1 | ␉/*␊ |
2 | * Copyright (c) 2009-2010 Evan Lojewski. All rights reserved.␊ |
3 | *␊ |
4 | */␊ |
5 | ␊ |
6 | //#include "libsaio.h"␊ |
7 | #include "saio_types.h"␊ |
8 | //---␊ |
9 | #include "kernel_patcher.h"␊ |
10 | #include "platform.h"␊ |
11 | #include "modules.h"␊ |
12 | ␊ |
13 | extern PlatformInfo_t Platform;␊ |
14 | ␊ |
15 | patchRoutine_t* patches = NULL;␊ |
16 | kernSymbols_t* kernelSymbols = NULL;␊ |
17 | ␊ |
18 | ␊ |
19 | void KernelPatcher_start()␊ |
20 | {␊ |
21 | ␉//register_kernel_patch(patch_cpuid_set_info, KERNEL_32, CPUID_MODEL_ATOM);␉␉// TODO: CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN␊ |
22 | ␉//register_kernel_patch(patch_cpuid_set_info, KERNEL_32, CPUID_MODEL_UNKNOWN);␉// 0, 0 ␊ |
23 | ␉register_kernel_patch(patch_cpuid_set_info_all, KERNEL_ANY, CPUID_MODEL_UNKNOWN); ␊ |
24 | ␊ |
25 | ␉register_kernel_patch(patch_commpage_stuff_routine, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
26 | ␉␊ |
27 | ␉register_kernel_patch(patch_lapic_init, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
28 | ␊ |
29 | ␉// NOTE: following is currently 32bit only␊ |
30 | ␉register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊ |
31 | ␊ |
32 | ␉␊ |
33 | ␉register_kernel_symbol(KERNEL_ANY, "_panic");␊ |
34 | ␉register_kernel_symbol(KERNEL_ANY, "_cpuid_set_info");␊ |
35 | ␉register_kernel_symbol(KERNEL_ANY, "_pmCPUExitHaltToOff");␊ |
36 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_init");␊ |
37 | ␉register_kernel_symbol(KERNEL_ANY, "_commpage_stuff_routine");␊ |
38 | ␊ |
39 | ␉// LAPIC configure symbols␊ |
40 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_configure");␊ |
41 | ␊ |
42 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_start");␊ |
43 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt_base");␊ |
44 | ␉␊ |
45 | ␉␊ |
46 | ␉//register_kernel_patch(patch_lapic_interrupt, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
47 | ␉//register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt");␊ |
48 | ␊ |
49 | ␊ |
50 | ␉␊ |
51 | ␉// TODO: register needed symbols␊ |
52 | ␉␊ |
53 | ␉␊ |
54 | ␉register_hook_callback("ExecKernel", &patch_kernel); ␊ |
55 | }␊ |
56 | ␊ |
57 | /*␊ |
58 | * Register a kerenl patch␊ |
59 | */␊ |
60 | void register_kernel_patch(void* patch, int arch, int cpus)␊ |
61 | {␊ |
62 | ␉// TODO: only insert valid patches based on current cpuid and architecture␊ |
63 | ␉// AKA, don't at 64bit patches if it's a 32bit only machine␊ |
64 | ␉patchRoutine_t* entry;␊ |
65 | ␉␊ |
66 | ␉// TODO: verify Platform.CPU.Model is populated this early in bootup␊ |
67 | ␉// Check to ensure that the patch is valid on this machine␊ |
68 | ␉// If it is not, exit early form this function␊ |
69 | ␉if(cpus != Platform.CPU.Model)␊ |
70 | ␉{␊ |
71 | ␉␉if(cpus != CPUID_MODEL_ANY)␊ |
72 | ␉␉{␊ |
73 | ␉␉␉if(cpus == CPUID_MODEL_UNKNOWN)␊ |
74 | ␉␉␉{␊ |
75 | ␉␉␉␉switch(Platform.CPU.Model)␊ |
76 | ␉␉␉␉{␊ |
77 | ␉␉␉␉␉case 13:␊ |
78 | ␉␉␉␉␉case CPUID_MODEL_YONAH:␊ |
79 | ␉␉␉␉␉case CPUID_MODEL_MEROM:␊ |
80 | ␉␉␉␉␉case CPUID_MODEL_PENRYN:␊ |
81 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM:␊ |
82 | ␉␉␉␉␉case CPUID_MODEL_FIELDS:␊ |
83 | ␉␉␉␉␉case CPUID_MODEL_DALES:␊ |
84 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM_EX:␊ |
85 | ␉␉␉␉␉␉// Known cpu's we don't want to add the patch␊ |
86 | ␉␉␉␉␉␉return;␊ |
87 | ␉␉␉␉␉␉break;␊ |
88 | ␊ |
89 | ␉␉␉␉␉default:␊ |
90 | ␉␉␉␉␉␉// CPU not in supported list, so we are going to add␊ |
91 | ␉␉␉␉␉␉// The patch will be applied␊ |
92 | ␉␉␉␉␉␉break;␊ |
93 | ␉␉␉␉␉␉␊ |
94 | ␉␉␉␉}␊ |
95 | ␉␉␉}␊ |
96 | ␉␉␉else␊ |
97 | ␉␉␉{␊ |
98 | ␉␉␉␉// Invalid cpuid for current cpu. Ignoring patch␊ |
99 | ␉␉␉␉return;␊ |
100 | ␉␉␉}␊ |
101 | ␊ |
102 | ␉␉}␊ |
103 | ␉}␊ |
104 | ␉␉␊ |
105 | ␉if(patches == NULL)␊ |
106 | ␉{␊ |
107 | ␉␉patches = entry = malloc(sizeof(patchRoutine_t));␊ |
108 | ␉}␊ |
109 | ␉else␊ |
110 | ␉{␊ |
111 | ␉␉entry = patches;␊ |
112 | ␉␉while(entry->next)␊ |
113 | ␉␉{␊ |
114 | ␉␉␉entry = entry->next;␊ |
115 | ␉␉}␊ |
116 | ␉␉␊ |
117 | ␉␉entry->next = malloc(sizeof(patchRoutine_t));␊ |
118 | ␉␉entry = entry->next;␊ |
119 | ␉}␊ |
120 | ␉␊ |
121 | ␉entry->next = NULL;␊ |
122 | ␉entry->patchRoutine = patch;␊ |
123 | ␉entry->validArchs = arch;␊ |
124 | ␉entry->validCpu = cpus;␊ |
125 | }␊ |
126 | ␊ |
127 | void register_kernel_symbol(int kernelType, const char* name)␊ |
128 | {␊ |
129 | ␉if(kernelSymbols == NULL)␊ |
130 | ␉{␊ |
131 | ␉␉kernelSymbols = malloc(sizeof(kernSymbols_t));␊ |
132 | ␉␉kernelSymbols->next = NULL;␊ |
133 | ␉␉kernelSymbols->symbol = (char*)name;␊ |
134 | ␉␉kernelSymbols->addr = 0;␊ |
135 | ␉}␊ |
136 | ␉else {␊ |
137 | ␉␉kernSymbols_t *symbol = kernelSymbols;␊ |
138 | ␉␉while(symbol->next != NULL)␊ |
139 | ␉␉{␊ |
140 | ␉␉␉symbol = symbol->next;␊ |
141 | ␉␉}␊ |
142 | ␉␉␊ |
143 | ␉␉symbol->next = malloc(sizeof(kernSymbols_t));␊ |
144 | ␉␉symbol = symbol->next;␊ |
145 | ␊ |
146 | ␉␉symbol->next = NULL;␊ |
147 | ␉␉symbol->symbol = (char*)name;␊ |
148 | ␉␉symbol->addr = 0;␊ |
149 | ␉}␊ |
150 | }␊ |
151 | ␊ |
152 | kernSymbols_t* lookup_kernel_symbol(const char* name)␊ |
153 | {␊ |
154 | ␉kernSymbols_t *symbol = kernelSymbols;␊ |
155 | ␊ |
156 | ␉while(symbol && strcmp(symbol->symbol, name) !=0)␊ |
157 | ␉{␊ |
158 | ␉␉symbol = symbol->next;␊ |
159 | ␉}␊ |
160 | ␉␊ |
161 | ␉if(!symbol)␊ |
162 | ␉{␊ |
163 | ␉␉return NULL;␊ |
164 | ␉}␊ |
165 | ␉else␊ |
166 | ␉{␊ |
167 | ␉␉return symbol;␊ |
168 | ␉}␊ |
169 | ␊ |
170 | }␊ |
171 | ␊ |
172 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4)␊ |
173 | {␊ |
174 | ␉patchRoutine_t* entry = patches;␊ |
175 | ␊ |
176 | ␉␊ |
177 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
178 | ␊ |
179 | ␉locate_symbols(kernelData);␊ |
180 | ␉␊ |
181 | ␉if(patches != NULL)␊ |
182 | ␉{␊ |
183 | ␉␉while(entry)␊ |
184 | ␉␉{␊ |
185 | ␉␉␉if(entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
186 | ␉␉␉{␊ |
187 | ␉␉␉␉if(entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
188 | ␉␉␉}␊ |
189 | ␉␉␉entry = entry->next;␊ |
190 | ␉␉}␊ |
191 | ␉␉␊ |
192 | ␉}␊ |
193 | }␊ |
194 | ␊ |
195 | int determineKernelArchitecture(void* kernelData)␊ |
196 | {␉␊ |
197 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
198 | ␉{␊ |
199 | ␉␉return KERNEL_32;␊ |
200 | ␉}␊ |
201 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
202 | ␉{␊ |
203 | ␉␉return KERNEL_64;␊ |
204 | ␉}␊ |
205 | ␉else␊ |
206 | ␉{␊ |
207 | ␉␉return KERNEL_ERR;␊ |
208 | ␉}␊ |
209 | }␊ |
210 | ␊ |
211 | ␊ |
212 | /**␊ |
213 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
214 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
215 | **/␊ |
216 | int locate_symbols(void* kernelData)␊ |
217 | {␊ |
218 | ␉char is64 = 1;␊ |
219 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
220 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
221 | ␉return 1 << is64;␊ |
222 | }␊ |
223 | ␊ |
224 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
225 | {␊ |
226 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
227 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
228 | ␉␊ |
229 | ␉␊ |
230 | ␉␊ |
231 | ␉if(symbol)␊ |
232 | ␉{␊ |
233 | ␊ |
234 | ␉␉//printf("Located %sbit symbol %s at 0x%lX\n", is64 ? "64" : "32", symbolName, addr);␊ |
235 | ␉␉//getc();␊ |
236 | ␉␉␊ |
237 | ␉␉symbol->addr = addr;␊ |
238 | ␉}␊ |
239 | ␉return 0xFFFFFFFF; // fixme␊ |
240 | }␊ |
241 | ␊ |
242 | ␊ |
243 | /**␊ |
244 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
245 | ** Or replace it so that the cpuid is set to a valid value.␊ |
246 | **/␊ |
247 | void patch_cpuid_set_info_all(void* kernelData)␊ |
248 | {␊ |
249 | ␉switch(Platform.CPU.Model)␊ |
250 | ␉{␊ |
251 | ␉␉case CPUID_MODEL_ATOM:␊ |
252 | ␉␉␉patch_cpuid_set_info(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
253 | ␉␉␉break;␊ |
254 | ␉␉␉␊ |
255 | ␉␉default:␊ |
256 | ␉␉␉patch_cpuid_set_info(kernelData, 0, 0);␊ |
257 | ␉␉␉break;␊ |
258 | ␉}␊ |
259 | }␊ |
260 | ␊ |
261 | void patch_cpuid_set_info(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
262 | {␊ |
263 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
264 | ␉␊ |
265 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
266 | ␊ |
267 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
268 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
269 | ␉␊ |
270 | ␉␊ |
271 | ␊ |
272 | ␉UInt32 jumpLocation = 0;␊ |
273 | ␉␊ |
274 | ␉␊ |
275 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
276 | ␉{␊ |
277 | ␉␉printf("Unable to locate _cpuid_set_info\n");␊ |
278 | ␉␉return;␊ |
279 | ␉␉␊ |
280 | ␉}␊ |
281 | ␊ |
282 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
283 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
284 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
285 | ␉{␊ |
286 | ␉␉printf("Unable to locate _panic\n");␊ |
287 | ␉␉return;␊ |
288 | ␉}␊ |
289 | ␉panicAddr -= (UInt32)kernelData;␊ |
290 | ␊ |
291 | ␉␊ |
292 | ␉␊ |
293 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
294 | ␉while( ␊ |
295 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
296 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
297 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
298 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
299 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
300 | ␉␉ )␊ |
301 | ␉{␊ |
302 | ␉␉patchLocation++;␊ |
303 | ␉}␊ |
304 | ␉patchLocation--;␊ |
305 | ␉␊ |
306 | ␉printf("0x%X 0x%X 0x%X 0x%X 0x%X\n", bytes[patchLocation ], bytes[patchLocation +1], bytes[patchLocation +2], bytes[patchLocation +3], bytes[patchLocation +4]);␊ |
307 | ␉␊ |
308 | ␉// Remove panic call, just in case the following patch routines fail␊ |
309 | ␉bytes[patchLocation + 0] = 0x90;␊ |
310 | ␉bytes[patchLocation + 1] = 0x90;␊ |
311 | ␉bytes[patchLocation + 2] = 0x90;␊ |
312 | ␉bytes[patchLocation + 3] = 0x90;␊ |
313 | ␉bytes[patchLocation + 4] = 0x90;␊ |
314 | ␉printf("0x%X 0x%X 0x%X 0x%X 0x%X\n", bytes[patchLocation ], bytes[patchLocation +1], bytes[patchLocation +2], bytes[patchLocation +3], bytes[patchLocation +4]);␊ |
315 | ␊ |
316 | ␉getc();␊ |
317 | ␉␊ |
318 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
319 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
320 | ␉// NOTE: This will work on a *32* bit kernel and *not* on a 64 bit ont␊ |
321 | ␉jumpLocation = patchLocation - 15;␊ |
322 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
323 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -8)) &&␊ |
324 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
325 | ␉{␊ |
326 | ␉␉jumpLocation--;␊ |
327 | ␉}␊ |
328 | ␉␊ |
329 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
330 | ␉if(impersonateFamily &&␊ |
331 | ␉ impersonateModel &&␊ |
332 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
333 | ␉{␊ |
334 | ␉␉␊ |
335 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
336 | ␉␉␊ |
337 | ␉␉/* ␊ |
338 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
339 | ␉␉ */␊ |
340 | ␊ |
341 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
342 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
343 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
344 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 8 |␊ |
345 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 13] << 16 |␊ |
346 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 12] << 24;␊ |
347 | ␉␉␊ |
348 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
349 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 299; ␊ |
350 | ␉␉␊ |
351 | ␉␉␊ |
352 | ␉␉// cpufamily = CPUFAMILY_INTEL_PENRYN␊ |
353 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
354 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
355 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
356 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
357 | ␉␉␊ |
358 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
359 | ␉␉// nop and continue with the rest of the patch␊ |
360 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
361 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
362 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
363 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
364 | ␉␉␊ |
365 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
366 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
367 | ␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
368 | ␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
369 | ␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
370 | ␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
371 | ␉␉␊ |
372 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
373 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
374 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
375 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
376 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
377 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
378 | ␉␉␊ |
379 | ␉}␊ |
380 | ␉else if(impersonateFamily && impersonateModel)␊ |
381 | ␉{␊ |
382 | ␉␉// Eitehr a 64bit kernel *or* a pre 10.6.2 kernel␊ |
383 | ␉␉// Look for ␊ |
384 | ␉␉jumpLocation = patchLocation - 15;␊ |
385 | ␉␉while((bytes[jumpLocation - 2] != 0x0F ||␊ |
386 | ␉␉␉ bytes[jumpLocation - 1] != 0x87 ||␊ |
387 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -31)) &&␊ |
388 | ␉␉␉ (patchLocation - jumpLocation) < 0x200)␊ |
389 | ␉␉{␊ |
390 | ␉␉␉jumpLocation--;␊ |
391 | ␉␉}␊ |
392 | ␉␉␊ |
393 | ␉␉␊ |
394 | ␉␉if((patchLocation - jumpLocation) < 0x200)␊ |
395 | ␉␉{␊ |
396 | ␉␉␉// 64 bit kernel, 10.6.2+␊ |
397 | ␉␉}␊ |
398 | ␉␉else␊ |
399 | ␉␉{␉// 32 bit kernel␊ |
400 | ␉␉␊ |
401 | ␉␉␉// pre 10.6.2 kernel␊ |
402 | ␉␉␉// Locate the jump to directly *after* the panic call,␊ |
403 | ␉␉␉jumpLocation = patchLocation - 4;␊ |
404 | ␉␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
405 | ␉␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
406 | ␉␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
407 | ␉␉␉{␊ |
408 | ␉␉␉␉jumpLocation--;␊ |
409 | ␉␉␉}␊ |
410 | ␉␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
411 | ␉␉␉// I'll just leave it to verify the binary stucture.␊ |
412 | ␉␉␉␊ |
413 | ␉␉␉// NOTE: the cpumodel_family data is not set in _cpuid_set_info␊ |
414 | ␉␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
415 | ␉␉␉// we set now.␊ |
416 | ␉␉␉␊ |
417 | ␉␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
418 | ␉␉␉{␊ |
419 | ␉␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
420 | ␉␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
421 | ␉␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
422 | ␉␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
423 | ␉␉␉␉// Remove jump␊ |
424 | ␉␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
425 | ␉␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
426 | ␉␉␉␉␊ |
427 | ␉␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
428 | ␉␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
429 | ␉␉␉␉␊ |
430 | ␉␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
431 | ␉␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
432 | ␉␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
433 | ␉␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
434 | ␉␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
435 | ␉␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
436 | ␉␉␉␉␊ |
437 | ␉␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
438 | ␉␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
439 | ␉␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
440 | ␉␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
441 | ␉␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
442 | ␉␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
443 | ␉␉␉␉␊ |
444 | ␉␉␉␉␊ |
445 | ␉␉␉␉␊ |
446 | ␉␉␉␉patchLocation = jumpLocation;␊ |
447 | ␉␉␉␉// We now have 14 bytes available for a patch␊ |
448 | ␉␉␉␉␊ |
449 | ␉␉␉}␊ |
450 | ␉␉}␊ |
451 | ␉␉/*else ␊ |
452 | ␉␉{␊ |
453 | ␉␉␉// Check for 64bit kernel.␊ |
454 | ␉␉␉␊ |
455 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
456 | ␉␉}*/␊ |
457 | ␉}␊ |
458 | ␉else ␊ |
459 | ␉{␊ |
460 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
461 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
462 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
463 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
464 | ␉}␊ |
465 | }␊ |
466 | ␊ |
467 | ␊ |
468 | /**␊ |
469 | ** SleepEnabler.kext replacement (for those that need it)␊ |
470 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
471 | **/␊ |
472 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
473 | {␊ |
474 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
475 | ␊ |
476 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
477 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
478 | ␉␊ |
479 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
480 | ␉{␊ |
481 | ␉␉printf("Unable to locate _pmCPUExitHaltToOff\n");␊ |
482 | ␉␉return;␊ |
483 | ␉}␊ |
484 | ␉␊ |
485 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
486 | ␉␊ |
487 | ␉␊ |
488 | ␉␊ |
489 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
490 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
491 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
492 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
493 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
494 | ␊ |
495 | ␉{␊ |
496 | ␉␉patchLocation++;␊ |
497 | ␉}␊ |
498 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
499 | }␊ |
500 | ␊ |
501 | void patch_lapic_init(void* kernelData)␊ |
502 | {␊ |
503 | ␊ |
504 | ␉UInt8 panicIndex = 0;␊ |
505 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
506 | ␉␊ |
507 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
508 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
509 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
510 | ␉{␊ |
511 | ␉␉printf("Unable to locate %s\n", "_lapic_init");␊ |
512 | ␉␉return;␊ |
513 | ␉␉␊ |
514 | ␉}␊ |
515 | ␉␊ |
516 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
517 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
518 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
519 | ␉{␊ |
520 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
521 | ␉␉return;␊ |
522 | ␉}␊ |
523 | ␉␊ |
524 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
525 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
526 | ␊ |
527 | ␉␊ |
528 | ␉␊ |
529 | ␉␊ |
530 | ␉// Locate the (panicIndex + 1) panic call␊ |
531 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
532 | ␉{␊ |
533 | ␉␉while( ␊ |
534 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
535 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
536 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
537 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
538 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
539 | ␉␉␉ )␊ |
540 | ␉␉{␊ |
541 | ␉␉␉patchLocation++;␊ |
542 | ␉␉}␊ |
543 | ␉␉patchLocation++;␊ |
544 | ␉␉panicIndex++;␊ |
545 | ␉}␊ |
546 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
547 | ␉␊ |
548 | ␉bytes[--patchLocation] = 0x90;␉␊ |
549 | ␉bytes[++patchLocation] = 0x90;␊ |
550 | ␉bytes[++patchLocation] = 0x90;␊ |
551 | ␉bytes[++patchLocation] = 0x90;␊ |
552 | ␉bytes[++patchLocation] = 0x90;␊ |
553 | ␉␊ |
554 | ␉␊ |
555 | }␊ |
556 | ␊ |
557 | ␊ |
558 | void patch_commpage_stuff_routine(void* kernelData)␊ |
559 | {␊ |
560 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
561 | ␊ |
562 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
563 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
564 | ␉{␊ |
565 | ␉␉printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
566 | ␉␉return;␊ |
567 | ␉␉␊ |
568 | ␉}␊ |
569 | ␉␊ |
570 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
571 | ␊ |
572 | ␉␊ |
573 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
574 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
575 | ␉{␊ |
576 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
577 | ␉␉return;␊ |
578 | ␉}␊ |
579 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
580 | ␊ |
581 | ␉patchLocation -= (UInt32)kernelData;␊ |
582 | ␉panicAddr -= (UInt32)kernelData;␊ |
583 | ␉␊ |
584 | ␉while( ␊ |
585 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
586 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
587 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
588 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
589 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
590 | ␉␉ )␊ |
591 | ␉{␊ |
592 | ␉␉patchLocation++;␊ |
593 | ␉}␊ |
594 | ␉patchLocation--;␊ |
595 | ␉␊ |
596 | ␉// Replace panic with nops␊ |
597 | ␉bytes[patchLocation + 0] = 0x90;␊ |
598 | ␉bytes[patchLocation + 1] = 0x90;␊ |
599 | ␉bytes[patchLocation + 2] = 0x90;␊ |
600 | ␉bytes[patchLocation + 3] = 0x90;␊ |
601 | ␉bytes[patchLocation + 4] = 0x90;␊ |
602 | ␉␊ |
603 | ␉␊ |
604 | }␊ |
605 | ␊ |
606 | void patch_lapic_interrupt(void* kernelData)␊ |
607 | {␊ |
608 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
609 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
610 | ␉␊ |
611 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
612 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
613 | ␉{␊ |
614 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt");␊ |
615 | ␉␉return;␊ |
616 | ␉␉␊ |
617 | ␉}␊ |
618 | ␉␊ |
619 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
620 | ␉␊ |
621 | ␉␊ |
622 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
623 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
624 | ␉{␊ |
625 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
626 | ␉␉return;␊ |
627 | ␉}␊ |
628 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
629 | ␉␊ |
630 | ␉patchLocation -= (UInt32)kernelData;␊ |
631 | ␉panicAddr -= (UInt32)kernelData;␊ |
632 | ␉␊ |
633 | ␉while( ␊ |
634 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
635 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
636 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
637 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
638 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
639 | ␉␉ )␊ |
640 | ␉{␊ |
641 | ␉␉patchLocation++;␊ |
642 | ␉}␊ |
643 | ␉patchLocation--;␊ |
644 | ␉␊ |
645 | ␉// Replace panic with nops␊ |
646 | ␉bytes[patchLocation + 0] = 0x90;␊ |
647 | ␉bytes[patchLocation + 1] = 0x90;␊ |
648 | ␉bytes[patchLocation + 2] = 0x90;␊ |
649 | ␉bytes[patchLocation + 3] = 0x90;␊ |
650 | ␉bytes[patchLocation + 4] = 0x90;␊ |
651 | ␉␊ |
652 | ␉␊ |
653 | }␊ |
654 | ␊ |
655 | ␊ |
656 | void patch_lapic_configure(void* kernelData)␊ |
657 | {␊ |
658 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
659 | ␉␊ |
660 | ␉UInt32 patchLocation;␊ |
661 | ␉UInt32 lapicStart;␊ |
662 | ␉UInt32 lapicInterruptBase;␊ |
663 | ␉␊ |
664 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
665 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
666 | ␉{␊ |
667 | ␉␉printf("Unable to locate %s\n", "_lapic_configure");␊ |
668 | ␉␉return;␊ |
669 | ␉}␊ |
670 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
671 | ␉␊ |
672 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
673 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
674 | ␉{␊ |
675 | ␉␉printf("Unable to locate %s\n", "_lapic_start");␊ |
676 | ␉␉return;␊ |
677 | ␉}␊ |
678 | ␉lapicStart = symbol->addr; ␊ |
679 | ␊ |
680 | ␊ |
681 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
682 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
683 | ␉{␊ |
684 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
685 | ␉␉return;␊ |
686 | ␉}␊ |
687 | ␉lapicInterruptBase = symbol->addr;␊ |
688 | ␉patchLocation -= (UInt32)kernelData;␊ |
689 | ␉lapicStart -= (UInt32)kernelData;␊ |
690 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
691 | ␉␊ |
692 | ␉␊ |
693 | ␉// Looking for the following:␊ |
694 | ␉//movl _lapic_start,%e_x␊ |
695 | ␉//addl $0x00000320,%e_x␊ |
696 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
697 | ␉while( ␊ |
698 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
699 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
700 | ␉␉ ( lapicStart != (UInt32)(␊ |
701 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
702 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
703 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
704 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
705 | ␉␉␉␉␉␉␉␉␉)␊ |
706 | ␉␉␉␉␉␉␉␉ )␊ |
707 | ␉␉ ) || ␊ |
708 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
709 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
710 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
711 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
712 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
713 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
714 | ␊ |
715 | ␉␉ )␊ |
716 | ␉{␊ |
717 | ␉␉patchLocation++;␊ |
718 | ␉}␊ |
719 | ␉patchLocation-=2;␊ |
720 | ␊ |
721 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
722 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
723 | ␉␊ |
724 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
725 | ␉/*␊ |
726 | ␉bytes[patchLocation++] = 0x8B;␊ |
727 | ␉bytes[patchLocation++] = 0x15;␊ |
728 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
729 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
730 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
731 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
732 | ␉*/␊ |
733 | ␉patchLocation += 6;␊ |
734 | ␉␊ |
735 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
736 | ␉/*␊ |
737 | ␉bytes[patchLocation++] = 0x81;␊ |
738 | ␉bytes[patchLocation++] = 0xC2;␊ |
739 | ␉*/␊ |
740 | ␉patchLocation += 2;␊ |
741 | ␉bytes[patchLocation++] = 0x60;␊ |
742 | ␉/*␊ |
743 | ␉bytes[patchLocation++];// = 0x03;␊ |
744 | ␉bytes[patchLocation++];// = 0x00;␊ |
745 | ␉bytes[patchLocation++];// = 0x00;␊ |
746 | ␉*/␊ |
747 | ␉ patchLocation += 3;␊ |
748 | ␊ |
749 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
750 | ␉bytes[patchLocation++] = 0xC7;␊ |
751 | ␉bytes[patchLocation++] = 0x02;␊ |
752 | ␉bytes[patchLocation++] = 0x00;␊ |
753 | ␉bytes[patchLocation++] = 0x04;␊ |
754 | ␉bytes[patchLocation++] = 0x00;␊ |
755 | ␉bytes[patchLocation++] = 0x00;␊ |
756 | ␉␊ |
757 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
758 | ␉bytes[patchLocation++] = 0x83;␊ |
759 | ␉bytes[patchLocation++] = 0xEA;␊ |
760 | ␉bytes[patchLocation++] = 0x40;␊ |
761 | ␊ |
762 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
763 | ␉bytes[patchLocation++] = 0xA1;␊ |
764 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
765 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
766 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
767 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
768 | ␊ |
769 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
770 | ␉bytes[patchLocation++] = 0x83;␊ |
771 | ␉bytes[patchLocation++] = 0xC0;␊ |
772 | ␉bytes[patchLocation++] = 0x0E;␊ |
773 | ␊ |
774 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
775 | ␉bytes[patchLocation++] = 0x89;␊ |
776 | ␉bytes[patchLocation++] = 0x02;␊ |
777 | ␉␊ |
778 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
779 | ␉bytes[patchLocation++] = 0x81;␊ |
780 | ␉bytes[patchLocation++] = 0xC2;␊ |
781 | ␉bytes[patchLocation++] = 0x30;␊ |
782 | ␉bytes[patchLocation++] = 0x03;␊ |
783 | ␉bytes[patchLocation++] = 0x00;␊ |
784 | ␉bytes[patchLocation++] = 0x00;␊ |
785 | ␉␊ |
786 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
787 | ␉bytes[patchLocation++] = 0xA1;␊ |
788 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
789 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
790 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
791 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
792 | ␉␊ |
793 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
794 | ␉bytes[patchLocation++] = 0x83;␊ |
795 | ␉bytes[patchLocation++] = 0xC0;␊ |
796 | ␉bytes[patchLocation++] = 0x0F;␊ |
797 | ␉␊ |
798 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
799 | ␉bytes[patchLocation++] = 0x89;␊ |
800 | ␉bytes[patchLocation++] = 0x02;␊ |
801 | ␉␊ |
802 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
803 | ␉bytes[patchLocation++] = 0x83;␊ |
804 | ␉bytes[patchLocation++] = 0xEA;␊ |
805 | ␉bytes[patchLocation++] = 0x10;␊ |
806 | ␊ |
807 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
808 | ␉bytes[patchLocation++] = 0xA1;␊ |
809 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
810 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
811 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
812 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
813 | ␉␊ |
814 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
815 | ␉bytes[patchLocation++] = 0x83;␊ |
816 | ␉bytes[patchLocation++] = 0xC0;␊ |
817 | ␉bytes[patchLocation++] = 0x0C;␊ |
818 | ␊ |
819 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
820 | ␉bytes[patchLocation++] = 0x89;␊ |
821 | ␉bytes[patchLocation++] = 0x02;␊ |
822 | ␊ |
823 | ␉// Replace remaining with nops␊ |
824 | ␊ |
825 | ␊ |
826 | ␉bytes[patchLocation++] = 0x90;␊ |
827 | ␉bytes[patchLocation++] = 0x90;␊ |
828 | ␉bytes[patchLocation++] = 0x90;␊ |
829 | ␉bytes[patchLocation++] = 0x90;␊ |
830 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
831 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
832 | }␊ |
833 | |