Root/
Source at commit 1085 created 13 years 1 month ago. By azimutz, Runaway "min"; fixes build. | |
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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_interrupt 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 | ␉// Check to ensure that the patch is valid on this machine␊ |
61 | ␉// If it is not, exit early from this function␊ |
62 | ␉if(cpus != Platform->CPU.Model)␊ |
63 | ␉{␊ |
64 | ␉␉if(cpus != CPUID_MODEL_ANY)␊ |
65 | ␉␉{␊ |
66 | ␉␉␉if(cpus == CPUID_MODEL_UNKNOWN)␊ |
67 | ␉␉␉{␊ |
68 | ␉␉␉␉switch(Platform->CPU.Model)␊ |
69 | ␉␉␉␉{␊ |
70 | ␉␉␉␉␉case 13:␊ |
71 | ␉␉␉␉␉case CPUID_MODEL_YONAH:␊ |
72 | ␉␉␉␉␉case CPUID_MODEL_MEROM:␊ |
73 | ␉␉␉␉␉case CPUID_MODEL_PENRYN:␊ |
74 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM:␊ |
75 | ␉␉␉␉␉case CPUID_MODEL_FIELDS:␊ |
76 | ␉␉␉␉␉case CPUID_MODEL_DALES:␊ |
77 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM_EX:␊ |
78 | ␉␉␉␉␉␉// Known cpu's we don't want to add the patch␊ |
79 | ␉␉␉␉␉␉return;␊ |
80 | ␉␉␉␉␉␉break;␊ |
81 | ␊ |
82 | ␉␉␉␉␉default:␊ |
83 | ␉␉␉␉␉␉// CPU not in supported list, so we are going to add␊ |
84 | ␉␉␉␉␉␉// The patch will be applied␊ |
85 | ␉␉␉␉␉␉break;␊ |
86 | ␉␉␉␉␉␉␊ |
87 | ␉␉␉␉}␊ |
88 | ␉␉␉}␊ |
89 | ␉␉␉else␊ |
90 | ␉␉␉{␊ |
91 | ␉␉␉␉// Invalid cpuid for current cpu. Ignoring patch␊ |
92 | ␉␉␉␉return;␊ |
93 | ␉␉␉}␊ |
94 | ␊ |
95 | ␉␉}␊ |
96 | ␉}␊ |
97 | ␉␉␊ |
98 | ␉if(patches == NULL)␊ |
99 | ␉{␊ |
100 | ␉␉patches = entry = malloc(sizeof(patchRoutine_t));␊ |
101 | ␉}␊ |
102 | ␉else␊ |
103 | ␉{␊ |
104 | ␉␉entry = patches;␊ |
105 | ␉␉while(entry->next)␊ |
106 | ␉␉{␊ |
107 | ␉␉␉entry = entry->next;␊ |
108 | ␉␉}␊ |
109 | ␉␉␊ |
110 | ␉␉entry->next = malloc(sizeof(patchRoutine_t));␊ |
111 | ␉␉entry = entry->next;␊ |
112 | ␉}␊ |
113 | ␉␊ |
114 | ␉entry->next = NULL;␊ |
115 | ␉entry->patchRoutine = patch;␊ |
116 | ␉entry->validArchs = arch;␊ |
117 | ␉entry->validCpu = cpus;␊ |
118 | }␊ |
119 | ␊ |
120 | void register_kernel_symbol(int kernelType, const char* name)␊ |
121 | {␊ |
122 | ␉if(kernelSymbols == NULL)␊ |
123 | ␉{␊ |
124 | ␉␉kernelSymbols = malloc(sizeof(kernSymbols_t));␊ |
125 | ␉␉kernelSymbols->next = NULL;␊ |
126 | ␉␉kernelSymbols->symbol = (char*)name;␊ |
127 | ␉␉kernelSymbols->addr = 0;␊ |
128 | ␉}␊ |
129 | ␉else {␊ |
130 | ␉␉kernSymbols_t *symbol = kernelSymbols;␊ |
131 | ␉␉while(symbol->next != NULL)␊ |
132 | ␉␉{␊ |
133 | ␉␉␉symbol = symbol->next;␊ |
134 | ␉␉}␊ |
135 | ␉␉␊ |
136 | ␉␉symbol->next = malloc(sizeof(kernSymbols_t));␊ |
137 | ␉␉symbol = symbol->next;␊ |
138 | ␊ |
139 | ␉␉symbol->next = NULL;␊ |
140 | ␉␉symbol->symbol = (char*)name;␊ |
141 | ␉␉symbol->addr = 0;␊ |
142 | ␉}␊ |
143 | }␊ |
144 | ␊ |
145 | kernSymbols_t* lookup_kernel_symbol(const char* name)␊ |
146 | {␊ |
147 | ␉kernSymbols_t *symbol = kernelSymbols;␊ |
148 | ␊ |
149 | ␉while(symbol && strcmp(symbol->symbol, name) !=0)␊ |
150 | ␉{␊ |
151 | ␉␉symbol = symbol->next;␊ |
152 | ␉}␊ |
153 | ␉␊ |
154 | ␉if(!symbol)␊ |
155 | ␉{␊ |
156 | ␉␉return NULL;␊ |
157 | ␉}␊ |
158 | ␉else␊ |
159 | ␉{␊ |
160 | ␉␉return symbol;␊ |
161 | ␉}␊ |
162 | ␊ |
163 | }␊ |
164 | ␊ |
165 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4)␊ |
166 | {␊ |
167 | ␉patchRoutine_t* entry = patches;␊ |
168 | ␊ |
169 | ␉␊ |
170 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
171 | ␊ |
172 | ␉locate_symbols(kernelData);␊ |
173 | ␉␊ |
174 | ␉if(patches != NULL)␊ |
175 | ␉{␊ |
176 | ␉␉while(entry)␊ |
177 | ␉␉{␊ |
178 | ␉␉␉if(entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
179 | ␉␉␉{␊ |
180 | ␉␉␉␉if(entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
181 | ␉␉␉}␊ |
182 | ␉␉␉entry = entry->next;␊ |
183 | ␉␉}␊ |
184 | ␉}␊ |
185 | }␊ |
186 | ␊ |
187 | int determineKernelArchitecture(void* kernelData)␊ |
188 | {␉␊ |
189 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
190 | ␉{␊ |
191 | ␉␉return KERNEL_32;␊ |
192 | ␉}␊ |
193 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
194 | ␉{␊ |
195 | ␉␉return KERNEL_64;␊ |
196 | ␉}␊ |
197 | ␉else␊ |
198 | ␉{␊ |
199 | ␉␉return KERNEL_ERR;␊ |
200 | ␉}␊ |
201 | }␊ |
202 | ␊ |
203 | ␊ |
204 | /**␊ |
205 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
206 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
207 | **/␊ |
208 | int locate_symbols(void* kernelData)␊ |
209 | {␊ |
210 | ␉char is64 = 1;␊ |
211 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
212 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
213 | ␉return 1 << is64;␊ |
214 | }␊ |
215 | ␊ |
216 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
217 | {␊ |
218 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
219 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
220 | ␉␊ |
221 | ␉if(symbol)␊ |
222 | ␉{␊ |
223 | ␉␉symbol->addr = addr;␊ |
224 | ␉}␊ |
225 | ␉␊ |
226 | ␉return 0xFFFFFFFF; // fixme␊ |
227 | }␊ |
228 | ␊ |
229 | ␊ |
230 | /**␊ |
231 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
232 | ** Or replace it so that the cpuid is set to a valid value.␊ |
233 | **/␊ |
234 | void patch_cpuid_set_info_all(void* kernelData)␊ |
235 | {␊ |
236 | ␉switch(Platform->CPU.Model)␊ |
237 | ␉{␊ |
238 | ␉␉case CPUID_MODEL_ATOM:␊ |
239 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
240 | ␉␉␉{␊ |
241 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
242 | ␉␉␉}␊ |
243 | ␉␉␉else ␊ |
244 | ␉␉␉{␊ |
245 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
246 | ␊ |
247 | ␉␉␉}␊ |
248 | ␊ |
249 | ␉␉␉break;␊ |
250 | ␉␉␉␊ |
251 | ␉␉default:␊ |
252 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
253 | ␉␉␉{␊ |
254 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, 0, 0);␊ |
255 | ␉␉␉}␊ |
256 | ␉␉␉else␊ |
257 | ␉␉␉{␊ |
258 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, 0, 0);␊ |
259 | ␉␉␉}␊ |
260 | ␊ |
261 | ␉␉␉break;␊ |
262 | ␉}␊ |
263 | }␊ |
264 | void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
265 | {␊ |
266 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
267 | ␉␊ |
268 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
269 | ␉␊ |
270 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
271 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
272 | ␉␊ |
273 | ␉␊ |
274 | ␉␊ |
275 | ␉//UInt32 jumpLocation = 0;␊ |
276 | ␉␊ |
277 | ␉␊ |
278 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
279 | ␉{␊ |
280 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
281 | ␉␉return;␊ |
282 | ␉␉␊ |
283 | ␉}␊ |
284 | ␉␊ |
285 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
286 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
287 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
288 | ␉{␊ |
289 | ␉␉printf("Unable to locate _panic\n");␊ |
290 | ␉␉return;␊ |
291 | ␉}␊ |
292 | ␉panicAddr -= (UInt32)kernelData;␊ |
293 | ␉␊ |
294 | ␉␊ |
295 | ␉␊ |
296 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
297 | ␉while( ␊ |
298 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
299 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
300 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
301 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
302 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
303 | ␉␉ )␊ |
304 | ␉{␊ |
305 | ␉␉patchLocation++;␊ |
306 | ␉}␊ |
307 | ␉patchLocation--;␊ |
308 | ␉␊ |
309 | ␉// Remove panic just in ca se␊ |
310 | ␉// The panic instruction is exactly 5 bytes long.␊ |
311 | ␉bytes[patchLocation + 0] = 0x90;␊ |
312 | ␉bytes[patchLocation + 1] = 0x90;␊ |
313 | ␉bytes[patchLocation + 2] = 0x90;␊ |
314 | ␉bytes[patchLocation + 3] = 0x90;␊ |
315 | ␉bytes[patchLocation + 4] = 0x90;␊ |
316 | ␉␊ |
317 | ␉␊ |
318 | ␉␊ |
319 | ␉// Check for a 10.2.0+ kernel␊ |
320 | ␉if(bytes[patchLocation - 19] == 0xC7 && bytes[patchLocation - 18] == 0x05)␊ |
321 | ␉{␊ |
322 | ␉␉␊ |
323 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 17] << 0 |␊ |
324 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 16] << 8 |␊ |
325 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 15] << 16 |␊ |
326 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 24;␊ |
327 | ␉␉␊ |
328 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
329 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 310; ␊ |
330 | ␉␉␊ |
331 | ␉␉␊ |
332 | ␉␉//ffffff8000228b3b -> 0x00490e8b␊ |
333 | ␉␉//ffffff8000228c28 -> -237 -> 0x490D9E -> -310␊ |
334 | ␉␉␊ |
335 | ␉␉␊ |
336 | ␉␉// The mov is 10 bytes␊ |
337 | ␉␉/*␊ |
338 | ␉␉ bytes[patchLocation - 19] = 0x90;␉// c7␊ |
339 | ␉␉ bytes[patchLocation - 18] = 0x90;␉// 05␊ |
340 | ␉␉ bytes[patchLocation - 17] = 0x90;␉// family location␊ |
341 | ␉␉ bytes[patchLocation - 16] = 0x90;␉// family location␊ |
342 | ␉␉ bytes[patchLocation - 15] = 0x90;␉// family location␊ |
343 | ␉␉ bytes[patchLocation - 14] = 0x90;␉// family location␊ |
344 | ␉␉ */␊ |
345 | ␉␉bytes[patchLocation - 13] = (impersonateFamily & 0x000000FF) >> 0;␊ |
346 | ␉␉bytes[patchLocation - 12] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
347 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
348 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0xFF000000) >> 24;␊ |
349 | ␉␉␊ |
350 | ␉␉␊ |
351 | ␉␉// The lea (%rip),%rip is 7 bytes␊ |
352 | ␉␉bytes[patchLocation - 9] = 0xC7;␊ |
353 | ␉␉bytes[patchLocation - 8] = 0x05;␊ |
354 | ␉␉bytes[patchLocation - 7] = ((cpuid_model_addr -10) & 0x000000FF) >> 0;␉// NOTE: this opcode is relative in 64bit mode, subtract offset␊ |
355 | ␉␉bytes[patchLocation - 6] = ((cpuid_model_addr -10) & 0x0000FF00) >> 8;␉␊ |
356 | ␉␉bytes[patchLocation - 5] = ((cpuid_model_addr -10) & 0x00FF0000) >> 16;␊ |
357 | ␉␉bytes[patchLocation - 4] = ((cpuid_model_addr -10) & 0xFF000000) >> 24;␊ |
358 | ␉␉bytes[patchLocation - 3] = impersonateModel;␉// cpuid_model␊ |
359 | ␉␉␊ |
360 | ␉␉ ␊ |
361 | ␉␉ ␊ |
362 | ␉␉ // The xor eax eax is 2 bytes␊ |
363 | ␉␉bytes[patchLocation - 2] = 0x01;␉// cpuid_extmodel␊ |
364 | ␉␉bytes[patchLocation - 1] = 0x00;␉// cpuid_extfamily␊ |
365 | ␉␉␊ |
366 | ␉␉// The panic instruction is exactly 5 bytes long.␊ |
367 | ␉␉bytes[patchLocation - 0] = 0x02;␉// cpuid_stepping␊ |
368 | ␉␉/*bytes[patchLocation + 1] = 0x90;␊ |
369 | ␉␉bytes[patchLocation + 2] = 0x90;␊ |
370 | ␉␉bytes[patchLocation + 3] = 0x90;␊ |
371 | ␉␉bytes[patchLocation + 4] = 0x90;␊ |
372 | ␉␉*/␊ |
373 | ␉␉␊ |
374 | ␉␉// Panic call has been removed.␊ |
375 | ␉␉// Override the CPUID now. This requires ~ 10 bytes on 10.0.0 kernels␊ |
376 | ␉␉// On 10.2.0+ kernels, this requires ~16 bytes␊ |
377 | ␉␉␊ |
378 | ␉␉// Total: 24 bytes␊ |
379 | ␉␉printf("Running on a 10.2.0+ kernel\n");␊ |
380 | ␉␉getc();␊ |
381 | ␊ |
382 | ␉}␊ |
383 | ␉else {␊ |
384 | ␉␉printf("Running on a 10.0.0 kernel, patch unsupported\n");␊ |
385 | ␉␉getc();␊ |
386 | ␉}␊ |
387 | ␊ |
388 | ␉␊ |
389 | }␊ |
390 | ␊ |
391 | ␊ |
392 | ␊ |
393 | ␊ |
394 | ␊ |
395 | void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
396 | {␊ |
397 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
398 | ␉␊ |
399 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
400 | ␊ |
401 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
402 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
403 | ␉UInt32 addrLocation = patchLocation;␊ |
404 | ␉␊ |
405 | ␊ |
406 | ␉UInt32 jumpLocation = 0;␊ |
407 | ␉␊ |
408 | ␉␊ |
409 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
410 | ␉{␊ |
411 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
412 | ␉␉return;␊ |
413 | ␉␉␊ |
414 | ␉}␊ |
415 | ␊ |
416 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
417 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
418 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
419 | ␉{␊ |
420 | ␉␉printf("Unable to locate _panic\n");␊ |
421 | ␉␉return;␊ |
422 | ␉}␊ |
423 | ␉panicAddr -= (UInt32)kernelData;␊ |
424 | ␊ |
425 | ␉␊ |
426 | ␊ |
427 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
428 | ␉while( ␊ |
429 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
430 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
431 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
432 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
433 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
434 | ␉␉ )␊ |
435 | ␉{␊ |
436 | ␉␉patchLocation++;␊ |
437 | ␉}␊ |
438 | ␉patchLocation--;␊ |
439 | ␉␊ |
440 | ␉// Remove panic call, just in case the following patch routines fail␊ |
441 | ␉bytes[patchLocation + 0] = 0x90;␊ |
442 | ␉bytes[patchLocation + 1] = 0x90;␊ |
443 | ␉bytes[patchLocation + 2] = 0x90;␊ |
444 | ␉bytes[patchLocation + 3] = 0x90;␊ |
445 | ␉bytes[patchLocation + 4] = 0x90;␊ |
446 | ␉␊ |
447 | ␉␊ |
448 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
449 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
450 | ␉jumpLocation = patchLocation - 15;␊ |
451 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
452 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - 18)) &&␊ |
453 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
454 | ␉{␊ |
455 | ␉␉jumpLocation--;␊ |
456 | ␉}␊ |
457 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
458 | ␉if(impersonateFamily && impersonateModel &&␊ |
459 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
460 | ␉{␊ |
461 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
462 | ␉␉␊ |
463 | ␉␉/* ␊ |
464 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
465 | ␉␉ */␊ |
466 | ␉␉//␉␉␉␉␉␉␉␉␉cpuid_cpufamily_addr, impersonateFamily␉␉␉␉␉␉␉␉␉cpuid_model_addr␉ impersonateModel␊ |
467 | ␉␉//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};␊ |
468 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
469 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
470 | ␉␉//UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
471 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 8 |␊ |
472 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 13] << 16 |␊ |
473 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 12] << 24;␊ |
474 | ␉␉␊ |
475 | ␉␉// NOTE: may change, determined based on cpuid_info struct: TODO: read from binary␊ |
476 | ␉␉//UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 295; ␊ |
477 | ␉␉␊ |
478 | ␉␉␊ |
479 | ␉␉// cpufamily␊ |
480 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
481 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
482 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
483 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
484 | ␉␉␊ |
485 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
486 | ␉␉// nop and continue with the rest of the patch␊ |
487 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
488 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
489 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
490 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
491 | ␉␉␊ |
492 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
493 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
494 | ␉␉␊ |
495 | ␉␉// Locate cpuid_addr_addr -> first four bytes after 8b 45 d8 25 f0 00 00 00 c1 e8 04 a2␊ |
496 | ␉␉while(bytes[addrLocation -12] != 0x8B ||␊ |
497 | ␉␉␉ bytes[addrLocation -11] != 0x45 ||␊ |
498 | ␉␉␉ bytes[addrLocation -10] != 0xD8 ||␊ |
499 | ␉␉␉ bytes[addrLocation -9] != 0x25 ||␊ |
500 | ␉␉␉ bytes[addrLocation -8] != 0xF0 ||␊ |
501 | ␉␉␉ bytes[addrLocation -7] != 0x00 ||␊ |
502 | ␉␉␉ bytes[addrLocation -6] != 0x00 ||␊ |
503 | ␉␉␉ bytes[addrLocation -5] != 0x00 ||␊ |
504 | ␉␉␉ bytes[addrLocation -4] != 0xC1 ||␊ |
505 | ␉␉␉ bytes[addrLocation -3] != 0xE8 ||␊ |
506 | ␉␉␉ bytes[addrLocation -2] != 0x04 ||␊ |
507 | ␉␉␉ bytes[addrLocation -1] != 0xA2)␊ |
508 | ␉␉{␊ |
509 | ␉␉␉// TODO: break if location is too large␊ |
510 | ␉␉␉addrLocation++;␊ |
511 | ␉␉}␉␉␊ |
512 | ␉␉␊ |
513 | ␉␉bytes[patchLocation - 3] = bytes[addrLocation];␊ |
514 | ␉␉bytes[patchLocation - 2] = bytes[addrLocation+1];␉␊ |
515 | ␉␉bytes[patchLocation - 1] = bytes[addrLocation+2];␊ |
516 | ␉␉bytes[patchLocation - 0] = bytes[addrLocation+3];␊ |
517 | ␉␉␊ |
518 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
519 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
520 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
521 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
522 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
523 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␉␉␊ |
524 | ␉}␊ |
525 | ␉else if(impersonateFamily && impersonateModel)␊ |
526 | ␉{␊ |
527 | ␊ |
528 | ␉␉// pre 10.6.2 kernel␊ |
529 | ␉␉// Locate the jump to directly *after* the panic call,␊ |
530 | ␉␉jumpLocation = patchLocation - 4;␊ |
531 | ␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
532 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
533 | ␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
534 | ␉␉{␊ |
535 | ␉␉␉jumpLocation--;␊ |
536 | ␉␉}␊ |
537 | ␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
538 | ␉␉// I'll just leave it to verify the binary stucture.␊ |
539 | ␉␉␊ |
540 | ␉␉// NOTE: the cpumodel_familt data is not set in _cpuid_set_info␊ |
541 | ␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
542 | ␉␉// we set now.␊ |
543 | ␉␉␊ |
544 | ␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
545 | ␉␉{␊ |
546 | ␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
547 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
548 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
549 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
550 | ␉␉␉// Remove jump␊ |
551 | ␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
552 | ␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
553 | ␉␉␉␊ |
554 | ␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
555 | ␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
556 | ␉␉␉␊ |
557 | ␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
558 | ␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
559 | ␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
560 | ␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
561 | ␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
562 | ␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
563 | ␉␉␉␊ |
564 | ␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
565 | ␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
566 | ␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
567 | ␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
568 | ␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
569 | ␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
570 | ␉␉␉␊ |
571 | ␉␉␉␊ |
572 | ␉␉␉␊ |
573 | ␉␉␉//patchLocation = jumpLocation;␊ |
574 | ␉␉␉// We now have 14 bytes available for a patch␊ |
575 | ␊ |
576 | ␉␉}␊ |
577 | ␉␉else ␊ |
578 | ␉␉{␊ |
579 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
580 | ␉␉}␊ |
581 | ␉}␊ |
582 | ␉else ␊ |
583 | ␉{␊ |
584 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
585 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
586 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
587 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
588 | ␉}␊ |
589 | }␊ |
590 | ␊ |
591 | ␊ |
592 | /**␊ |
593 | ** SleepEnabler.kext replacement (for those that need it)␊ |
594 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
595 | **/␊ |
596 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
597 | {␊ |
598 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
599 | ␊ |
600 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
601 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
602 | ␉␊ |
603 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
604 | ␉{␊ |
605 | ␉␉printf("Unable to locate _pmCPUExitHaltToOff\n");␊ |
606 | ␉␉return;␊ |
607 | ␉}␊ |
608 | ␉␊ |
609 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
610 | ␉␊ |
611 | ␉␊ |
612 | ␉␊ |
613 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
614 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
615 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
616 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
617 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
618 | ␊ |
619 | ␉{␊ |
620 | ␉␉patchLocation++;␊ |
621 | ␉}␊ |
622 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
623 | }␊ |
624 | ␊ |
625 | void patch_lapic_init(void* kernelData)␊ |
626 | {␊ |
627 | ␉UInt8 panicIndex = 0;␊ |
628 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
629 | ␉␊ |
630 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
631 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
632 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
633 | ␉{␊ |
634 | ␉␉printf("Unable to locate %s\n", "_lapic_init");␊ |
635 | ␉␉return;␊ |
636 | ␉␉␊ |
637 | ␉}␊ |
638 | ␉␊ |
639 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
640 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
641 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
642 | ␉{␊ |
643 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
644 | ␉␉return;␊ |
645 | ␉}␊ |
646 | ␉␊ |
647 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
648 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
649 | ␊ |
650 | ␉␊ |
651 | ␉␊ |
652 | ␉␊ |
653 | ␉// Locate the (panicIndex + 1) panic call␊ |
654 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
655 | ␉{␊ |
656 | ␉␉while( ␊ |
657 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
658 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
659 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
660 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
661 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
662 | ␉␉␉ )␊ |
663 | ␉␉{␊ |
664 | ␉␉␉patchLocation++;␊ |
665 | ␉␉}␊ |
666 | ␉␉patchLocation++;␊ |
667 | ␉␉panicIndex++;␊ |
668 | ␉}␊ |
669 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
670 | ␉␊ |
671 | ␉bytes[--patchLocation] = 0x90;␉␊ |
672 | ␉bytes[++patchLocation] = 0x90;␊ |
673 | ␉bytes[++patchLocation] = 0x90;␊ |
674 | ␉bytes[++patchLocation] = 0x90;␊ |
675 | ␉bytes[++patchLocation] = 0x90;␊ |
676 | ␉␊ |
677 | ␉␊ |
678 | }␊ |
679 | ␊ |
680 | ␊ |
681 | void patch_commpage_stuff_routine(void* kernelData)␊ |
682 | {␊ |
683 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
684 | ␊ |
685 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
686 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
687 | ␉{␊ |
688 | ␉␉//printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
689 | ␉␉return;␊ |
690 | ␉␉␊ |
691 | ␉}␊ |
692 | ␉␊ |
693 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
694 | ␊ |
695 | ␉␊ |
696 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
697 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
698 | ␉{␊ |
699 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
700 | ␉␉return;␊ |
701 | ␉}␊ |
702 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
703 | ␊ |
704 | ␉patchLocation -= (UInt32)kernelData;␊ |
705 | ␉panicAddr -= (UInt32)kernelData;␊ |
706 | ␉␊ |
707 | ␉while( ␊ |
708 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
709 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
710 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
711 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
712 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
713 | ␉␉ )␊ |
714 | ␉{␊ |
715 | ␉␉patchLocation++;␊ |
716 | ␉}␊ |
717 | ␉patchLocation--;␊ |
718 | ␉␊ |
719 | ␉// Replace panic with nops␊ |
720 | ␉bytes[patchLocation + 0] = 0x90;␊ |
721 | ␉bytes[patchLocation + 1] = 0x90;␊ |
722 | ␉bytes[patchLocation + 2] = 0x90;␊ |
723 | ␉bytes[patchLocation + 3] = 0x90;␊ |
724 | ␉bytes[patchLocation + 4] = 0x90;␊ |
725 | ␉␊ |
726 | ␉␊ |
727 | }␊ |
728 | ␊ |
729 | void patch_lapic_interrupt(void* kernelData)␊ |
730 | {␊ |
731 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
732 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
733 | ␉␊ |
734 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
735 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
736 | ␉{␊ |
737 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt");␊ |
738 | ␉␉return;␊ |
739 | ␉␉␊ |
740 | ␉}␊ |
741 | ␉␊ |
742 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
743 | ␉␊ |
744 | ␉␊ |
745 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
746 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
747 | ␉{␊ |
748 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
749 | ␉␉return;␊ |
750 | ␉}␊ |
751 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
752 | ␉␊ |
753 | ␉patchLocation -= (UInt32)kernelData;␊ |
754 | ␉panicAddr -= (UInt32)kernelData;␊ |
755 | ␉␊ |
756 | ␉while( ␊ |
757 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
758 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
759 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
760 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
761 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
762 | ␉␉ )␊ |
763 | ␉{␊ |
764 | ␉␉patchLocation++;␊ |
765 | ␉}␊ |
766 | ␉patchLocation--;␊ |
767 | ␉␊ |
768 | ␉// Replace panic with nops␊ |
769 | ␉bytes[patchLocation + 0] = 0x90;␊ |
770 | ␉bytes[patchLocation + 1] = 0x90;␊ |
771 | ␉bytes[patchLocation + 2] = 0x90;␊ |
772 | ␉bytes[patchLocation + 3] = 0x90;␊ |
773 | ␉bytes[patchLocation + 4] = 0x90;␊ |
774 | ␉␊ |
775 | ␉␊ |
776 | }␊ |
777 | ␊ |
778 | ␊ |
779 | void patch_lapic_configure(void* kernelData)␊ |
780 | {␊ |
781 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
782 | ␉␊ |
783 | ␉UInt32 patchLocation;␊ |
784 | ␉UInt32 lapicStart;␊ |
785 | ␉UInt32 lapicInterruptBase;␊ |
786 | ␉␊ |
787 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
788 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
789 | ␉{␊ |
790 | ␉␉printf("Unable to locate %s\n", "_lapic_configure");␊ |
791 | ␉␉return;␊ |
792 | ␉}␊ |
793 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
794 | ␉␊ |
795 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
796 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
797 | ␉{␊ |
798 | ␉␉printf("Unable to locate %s\n", "_lapic_start");␊ |
799 | ␉␉return;␊ |
800 | ␉}␊ |
801 | ␉lapicStart = symbol->addr; ␊ |
802 | ␊ |
803 | ␊ |
804 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
805 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
806 | ␉{␊ |
807 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
808 | ␉␉return;␊ |
809 | ␉}␊ |
810 | ␉lapicInterruptBase = symbol->addr;␊ |
811 | ␉patchLocation -= (UInt32)kernelData;␊ |
812 | ␉lapicStart -= (UInt32)kernelData;␊ |
813 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
814 | ␉␊ |
815 | ␉␊ |
816 | ␉// Looking for the following:␊ |
817 | ␉//movl _lapic_start,%e_x␊ |
818 | ␉//addl $0x00000320,%e_x␊ |
819 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
820 | ␉while( ␊ |
821 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
822 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
823 | ␉␉ ( lapicStart != (UInt32)(␊ |
824 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
825 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
826 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
827 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
828 | ␉␉␉␉␉␉␉␉␉)␊ |
829 | ␉␉␉␉␉␉␉␉ )␊ |
830 | ␉␉ ) || ␊ |
831 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
832 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
833 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
834 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
835 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
836 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
837 | ␊ |
838 | ␉␉ )␊ |
839 | ␉{␊ |
840 | ␉␉patchLocation++;␊ |
841 | ␉}␊ |
842 | ␉patchLocation-=2;␊ |
843 | ␊ |
844 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
845 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
846 | ␉␊ |
847 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
848 | ␉/*␊ |
849 | ␉bytes[patchLocation++] = 0x8B;␊ |
850 | ␉bytes[patchLocation++] = 0x15;␊ |
851 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
852 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
853 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
854 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
855 | ␉*/␊ |
856 | ␉patchLocation += 6;␊ |
857 | ␉␊ |
858 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
859 | ␉/*␊ |
860 | ␉bytes[patchLocation++] = 0x81;␊ |
861 | ␉bytes[patchLocation++] = 0xC2;␊ |
862 | ␉*/␊ |
863 | ␉patchLocation += 2;␊ |
864 | ␉bytes[patchLocation++] = 0x60;␊ |
865 | ␉/*␊ |
866 | ␉bytes[patchLocation++];// = 0x03;␊ |
867 | ␉bytes[patchLocation++];// = 0x00;␊ |
868 | ␉bytes[patchLocation++];// = 0x00;␊ |
869 | ␉*/␊ |
870 | ␉ patchLocation += 3;␊ |
871 | ␊ |
872 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
873 | ␉bytes[patchLocation++] = 0xC7;␊ |
874 | ␉bytes[patchLocation++] = 0x02;␊ |
875 | ␉bytes[patchLocation++] = 0x00;␊ |
876 | ␉bytes[patchLocation++] = 0x04;␊ |
877 | ␉bytes[patchLocation++] = 0x00;␊ |
878 | ␉bytes[patchLocation++] = 0x00;␊ |
879 | ␉␊ |
880 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
881 | ␉bytes[patchLocation++] = 0x83;␊ |
882 | ␉bytes[patchLocation++] = 0xEA;␊ |
883 | ␉bytes[patchLocation++] = 0x40;␊ |
884 | ␊ |
885 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
886 | ␉bytes[patchLocation++] = 0xA1;␊ |
887 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
888 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
889 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
890 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
891 | ␊ |
892 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
893 | ␉bytes[patchLocation++] = 0x83;␊ |
894 | ␉bytes[patchLocation++] = 0xC0;␊ |
895 | ␉bytes[patchLocation++] = 0x0E;␊ |
896 | ␊ |
897 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
898 | ␉bytes[patchLocation++] = 0x89;␊ |
899 | ␉bytes[patchLocation++] = 0x02;␊ |
900 | ␉␊ |
901 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
902 | ␉bytes[patchLocation++] = 0x81;␊ |
903 | ␉bytes[patchLocation++] = 0xC2;␊ |
904 | ␉bytes[patchLocation++] = 0x30;␊ |
905 | ␉bytes[patchLocation++] = 0x03;␊ |
906 | ␉bytes[patchLocation++] = 0x00;␊ |
907 | ␉bytes[patchLocation++] = 0x00;␊ |
908 | ␉␊ |
909 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
910 | ␉bytes[patchLocation++] = 0xA1;␊ |
911 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
912 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
913 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
914 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
915 | ␉␊ |
916 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
917 | ␉bytes[patchLocation++] = 0x83;␊ |
918 | ␉bytes[patchLocation++] = 0xC0;␊ |
919 | ␉bytes[patchLocation++] = 0x0F;␊ |
920 | ␉␊ |
921 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
922 | ␉bytes[patchLocation++] = 0x89;␊ |
923 | ␉bytes[patchLocation++] = 0x02;␊ |
924 | ␉␊ |
925 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
926 | ␉bytes[patchLocation++] = 0x83;␊ |
927 | ␉bytes[patchLocation++] = 0xEA;␊ |
928 | ␉bytes[patchLocation++] = 0x10;␊ |
929 | ␊ |
930 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
931 | ␉bytes[patchLocation++] = 0xA1;␊ |
932 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
933 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
934 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
935 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
936 | ␉␊ |
937 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
938 | ␉bytes[patchLocation++] = 0x83;␊ |
939 | ␉bytes[patchLocation++] = 0xC0;␊ |
940 | ␉bytes[patchLocation++] = 0x0C;␊ |
941 | ␊ |
942 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
943 | ␉bytes[patchLocation++] = 0x89;␊ |
944 | ␉bytes[patchLocation++] = 0x02;␊ |
945 | ␊ |
946 | ␉// Replace remaining with nops␊ |
947 | ␊ |
948 | ␊ |
949 | ␉bytes[patchLocation++] = 0x90;␊ |
950 | ␉bytes[patchLocation++] = 0x90;␊ |
951 | ␉bytes[patchLocation++] = 0x90;␊ |
952 | ␉bytes[patchLocation++] = 0x90;␊ |
953 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
954 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
955 | }␊ |
956 |