODO: verify Platform->CPU.Model is populated this early in bootup␊ |
61 | ␉// Check to ensure that the patch is valid on this machine␊ |
62 | ␉// If it is not, exit early form this function␊ |
63 | ␉if(cpus != Platform->CPU.Model)␊ |
64 | ␉{␊ |
65 | ␉␉if(cpus != CPUID_MODEL_ANY)␊ |
66 | ␉␉{␊ |
67 | ␉␉␉if(cpus == CPUID_MODEL_UNKNOWN)␊ |
68 | ␉␉␉{␊ |
69 | ␉␉␉␉switch(Platform->CPU.Model)␊ |
70 | ␉␉␉␉{␊ |
71 | ␉␉␉␉␉case 13:␊ |
72 | ␉␉␉␉␉case CPUID_MODEL_YONAH:␊ |
73 | ␉␉␉␉␉case CPUID_MODEL_MEROM:␊ |
74 | ␉␉␉␉␉case CPUID_MODEL_PENRYN:␊ |
75 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM:␊ |
76 | ␉␉␉␉␉case CPUID_MODEL_FIELDS:␊ |
77 | ␉␉␉␉␉case CPUID_MODEL_DALES:␊ |
78 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM_EX:␊ |
79 | ␉␉␉␉␉␉// Known cpu's we don't want to add the patch␊ |
80 | ␉␉␉␉␉␉return;␊ |
81 | ␉␉␉␉␉␉break;␊ |
82 | ␊ |
83 | ␉␉␉␉␉default:␊ |
84 | ␉␉␉␉␉␉// CPU not in supported list, so we are going to add␊ |
85 | ␉␉␉␉␉␉// The patch will be applied␊ |
86 | ␉␉␉␉␉␉break;␊ |
87 | ␉␉␉␉␉␉␊ |
88 | ␉␉␉␉}␊ |
89 | ␉␉␉}␊ |
90 | ␉␉␉else␊ |
91 | ␉␉␉{␊ |
92 | ␉␉␉␉// Invalid cpuid for current cpu. Ignoring patch␊ |
93 | ␉␉␉␉return;␊ |
94 | ␉␉␉}␊ |
95 | ␊ |
96 | ␉␉}␊ |
97 | ␉}␊ |
98 | ␉␉␊ |
99 | ␉if(patches == NULL)␊ |
100 | ␉{␊ |
101 | ␉␉patches = entry = malloc(sizeof(patchRoutine_t));␊ |
102 | ␉}␊ |
103 | ␉else␊ |
104 | ␉{␊ |
105 | ␉␉entry = patches;␊ |
106 | ␉␉while(entry->next)␊ |
107 | ␉␉{␊ |
108 | ␉␉␉entry = entry->next;␊ |
109 | ␉␉}␊ |
110 | ␉␉␊ |
111 | ␉␉entry->next = malloc(sizeof(patchRoutine_t));␊ |
112 | ␉␉entry = entry->next;␊ |
113 | ␉}␊ |
114 | ␉␊ |
115 | ␉entry->next = NULL;␊ |
116 | ␉entry->patchRoutine = patch;␊ |
117 | ␉entry->validArchs = arch;␊ |
118 | ␉entry->validCpu = cpus;␊ |
119 | }␊ |
120 | ␊ |
121 | void register_kernel_symbol(int kernelType, const char* name)␊ |
122 | {␊ |
123 | ␉if(kernelSymbols == NULL)␊ |
124 | ␉{␊ |
125 | ␉␉kernelSymbols = malloc(sizeof(kernSymbols_t));␊ |
126 | ␉␉kernelSymbols->next = NULL;␊ |
127 | ␉␉kernelSymbols->symbol = (char*)name;␊ |
128 | ␉␉kernelSymbols->addr = 0;␊ |
129 | ␉}␊ |
130 | ␉else {␊ |
131 | ␉␉kernSymbols_t *symbol = kernelSymbols;␊ |
132 | ␉␉while(symbol->next != NULL)␊ |
133 | ␉␉{␊ |
134 | ␉␉␉symbol = symbol->next;␊ |
135 | ␉␉}␊ |
136 | ␉␉␊ |
137 | ␉␉symbol->next = malloc(sizeof(kernSymbols_t));␊ |
138 | ␉␉symbol = symbol->next;␊ |
139 | ␊ |
140 | ␉␉symbol->next = NULL;␊ |
141 | ␉␉symbol->symbol = (char*)name;␊ |
142 | ␉␉symbol->addr = 0;␊ |
143 | ␉}␊ |
144 | }␊ |
145 | ␊ |
146 | kernSymbols_t* lookup_kernel_symbol(const char* name)␊ |
147 | {␊ |
148 | ␉kernSymbols_t *symbol = kernelSymbols;␊ |
149 | ␊ |
150 | ␉while(symbol && strcmp(symbol->symbol, name) !=0)␊ |
151 | ␉{␊ |
152 | ␉␉symbol = symbol->next;␊ |
153 | ␉}␊ |
154 | ␉␊ |
155 | ␉if(!symbol)␊ |
156 | ␉{␊ |
157 | ␉␉return NULL;␊ |
158 | ␉}␊ |
159 | ␉else␊ |
160 | ␉{␊ |
161 | ␉␉return symbol;␊ |
162 | ␉}␊ |
163 | ␊ |
164 | }␊ |
165 | ␊ |
166 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4, void* arg5, void* arg6)␊ |
167 | {␊ |
168 | ␉patchRoutine_t* entry = patches;␊ |
169 | ␊ |
170 | ␉␊ |
171 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
172 | ␊ |
173 | ␉locate_symbols(kernelData);␊ |
174 | ␉␊ |
175 | ␉if(patches != NULL)␊ |
176 | ␉{␊ |
177 | ␉␉while(entry)␊ |
178 | ␉␉{␊ |
179 | ␉␉␉if(entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
180 | ␉␉␉{␊ |
181 | ␉␉␉␉if(entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
182 | ␉␉␉}␊ |
183 | ␉␉␉entry = entry->next;␊ |
184 | ␉␉}␊ |
185 | ␉␉␊ |
186 | ␉}␊ |
187 | }␊ |
188 | ␊ |
189 | int determineKernelArchitecture(void* kernelData)␊ |
190 | {␉␊ |
191 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
192 | ␉{␊ |
193 | ␉␉return KERNEL_32;␊ |
194 | ␉}␊ |
195 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
196 | ␉{␊ |
197 | ␉␉return KERNEL_64;␊ |
198 | ␉}␊ |
199 | ␉else␊ |
200 | ␉{␊ |
201 | ␉␉return KERNEL_ERR;␊ |
202 | ␉}␊ |
203 | }␊ |
204 | ␊ |
205 | ␊ |
206 | /**␊ |
207 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
208 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
209 | **/␊ |
210 | int locate_symbols(void* kernelData)␊ |
211 | {␊ |
212 | ␉char is64 = 1;␊ |
213 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
214 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
215 | ␉return 1 << is64;␊ |
216 | }␊ |
217 | ␊ |
218 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
219 | {␊ |
220 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
221 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
222 | ␉␊ |
223 | ␉if(symbol)␊ |
224 | ␉{␊ |
225 | ␉␉symbol->addr = addr;␊ |
226 | ␉}␊ |
227 | ␉␊ |
228 | ␉return 0xFFFFFFFF; // fixme␊ |
229 | }␊ |
230 | ␊ |
231 | ␊ |
232 | /**␊ |
233 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
234 | ** Or replace it so that the cpuid is set to a valid value.␊ |
235 | **/␊ |
236 | void patch_cpuid_set_info_all(void* kernelData)␊ |
237 | {␊ |
238 | ␉switch(Platform->CPU.Model)␊ |
239 | ␉{␊ |
240 | ␉␉case CPUID_MODEL_ATOM:␊ |
241 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
242 | ␉␉␉{␊ |
243 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
244 | ␉␉␉}␊ |
245 | ␉␉␉else ␊ |
246 | ␉␉␉{␊ |
247 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
248 | ␊ |
249 | ␉␉␉}␊ |
250 | ␊ |
251 | ␉␉␉break;␊ |
252 | ␉␉␉␊ |
253 | ␉␉default:␊ |
254 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
255 | ␉␉␉{␊ |
256 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, 0, 0);␊ |
257 | ␉␉␉}␊ |
258 | ␉␉␉else␊ |
259 | ␉␉␉{␊ |
260 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, 0, 0);␊ |
261 | ␉␉␉}␊ |
262 | ␊ |
263 | ␉␉␉break;␊ |
264 | ␉}␊ |
265 | }␊ |
266 | void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
267 | {␊ |
268 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
269 | ␉␊ |
270 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
271 | ␉␊ |
272 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
273 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
274 | ␉␊ |
275 | ␉␊ |
276 | ␉␊ |
277 | ␉//UInt32 jumpLocation = 0;␊ |
278 | ␉␊ |
279 | ␉␊ |
280 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
281 | ␉{␊ |
282 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
283 | ␉␉return;␊ |
284 | ␉␉␊ |
285 | ␉}␊ |
286 | ␉␊ |
287 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
288 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
289 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
290 | ␉{␊ |
291 | ␉␉printf("Unable to locate _panic\n");␊ |
292 | ␉␉return;␊ |
293 | ␉}␊ |
294 | ␉panicAddr -= (UInt32)kernelData;␊ |
295 | ␉␊ |
296 | ␉␊ |
297 | ␉␊ |
298 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
299 | ␉while( ␊ |
300 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
301 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
302 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
303 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
304 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
305 | ␉␉ )␊ |
306 | ␉{␊ |
307 | ␉␉patchLocation++;␊ |
308 | ␉}␊ |
309 | ␉patchLocation--;␊ |
310 | ␉␊ |
311 | ␉// Remove panic just in ca se␊ |
312 | ␉// The panic instruction is exactly 5 bytes long.␊ |
313 | ␉bytes[patchLocation + 0] = 0x90;␊ |
314 | ␉bytes[patchLocation + 1] = 0x90;␊ |
315 | ␉bytes[patchLocation + 2] = 0x90;␊ |
316 | ␉bytes[patchLocation + 3] = 0x90;␊ |
317 | ␉bytes[patchLocation + 4] = 0x90;␊ |
318 | ␉␊ |
319 | ␉␊ |
320 | ␉␊ |
321 | ␉// Check for a 10.2.0+ kernel␊ |
322 | ␉if(bytes[patchLocation - 19] == 0xC7 && bytes[patchLocation - 18] == 0x05)␊ |
323 | ␉{␊ |
324 | ␉␉␊ |
325 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 17] << 0 |␊ |
326 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 16] << 8 |␊ |
327 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 15] << 16 |␊ |
328 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 24;␊ |
329 | ␉␉␊ |
330 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
331 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 310; ␊ |
332 | ␉␉␊ |
333 | ␉␉␊ |
334 | ␉␉//ffffff8000228b3b -> 0x00490e8b␊ |
335 | ␉␉//ffffff8000228c28 -> -237 -> 0x490D9E -> -310␊ |
336 | ␉␉␊ |
337 | ␉␉␊ |
338 | ␉␉// The mov is 10 bytes␊ |
339 | ␉␉/*␊ |
340 | ␉␉ bytes[patchLocation - 19] = 0x90;␉// c7␊ |
341 | ␉␉ bytes[patchLocation - 18] = 0x90;␉// 05␊ |
342 | ␉␉ bytes[patchLocation - 17] = 0x90;␉// family location␊ |
343 | ␉␉ bytes[patchLocation - 16] = 0x90;␉// family location␊ |
344 | ␉␉ bytes[patchLocation - 15] = 0x90;␉// family location␊ |
345 | ␉␉ bytes[patchLocation - 14] = 0x90;␉// family location␊ |
346 | ␉␉ */␊ |
347 | ␉␉bytes[patchLocation - 13] = (impersonateFamily & 0x000000FF) >> 0;␊ |
348 | ␉␉bytes[patchLocation - 12] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
349 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
350 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0xFF000000) >> 24;␊ |
351 | ␉␉␊ |
352 | ␉␉␊ |
353 | ␉␉// The lea (%rip),%rip is 7 bytes␊ |
354 | ␉␉bytes[patchLocation - 9] = 0xC7;␊ |
355 | ␉␉bytes[patchLocation - 8] = 0x05;␊ |
356 | ␉␉bytes[patchLocation - 7] = ((cpuid_model_addr -10) & 0x000000FF) >> 0;␉// NOTE: this opcode is relative in 64bit mode, subtract offset␊ |
357 | ␉␉bytes[patchLocation - 6] = ((cpuid_model_addr -10) & 0x0000FF00) >> 8;␉␊ |
358 | ␉␉bytes[patchLocation - 5] = ((cpuid_model_addr -10) & 0x00FF0000) >> 16;␊ |
359 | ␉␉bytes[patchLocation - 4] = ((cpuid_model_addr -10) & 0xFF000000) >> 24;␊ |
360 | ␉␉bytes[patchLocation - 3] = impersonateModel;␉// cpuid_model␊ |
361 | ␉␉␊ |
362 | ␉␉ ␊ |
363 | ␉␉ ␊ |
364 | ␉␉ // The xor eax eax is 2 bytes␊ |
365 | ␉␉bytes[patchLocation - 2] = 0x01;␉// cpuid_extmodel␊ |
366 | ␉␉bytes[patchLocation - 1] = 0x00;␉// cpuid_extfamily␊ |
367 | ␉␉␊ |
368 | ␉␉// The panic instruction is exactly 5 bytes long.␊ |
369 | ␉␉bytes[patchLocation - 0] = 0x02;␉// cpuid_stepping␊ |
370 | ␉␉/*bytes[patchLocation + 1] = 0x90;␊ |
371 | ␉␉bytes[patchLocation + 2] = 0x90;␊ |
372 | ␉␉bytes[patchLocation + 3] = 0x90;␊ |
373 | ␉␉bytes[patchLocation + 4] = 0x90;␊ |
374 | ␉␉*/␊ |
375 | ␉␉␊ |
376 | ␉␉// Panic call has been removed.␊ |
377 | ␉␉// Override the CPUID now. This requires ~ 10 bytes on 10.0.0 kernels␊ |
378 | ␉␉// On 10.2.0+ kernels, this requires ~16 bytes␊ |
379 | ␉␉␊ |
380 | ␉␉// Total: 24 bytes␊ |
381 | ␉␉printf("Running on a 10.2.0+ kernel\n");␊ |
382 | ␉␉getc();␊ |
383 | ␊ |
384 | ␉}␊ |
385 | ␉else {␊ |
386 | ␉␉printf("Running on a 10.0.0 kernel, patch unsupported\n");␊ |
387 | ␉␉getc();␊ |
388 | ␉}␊ |
389 | ␊ |
390 | ␉␊ |
391 | }␊ |
392 | ␊ |
393 | ␊ |
394 | ␊ |
395 | ␊ |
396 | ␊ |
397 | void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
398 | {␉␊ |
399 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
400 | ␉␊ |
401 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
402 | ␊ |
403 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
404 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
405 | ␉␊ |
406 | ␉␊ |
407 | ␊ |
408 | ␉UInt32 jumpLocation = 0;␊ |
409 | ␉␊ |
410 | ␉␊ |
411 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
412 | ␉{␊ |
413 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
414 | ␉␉return;␊ |
415 | ␉␉␊ |
416 | ␉}␊ |
417 | ␊ |
418 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
419 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
420 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
421 | ␉{␊ |
422 | ␉␉printf("Unable to locate _panic\n");␊ |
423 | ␉␉return;␊ |
424 | ␉}␊ |
425 | ␉panicAddr -= (UInt32)kernelData;␊ |
426 | ␊ |
427 | ␉␊ |
428 | ␉␊ |
429 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
430 | ␉while( ␊ |
431 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
432 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
433 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
434 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
435 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
436 | ␉␉ )␊ |
437 | ␉{␊ |
438 | ␉␉patchLocation++;␊ |
439 | ␉}␊ |
440 | ␉patchLocation--;␊ |
441 | ␉␊ |
442 | ␉// Remove panic call, just in case the following patch routines fail␊ |
443 | ␉bytes[patchLocation + 0] = 0x90;␊ |
444 | ␉bytes[patchLocation + 1] = 0x90;␊ |
445 | ␉bytes[patchLocation + 2] = 0x90;␊ |
446 | ␉bytes[patchLocation + 3] = 0x90;␊ |
447 | ␉bytes[patchLocation + 4] = 0x90;␊ |
448 | ␉␊ |
449 | ␉␊ |
450 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
451 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
452 | ␉jumpLocation = patchLocation - 15;␊ |
453 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
454 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -8)) &&␊ |
455 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
456 | ␉{␊ |
457 | ␉␉jumpLocation--;␊ |
458 | ␉}␊ |
459 | ␉␊ |
460 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
461 | ␉if(impersonateFamily &&␊ |
462 | ␉ impersonateModel &&␊ |
463 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
464 | ␉{␊ |
465 | ␉␉␊ |
466 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
467 | ␉␉␊ |
468 | ␉␉/* ␊ |
469 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
470 | ␉␉ */␊ |
471 | ␉␉␊ |
472 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
473 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
474 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
475 | ␉␉bytes[patchLocation - 14] << 8 |␊ |
476 | ␉␉bytes[patchLocation - 13] << 16 |␊ |
477 | ␉␉bytes[patchLocation - 12] << 24;␊ |
478 | ␉␉␊ |
479 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
480 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 299; ␊ |
481 | ␉␉␊ |
482 | ␉␉␊ |
483 | ␉␉// cpufamily␊ |
484 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
485 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
486 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
487 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
488 | ␉␉␊ |
489 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
490 | ␉␉// nop and continue with the rest of the patch␊ |
491 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
492 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
493 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
494 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
495 | ␉␉␊ |
496 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
497 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
498 | ␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
499 | ␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
500 | ␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
501 | ␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
502 | ␉␉␊ |
503 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
504 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
505 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
506 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
507 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
508 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
509 | ␉␉␊ |
510 | ␉}␊ |
511 | ␉else if(impersonateFamily && impersonateModel)␊ |
512 | ␉{␊ |
513 | ␉␉// pre 10.6.2 kernel␊ |
514 | ␉␉// Locate the jump to directly *after* the panic call,␊ |
515 | ␉␉jumpLocation = patchLocation - 4;␊ |
516 | ␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
517 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
518 | ␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
519 | ␉␉{␊ |
520 | ␉␉␉jumpLocation--;␊ |
521 | ␉␉}␊ |
522 | ␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
523 | ␉␉// I'll just leave it to verify the binary stucture.␊ |
524 | ␉␉␊ |
525 | ␉␉// NOTE: the cpumodel_familt data is not set in _cpuid_set_info␊ |
526 | ␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
527 | ␉␉// we set now.␊ |
528 | ␉␉␊ |
529 | ␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
530 | ␉␉{␊ |
531 | ␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
532 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
533 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
534 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
535 | ␉␉␉// Remove jump␊ |
536 | ␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
537 | ␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
538 | ␉␉␉␊ |
539 | ␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
540 | ␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
541 | ␉␉␉␊ |
542 | ␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
543 | ␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
544 | ␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
545 | ␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
546 | ␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
547 | ␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
548 | ␉␉␉␊ |
549 | ␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
550 | ␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
551 | ␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
552 | ␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
553 | ␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
554 | ␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
555 | ␉␉␉␊ |
556 | ␉␉␉␊ |
557 | ␉␉␉␊ |
558 | ␉␉␉patchLocation = jumpLocation;␊ |
559 | ␉␉␉// We now have 14 bytes available for a patch␊ |
560 | ␉␉␉␊ |
561 | ␉␉}␊ |
562 | ␉␉else ␊ |
563 | ␉␉{␊ |
564 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
565 | ␉␉}␊ |
566 | ␉}␊ |
567 | ␉else ␊ |
568 | ␉{␊ |
569 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
570 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
571 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
572 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
573 | ␉}␊ |
574 | }␊ |
575 | ␊ |
576 | ␊ |
577 | /**␊ |
578 | ** SleepEnabler.kext replacement (for those that need it)␊ |
579 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
580 | **/␊ |
581 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
582 | {␊ |
583 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
584 | ␊ |
585 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
586 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
587 | ␉␊ |
588 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
589 | ␉{␊ |
590 | ␉␉printf("Unable to locate _pmCPUExitHaltToOff\n");␊ |
591 | ␉␉return;␊ |
592 | ␉}␊ |
593 | ␉␊ |
594 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
595 | ␉␊ |
596 | ␉␊ |
597 | ␉␊ |
598 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
599 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
600 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
601 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
602 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
603 | ␊ |
604 | ␉{␊ |
605 | ␉␉patchLocation++;␊ |
606 | ␉}␊ |
607 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
608 | }␊ |
609 | ␊ |
610 | void patch_lapic_init(void* kernelData)␊ |
611 | {␊ |
612 | ␊ |
613 | ␉UInt8 panicIndex = 0;␊ |
614 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
615 | ␉␊ |
616 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
617 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
618 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
619 | ␉{␊ |
620 | ␉␉printf("Unable to locate %s\n", "_lapic_init");␊ |
621 | ␉␉return;␊ |
622 | ␉␉␊ |
623 | ␉}␊ |
624 | ␉␊ |
625 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
626 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
627 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
628 | ␉{␊ |
629 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
630 | ␉␉return;␊ |
631 | ␉}␊ |
632 | ␉␊ |
633 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
634 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
635 | ␊ |
636 | ␉␊ |
637 | ␉␊ |
638 | ␉␊ |
639 | ␉// Locate the (panicIndex + 1) panic call␊ |
640 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
641 | ␉{␊ |
642 | ␉␉while( ␊ |
643 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
644 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
645 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
646 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
647 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
648 | ␉␉␉ )␊ |
649 | ␉␉{␊ |
650 | ␉␉␉patchLocation++;␊ |
651 | ␉␉}␊ |
652 | ␉␉patchLocation++;␊ |
653 | ␉␉panicIndex++;␊ |
654 | ␉}␊ |
655 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
656 | ␉␊ |
657 | ␉bytes[--patchLocation] = 0x90;␉␊ |
658 | ␉bytes[++patchLocation] = 0x90;␊ |
659 | ␉bytes[++patchLocation] = 0x90;␊ |
660 | ␉bytes[++patchLocation] = 0x90;␊ |
661 | ␉bytes[++patchLocation] = 0x90;␊ |
662 | ␉␊ |
663 | ␉␊ |
664 | }␊ |
665 | ␊ |
666 | ␊ |
667 | void patch_commpage_stuff_routine(void* kernelData)␊ |
668 | {␊ |
669 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
670 | ␊ |
671 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
672 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
673 | ␉{␊ |
674 | ␉␉//printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
675 | ␉␉return;␊ |
676 | ␉␉␊ |
677 | ␉}␊ |
678 | ␉␊ |
679 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
680 | ␊ |
681 | ␉␊ |
682 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
683 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
684 | ␉{␊ |
685 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
686 | ␉␉return;␊ |
687 | ␉}␊ |
688 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
689 | ␊ |
690 | ␉patchLocation -= (UInt32)kernelData;␊ |
691 | ␉panicAddr -= (UInt32)kernelData;␊ |
692 | ␉␊ |
693 | ␉while( ␊ |
694 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
695 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
696 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
697 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
698 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
699 | ␉␉ )␊ |
700 | ␉{␊ |
701 | ␉␉patchLocation++;␊ |
702 | ␉}␊ |
703 | ␉patchLocation--;␊ |
704 | ␉␊ |
705 | ␉// Replace panic with nops␊ |
706 | ␉bytes[patchLocation + 0] = 0x90;␊ |
707 | ␉bytes[patchLocation + 1] = 0x90;␊ |
708 | ␉bytes[patchLocation + 2] = 0x90;␊ |
709 | ␉bytes[patchLocation + 3] = 0x90;␊ |
710 | ␉bytes[patchLocation + 4] = 0x90;␊ |
711 | ␉␊ |
712 | ␉␊ |
713 | }␊ |
714 | ␊ |
715 | void patch_lapic_interrupt(void* kernelData)␊ |
716 | {␊ |
717 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
718 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
719 | ␉␊ |
720 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
721 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
722 | ␉{␊ |
723 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt");␊ |
724 | ␉␉return;␊ |
725 | ␉␉␊ |
726 | ␉}␊ |
727 | ␉␊ |
728 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
729 | ␉␊ |
730 | ␉␊ |
731 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
732 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
733 | ␉{␊ |
734 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
735 | ␉␉return;␊ |
736 | ␉}␊ |
737 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
738 | ␉␊ |
739 | ␉patchLocation -= (UInt32)kernelData;␊ |
740 | ␉panicAddr -= (UInt32)kernelData;␊ |
741 | ␉␊ |
742 | ␉while( ␊ |
743 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
744 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
745 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
746 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
747 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
748 | ␉␉ )␊ |
749 | ␉{␊ |
750 | ␉␉patchLocation++;␊ |
751 | ␉}␊ |
752 | ␉patchLocation--;␊ |
753 | ␉␊ |
754 | ␉// Replace panic with nops␊ |
755 | ␉bytes[patchLocation + 0] = 0x90;␊ |
756 | ␉bytes[patchLocation + 1] = 0x90;␊ |
757 | ␉bytes[patchLocation + 2] = 0x90;␊ |
758 | ␉bytes[patchLocation + 3] = 0x90;␊ |
759 | ␉bytes[patchLocation + 4] = 0x90;␊ |
760 | ␉␊ |
761 | ␉␊ |
762 | }␊ |
763 | ␊ |
764 | ␊ |
765 | void patch_lapic_configure(void* kernelData)␊ |
766 | {␊ |
767 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
768 | ␉␊ |
769 | ␉UInt32 patchLocation;␊ |
770 | ␉UInt32 lapicStart;␊ |
771 | ␉UInt32 lapicInterruptBase;␊ |
772 | ␉␊ |
773 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
774 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
775 | ␉{␊ |
776 | ␉␉printf("Unable to locate %s\n", "_lapic_configure");␊ |
777 | ␉␉return;␊ |
778 | ␉}␊ |
779 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
780 | ␉␊ |
781 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
782 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
783 | ␉{␊ |
784 | ␉␉printf("Unable to locate %s\n", "_lapic_start");␊ |
785 | ␉␉return;␊ |
786 | ␉}␊ |
787 | ␉lapicStart = symbol->addr; ␊ |
788 | ␊ |
789 | ␊ |
790 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
791 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
792 | ␉{␊ |
793 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
794 | ␉␉return;␊ |
795 | ␉}␊ |
796 | ␉lapicInterruptBase = symbol->addr;␊ |
797 | ␉patchLocation -= (UInt32)kernelData;␊ |
798 | ␉lapicStart -= (UInt32)kernelData;␊ |
799 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
800 | ␉␊ |
801 | ␉␊ |
802 | ␉// Looking for the following:␊ |
803 | ␉//movl _lapic_start,%e_x␊ |
804 | ␉//addl $0x00000320,%e_x␊ |
805 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
806 | ␉while( ␊ |
807 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
808 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
809 | ␉␉ ( lapicStart != (UInt32)(␊ |
810 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
811 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
812 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
813 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
814 | ␉␉␉␉␉␉␉␉␉)␊ |
815 | ␉␉␉␉␉␉␉␉ )␊ |
816 | ␉␉ ) || ␊ |
817 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
818 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
819 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
820 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
821 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
822 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
823 | ␊ |
824 | ␉␉ )␊ |
825 | ␉{␊ |
826 | ␉␉patchLocation++;␊ |
827 | ␉}␊ |
828 | ␉patchLocation-=2;␊ |
829 | ␊ |
830 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
831 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
832 | ␉␊ |
833 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
834 | ␉/*␊ |
835 | ␉bytes[patchLocation++] = 0x8B;␊ |
836 | ␉bytes[patchLocation++] = 0x15;␊ |
837 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
838 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
839 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
840 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
841 | ␉*/␊ |
842 | ␉patchLocation += 6;␊ |
843 | ␉␊ |
844 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
845 | ␉/*␊ |
846 | ␉bytes[patchLocation++] = 0x81;␊ |
847 | ␉bytes[patchLocation++] = 0xC2;␊ |
848 | ␉*/␊ |
849 | ␉patchLocation += 2;␊ |
850 | ␉bytes[patchLocation++] = 0x60;␊ |
851 | ␉/*␊ |
852 | ␉bytes[patchLocation++];// = 0x03;␊ |
853 | ␉bytes[patchLocation++];// = 0x00;␊ |
854 | ␉bytes[patchLocation++];// = 0x00;␊ |
855 | ␉*/␊ |
856 | ␉ patchLocation += 3;␊ |
857 | ␊ |
858 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
859 | ␉bytes[patchLocation++] = 0xC7;␊ |
860 | ␉bytes[patchLocation++] = 0x02;␊ |
861 | ␉bytes[patchLocation++] = 0x00;␊ |
862 | ␉bytes[patchLocation++] = 0x04;␊ |
863 | ␉bytes[patchLocation++] = 0x00;␊ |
864 | ␉bytes[patchLocation++] = 0x00;␊ |
865 | ␉␊ |
866 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
867 | ␉bytes[patchLocation++] = 0x83;␊ |
868 | ␉bytes[patchLocation++] = 0xEA;␊ |
869 | ␉bytes[patchLocation++] = 0x40;␊ |
870 | ␊ |
871 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
872 | ␉bytes[patchLocation++] = 0xA1;␊ |
873 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
874 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
875 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
876 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
877 | ␊ |
878 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
879 | ␉bytes[patchLocation++] = 0x83;␊ |
880 | ␉bytes[patchLocation++] = 0xC0;␊ |
881 | ␉bytes[patchLocation++] = 0x0E;␊ |
882 | ␊ |
883 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
884 | ␉bytes[patchLocation++] = 0x89;␊ |
885 | ␉bytes[patchLocation++] = 0x02;␊ |
886 | ␉␊ |
887 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
888 | ␉bytes[patchLocation++] = 0x81;␊ |
889 | ␉bytes[patchLocation++] = 0xC2;␊ |
890 | ␉bytes[patchLocation++] = 0x30;␊ |
891 | ␉bytes[patchLocation++] = 0x03;␊ |
892 | ␉bytes[patchLocation++] = 0x00;␊ |
893 | ␉bytes[patchLocation++] = 0x00;␊ |
894 | ␉␊ |
895 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
896 | ␉bytes[patchLocation++] = 0xA1;␊ |
897 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
898 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
899 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
900 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
901 | ␉␊ |
902 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
903 | ␉bytes[patchLocation++] = 0x83;␊ |
904 | ␉bytes[patchLocation++] = 0xC0;␊ |
905 | ␉bytes[patchLocation++] = 0x0F;␊ |
906 | ␉␊ |
907 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
908 | ␉bytes[patchLocation++] = 0x89;␊ |
909 | ␉bytes[patchLocation++] = 0x02;␊ |
910 | ␉␊ |
911 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
912 | ␉bytes[patchLocation++] = 0x83;␊ |
913 | ␉bytes[patchLocation++] = 0xEA;␊ |
914 | ␉bytes[patchLocation++] = 0x10;␊ |
915 | ␊ |
916 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
917 | ␉bytes[patchLocation++] = 0xA1;␊ |
918 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
919 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
920 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
921 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
922 | ␉␊ |
923 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
924 | ␉bytes[patchLocation++] = 0x83;␊ |
925 | ␉bytes[patchLocation++] = 0xC0;␊ |
926 | ␉bytes[patchLocation++] = 0x0C;␊ |
927 | ␊ |
928 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
929 | ␉bytes[patchLocation++] = 0x89;␊ |
930 | ␉bytes[patchLocation++] = 0x02;␊ |
931 | ␊ |
932 | ␉// Replace remaining with nops␊ |
933 | ␊ |
934 | ␊ |
935 | ␉bytes[patchLocation++] = 0x90;␊ |
936 | ␉bytes[patchLocation++] = 0x90;␊ |
937 | ␉bytes[patchLocation++] = 0x90;␊ |
938 | ␉bytes[patchLocation++] = 0x90;␊ |
939 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
940 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
941 | }␊ |
942 | |