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)␊ |
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 | int determineKernelArchitecture(void* kernelData)␊ |
189 | {␉␊ |
190 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
191 | ␉{␊ |
192 | ␉␉return KERNEL_32;␊ |
193 | ␉}␊ |
194 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
195 | ␉{␊ |
196 | ␉␉return KERNEL_64;␊ |
197 | ␉}␊ |
198 | ␉else␊ |
199 | ␉{␊ |
200 | ␉␉return KERNEL_ERR;␊ |
201 | ␉}␊ |
202 | }␊ |
203 | ␊ |
204 | ␊ |
205 | /**␊ |
206 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
207 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
208 | **/␊ |
209 | int locate_symbols(void* kernelData)␊ |
210 | {␊ |
211 | ␉char is64 = 1;␊ |
212 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
213 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
214 | ␉return 1 << is64;␊ |
215 | }␊ |
216 | ␊ |
217 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
218 | {␊ |
219 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
220 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
221 | ␉␊ |
222 | ␉if(symbol)␊ |
223 | ␉{␊ |
224 | ␉␉symbol->addr = addr;␊ |
225 | ␉}␊ |
226 | ␉␊ |
227 | ␉return 0xFFFFFFFF; // fixme␊ |
228 | }␊ |
229 | ␊ |
230 | ␊ |
231 | /**␊ |
232 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
233 | ** Or replace it so that the cpuid is set to a valid value.␊ |
234 | **/␊ |
235 | void patch_cpuid_set_info_all(void* kernelData)␊ |
236 | {␊ |
237 | ␉switch(Platform->CPU.Model)␊ |
238 | ␉{␊ |
239 | ␉␉case CPUID_MODEL_ATOM:␊ |
240 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
241 | ␉␉␉{␊ |
242 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
243 | ␉␉␉}␊ |
244 | ␉␉␉else ␊ |
245 | ␉␉␉{␊ |
246 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
247 | ␊ |
248 | ␉␉␉}␊ |
249 | ␊ |
250 | ␉␉␉break;␊ |
251 | ␉␉␉␊ |
252 | ␉␉default:␊ |
253 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
254 | ␉␉␉{␊ |
255 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, 0, 0);␊ |
256 | ␉␉␉}␊ |
257 | ␉␉␉else␊ |
258 | ␉␉␉{␊ |
259 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, 0, 0);␊ |
260 | ␉␉␉}␊ |
261 | ␊ |
262 | ␉␉␉break;␊ |
263 | ␉}␊ |
264 | }␊ |
265 | void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
266 | {␊ |
267 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
268 | ␉␊ |
269 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
270 | ␉␊ |
271 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
272 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
273 | ␉␊ |
274 | ␉␊ |
275 | ␉␊ |
276 | ␉//UInt32 jumpLocation = 0;␊ |
277 | ␉␊ |
278 | ␉␊ |
279 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
280 | ␉{␊ |
281 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
282 | ␉␉return;␊ |
283 | ␉␉␊ |
284 | ␉}␊ |
285 | ␉␊ |
286 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
287 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
288 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
289 | ␉{␊ |
290 | ␉␉verbose("Unable to locate _panic\n");␊ |
291 | ␉␉return;␊ |
292 | ␉}␊ |
293 | ␉panicAddr -= (UInt32)kernelData;␊ |
294 | ␉␊ |
295 | ␉␊ |
296 | ␉␊ |
297 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
298 | ␉while( ␊ |
299 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
300 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
301 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
302 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
303 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
304 | ␉␉ )␊ |
305 | ␉{␊ |
306 | ␉␉patchLocation++;␊ |
307 | ␉}␊ |
308 | ␉patchLocation--;␊ |
309 | ␉␊ |
310 | ␉// Remove panic just in ca se␊ |
311 | ␉// The panic instruction is exactly 5 bytes long.␊ |
312 | ␉bytes[patchLocation + 0] = 0x90;␊ |
313 | ␉bytes[patchLocation + 1] = 0x90;␊ |
314 | ␉bytes[patchLocation + 2] = 0x90;␊ |
315 | ␉bytes[patchLocation + 3] = 0x90;␊ |
316 | ␉bytes[patchLocation + 4] = 0x90;␊ |
317 | ␉␊ |
318 | ␉␊ |
319 | ␉␊ |
320 | ␉// Check for a 10.2.0+ kernel␊ |
321 | ␉if(bytes[patchLocation - 19] == 0xC7 && bytes[patchLocation - 18] == 0x05)␊ |
322 | ␉{␊ |
323 | ␉␉␊ |
324 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 17] << 0 |␊ |
325 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 16] << 8 |␊ |
326 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 15] << 16 |␊ |
327 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 24;␊ |
328 | ␉␉␊ |
329 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
330 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 310; ␊ |
331 | ␉␉␊ |
332 | ␉␉␊ |
333 | ␉␉//ffffff8000228b3b -> 0x00490e8b␊ |
334 | ␉␉//ffffff8000228c28 -> -237 -> 0x490D9E -> -310␊ |
335 | ␉␉␊ |
336 | ␉␉␊ |
337 | ␉␉// The mov is 10 bytes␊ |
338 | ␉␉/*␊ |
339 | ␉␉ bytes[patchLocation - 19] = 0x90;␉// c7␊ |
340 | ␉␉ bytes[patchLocation - 18] = 0x90;␉// 05␊ |
341 | ␉␉ bytes[patchLocation - 17] = 0x90;␉// family location␊ |
342 | ␉␉ bytes[patchLocation - 16] = 0x90;␉// family location␊ |
343 | ␉␉ bytes[patchLocation - 15] = 0x90;␉// family location␊ |
344 | ␉␉ bytes[patchLocation - 14] = 0x90;␉// family location␊ |
345 | ␉␉ */␊ |
346 | ␉␉bytes[patchLocation - 13] = (impersonateFamily & 0x000000FF) >> 0;␊ |
347 | ␉␉bytes[patchLocation - 12] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
348 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
349 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0xFF000000) >> 24;␊ |
350 | ␉␉␊ |
351 | ␉␉␊ |
352 | ␉␉// The lea (%rip),%rip is 7 bytes␊ |
353 | ␉␉bytes[patchLocation - 9] = 0xC7;␊ |
354 | ␉␉bytes[patchLocation - 8] = 0x05;␊ |
355 | ␉␉bytes[patchLocation - 7] = ((cpuid_model_addr -10) & 0x000000FF) >> 0;␉// NOTE: this opcode is relative in 64bit mode, subtract offset␊ |
356 | ␉␉bytes[patchLocation - 6] = ((cpuid_model_addr -10) & 0x0000FF00) >> 8;␉␊ |
357 | ␉␉bytes[patchLocation - 5] = ((cpuid_model_addr -10) & 0x00FF0000) >> 16;␊ |
358 | ␉␉bytes[patchLocation - 4] = ((cpuid_model_addr -10) & 0xFF000000) >> 24;␊ |
359 | ␉␉bytes[patchLocation - 3] = impersonateModel;␉// cpuid_model␊ |
360 | ␉␉␊ |
361 | ␉␉ ␊ |
362 | ␉␉ ␊ |
363 | ␉␉ // The xor eax eax is 2 bytes␊ |
364 | ␉␉bytes[patchLocation - 2] = 0x01;␉// cpuid_extmodel␊ |
365 | ␉␉bytes[patchLocation - 1] = 0x00;␉// cpuid_extfamily␊ |
366 | ␉␉␊ |
367 | ␉␉// The panic instruction is exactly 5 bytes long.␊ |
368 | ␉␉bytes[patchLocation - 0] = 0x02;␉// cpuid_stepping␊ |
369 | ␉␉/*bytes[patchLocation + 1] = 0x90;␊ |
370 | ␉␉bytes[patchLocation + 2] = 0x90;␊ |
371 | ␉␉bytes[patchLocation + 3] = 0x90;␊ |
372 | ␉␉bytes[patchLocation + 4] = 0x90;␊ |
373 | ␉␉*/␊ |
374 | ␉␉␊ |
375 | ␉␉// Panic call has been removed.␊ |
376 | ␉␉// Override the CPUID now. This requires ~ 10 bytes on 10.0.0 kernels␊ |
377 | ␉␉// On 10.2.0+ kernels, this requires ~16 bytes␊ |
378 | ␉␉␊ |
379 | ␉␉// Total: 24 bytes␊ |
380 | ␉␉verbose("Running on a 10.2.0+ kernel\n");␊ |
381 | ␉␉getc();␊ |
382 | ␊ |
383 | ␉}␊ |
384 | ␉else {␊ |
385 | ␉␉verbose("Running on a 10.0.0 kernel, patch unsupported\n");␊ |
386 | ␉␉getc();␊ |
387 | ␉}␊ |
388 | ␊ |
389 | ␉␊ |
390 | }␊ |
391 | ␊ |
392 | ␊ |
393 | ␊ |
394 | ␊ |
395 | ␊ |
396 | void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
397 | {␊ |
398 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
399 | ␉␊ |
400 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
401 | ␊ |
402 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
403 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
404 | ␉UInt32 addrLocation = patchLocation;␊ |
405 | ␉␊ |
406 | ␊ |
407 | ␉UInt32 jumpLocation = 0;␊ |
408 | ␉␊ |
409 | ␉␊ |
410 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
411 | ␉{␊ |
412 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
413 | ␉␉return;␊ |
414 | ␉␉␊ |
415 | ␉}␊ |
416 | ␊ |
417 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
418 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
419 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
420 | ␉{␊ |
421 | ␉␉verbose("Unable to locate _panic\n");␊ |
422 | ␉␉return;␊ |
423 | ␉}␊ |
424 | ␉panicAddr -= (UInt32)kernelData;␊ |
425 | ␊ |
426 | ␉␊ |
427 | ␊ |
428 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
429 | ␉while( ␊ |
430 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
431 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
432 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
433 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
434 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
435 | ␉␉ )␊ |
436 | ␉{␊ |
437 | ␉␉patchLocation++;␊ |
438 | ␉}␊ |
439 | ␉patchLocation--;␊ |
440 | ␉␊ |
441 | ␉// Remove panic call, just in case the following patch routines fail␊ |
442 | ␉bytes[patchLocation + 0] = 0x90;␊ |
443 | ␉bytes[patchLocation + 1] = 0x90;␊ |
444 | ␉bytes[patchLocation + 2] = 0x90;␊ |
445 | ␉bytes[patchLocation + 3] = 0x90;␊ |
446 | ␉bytes[patchLocation + 4] = 0x90;␊ |
447 | ␉␊ |
448 | ␉␊ |
449 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
450 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
451 | ␉jumpLocation = patchLocation - 15;␊ |
452 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
453 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - 18)) &&␊ |
454 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
455 | ␉{␊ |
456 | ␉␉jumpLocation--;␊ |
457 | ␉}␊ |
458 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
459 | ␉if(impersonateFamily && impersonateModel &&␊ |
460 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
461 | ␉{␊ |
462 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
463 | ␉␉␊ |
464 | ␉␉/* ␊ |
465 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
466 | ␉␉ */␊ |
467 | ␉␉//␉␉␉␉␉␉␉␉␉cpuid_cpufamily_addr, impersonateFamily␉␉␉␉␉␉␉␉␉cpuid_model_addr␉ impersonateModel␊ |
468 | ␉␉//char new_bytes[] = {0xC7, 0x05, 0x__, 0x__, 0x__, 0x__, 0x__, 0x__, 0x__, 0x__, 0x90, 0x90, 0xC7, 0x05, 0x__, 0x__, 0x__, 0x__, 0x__, 0x01, 0x00, 0x02};␊ |
469 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
470 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
471 | ␉␉//UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
472 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 8 |␊ |
473 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 13] << 16 |␊ |
474 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 12] << 24;␊ |
475 | ␉␉␊ |
476 | ␉␉// NOTE: may change, determined based on cpuid_info struct: TODO: read from binary␊ |
477 | ␉␉//UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 295; ␊ |
478 | ␉␉␊ |
479 | ␉␉␊ |
480 | ␉␉// cpufamily␊ |
481 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
482 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
483 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
484 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
485 | ␉␉␊ |
486 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
487 | ␉␉// nop and continue with the rest of the patch␊ |
488 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
489 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
490 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
491 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
492 | ␉␉␊ |
493 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
494 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
495 | ␉␉␊ |
496 | ␉␉// Locate cpuid_addr_addr -> first four bytes after 8b 45 d8 25 f0 00 00 00 c1 e8 04 a2␊ |
497 | ␉␉while(bytes[addrLocation -12] != 0x8B ||␊ |
498 | ␉␉␉ bytes[addrLocation -11] != 0x45 ||␊ |
499 | ␉␉␉ bytes[addrLocation -10] != 0xD8 ||␊ |
500 | ␉␉␉ bytes[addrLocation -9] != 0x25 ||␊ |
501 | ␉␉␉ bytes[addrLocation -8] != 0xF0 ||␊ |
502 | ␉␉␉ bytes[addrLocation -7] != 0x00 ||␊ |
503 | ␉␉␉ bytes[addrLocation -6] != 0x00 ||␊ |
504 | ␉␉␉ bytes[addrLocation -5] != 0x00 ||␊ |
505 | ␉␉␉ bytes[addrLocation -4] != 0xC1 ||␊ |
506 | ␉␉␉ bytes[addrLocation -3] != 0xE8 ||␊ |
507 | ␉␉␉ bytes[addrLocation -2] != 0x04 ||␊ |
508 | ␉␉␉ bytes[addrLocation -1] != 0xA2)␊ |
509 | ␉␉{␊ |
510 | ␉␉␉// TODO: break if location is too large␊ |
511 | ␉␉␉addrLocation++;␊ |
512 | ␉␉}␉␉␊ |
513 | ␉␉␊ |
514 | ␉␉bytes[patchLocation - 3] = bytes[addrLocation];␊ |
515 | ␉␉bytes[patchLocation - 2] = bytes[addrLocation+1];␉␊ |
516 | ␉␉bytes[patchLocation - 1] = bytes[addrLocation+2];␊ |
517 | ␉␉bytes[patchLocation - 0] = bytes[addrLocation+3];␊ |
518 | ␉␉␊ |
519 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
520 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
521 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
522 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
523 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
524 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␉␉␊ |
525 | ␉}␊ |
526 | ␉else if(impersonateFamily && impersonateModel)␊ |
527 | ␉{␊ |
528 | ␊ |
529 | ␉␉// pre 10.6.2 kernel␊ |
530 | ␉␉// Locate the jump to directly *after* the panic call,␊ |
531 | ␉␉jumpLocation = patchLocation - 4;␊ |
532 | ␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
533 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
534 | ␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
535 | ␉␉{␊ |
536 | ␉␉␉jumpLocation--;␊ |
537 | ␉␉}␊ |
538 | ␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
539 | ␉␉// I'll just leave it to verify the binary stucture.␊ |
540 | ␉␉␊ |
541 | ␉␉// NOTE: the cpumodel_familt data is not set in _cpuid_set_info␊ |
542 | ␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
543 | ␉␉// we set now.␊ |
544 | ␉␉␊ |
545 | ␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
546 | ␉␉{␊ |
547 | ␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
548 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
549 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
550 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
551 | ␉␉␉// Remove jump␊ |
552 | ␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
553 | ␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
554 | ␉␉␉␊ |
555 | ␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
556 | ␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
557 | ␉␉␉␊ |
558 | ␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
559 | ␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
560 | ␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
561 | ␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
562 | ␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
563 | ␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
564 | ␉␉␉␊ |
565 | ␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
566 | ␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
567 | ␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
568 | ␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
569 | ␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
570 | ␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
571 | ␉␉␉␊ |
572 | ␉␉␉␊ |
573 | ␉␉␉␊ |
574 | ␉␉␉//patchLocation = jumpLocation;␊ |
575 | ␉␉␉// We now have 14 bytes available for a patch␊ |
576 | ␊ |
577 | ␉␉}␊ |
578 | ␉␉else ␊ |
579 | ␉␉{␊ |
580 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
581 | ␉␉}␊ |
582 | ␉}␊ |
583 | ␉else ␊ |
584 | ␉{␊ |
585 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
586 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
587 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
588 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
589 | ␉}␊ |
590 | }␊ |
591 | ␊ |
592 | ␊ |
593 | /**␊ |
594 | ** SleepEnabler.kext replacement (for those that need it)␊ |
595 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
596 | **/␊ |
597 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
598 | {␊ |
599 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
600 | ␊ |
601 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
602 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
603 | ␉␊ |
604 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
605 | ␉{␊ |
606 | ␉␉verbose("Unable to locate _pmCPUExitHaltToOff\n");␊ |
607 | ␉␉return;␊ |
608 | ␉}␊ |
609 | ␉␊ |
610 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
611 | ␉␊ |
612 | ␉␊ |
613 | ␉␊ |
614 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
615 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
616 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
617 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
618 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
619 | ␊ |
620 | ␉{␊ |
621 | ␉␉patchLocation++;␊ |
622 | ␉}␊ |
623 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
624 | }␊ |
625 | ␊ |
626 | void patch_lapic_init(void* kernelData)␊ |
627 | {␊ |
628 | ␉UInt8 panicIndex = 0;␊ |
629 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
630 | ␉␊ |
631 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
632 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
633 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
634 | ␉{␊ |
635 | ␉␉verbose("Unable to locate %s\n", "_lapic_init");␊ |
636 | ␉␉return;␊ |
637 | ␉␉␊ |
638 | ␉}␊ |
639 | ␉␊ |
640 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
641 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
642 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
643 | ␉{␊ |
644 | ␉␉verbose("Unable to locate %s\n", "_panic");␊ |
645 | ␉␉return;␊ |
646 | ␉}␊ |
647 | ␉␊ |
648 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
649 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
650 | ␊ |
651 | ␉␊ |
652 | ␉␊ |
653 | ␉␊ |
654 | ␉// Locate the (panicIndex + 1) panic call␊ |
655 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
656 | ␉{␊ |
657 | ␉␉while( ␊ |
658 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
659 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
660 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
661 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
662 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
663 | ␉␉␉ )␊ |
664 | ␉␉{␊ |
665 | ␉␉␉patchLocation++;␊ |
666 | ␉␉}␊ |
667 | ␉␉patchLocation++;␊ |
668 | ␉␉panicIndex++;␊ |
669 | ␉}␊ |
670 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
671 | ␉␊ |
672 | ␉bytes[--patchLocation] = 0x90;␉␊ |
673 | ␉bytes[++patchLocation] = 0x90;␊ |
674 | ␉bytes[++patchLocation] = 0x90;␊ |
675 | ␉bytes[++patchLocation] = 0x90;␊ |
676 | ␉bytes[++patchLocation] = 0x90;␊ |
677 | ␉␊ |
678 | ␉␊ |
679 | }␊ |
680 | ␊ |
681 | ␊ |
682 | void patch_commpage_stuff_routine(void* kernelData)␊ |
683 | {␊ |
684 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
685 | ␊ |
686 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
687 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
688 | ␉{␊ |
689 | ␉␉//printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
690 | ␉␉return;␊ |
691 | ␉␉␊ |
692 | ␉}␊ |
693 | ␉␊ |
694 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
695 | ␊ |
696 | ␉␊ |
697 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
698 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
699 | ␉{␊ |
700 | ␉␉verbose("Unable to locate %s\n", "_panic");␊ |
701 | ␉␉return;␊ |
702 | ␉}␊ |
703 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
704 | ␊ |
705 | ␉patchLocation -= (UInt32)kernelData;␊ |
706 | ␉panicAddr -= (UInt32)kernelData;␊ |
707 | ␉␊ |
708 | ␉while( ␊ |
709 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
710 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
711 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
712 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
713 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
714 | ␉␉ )␊ |
715 | ␉{␊ |
716 | ␉␉patchLocation++;␊ |
717 | ␉}␊ |
718 | ␉patchLocation--;␊ |
719 | ␉␊ |
720 | ␉// Replace panic with nops␊ |
721 | ␉bytes[patchLocation + 0] = 0x90;␊ |
722 | ␉bytes[patchLocation + 1] = 0x90;␊ |
723 | ␉bytes[patchLocation + 2] = 0x90;␊ |
724 | ␉bytes[patchLocation + 3] = 0x90;␊ |
725 | ␉bytes[patchLocation + 4] = 0x90;␊ |
726 | ␉␊ |
727 | ␉␊ |
728 | }␊ |
729 | ␊ |
730 | void patch_lapic_interrupt(void* kernelData)␊ |
731 | {␊ |
732 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
733 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
734 | ␉␊ |
735 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
736 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
737 | ␉{␊ |
738 | ␉␉verbose("Unable to locate %s\n", "_lapic_interrupt");␊ |
739 | ␉␉return;␊ |
740 | ␉␉␊ |
741 | ␉}␊ |
742 | ␉␊ |
743 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
744 | ␉␊ |
745 | ␉␊ |
746 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
747 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
748 | ␉{␊ |
749 | ␉␉verbose("Unable to locate %s\n", "_panic");␊ |
750 | ␉␉return;␊ |
751 | ␉}␊ |
752 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
753 | ␉␊ |
754 | ␉patchLocation -= (UInt32)kernelData;␊ |
755 | ␉panicAddr -= (UInt32)kernelData;␊ |
756 | ␉␊ |
757 | ␉while( ␊ |
758 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
759 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
760 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
761 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
762 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
763 | ␉␉ )␊ |
764 | ␉{␊ |
765 | ␉␉patchLocation++;␊ |
766 | ␉}␊ |
767 | ␉patchLocation--;␊ |
768 | ␉␊ |
769 | ␉// Replace panic with nops␊ |
770 | ␉bytes[patchLocation + 0] = 0x90;␊ |
771 | ␉bytes[patchLocation + 1] = 0x90;␊ |
772 | ␉bytes[patchLocation + 2] = 0x90;␊ |
773 | ␉bytes[patchLocation + 3] = 0x90;␊ |
774 | ␉bytes[patchLocation + 4] = 0x90;␊ |
775 | ␉␊ |
776 | ␉␊ |
777 | }␊ |
778 | ␊ |
779 | ␊ |
780 | void patch_lapic_configure(void* kernelData)␊ |
781 | {␊ |
782 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
783 | ␉␊ |
784 | ␉UInt32 patchLocation;␊ |
785 | ␉UInt32 lapicStart;␊ |
786 | ␉UInt32 lapicInterruptBase;␊ |
787 | ␉␊ |
788 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
789 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
790 | ␉{␊ |
791 | ␉␉verbose("Unable to locate %s\n", "_lapic_configure");␊ |
792 | ␉␉return;␊ |
793 | ␉}␊ |
794 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
795 | ␉␊ |
796 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
797 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
798 | ␉{␊ |
799 | ␉␉verbose("Unable to locate %s\n", "_lapic_start");␊ |
800 | ␉␉return;␊ |
801 | ␉}␊ |
802 | ␉lapicStart = symbol->addr; ␊ |
803 | ␊ |
804 | ␊ |
805 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
806 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
807 | ␉{␊ |
808 | ␉␉verbose("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
809 | ␉␉return;␊ |
810 | ␉}␊ |
811 | ␉lapicInterruptBase = symbol->addr;␊ |
812 | ␉patchLocation -= (UInt32)kernelData;␊ |
813 | ␉lapicStart -= (UInt32)kernelData;␊ |
814 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
815 | ␉␊ |
816 | ␉␊ |
817 | ␉// Looking for the following:␊ |
818 | ␉//movl _lapic_start,%e_x␊ |
819 | ␉//addl $0x00000320,%e_x␊ |
820 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
821 | ␉while( ␊ |
822 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
823 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
824 | ␉␉ ( lapicStart != (UInt32)(␊ |
825 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
826 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
827 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
828 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
829 | ␉␉␉␉␉␉␉␉␉)␊ |
830 | ␉␉␉␉␉␉␉␉ )␊ |
831 | ␉␉ ) || ␊ |
832 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
833 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
834 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
835 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
836 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
837 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
838 | ␊ |
839 | ␉␉ )␊ |
840 | ␉{␊ |
841 | ␉␉patchLocation++;␊ |
842 | ␉}␊ |
843 | ␉patchLocation-=2;␊ |
844 | ␊ |
845 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
846 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
847 | ␉␊ |
848 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
849 | ␉/*␊ |
850 | ␉bytes[patchLocation++] = 0x8B;␊ |
851 | ␉bytes[patchLocation++] = 0x15;␊ |
852 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
853 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
854 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
855 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
856 | ␉*/␊ |
857 | ␉patchLocation += 6;␊ |
858 | ␉␊ |
859 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
860 | ␉/*␊ |
861 | ␉bytes[patchLocation++] = 0x81;␊ |
862 | ␉bytes[patchLocation++] = 0xC2;␊ |
863 | ␉*/␊ |
864 | ␉patchLocation += 2;␊ |
865 | ␉bytes[patchLocation++] = 0x60;␊ |
866 | ␉/*␊ |
867 | ␉bytes[patchLocation++];// = 0x03;␊ |
868 | ␉bytes[patchLocation++];// = 0x00;␊ |
869 | ␉bytes[patchLocation++];// = 0x00;␊ |
870 | ␉*/␊ |
871 | ␉ patchLocation += 3;␊ |
872 | ␊ |
873 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
874 | ␉bytes[patchLocation++] = 0xC7;␊ |
875 | ␉bytes[patchLocation++] = 0x02;␊ |
876 | ␉bytes[patchLocation++] = 0x00;␊ |
877 | ␉bytes[patchLocation++] = 0x04;␊ |
878 | ␉bytes[patchLocation++] = 0x00;␊ |
879 | ␉bytes[patchLocation++] = 0x00;␊ |
880 | ␉␊ |
881 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
882 | ␉bytes[patchLocation++] = 0x83;␊ |
883 | ␉bytes[patchLocation++] = 0xEA;␊ |
884 | ␉bytes[patchLocation++] = 0x40;␊ |
885 | ␊ |
886 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
887 | ␉bytes[patchLocation++] = 0xA1;␊ |
888 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
889 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
890 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
891 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
892 | ␊ |
893 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
894 | ␉bytes[patchLocation++] = 0x83;␊ |
895 | ␉bytes[patchLocation++] = 0xC0;␊ |
896 | ␉bytes[patchLocation++] = 0x0E;␊ |
897 | ␊ |
898 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
899 | ␉bytes[patchLocation++] = 0x89;␊ |
900 | ␉bytes[patchLocation++] = 0x02;␊ |
901 | ␉␊ |
902 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
903 | ␉bytes[patchLocation++] = 0x81;␊ |
904 | ␉bytes[patchLocation++] = 0xC2;␊ |
905 | ␉bytes[patchLocation++] = 0x30;␊ |
906 | ␉bytes[patchLocation++] = 0x03;␊ |
907 | ␉bytes[patchLocation++] = 0x00;␊ |
908 | ␉bytes[patchLocation++] = 0x00;␊ |
909 | ␉␊ |
910 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
911 | ␉bytes[patchLocation++] = 0xA1;␊ |
912 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
913 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
914 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
915 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
916 | ␉␊ |
917 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
918 | ␉bytes[patchLocation++] = 0x83;␊ |
919 | ␉bytes[patchLocation++] = 0xC0;␊ |
920 | ␉bytes[patchLocation++] = 0x0F;␊ |
921 | ␉␊ |
922 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
923 | ␉bytes[patchLocation++] = 0x89;␊ |
924 | ␉bytes[patchLocation++] = 0x02;␊ |
925 | ␉␊ |
926 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
927 | ␉bytes[patchLocation++] = 0x83;␊ |
928 | ␉bytes[patchLocation++] = 0xEA;␊ |
929 | ␉bytes[patchLocation++] = 0x10;␊ |
930 | ␊ |
931 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
932 | ␉bytes[patchLocation++] = 0xA1;␊ |
933 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
934 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
935 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
936 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
937 | ␉␊ |
938 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
939 | ␉bytes[patchLocation++] = 0x83;␊ |
940 | ␉bytes[patchLocation++] = 0xC0;␊ |
941 | ␉bytes[patchLocation++] = 0x0C;␊ |
942 | ␊ |
943 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
944 | ␉bytes[patchLocation++] = 0x89;␊ |
945 | ␉bytes[patchLocation++] = 0x02;␊ |
946 | ␊ |
947 | ␉// Replace remaining with nops␊ |
948 | ␊ |
949 | ␊ |
950 | ␉bytes[patchLocation++] = 0x90;␊ |
951 | ␉bytes[patchLocation++] = 0x90;␊ |
952 | ␉bytes[patchLocation++] = 0x90;␊ |
953 | ␉bytes[patchLocation++] = 0x90;␊ |
954 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
955 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
956 | }␊ |
957 | |