1 | ␉/*␊ |
2 | * Copyright (c) 2009-2010 Evan Lojewski. All rights reserved.␊ |
3 | *␊ |
4 | */␊ |
5 | ␊ |
6 | #include "boot.h"␊ |
7 | #include "bootstruct.h" // replaces libsaio.h.␊ |
8 | //#include "libsaio.h"␊ |
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 | ␉bool␉␉␉patchKernel = false; //Kpatcher - default value.␊ |
175 | ␉patchRoutine_t* entry = patches;␊ |
176 | ␊ |
177 | ␉// check if kernel patcher is requested by user.␊ |
178 | ␉getBoolForKey(kKPatcherKey, &patchKernel, &bootInfo->bootConfig);␊ |
179 | ␉␊ |
180 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
181 | ␊ |
182 | ␉locate_symbols(kernelData);␊ |
183 | ␉␊ |
184 | ␉if (patches != NULL && patchKernel)␊ |
185 | ␉{␊ |
186 | ␉␉while(entry)␊ |
187 | ␉␉{␊ |
188 | ␉␉␉if (entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
189 | ␉␉␉{␊ |
190 | ␉␉␉␉if (entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
191 | ␉␉␉}␊ |
192 | ␉␉␉entry = entry->next;␊ |
193 | ␉␉}␊ |
194 | ␉}␊ |
195 | }␊ |
196 | ␊ |
197 | int determineKernelArchitecture(void* kernelData)␊ |
198 | {␉␊ |
199 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
200 | ␉{␊ |
201 | ␉␉return KERNEL_32;␊ |
202 | ␉}␊ |
203 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
204 | ␉{␊ |
205 | ␉␉return KERNEL_64;␊ |
206 | ␉}␊ |
207 | ␉else␊ |
208 | ␉{␊ |
209 | ␉␉return KERNEL_ERR;␊ |
210 | ␉}␊ |
211 | }␊ |
212 | ␊ |
213 | ␊ |
214 | /**␊ |
215 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
216 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
217 | **/␊ |
218 | int locate_symbols(void* kernelData)␊ |
219 | {␊ |
220 | ␉char is64 = 1;␊ |
221 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
222 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
223 | ␉return 1 << is64;␊ |
224 | }␊ |
225 | ␊ |
226 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
227 | {␊ |
228 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
229 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
230 | ␉␊ |
231 | ␉␊ |
232 | ␉␊ |
233 | ␉if(symbol)␊ |
234 | ␉{␊ |
235 | ␊ |
236 | ␉␉//printf("Located %sbit symbol %s at 0x%lX\n", is64 ? "64" : "32", symbolName, addr);␊ |
237 | ␉␉//getc();␊ |
238 | ␉␉␊ |
239 | ␉␉symbol->addr = addr;␊ |
240 | ␉}␊ |
241 | ␉return 0xFFFFFFFF; // fixme␊ |
242 | }␊ |
243 | ␊ |
244 | ␊ |
245 | /**␊ |
246 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
247 | ** Or replace it so that the cpuid is set to a valid value.␊ |
248 | **/␊ |
249 | void patch_cpuid_set_info_all(void* kernelData)␊ |
250 | {␊ |
251 | ␉switch(Platform.CPU.Model)␊ |
252 | ␉{␊ |
253 | ␉␉case CPUID_MODEL_ATOM:␊ |
254 | ␉␉␉patch_cpuid_set_info(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
255 | ␉␉␉break;␊ |
256 | ␉␉␉␊ |
257 | ␉␉default:␊ |
258 | ␉␉␉patch_cpuid_set_info(kernelData, 0, 0);␊ |
259 | ␉␉␉break;␊ |
260 | ␉}␊ |
261 | }␊ |
262 | ␊ |
263 | void patch_cpuid_set_info(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
264 | {␊ |
265 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
266 | ␉␊ |
267 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
268 | ␊ |
269 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
270 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
271 | ␉␊ |
272 | ␉␊ |
273 | ␊ |
274 | ␉UInt32 jumpLocation = 0;␊ |
275 | ␉␊ |
276 | ␉␊ |
277 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
278 | ␉{␊ |
279 | ␉␉printf("Unable to locate _cpuid_set_info\n");␊ |
280 | ␉␉return;␊ |
281 | ␉␉␊ |
282 | ␉}␊ |
283 | ␊ |
284 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
285 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
286 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
287 | ␉{␊ |
288 | ␉␉printf("Unable to locate _panic\n");␊ |
289 | ␉␉return;␊ |
290 | ␉}␊ |
291 | ␉panicAddr -= (UInt32)kernelData;␊ |
292 | ␊ |
293 | ␉␊ |
294 | ␉␊ |
295 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
296 | ␉while( ␊ |
297 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
298 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
299 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
300 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
301 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
302 | ␉␉ )␊ |
303 | ␉{␊ |
304 | ␉␉patchLocation++;␊ |
305 | ␉}␊ |
306 | ␉patchLocation--;␊ |
307 | ␉␊ |
308 | ␉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]);␊ |
309 | ␉␊ |
310 | ␉// Remove panic call, just in case the following patch routines fail␊ |
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 | ␉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]);␊ |
317 | ␊ |
318 | ␉//getc();␊ |
319 | ␉␊ |
320 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
321 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
322 | ␉// NOTE: This will work on a *32* bit kernel and *not* on a 64 bit ont␊ |
323 | ␉jumpLocation = patchLocation - 15;␊ |
324 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
325 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -8)) &&␊ |
326 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
327 | ␉{␊ |
328 | ␉␉jumpLocation--;␊ |
329 | ␉}␊ |
330 | ␉␊ |
331 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
332 | ␉if(impersonateFamily &&␊ |
333 | ␉ impersonateModel &&␊ |
334 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
335 | ␉{␊ |
336 | ␉␉␊ |
337 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
338 | ␉␉␊ |
339 | ␉␉/* ␊ |
340 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
341 | ␉␉ */␊ |
342 | ␊ |
343 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
344 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
345 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
346 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 8 |␊ |
347 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 13] << 16 |␊ |
348 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 12] << 24;␊ |
349 | ␉␉␊ |
350 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
351 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 299; ␊ |
352 | ␉␉␊ |
353 | ␉␉␊ |
354 | ␉␉// cpufamily = CPUFAMILY_INTEL_PENRYN␊ |
355 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
356 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
357 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
358 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
359 | ␉␉␊ |
360 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
361 | ␉␉// nop and continue with the rest of the patch␊ |
362 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
363 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
364 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
365 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
366 | ␉␉␊ |
367 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
368 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
369 | ␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
370 | ␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
371 | ␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
372 | ␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
373 | ␉␉␊ |
374 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
375 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
376 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
377 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
378 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
379 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
380 | ␉␉␊ |
381 | ␉}␊ |
382 | ␉else if(impersonateFamily && impersonateModel)␊ |
383 | ␉{␊ |
384 | ␉␉// Eitehr a 64bit kernel *or* a pre 10.6.2 kernel␊ |
385 | ␉␉// Look for ␊ |
386 | ␉␉jumpLocation = patchLocation - 15;␊ |
387 | ␉␉while((bytes[jumpLocation - 2] != 0x0F ||␊ |
388 | ␉␉␉ bytes[jumpLocation - 1] != 0x87 ||␊ |
389 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - -31)) &&␊ |
390 | ␉␉␉ (patchLocation - jumpLocation) < 0x200)␊ |
391 | ␉␉{␊ |
392 | ␉␉␉jumpLocation--;␊ |
393 | ␉␉}␊ |
394 | ␉␉␊ |
395 | ␉␉␊ |
396 | ␉␉if((patchLocation - jumpLocation) < 0x200)␊ |
397 | ␉␉{␊ |
398 | ␉␉␉// 64 bit kernel, 10.6.2+␊ |
399 | ␉␉}␊ |
400 | ␉␉else␊ |
401 | ␉␉{␉// 32 bit kernel␊ |
402 | ␉␉␊ |
403 | ␉␉␉// pre 10.6.2 kernel␊ |
404 | ␉␉␉// Locate the jump to directly *after* the panic call,␊ |
405 | ␉␉␉jumpLocation = patchLocation - 4;␊ |
406 | ␉␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
407 | ␉␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
408 | ␉␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
409 | ␉␉␉{␊ |
410 | ␉␉␉␉jumpLocation--;␊ |
411 | ␉␉␉}␊ |
412 | ␉␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
413 | ␉␉␉// I'll just leave it to verify the binary stucture.␊ |
414 | ␉␉␉␊ |
415 | ␉␉␉// NOTE: the cpumodel_family data is not set in _cpuid_set_info␊ |
416 | ␉␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
417 | ␉␉␉// we set now.␊ |
418 | ␉␉␉␊ |
419 | ␉␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
420 | ␉␉␉{␊ |
421 | ␉␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
422 | ␉␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
423 | ␉␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
424 | ␉␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
425 | ␉␉␉␉// Remove jump␊ |
426 | ␉␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
427 | ␉␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
428 | ␉␉␉␉␊ |
429 | ␉␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
430 | ␉␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
431 | ␉␉␉␉␊ |
432 | ␉␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
433 | ␉␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
434 | ␉␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
435 | ␉␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
436 | ␉␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
437 | ␉␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
438 | ␉␉␉␉␊ |
439 | ␉␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
440 | ␉␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
441 | ␉␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
442 | ␉␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
443 | ␉␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
444 | ␉␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
445 | ␉␉␉␉␊ |
446 | ␉␉␉␉␊ |
447 | ␉␉␉␉␊ |
448 | ␉␉␉␉patchLocation = jumpLocation;␊ |
449 | ␉␉␉␉// We now have 14 bytes available for a patch␊ |
450 | ␉␉␉␉␊ |
451 | ␉␉␉}␊ |
452 | ␉␉}␊ |
453 | ␉␉/*else ␊ |
454 | ␉␉{␊ |
455 | ␉␉␉// Check for 64bit kernel.␊ |
456 | ␉␉␉␊ |
457 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
458 | ␉␉}*/␊ |
459 | ␉}␊ |
460 | ␉else ␊ |
461 | ␉{␊ |
462 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
463 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
464 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
465 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
466 | ␉}␊ |
467 | }␊ |
468 | ␊ |
469 | ␊ |
470 | /**␊ |
471 | ** SleepEnabler.kext replacement (for those that need it)␊ |
472 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
473 | **/␊ |
474 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
475 | {␊ |
476 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
477 | ␊ |
478 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
479 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
480 | ␉␊ |
481 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
482 | ␉{␊ |
483 | ␉␉printf("Unable to locate _pmCPUExitHaltToOff\n");␊ |
484 | ␉␉return;␊ |
485 | ␉}␊ |
486 | ␉␊ |
487 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
488 | ␉␊ |
489 | ␉␊ |
490 | ␉␊ |
491 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
492 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
493 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
494 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
495 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
496 | ␊ |
497 | ␉{␊ |
498 | ␉␉patchLocation++;␊ |
499 | ␉}␊ |
500 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
501 | }␊ |
502 | ␊ |
503 | void patch_lapic_init(void* kernelData)␊ |
504 | {␊ |
505 | ␊ |
506 | ␉UInt8 panicIndex = 0;␊ |
507 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
508 | ␉␊ |
509 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
510 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
511 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
512 | ␉{␊ |
513 | ␉␉printf("Unable to locate %s\n", "_lapic_init");␊ |
514 | ␉␉return;␊ |
515 | ␉␉␊ |
516 | ␉}␊ |
517 | ␉␊ |
518 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
519 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
520 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
521 | ␉{␊ |
522 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
523 | ␉␉return;␊ |
524 | ␉}␊ |
525 | ␉␊ |
526 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
527 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
528 | ␊ |
529 | ␉␊ |
530 | ␉␊ |
531 | ␉␊ |
532 | ␉// Locate the (panicIndex + 1) panic call␊ |
533 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
534 | ␉{␊ |
535 | ␉␉while( ␊ |
536 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
537 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
538 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
539 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
540 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
541 | ␉␉␉ )␊ |
542 | ␉␉{␊ |
543 | ␉␉␉patchLocation++;␊ |
544 | ␉␉}␊ |
545 | ␉␉patchLocation++;␊ |
546 | ␉␉panicIndex++;␊ |
547 | ␉}␊ |
548 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
549 | ␉␊ |
550 | ␉bytes[--patchLocation] = 0x90;␉␊ |
551 | ␉bytes[++patchLocation] = 0x90;␊ |
552 | ␉bytes[++patchLocation] = 0x90;␊ |
553 | ␉bytes[++patchLocation] = 0x90;␊ |
554 | ␉bytes[++patchLocation] = 0x90;␊ |
555 | ␉␊ |
556 | ␉␊ |
557 | }␊ |
558 | ␊ |
559 | ␊ |
560 | void patch_commpage_stuff_routine(void* kernelData)␊ |
561 | {␊ |
562 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
563 | ␊ |
564 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
565 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
566 | ␉{␊ |
567 | ␉␉printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
568 | ␉␉return;␊ |
569 | ␉␉␊ |
570 | ␉}␊ |
571 | ␉␊ |
572 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
573 | ␊ |
574 | ␉␊ |
575 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
576 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
577 | ␉{␊ |
578 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
579 | ␉␉return;␊ |
580 | ␉}␊ |
581 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
582 | ␊ |
583 | ␉patchLocation -= (UInt32)kernelData;␊ |
584 | ␉panicAddr -= (UInt32)kernelData;␊ |
585 | ␉␊ |
586 | ␉while( ␊ |
587 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
588 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
589 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
590 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
591 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
592 | ␉␉ )␊ |
593 | ␉{␊ |
594 | ␉␉patchLocation++;␊ |
595 | ␉}␊ |
596 | ␉patchLocation--;␊ |
597 | ␉␊ |
598 | ␉// Replace panic with nops␊ |
599 | ␉bytes[patchLocation + 0] = 0x90;␊ |
600 | ␉bytes[patchLocation + 1] = 0x90;␊ |
601 | ␉bytes[patchLocation + 2] = 0x90;␊ |
602 | ␉bytes[patchLocation + 3] = 0x90;␊ |
603 | ␉bytes[patchLocation + 4] = 0x90;␊ |
604 | ␉␊ |
605 | ␉␊ |
606 | }␊ |
607 | ␊ |
608 | void patch_lapic_interrupt(void* kernelData)␊ |
609 | {␊ |
610 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
611 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
612 | ␉␊ |
613 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
614 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
615 | ␉{␊ |
616 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt");␊ |
617 | ␉␉return;␊ |
618 | ␉␉␊ |
619 | ␉}␊ |
620 | ␉␊ |
621 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
622 | ␉␊ |
623 | ␉␊ |
624 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
625 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
626 | ␉{␊ |
627 | ␉␉printf("Unable to locate %s\n", "_panic");␊ |
628 | ␉␉return;␊ |
629 | ␉}␊ |
630 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
631 | ␉␊ |
632 | ␉patchLocation -= (UInt32)kernelData;␊ |
633 | ␉panicAddr -= (UInt32)kernelData;␊ |
634 | ␉␊ |
635 | ␉while( ␊ |
636 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
637 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
638 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
639 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
640 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
641 | ␉␉ )␊ |
642 | ␉{␊ |
643 | ␉␉patchLocation++;␊ |
644 | ␉}␊ |
645 | ␉patchLocation--;␊ |
646 | ␉␊ |
647 | ␉// Replace panic with nops␊ |
648 | ␉bytes[patchLocation + 0] = 0x90;␊ |
649 | ␉bytes[patchLocation + 1] = 0x90;␊ |
650 | ␉bytes[patchLocation + 2] = 0x90;␊ |
651 | ␉bytes[patchLocation + 3] = 0x90;␊ |
652 | ␉bytes[patchLocation + 4] = 0x90;␊ |
653 | ␉␊ |
654 | ␉␊ |
655 | }␊ |
656 | ␊ |
657 | ␊ |
658 | void patch_lapic_configure(void* kernelData)␊ |
659 | {␊ |
660 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
661 | ␉␊ |
662 | ␉UInt32 patchLocation;␊ |
663 | ␉UInt32 lapicStart;␊ |
664 | ␉UInt32 lapicInterruptBase;␊ |
665 | ␉␊ |
666 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
667 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
668 | ␉{␊ |
669 | ␉␉printf("Unable to locate %s\n", "_lapic_configure");␊ |
670 | ␉␉return;␊ |
671 | ␉}␊ |
672 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
673 | ␉␊ |
674 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
675 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
676 | ␉{␊ |
677 | ␉␉printf("Unable to locate %s\n", "_lapic_start");␊ |
678 | ␉␉return;␊ |
679 | ␉}␊ |
680 | ␉lapicStart = symbol->addr; ␊ |
681 | ␊ |
682 | ␊ |
683 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
684 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
685 | ␉{␊ |
686 | ␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
687 | ␉␉return;␊ |
688 | ␉}␊ |
689 | ␉lapicInterruptBase = symbol->addr;␊ |
690 | ␉patchLocation -= (UInt32)kernelData;␊ |
691 | ␉lapicStart -= (UInt32)kernelData;␊ |
692 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
693 | ␉␊ |
694 | ␉␊ |
695 | ␉// Looking for the following:␊ |
696 | ␉//movl _lapic_start,%e_x␊ |
697 | ␉//addl $0x00000320,%e_x␊ |
698 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
699 | ␉while( ␊ |
700 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
701 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
702 | ␉␉ ( lapicStart != (UInt32)(␊ |
703 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
704 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
705 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
706 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
707 | ␉␉␉␉␉␉␉␉␉)␊ |
708 | ␉␉␉␉␉␉␉␉ )␊ |
709 | ␉␉ ) || ␊ |
710 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
711 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
712 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
713 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
714 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
715 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
716 | ␊ |
717 | ␉␉ )␊ |
718 | ␉{␊ |
719 | ␉␉patchLocation++;␊ |
720 | ␉}␊ |
721 | ␉patchLocation-=2;␊ |
722 | ␊ |
723 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
724 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
725 | ␉␊ |
726 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
727 | ␉/*␊ |
728 | ␉bytes[patchLocation++] = 0x8B;␊ |
729 | ␉bytes[patchLocation++] = 0x15;␊ |
730 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
731 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
732 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
733 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
734 | ␉*/␊ |
735 | ␉patchLocation += 6;␊ |
736 | ␉␊ |
737 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
738 | ␉/*␊ |
739 | ␉bytes[patchLocation++] = 0x81;␊ |
740 | ␉bytes[patchLocation++] = 0xC2;␊ |
741 | ␉*/␊ |
742 | ␉patchLocation += 2;␊ |
743 | ␉bytes[patchLocation++] = 0x60;␊ |
744 | ␉/*␊ |
745 | ␉bytes[patchLocation++];// = 0x03;␊ |
746 | ␉bytes[patchLocation++];// = 0x00;␊ |
747 | ␉bytes[patchLocation++];// = 0x00;␊ |
748 | ␉*/␊ |
749 | ␉ patchLocation += 3;␊ |
750 | ␊ |
751 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
752 | ␉bytes[patchLocation++] = 0xC7;␊ |
753 | ␉bytes[patchLocation++] = 0x02;␊ |
754 | ␉bytes[patchLocation++] = 0x00;␊ |
755 | ␉bytes[patchLocation++] = 0x04;␊ |
756 | ␉bytes[patchLocation++] = 0x00;␊ |
757 | ␉bytes[patchLocation++] = 0x00;␊ |
758 | ␉␊ |
759 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
760 | ␉bytes[patchLocation++] = 0x83;␊ |
761 | ␉bytes[patchLocation++] = 0xEA;␊ |
762 | ␉bytes[patchLocation++] = 0x40;␊ |
763 | ␊ |
764 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
765 | ␉bytes[patchLocation++] = 0xA1;␊ |
766 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
767 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
768 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
769 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
770 | ␊ |
771 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
772 | ␉bytes[patchLocation++] = 0x83;␊ |
773 | ␉bytes[patchLocation++] = 0xC0;␊ |
774 | ␉bytes[patchLocation++] = 0x0E;␊ |
775 | ␊ |
776 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
777 | ␉bytes[patchLocation++] = 0x89;␊ |
778 | ␉bytes[patchLocation++] = 0x02;␊ |
779 | ␉␊ |
780 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
781 | ␉bytes[patchLocation++] = 0x81;␊ |
782 | ␉bytes[patchLocation++] = 0xC2;␊ |
783 | ␉bytes[patchLocation++] = 0x30;␊ |
784 | ␉bytes[patchLocation++] = 0x03;␊ |
785 | ␉bytes[patchLocation++] = 0x00;␊ |
786 | ␉bytes[patchLocation++] = 0x00;␊ |
787 | ␉␊ |
788 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
789 | ␉bytes[patchLocation++] = 0xA1;␊ |
790 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
791 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
792 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
793 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
794 | ␉␊ |
795 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
796 | ␉bytes[patchLocation++] = 0x83;␊ |
797 | ␉bytes[patchLocation++] = 0xC0;␊ |
798 | ␉bytes[patchLocation++] = 0x0F;␊ |
799 | ␉␊ |
800 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
801 | ␉bytes[patchLocation++] = 0x89;␊ |
802 | ␉bytes[patchLocation++] = 0x02;␊ |
803 | ␉␊ |
804 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
805 | ␉bytes[patchLocation++] = 0x83;␊ |
806 | ␉bytes[patchLocation++] = 0xEA;␊ |
807 | ␉bytes[patchLocation++] = 0x10;␊ |
808 | ␊ |
809 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
810 | ␉bytes[patchLocation++] = 0xA1;␊ |
811 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
812 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
813 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
814 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
815 | ␉␊ |
816 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
817 | ␉bytes[patchLocation++] = 0x83;␊ |
818 | ␉bytes[patchLocation++] = 0xC0;␊ |
819 | ␉bytes[patchLocation++] = 0x0C;␊ |
820 | ␊ |
821 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
822 | ␉bytes[patchLocation++] = 0x89;␊ |
823 | ␉bytes[patchLocation++] = 0x02;␊ |
824 | ␊ |
825 | ␉// Replace remaining with nops␊ |
826 | ␊ |
827 | ␊ |
828 | ␉bytes[patchLocation++] = 0x90;␊ |
829 | ␉bytes[patchLocation++] = 0x90;␊ |
830 | ␉bytes[patchLocation++] = 0x90;␊ |
831 | ␉bytes[patchLocation++] = 0x90;␊ |
832 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
833 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
834 | }␊ |
835 | |