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 | void kernel_patcher_ignore_cache(void* arg1, void* arg2, void* arg3, void *arg4, void* arg5, void* arg6){}␊ |
16 | ␊ |
17 | void KernelPatcher_start()␊ |
18 | {␊ |
19 | ␉register_kernel_patch(patch_cpuid_set_info_all, KERNEL_ANY, CPUID_MODEL_UNKNOWN); ␊ |
20 | ␊ |
21 | ␉register_kernel_patch(patch_commpage_stuff_routine, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
22 | ␉␊ |
23 | ␉register_kernel_patch(patch_lapic_init, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
24 | ␊ |
25 | ␉// NOTE: following is currently 32bit only␊ |
26 | ␉register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊ |
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 | ␉// TODO: register needed symbols␊ |
44 | ␊ |
45 | ␉register_hook_callback("ExecKernel", &patch_kernel); ␊ |
46 | ␉␊ |
47 | ␉replace_function("_getKernelCachePath", &kernel_patcher_ignore_cache);␊ |
48 | }␊ |
49 | ␊ |
50 | /*␊ |
51 | * Register a kerenl patch␊ |
52 | */␊ |
53 | void register_kernel_patch(void* patch, int arch, int cpus)␊ |
54 | {␊ |
55 | ␉// TODO: only insert valid patches based on current cpuid and architecture␊ |
56 | ␉// AKA, don't at 64bit patches if it's a 32bit only machine␊ |
57 | ␉patchRoutine_t* entry;␊ |
58 | ␉␊ |
59 | ␉// TODO: verify Platform->CPU.Model is populated this early in bootup␊ |
60 | ␉// Check to ensure that the patch is valid on this machine␊ |
61 | ␉// If it is not, exit early form 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 | ␉␉␉else␊ |
89 | ␉␉␉{␊ |
90 | ␉␉␉␉// Invalid cpuid for current cpu. Ignoring patch␊ |
91 | ␉␉␉␉return;␊ |
92 | ␉␉␉}␊ |
93 | ␉␉}␊ |
94 | ␉}␊ |
95 | ␉␉␊ |
96 | ␉if(patches == NULL)␊ |
97 | ␉{␊ |
98 | ␉␉patches = entry = malloc(sizeof(patchRoutine_t));␊ |
99 | ␉}␊ |
100 | ␉else␊ |
101 | ␉{␊ |
102 | ␉␉entry = patches;␊ |
103 | ␉␉while(entry->next)␊ |
104 | ␉␉{␊ |
105 | ␉␉␉entry = entry->next;␊ |
106 | ␉␉}␊ |
107 | ␉␉␊ |
108 | ␉␉entry->next = malloc(sizeof(patchRoutine_t));␊ |
109 | ␉␉entry = entry->next;␊ |
110 | ␉}␊ |
111 | ␉␊ |
112 | ␉entry->next = NULL;␊ |
113 | ␉entry->patchRoutine = patch;␊ |
114 | ␉entry->validArchs = arch;␊ |
115 | ␉entry->validCpu = cpus;␊ |
116 | }␊ |
117 | ␊ |
118 | void register_kernel_symbol(int kernelType, const char* name)␊ |
119 | {␊ |
120 | ␉if(kernelSymbols == NULL)␊ |
121 | ␉{␊ |
122 | ␉␉kernelSymbols = malloc(sizeof(kernSymbols_t));␊ |
123 | ␉␉kernelSymbols->next = NULL;␊ |
124 | ␉␉kernelSymbols->symbol = (char*)name;␊ |
125 | ␉␉kernelSymbols->addr = 0;␊ |
126 | ␉}␊ |
127 | ␉else␊ |
128 | ␉{␊ |
129 | ␉␉kernSymbols_t *symbol = kernelSymbols;␊ |
130 | ␉␉while(symbol->next != NULL)␊ |
131 | ␉␉{␊ |
132 | ␉␉␉symbol = symbol->next;␊ |
133 | ␉␉}␊ |
134 | ␉␉␊ |
135 | ␉␉symbol->next = malloc(sizeof(kernSymbols_t));␊ |
136 | ␉␉symbol = symbol->next;␊ |
137 | ␊ |
138 | ␉␉symbol->next = NULL;␊ |
139 | ␉␉symbol->symbol = (char*)name;␊ |
140 | ␉␉symbol->addr = 0;␊ |
141 | ␉}␊ |
142 | }␊ |
143 | ␊ |
144 | kernSymbols_t* lookup_kernel_symbol(const char* name)␊ |
145 | {␊ |
146 | ␉kernSymbols_t *symbol = kernelSymbols;␊ |
147 | ␊ |
148 | ␉while(symbol && strcmp(symbol->symbol, name) !=0)␊ |
149 | ␉{␊ |
150 | ␉␉symbol = symbol->next;␊ |
151 | ␉}␊ |
152 | ␉␊ |
153 | ␉if(!symbol)␊ |
154 | ␉{␊ |
155 | ␉␉return NULL;␊ |
156 | ␉}␊ |
157 | ␉else␊ |
158 | ␉{␊ |
159 | ␉␉return symbol;␊ |
160 | ␉}␊ |
161 | }␊ |
162 | ␊ |
163 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4, void* arg5, void* arg6)␊ |
164 | {␊ |
165 | ␉patchRoutine_t* entry = patches;␊ |
166 | ␊ |
167 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
168 | ␊ |
169 | ␉locate_symbols(kernelData);␊ |
170 | ␉␊ |
171 | ␉if(patches != NULL)␊ |
172 | ␉{␊ |
173 | ␉␉while(entry)␊ |
174 | ␉␉{␊ |
175 | ␉␉␉if(entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
176 | ␉␉␉{␊ |
177 | ␉␉␉␉if(entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
178 | ␉␉␉}␊ |
179 | ␉␉␉entry = entry->next;␊ |
180 | ␉␉}␊ |
181 | ␉}␊ |
182 | }␊ |
183 | ␊ |
184 | int determineKernelArchitecture(void* kernelData)␊ |
185 | {␉␊ |
186 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
187 | ␉{␊ |
188 | ␉␉return KERNEL_32;␊ |
189 | ␉}␊ |
190 | ␊ |
191 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
192 | ␉{␊ |
193 | ␉␉return KERNEL_64;␊ |
194 | ␉}␊ |
195 | ␉else␊ |
196 | ␉{␊ |
197 | ␉␉return KERNEL_ERR;␊ |
198 | ␉}␊ |
199 | }␊ |
200 | ␊ |
201 | /**␊ |
202 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
203 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
204 | **/␊ |
205 | int locate_symbols(void* kernelData)␊ |
206 | {␊ |
207 | ␉char is64 = 1;␊ |
208 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
209 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
210 | ␉return 1 << is64;␊ |
211 | }␊ |
212 | ␊ |
213 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
214 | {␊ |
215 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
216 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
217 | ␉␊ |
218 | ␉if(symbol)␊ |
219 | ␉{␊ |
220 | ␉␉symbol->addr = addr;␊ |
221 | ␉}␊ |
222 | ␉␊ |
223 | ␉return 0xFFFFFFFF; // fixme␊ |
224 | }␊ |
225 | ␊ |
226 | /**␊ |
227 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
228 | ** Or replace it so that the cpuid is set to a valid value.␊ |
229 | **/␊ |
230 | void patch_cpuid_set_info_all(void* kernelData)␊ |
231 | {␊ |
232 | ␉// AnV: Extra cpuid fix for spoofing Nehalem CPU for i5/i9␊ |
233 | ␉switch(Platform->CPU.Family)␊ |
234 | ␉{␊ |
235 | ␉␉case 0x1E: /* Intel i5 */␊ |
236 | ␉␉case 0x2C: /* Intel i9 */␊ |
237 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
238 | ␉␉␉{␊ |
239 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_NEHALEM, CPUID_MODEL_NEHALEM);␊ |
240 | ␉␉␉}␊ |
241 | ␉␉␉else ␊ |
242 | ␉␉␉{␊ |
243 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_NEHALEM, CPUID_MODEL_NEHALEM);␊ |
244 | ␉␉␉}␊ |
245 | ␉␉␉␊ |
246 | ␉␉␉break;␊ |
247 | ␉}␊ |
248 | ␊ |
249 | ␉switch(Platform->CPU.Model)␊ |
250 | ␉{␊ |
251 | ␉␉case CPUID_MODEL_ATOM:␊ |
252 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
253 | ␉␉␉{␊ |
254 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN);␊ |
255 | ␉␉␉}␊ |
256 | ␉␉␉else ␊ |
257 | ␉␉␉{␊ |
258 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN);␊ |
259 | ␉␉␉}␊ |
260 | ␊ |
261 | ␉␉␉break;␊ |
262 | ␊ |
263 | ␉␉default:␊ |
264 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
265 | ␉␉␉{␊ |
266 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, 0, 0);␊ |
267 | ␉␉␉}␊ |
268 | ␉␉␉else␊ |
269 | ␉␉␉{␊ |
270 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, 0, 0);␊ |
271 | ␉␉␉}␊ |
272 | ␊ |
273 | ␉␉␉break;␊ |
274 | ␉}␊ |
275 | }␊ |
276 | ␊ |
277 | void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
278 | {␊ |
279 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
280 | ␉␊ |
281 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
282 | ␉␊ |
283 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
284 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
285 | ␊ |
286 | ␉//UInt32 jumpLocation = 0;␊ |
287 | ␊ |
288 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
289 | ␉{␊ |
290 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
291 | ␉␉return;␊ |
292 | ␉}␊ |
293 | ␉␊ |
294 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
295 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
296 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
297 | ␉{␊ |
298 | ␉␉printf("Unable to locate _panic\n");␊ |
299 | ␉␉return;␊ |
300 | ␉}␊ |
301 | ␉panicAddr -= (UInt32)kernelData;␊ |
302 | ␊ |
303 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
304 | ␉while( ␊ |
305 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
306 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
307 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
308 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
309 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
310 | ␉␉ )␊ |
311 | ␉{␊ |
312 | ␉␉patchLocation++;␊ |
313 | ␉}␊ |
314 | ␉patchLocation--;␊ |
315 | ␊ |
316 | ␉// Remove panic just in ca se␊ |
317 | ␉// The panic instruction is exactly 5 bytes long.␊ |
318 | ␉bytes[patchLocation + 0] = 0x90;␊ |
319 | ␉bytes[patchLocation + 1] = 0x90;␊ |
320 | ␉bytes[patchLocation + 2] = 0x90;␊ |
321 | ␉bytes[patchLocation + 3] = 0x90;␊ |
322 | ␉bytes[patchLocation + 4] = 0x90;␊ |
323 | ␊ |
324 | ␉// Check for a 10.2.0+ kernel␊ |
325 | ␉if(bytes[patchLocation - 19] == 0xC7 && bytes[patchLocation - 18] == 0x05)␊ |
326 | ␉{␊ |
327 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 17] << 0 |␊ |
328 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 16] << 8 |␊ |
329 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 15] << 16 |␊ |
330 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 24;␊ |
331 | ␉␉␊ |
332 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
333 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 310; ␊ |
334 | ␊ |
335 | ␉␉//ffffff8000228b3b -> 0x00490e8b␊ |
336 | ␉␉//ffffff8000228c28 -> -237 -> 0x490D9E -> -310␊ |
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 | ␉␉// 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 | ␉␉// The xor eax eax is 2 bytes␊ |
362 | ␉␉bytes[patchLocation - 2] = 0x01;␉// cpuid_extmodel␊ |
363 | ␉␉bytes[patchLocation - 1] = 0x00;␉// cpuid_extfamily␊ |
364 | ␉␉␊ |
365 | ␉␉// The panic instruction is exactly 5 bytes long.␊ |
366 | ␉␉bytes[patchLocation - 0] = 0x02;␉// cpuid_stepping␊ |
367 | ␉␉/*bytes[patchLocation + 1] = 0x90;␊ |
368 | ␉␉bytes[patchLocation + 2] = 0x90;␊ |
369 | ␉␉bytes[patchLocation + 3] = 0x90;␊ |
370 | ␉␉bytes[patchLocation + 4] = 0x90;␊ |
371 | ␉␉*/␊ |
372 | ␉␉␊ |
373 | ␉␉// Panic call has been removed.␊ |
374 | ␉␉// Override the CPUID now. This requires ~ 10 bytes on 10.0.0 kernels␊ |
375 | ␉␉// On 10.2.0+ kernels, this requires ~16 bytes␊ |
376 | ␉␉␊ |
377 | ␉␉// Total: 24 bytes␊ |
378 | ␉␉printf("Running on a 10.2.0+ kernel\n");␊ |
379 | ␉␉getc();␊ |
380 | ␉}␊ |
381 | ␉else {␊ |
382 | ␉␉printf("Running on a 10.0.0 kernel, patch unsupported\n");␊ |
383 | ␉␉getc();␊ |
384 | ␉}␊ |
385 | }␊ |
386 | ␊ |
387 | void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
388 | {␉␊ |
389 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
390 | ␉␊ |
391 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
392 | ␊ |
393 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
394 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
395 | ␊ |
396 | ␉UInt32 jumpLocation = 0;␉␊ |
397 | ␊ |
398 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
399 | ␉{␊ |
400 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
401 | ␉␉return;␊ |
402 | ␉}␊ |
403 | ␊ |
404 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
405 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
406 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
407 | ␉{␊ |
408 | ␉␉printf("Unable to locate _panic\n");␊ |
409 | ␉␉return;␊ |
410 | ␉}␊ |
411 | ␉panicAddr -= (UInt32)kernelData;␊ |
412 | ␊ |
413 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
414 | ␉while( ␊ |
415 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
416 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
417 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
418 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
419 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
420 | ␉␉ )␊ |
421 | ␉{␊ |
422 | ␉␉patchLocation++;␊ |
423 | ␉}␊ |
424 | ␉patchLocation--;␊ |
425 | ␉␊ |
426 | ␉// Remove panic call, just in case the following patch routines fail␊ |
427 | ␉bytes[patchLocation + 0] = 0x90;␊ |
428 | ␉bytes[patchLocation + 1] = 0x90;␊ |
429 | ␉bytes[patchLocation + 2] = 0x90;␊ |
430 | ␉bytes[patchLocation + 3] = 0x90;␊ |
431 | ␉bytes[patchLocation + 4] = 0x90;␊ |
432 | ␊ |
433 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
434 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
435 | ␉jumpLocation = patchLocation - 15;␊ |
436 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
437 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -8)) &&␊ |
438 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
439 | ␉{␊ |
440 | ␉␉jumpLocation--;␊ |
441 | ␉}␊ |
442 | ␉␊ |
443 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
444 | ␉if(impersonateFamily &&␊ |
445 | ␉ impersonateModel &&␊ |
446 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
447 | ␉{␊ |
448 | ␉␉␊ |
449 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
450 | ␉␉␊ |
451 | ␉␉/* ␊ |
452 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
453 | ␉␉ */␊ |
454 | ␉␉␊ |
455 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
456 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
457 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
458 | ␉␉bytes[patchLocation - 14] << 8 |␊ |
459 | ␉␉bytes[patchLocation - 13] << 16 |␊ |
460 | ␉␉bytes[patchLocation - 12] << 24;␊ |
461 | ␉␉␊ |
462 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
463 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 299; ␊ |
464 | ␊ |
465 | ␉␉// cpufamily␊ |
466 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
467 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
468 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
469 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
470 | ␉␉␊ |
471 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
472 | ␉␉// nop and continue with the rest of the patch␊ |
473 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
474 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
475 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
476 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
477 | ␉␉␊ |
478 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
479 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
480 | ␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
481 | ␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
482 | ␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
483 | ␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
484 | ␉␉␊ |
485 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
486 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
487 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
488 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
489 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
490 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
491 | ␉}␊ |
492 | ␉else if(impersonateFamily && impersonateModel)␊ |
493 | ␉{␊ |
494 | ␉␉// pre 10.6.2 kernel␊ |
495 | ␉␉// Locate the jump to directly *after* the panic call,␊ |
496 | ␉␉jumpLocation = patchLocation - 4;␊ |
497 | ␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
498 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
499 | ␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
500 | ␉␉{␊ |
501 | ␉␉␉jumpLocation--;␊ |
502 | ␉␉}␊ |
503 | ␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
504 | ␉␉// I'll just leave it to verify the binary stucture.␊ |
505 | ␉␉␊ |
506 | ␉␉// NOTE: the cpumodel_familt data is not set in _cpuid_set_info␊ |
507 | ␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
508 | ␉␉// we set now.␊ |
509 | ␉␉␊ |
510 | ␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
511 | ␉␉{␊ |
512 | ␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
513 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
514 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
515 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
516 | ␉␉␉// Remove jump␊ |
517 | ␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
518 | ␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
519 | ␉␉␉␊ |
520 | ␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
521 | ␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
522 | ␉␉␉␊ |
523 | ␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
524 | ␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
525 | ␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
526 | ␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
527 | ␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
528 | ␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
529 | ␉␉␉␊ |
530 | ␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
531 | ␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
532 | ␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
533 | ␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
534 | ␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
535 | ␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
536 | ␊ |
537 | ␉␉␉patchLocation = jumpLocation;␊ |
538 | ␉␉␉// We now have 14 bytes available for a patch␊ |
539 | ␉␉}␊ |
540 | ␉␉else ␊ |
541 | ␉␉{␊ |
542 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
543 | ␉␉}␊ |
544 | ␉}␊ |
545 | ␉else ␊ |
546 | ␉{␊ |
547 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
548 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
549 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
550 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
551 | ␉}␊ |
552 | }␊ |
553 | ␊ |
554 | /**␊ |
555 | ** SleepEnabler.kext replacement (for those that need it)␊ |
556 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
557 | **/␊ |
558 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
559 | {␊ |
560 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
561 | ␊ |
562 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
563 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
564 | ␉␊ |
565 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
566 | ␉{␊ |
567 | ␉␉printf("Unable to locate _pmCPUExitHaltToOff\n");␊ |
568 | ␉␉return;␊ |
569 | ␉}␊ |
570 | ␉␊ |
571 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
572 | ␊ |
573 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
574 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
575 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
576 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
577 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
578 | ␊ |
579 | ␉{␊ |
580 | ␉␉patchLocation++;␊ |
581 | ␉}␊ |
582 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
583 | }␊ |
584 | ␊ |
585 | void patch_lapic_init(void* kernelData)␊ |
586 | {␊ |
587 | ␉UInt8 panicIndex = 0;␊ |
588 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
589 | ␉␊ |
590 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
591 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
592 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
593 | ␉{␊ |
594 | ␉␉printf("Unable to locate %s\n", "_lapic_init");␊ |
595 | ␉␉return;␊ |
596 | ␉}␊ |
597 | ␉␊ |
598 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
599 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
600 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
601 | ␉{␊ |
602 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
603 | ␉␉return;␊ |
604 | ␉}␊ |
605 | ␉␊ |
606 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
607 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
608 | ␊ |
609 | ␉// Locate the (panicIndex + 1) panic call␊ |
610 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
611 | ␉{␊ |
612 | ␉␉while( ␊ |
613 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
614 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
615 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
616 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
617 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
618 | ␉␉␉ )␊ |
619 | ␉␉{␊ |
620 | ␉␉␉patchLocation++;␊ |
621 | ␉␉}␊ |
622 | ␉␉patchLocation++;␊ |
623 | ␉␉panicIndex++;␊ |
624 | ␉}␊ |
625 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
626 | ␉␊ |
627 | ␉bytes[--patchLocation] = 0x90;␉␊ |
628 | ␉bytes[++patchLocation] = 0x90;␊ |
629 | ␉bytes[++patchLocation] = 0x90;␊ |
630 | ␉bytes[++patchLocation] = 0x90;␊ |
631 | ␉bytes[++patchLocation] = 0x90;␊ |
632 | }␊ |
633 | ␊ |
634 | void patch_commpage_stuff_routine(void* kernelData)␊ |
635 | {␊ |
636 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
637 | ␊ |
638 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
639 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
640 | ␉{␊ |
641 | ␉␉//printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
642 | ␉␉return;␊ |
643 | ␉␉␊ |
644 | ␉}␊ |
645 | ␉␊ |
646 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
647 | ␊ |
648 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
649 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
650 | ␉{␊ |
651 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
652 | ␉␉return;␊ |
653 | ␉}␊ |
654 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
655 | ␊ |
656 | ␉patchLocation -= (UInt32)kernelData;␊ |
657 | ␉panicAddr -= (UInt32)kernelData;␊ |
658 | ␉␊ |
659 | ␉while( ␊ |
660 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
661 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
662 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
663 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
664 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
665 | ␉␉ )␊ |
666 | ␉{␊ |
667 | ␉␉patchLocation++;␊ |
668 | ␉}␊ |
669 | ␉patchLocation--;␊ |
670 | ␉␊ |
671 | ␉// Replace panic with nops␊ |
672 | ␉bytes[patchLocation + 0] = 0x90;␊ |
673 | ␉bytes[patchLocation + 1] = 0x90;␊ |
674 | ␉bytes[patchLocation + 2] = 0x90;␊ |
675 | ␉bytes[patchLocation + 3] = 0x90;␊ |
676 | ␉bytes[patchLocation + 4] = 0x90;␊ |
677 | }␊ |
678 | ␊ |
679 | void patch_lapic_interrupt(void* kernelData)␊ |
680 | {␊ |
681 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
682 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
683 | ␊ |
684 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
685 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
686 | ␉{␊ |
687 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt");␊ |
688 | ␉␉return;␊ |
689 | ␉}␊ |
690 | ␊ |
691 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
692 | ␊ |
693 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
694 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
695 | ␉{␊ |
696 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
697 | ␉␉return;␊ |
698 | ␉}␊ |
699 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
700 | ␉␊ |
701 | ␉patchLocation -= (UInt32)kernelData;␊ |
702 | ␉panicAddr -= (UInt32)kernelData;␊ |
703 | ␉␊ |
704 | ␉while( ␊ |
705 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
706 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
707 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
708 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
709 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
710 | ␉␉ )␊ |
711 | ␉{␊ |
712 | ␉␉patchLocation++;␊ |
713 | ␉}␊ |
714 | ␉patchLocation--;␊ |
715 | ␉␊ |
716 | ␉// Replace panic with nops␊ |
717 | ␉bytes[patchLocation + 0] = 0x90;␊ |
718 | ␉bytes[patchLocation + 1] = 0x90;␊ |
719 | ␉bytes[patchLocation + 2] = 0x90;␊ |
720 | ␉bytes[patchLocation + 3] = 0x90;␊ |
721 | ␉bytes[patchLocation + 4] = 0x90;␊ |
722 | }␊ |
723 | ␊ |
724 | void patch_lapic_configure(void* kernelData)␊ |
725 | {␊ |
726 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
727 | ␉␊ |
728 | ␉UInt32 patchLocation;␊ |
729 | ␉UInt32 lapicStart;␊ |
730 | ␉UInt32 lapicInterruptBase;␊ |
731 | ␉␊ |
732 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
733 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
734 | ␉{␊ |
735 | ␉␉printf("Unable to locate %s\n", "_lapic_configure");␊ |
736 | ␉␉return;␊ |
737 | ␉}␊ |
738 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
739 | ␉␊ |
740 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
741 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
742 | ␉{␊ |
743 | ␉␉printf("Unable to locate %s\n", "_lapic_start");␊ |
744 | ␉␉return;␊ |
745 | ␉}␊ |
746 | ␉lapicStart = symbol->addr; ␊ |
747 | ␊ |
748 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
749 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
750 | ␉{␊ |
751 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
752 | ␉␉return;␊ |
753 | ␉}␊ |
754 | ␉lapicInterruptBase = symbol->addr;␊ |
755 | ␉patchLocation -= (UInt32)kernelData;␊ |
756 | ␉lapicStart -= (UInt32)kernelData;␊ |
757 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
758 | ␉␊ |
759 | ␉// Looking for the following:␊ |
760 | ␉//movl _lapic_start,%e_x␊ |
761 | ␉//addl $0x00000320,%e_x␊ |
762 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
763 | ␉while( ␊ |
764 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
765 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
766 | ␉␉ ( lapicStart != (UInt32)(␊ |
767 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
768 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
769 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
770 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
771 | ␉␉␉␉␉␉␉␉␉)␊ |
772 | ␉␉␉␉␉␉␉␉ )␊ |
773 | ␉␉ ) || ␊ |
774 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
775 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
776 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
777 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
778 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
779 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
780 | ␊ |
781 | ␉␉ )␊ |
782 | ␉{␊ |
783 | ␉␉patchLocation++;␊ |
784 | ␉}␊ |
785 | ␉patchLocation-=2;␊ |
786 | ␊ |
787 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
788 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
789 | ␉␊ |
790 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
791 | ␉/*␊ |
792 | ␉bytes[patchLocation++] = 0x8B;␊ |
793 | ␉bytes[patchLocation++] = 0x15;␊ |
794 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
795 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
796 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
797 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
798 | ␉*/␊ |
799 | ␉patchLocation += 6;␊ |
800 | ␉␊ |
801 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
802 | ␉/*␊ |
803 | ␉bytes[patchLocation++] = 0x81;␊ |
804 | ␉bytes[patchLocation++] = 0xC2;␊ |
805 | ␉*/␊ |
806 | ␉patchLocation += 2;␊ |
807 | ␉bytes[patchLocation++] = 0x60;␊ |
808 | ␉/*␊ |
809 | ␉bytes[patchLocation++];// = 0x03;␊ |
810 | ␉bytes[patchLocation++];// = 0x00;␊ |
811 | ␉bytes[patchLocation++];// = 0x00;␊ |
812 | ␉*/␊ |
813 | ␉patchLocation += 3;␊ |
814 | ␊ |
815 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
816 | ␉bytes[patchLocation++] = 0xC7;␊ |
817 | ␉bytes[patchLocation++] = 0x02;␊ |
818 | ␉bytes[patchLocation++] = 0x00;␊ |
819 | ␉bytes[patchLocation++] = 0x04;␊ |
820 | ␉bytes[patchLocation++] = 0x00;␊ |
821 | ␉bytes[patchLocation++] = 0x00;␊ |
822 | ␉␊ |
823 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
824 | ␉bytes[patchLocation++] = 0x83;␊ |
825 | ␉bytes[patchLocation++] = 0xEA;␊ |
826 | ␉bytes[patchLocation++] = 0x40;␊ |
827 | ␊ |
828 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
829 | ␉bytes[patchLocation++] = 0xA1;␊ |
830 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
831 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
832 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
833 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
834 | ␊ |
835 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
836 | ␉bytes[patchLocation++] = 0x83;␊ |
837 | ␉bytes[patchLocation++] = 0xC0;␊ |
838 | ␉bytes[patchLocation++] = 0x0E;␊ |
839 | ␊ |
840 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
841 | ␉bytes[patchLocation++] = 0x89;␊ |
842 | ␉bytes[patchLocation++] = 0x02;␊ |
843 | ␉␊ |
844 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
845 | ␉bytes[patchLocation++] = 0x81;␊ |
846 | ␉bytes[patchLocation++] = 0xC2;␊ |
847 | ␉bytes[patchLocation++] = 0x30;␊ |
848 | ␉bytes[patchLocation++] = 0x03;␊ |
849 | ␉bytes[patchLocation++] = 0x00;␊ |
850 | ␉bytes[patchLocation++] = 0x00;␊ |
851 | ␉␊ |
852 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
853 | ␉bytes[patchLocation++] = 0xA1;␊ |
854 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
855 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
856 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
857 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
858 | ␉␊ |
859 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
860 | ␉bytes[patchLocation++] = 0x83;␊ |
861 | ␉bytes[patchLocation++] = 0xC0;␊ |
862 | ␉bytes[patchLocation++] = 0x0F;␊ |
863 | ␉␊ |
864 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
865 | ␉bytes[patchLocation++] = 0x89;␊ |
866 | ␉bytes[patchLocation++] = 0x02;␊ |
867 | ␉␊ |
868 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
869 | ␉bytes[patchLocation++] = 0x83;␊ |
870 | ␉bytes[patchLocation++] = 0xEA;␊ |
871 | ␉bytes[patchLocation++] = 0x10;␊ |
872 | ␊ |
873 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
874 | ␉bytes[patchLocation++] = 0xA1;␊ |
875 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
876 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
877 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
878 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
879 | ␉␊ |
880 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
881 | ␉bytes[patchLocation++] = 0x83;␊ |
882 | ␉bytes[patchLocation++] = 0xC0;␊ |
883 | ␉bytes[patchLocation++] = 0x0C;␊ |
884 | ␊ |
885 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
886 | ␉bytes[patchLocation++] = 0x89;␊ |
887 | ␉bytes[patchLocation++] = 0x02;␊ |
888 | ␊ |
889 | ␉// Replace remaining with nops␊ |
890 | ␊ |
891 | ␉bytes[patchLocation++] = 0x90;␊ |
892 | ␉bytes[patchLocation++] = 0x90;␊ |
893 | ␉bytes[patchLocation++] = 0x90;␊ |
894 | ␉bytes[patchLocation++] = 0x90;␊ |
895 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
896 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
897 | }␊ |
898 | |