| 1 | /* |
| 2 | * Copyright (c) 2018 Virtuozzo International GmbH |
| 3 | * |
| 4 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include "qemu/osdep.h" |
| 9 | #include "qemu/bitops.h" |
| 10 | |
| 11 | #include "err.h" |
| 12 | #include "addrspace.h" |
| 13 | #include "pe.h" |
| 14 | #include "pdb.h" |
| 15 | #include "kdbg.h" |
| 16 | #include "download.h" |
| 17 | #include "qemu/win_dump_defs.h" |
| 18 | |
| 19 | #define SYM_URL_BASE "https://msdl.microsoft.com/download/symbols/" |
| 20 | #define PDB_NAME "ntkrnlmp.pdb" |
| 21 | #define PE_NAME "ntoskrnl.exe" |
| 22 | |
| 23 | #define INITIAL_MXCSR 0x1f80 |
| 24 | #define MAX_NUMBER_OF_RUNS 42 |
| 25 | |
| 26 | typedef struct idt_desc { |
| 27 | uint16_t offset1; /* offset bits 0..15 */ |
| 28 | uint16_t selector; |
| 29 | uint8_t ist; |
| 30 | uint8_t type_attr; |
| 31 | uint16_t offset2; /* offset bits 16..31 */ |
| 32 | uint32_t offset3; /* offset bits 32..63 */ |
| 33 | uint32_t rsrvd; |
| 34 | } __attribute__ ((packed)) idt_desc_t; |
| 35 | |
| 36 | static uint64_t idt_desc_addr(idt_desc_t desc) |
| 37 | { |
| 38 | return (uint64_t)desc.offset1 | ((uint64_t)desc.offset2 << 16) | |
| 39 | ((uint64_t)desc.offset3 << 32); |
| 40 | } |
| 41 | |
| 42 | static const uint64_t SharedUserData = 0xfffff78000000000; |
| 43 | |
| 44 | #define KUSD_OFFSET_SUITE_MASK 0x2d0 |
| 45 | #define KUSD_OFFSET_PRODUCT_TYPE 0x264 |
| 46 | |
| 47 | #define SYM_RESOLVE(base, r, s) ((s = pdb_resolve(base, r, #s)),\ |
| 48 | s ? printf(#s" = 0x%016"PRIx64"\n", s) :\ |
| 49 | eprintf("Failed to resolve "#s"\n"), s) |
| 50 | |
| 51 | /* |
| 52 | * Decoding algorithm can be found in Volatility project |
| 53 | */ |
| 54 | static void kdbg_decode(uint64_t *dst, uint64_t *src, size_t size, |
| 55 | uint64_t kwn, uint64_t kwa, uint64_t kdbe) |
| 56 | { |
| 57 | size_t i; |
| 58 | assert(size % sizeof(uint64_t) == 0); |
| 59 | for (i = 0; i < size / sizeof(uint64_t); i++) { |
| 60 | uint64_t block; |
| 61 | |
| 62 | block = src[i]; |
| 63 | block = rol64(block ^ kwn, kwn); |
| 64 | block = __builtin_bswap64(block ^ kdbe) ^ kwa; |
| 65 | dst[i] = block; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | static KDDEBUGGER_DATA64 *get_kdbg(uint64_t KernBase, struct pdb_reader *pdb, |
| 70 | struct va_space *vs, uint64_t KdDebuggerDataBlock) |
| 71 | { |
| 72 | const char OwnerTag[4] = "KDBG"; |
| 73 | KDDEBUGGER_DATA64 *kdbg = NULL; |
| 74 | DBGKD_DEBUG_DATA_HEADER64 kdbg_hdr; |
| 75 | bool decode = false; |
| 76 | uint64_t kwn, kwa, KdpDataBlockEncoded; |
| 77 | |
| 78 | if (!va_space_rw(vs, |
| 79 | KdDebuggerDataBlock + offsetof(KDDEBUGGER_DATA64, Header), |
| 80 | &kdbg_hdr, sizeof(kdbg_hdr), 0)) { |
| 81 | eprintf("Failed to extract KDBG header\n"); |
| 82 | return NULL; |
| 83 | } |
| 84 | |
| 85 | if (memcmp(&kdbg_hdr.OwnerTag, OwnerTag, sizeof(OwnerTag))) { |
| 86 | uint64_t KiWaitNever, KiWaitAlways; |
| 87 | |
| 88 | decode = true; |
| 89 | |
| 90 | if (!SYM_RESOLVE(KernBase, pdb, KiWaitNever) || |
| 91 | !SYM_RESOLVE(KernBase, pdb, KiWaitAlways) || |
| 92 | !SYM_RESOLVE(KernBase, pdb, KdpDataBlockEncoded)) { |
| 93 | return NULL; |
| 94 | } |
| 95 | |
| 96 | if (!va_space_rw(vs, KiWaitNever, &kwn, sizeof(kwn), 0) || |
| 97 | !va_space_rw(vs, KiWaitAlways, &kwa, sizeof(kwa), 0)) { |
| 98 | return NULL; |
| 99 | } |
| 100 | |
| 101 | printf("[KiWaitNever] = 0x%016"PRIx64"\n", kwn); |
| 102 | printf("[KiWaitAlways] = 0x%016"PRIx64"\n", kwa); |
| 103 | |
| 104 | /* |
| 105 | * If KDBG header can be decoded, KDBG size is available |
| 106 | * and entire KDBG can be decoded. |
| 107 | */ |
| 108 | printf("Decoding KDBG header...\n"); |
| 109 | kdbg_decode((uint64_t *)&kdbg_hdr, (uint64_t *)&kdbg_hdr, |
| 110 | sizeof(kdbg_hdr), kwn, kwa, KdpDataBlockEncoded); |
| 111 | |
| 112 | printf("Owner tag is \'%.4s\'\n", (char *)&kdbg_hdr.OwnerTag); |
| 113 | if (memcmp(&kdbg_hdr.OwnerTag, OwnerTag, sizeof(OwnerTag))) { |
| 114 | eprintf("Failed to decode KDBG header\n"); |
| 115 | return NULL; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | kdbg = g_malloc(kdbg_hdr.Size); |
| 120 | |
| 121 | if (!va_space_rw(vs, KdDebuggerDataBlock, kdbg, kdbg_hdr.Size, 0)) { |
| 122 | eprintf("Failed to extract entire KDBG\n"); |
| 123 | g_free(kdbg); |
| 124 | return NULL; |
| 125 | } |
| 126 | |
| 127 | if (!decode) { |
| 128 | return kdbg; |
| 129 | } |
| 130 | |
| 131 | printf("Decoding KdDebuggerDataBlock...\n"); |
| 132 | kdbg_decode((uint64_t *)kdbg, (uint64_t *)kdbg, kdbg_hdr.Size, |
| 133 | kwn, kwa, KdpDataBlockEncoded); |
| 134 | |
| 135 | va_space_rw(vs, KdDebuggerDataBlock, kdbg, kdbg_hdr.Size, 1); |
| 136 | |
| 137 | return kdbg; |
| 138 | } |
| 139 | |
| 140 | static void win_context_init_from_qemu_cpu_state(WinContext64 *ctx, |
| 141 | QEMUCPUState *s) |
| 142 | { |
| 143 | WinContext64 win_ctx = (WinContext64){ |
| 144 | .ContextFlags = WIN_CTX_X64 | WIN_CTX_INT | WIN_CTX_SEG | WIN_CTX_CTL, |
| 145 | .MxCsr = INITIAL_MXCSR, |
| 146 | |
| 147 | .SegCs = s->cs.selector, |
| 148 | .SegSs = s->ss.selector, |
| 149 | .SegDs = s->ds.selector, |
| 150 | .SegEs = s->es.selector, |
| 151 | .SegFs = s->fs.selector, |
| 152 | .SegGs = s->gs.selector, |
| 153 | .EFlags = (uint32_t)s->rflags, |
| 154 | |
| 155 | .Rax = s->rax, |
| 156 | .Rbx = s->rbx, |
| 157 | .Rcx = s->rcx, |
| 158 | .Rdx = s->rdx, |
| 159 | .Rsp = s->rsp, |
| 160 | .Rbp = s->rbp, |
| 161 | .Rsi = s->rsi, |
| 162 | .Rdi = s->rdi, |
| 163 | .R8 = s->r8, |
| 164 | .R9 = s->r9, |
| 165 | .R10 = s->r10, |
| 166 | .R11 = s->r11, |
| 167 | .R12 = s->r12, |
| 168 | .R13 = s->r13, |
| 169 | .R14 = s->r14, |
| 170 | .R15 = s->r15, |
| 171 | |
| 172 | .Rip = s->rip, |
| 173 | .FltSave = { |
| 174 | .MxCsr = INITIAL_MXCSR, |
| 175 | }, |
| 176 | }; |
| 177 | |
| 178 | *ctx = win_ctx; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * Finds paging-structure hierarchy base, |
| 183 | * if previously set doesn't give access to kernel structures |
| 184 | */ |
| 185 | static bool fix_dtb(struct va_space *vs, QEMU_Elf *qe) |
| 186 | { |
| 187 | /* |
| 188 | * Firstly, test previously set DTB. |
| 189 | */ |
| 190 | if (va_space_resolve(vs, SharedUserData)) { |
| 191 | return true; |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * Secondly, find CPU which run system task. |
| 196 | */ |
| 197 | size_t i; |
| 198 | for (i = 0; i < qe->state_nr; i++) { |
| 199 | QEMUCPUState *s = qe->state[i]; |
| 200 | |
| 201 | if (is_system(s)) { |
| 202 | va_space_set_dtb(vs, s->cr[3]); |
| 203 | printf("DTB 0x%016"PRIx64" has been found from CPU #%zu" |
| 204 | " as system task CR3\n", vs->dtb, i); |
| 205 | return va_space_resolve(vs, SharedUserData); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Thirdly, use KERNEL_GS_BASE from CPU #0 as PRCB address and |
| 211 | * CR3 as [Prcb+0x7000] |
| 212 | */ |
| 213 | if (qe->has_kernel_gs_base) { |
| 214 | QEMUCPUState *s = qe->state[0]; |
| 215 | uint64_t Prcb = s->kernel_gs_base; |
| 216 | uint64_t *cr3 = va_space_resolve(vs, Prcb + 0x7000); |
| 217 | |
| 218 | if (!cr3) { |
| 219 | return false; |
| 220 | } |
| 221 | |
| 222 | va_space_set_dtb(vs, *cr3); |
| 223 | printf("DirectoryTableBase = 0x%016"PRIx64" has been found from CPU #0" |
| 224 | " as interrupt handling CR3\n", vs->dtb); |
| 225 | return va_space_resolve(vs, SharedUserData); |
| 226 | } |
| 227 | |
| 228 | return true; |
| 229 | } |
| 230 | |
| 231 | static void try_merge_runs(struct pa_space *ps, |
| 232 | WinDumpPhyMemDesc64 *PhysicalMemoryBlock) |
| 233 | { |
| 234 | unsigned int merge_cnt = 0, run_idx = 0; |
| 235 | |
| 236 | PhysicalMemoryBlock->NumberOfRuns = 0; |
| 237 | |
| 238 | for (size_t idx = 0; idx < ps->block_nr; idx++) { |
| 239 | struct pa_block *blk = ps->block + idx; |
| 240 | struct pa_block *next = blk + 1; |
| 241 | |
| 242 | PhysicalMemoryBlock->NumberOfPages += blk->size / ELF2DMP_PAGE_SIZE; |
| 243 | |
| 244 | if (idx + 1 != ps->block_nr && blk->paddr + blk->size == next->paddr) { |
| 245 | printf("Block #%zu 0x%"PRIx64"+:0x%"PRIx64" and %u previous will be" |
| 246 | " merged\n", idx, blk->paddr, blk->size, merge_cnt); |
| 247 | merge_cnt++; |
| 248 | } else { |
| 249 | struct pa_block *first_merged = blk - merge_cnt; |
| 250 | |
| 251 | printf("Block #%zu 0x%"PRIx64"+:0x%"PRIx64" and %u previous will be" |
| 252 | " merged to 0x%"PRIx64"+:0x%"PRIx64" (run #%u)\n", |
| 253 | idx, blk->paddr, blk->size, merge_cnt, first_merged->paddr, |
| 254 | blk->paddr + blk->size - first_merged->paddr, run_idx); |
| 255 | PhysicalMemoryBlock->Run[run_idx] = (WinDumpPhyMemRun64) { |
| 256 | .BasePage = first_merged->paddr / ELF2DMP_PAGE_SIZE, |
| 257 | .PageCount = (blk->paddr + blk->size - first_merged->paddr) / |
| 258 | ELF2DMP_PAGE_SIZE, |
| 259 | }; |
| 260 | PhysicalMemoryBlock->NumberOfRuns++; |
| 261 | run_idx++; |
| 262 | merge_cnt = 0; |
| 263 | } |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | static bool fill_header(WinDumpHeader64 *hdr, struct pa_space *ps, |
| 268 | struct va_space *vs, uint64_t KdDebuggerDataBlock, |
| 269 | KDDEBUGGER_DATA64 *kdbg, uint64_t KdVersionBlock, |
| 270 | int nr_cpus) |
| 271 | { |
| 272 | uint32_t *suite_mask = va_space_resolve(vs, SharedUserData + |
| 273 | KUSD_OFFSET_SUITE_MASK); |
| 274 | int32_t *product_type = va_space_resolve(vs, SharedUserData + |
| 275 | KUSD_OFFSET_PRODUCT_TYPE); |
| 276 | DBGKD_GET_VERSION64 kvb; |
| 277 | WinDumpHeader64 h; |
| 278 | |
| 279 | QEMU_BUILD_BUG_ON(KUSD_OFFSET_SUITE_MASK >= ELF2DMP_PAGE_SIZE); |
| 280 | QEMU_BUILD_BUG_ON(KUSD_OFFSET_PRODUCT_TYPE >= ELF2DMP_PAGE_SIZE); |
| 281 | |
| 282 | if (!suite_mask || !product_type) { |
| 283 | return false; |
| 284 | } |
| 285 | |
| 286 | if (!va_space_rw(vs, KdVersionBlock, &kvb, sizeof(kvb), 0)) { |
| 287 | eprintf("Failed to extract KdVersionBlock\n"); |
| 288 | return false; |
| 289 | } |
| 290 | |
| 291 | h = (WinDumpHeader64) { |
| 292 | .Signature = "PAGE", |
| 293 | .ValidDump = "DU64", |
| 294 | .MajorVersion = kvb.MajorVersion, |
| 295 | .MinorVersion = kvb.MinorVersion, |
| 296 | .DirectoryTableBase = vs->dtb, |
| 297 | .PfnDatabase = kdbg->MmPfnDatabase, |
| 298 | .PsLoadedModuleList = kdbg->PsLoadedModuleList, |
| 299 | .PsActiveProcessHead = kdbg->PsActiveProcessHead, |
| 300 | .MachineImageType = kvb.MachineType, |
| 301 | .NumberProcessors = nr_cpus, |
| 302 | .BugcheckCode = LIVE_SYSTEM_DUMP, |
| 303 | .KdDebuggerDataBlock = KdDebuggerDataBlock, |
| 304 | .DumpType = 1, |
| 305 | .Comment = "Hello from elf2dmp!", |
| 306 | .SuiteMask = *suite_mask, |
| 307 | .ProductType = *product_type, |
| 308 | .SecondaryDataState = kvb.KdSecondaryVersion, |
| 309 | .PhysicalMemoryBlock = (WinDumpPhyMemDesc64) { |
| 310 | .NumberOfRuns = ps->block_nr, |
| 311 | }, |
| 312 | .RequiredDumpSpace = sizeof(h), |
| 313 | }; |
| 314 | |
| 315 | if (h.PhysicalMemoryBlock.NumberOfRuns <= MAX_NUMBER_OF_RUNS) { |
| 316 | for (size_t idx = 0; idx < ps->block_nr; idx++) { |
| 317 | h.PhysicalMemoryBlock.NumberOfPages += |
| 318 | ps->block[idx].size / ELF2DMP_PAGE_SIZE; |
| 319 | h.PhysicalMemoryBlock.Run[idx] = (WinDumpPhyMemRun64) { |
| 320 | .BasePage = ps->block[idx].paddr / ELF2DMP_PAGE_SIZE, |
| 321 | .PageCount = ps->block[idx].size / ELF2DMP_PAGE_SIZE, |
| 322 | }; |
| 323 | } |
| 324 | } else { |
| 325 | try_merge_runs(ps, &h.PhysicalMemoryBlock); |
| 326 | } |
| 327 | |
| 328 | h.RequiredDumpSpace += |
| 329 | h.PhysicalMemoryBlock.NumberOfPages << ELF2DMP_PAGE_BITS; |
| 330 | |
| 331 | *hdr = h; |
| 332 | |
| 333 | return true; |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * fill_context() continues even if it fails to fill contexts of some CPUs. |
| 338 | * A dump may still contain valuable information even if it lacks contexts of |
| 339 | * some CPUs due to dump corruption or a failure before starting CPUs. |
| 340 | */ |
| 341 | static void fill_context(KDDEBUGGER_DATA64 *kdbg, |
| 342 | struct va_space *vs, QEMU_Elf *qe) |
| 343 | { |
| 344 | int i; |
| 345 | |
| 346 | for (i = 0; i < qe->state_nr; i++) { |
| 347 | uint64_t Prcb; |
| 348 | uint64_t Context; |
| 349 | WinContext64 ctx; |
| 350 | QEMUCPUState *s = qe->state[i]; |
| 351 | |
| 352 | if (!va_space_rw(vs, kdbg->KiProcessorBlock + sizeof(Prcb) * i, |
| 353 | &Prcb, sizeof(Prcb), 0)) { |
| 354 | eprintf("Failed to read CPU #%d PRCB location\n", i); |
| 355 | continue; |
| 356 | } |
| 357 | |
| 358 | if (!Prcb) { |
| 359 | eprintf("Context for CPU #%d is missing\n", i); |
| 360 | continue; |
| 361 | } |
| 362 | |
| 363 | if (!va_space_rw(vs, Prcb + kdbg->OffsetPrcbContext, |
| 364 | &Context, sizeof(Context), 0)) { |
| 365 | eprintf("Failed to read CPU #%d ContextFrame location\n", i); |
| 366 | continue; |
| 367 | } |
| 368 | |
| 369 | printf("Filling context for CPU #%d...\n", i); |
| 370 | win_context_init_from_qemu_cpu_state(&ctx, s); |
| 371 | |
| 372 | if (!va_space_rw(vs, Context, &ctx, sizeof(ctx), 1)) { |
| 373 | eprintf("Failed to fill CPU #%d context\n", i); |
| 374 | continue; |
| 375 | } |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | static bool pe_get_data_dir_entry(uint64_t base, void *start_addr, int idx, |
| 380 | void *entry, size_t size, struct va_space *vs) |
| 381 | { |
| 382 | const char e_magic[2] = "MZ"; |
| 383 | const char Signature[4] = "PE\0\0"; |
| 384 | IMAGE_DOS_HEADER *dos_hdr = start_addr; |
| 385 | IMAGE_NT_HEADERS64 nt_hdrs; |
| 386 | IMAGE_FILE_HEADER *file_hdr = &nt_hdrs.FileHeader; |
| 387 | IMAGE_OPTIONAL_HEADER64 *opt_hdr = &nt_hdrs.OptionalHeader; |
| 388 | IMAGE_DATA_DIRECTORY *data_dir = nt_hdrs.OptionalHeader.DataDirectory; |
| 389 | |
| 390 | QEMU_BUILD_BUG_ON(sizeof(*dos_hdr) >= ELF2DMP_PAGE_SIZE); |
| 391 | |
| 392 | if (memcmp(&dos_hdr->e_magic, e_magic, sizeof(e_magic))) { |
| 393 | return false; |
| 394 | } |
| 395 | |
| 396 | if (!va_space_rw(vs, base + dos_hdr->e_lfanew, |
| 397 | &nt_hdrs, sizeof(nt_hdrs), 0)) { |
| 398 | return false; |
| 399 | } |
| 400 | |
| 401 | if (memcmp(&nt_hdrs.Signature, Signature, sizeof(Signature)) || |
| 402 | file_hdr->Machine != 0x8664 || opt_hdr->Magic != 0x020b) { |
| 403 | return false; |
| 404 | } |
| 405 | |
| 406 | if (!va_space_rw(vs, base + data_dir[idx].VirtualAddress, entry, size, 0)) { |
| 407 | return false; |
| 408 | } |
| 409 | |
| 410 | printf("Data directory entry #%d: RVA = 0x%08"PRIx32"\n", idx, |
| 411 | (uint32_t)data_dir[idx].VirtualAddress); |
| 412 | |
| 413 | return true; |
| 414 | } |
| 415 | |
| 416 | static bool write_dump(struct pa_space *ps, |
| 417 | WinDumpHeader64 *hdr, const char *name) |
| 418 | { |
| 419 | FILE *dmp_file = fopen(name, "wb"); |
| 420 | size_t i; |
| 421 | |
| 422 | if (!dmp_file) { |
| 423 | eprintf("Failed to open output file \'%s\'\n", name); |
| 424 | return false; |
| 425 | } |
| 426 | |
| 427 | printf("Writing header to file...\n"); |
| 428 | |
| 429 | if (fwrite(hdr, sizeof(*hdr), 1, dmp_file) != 1) { |
| 430 | eprintf("Failed to write dump header\n"); |
| 431 | fclose(dmp_file); |
| 432 | return false; |
| 433 | } |
| 434 | |
| 435 | for (i = 0; i < ps->block_nr; i++) { |
| 436 | struct pa_block *b = &ps->block[i]; |
| 437 | |
| 438 | printf("Writing block #%zu/%zu of %"PRIu64" bytes to file...\n", i, |
| 439 | ps->block_nr, b->size); |
| 440 | if (fwrite(b->addr, b->size, 1, dmp_file) != 1) { |
| 441 | eprintf("Failed to write block\n"); |
| 442 | fclose(dmp_file); |
| 443 | return false; |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | return !fclose(dmp_file); |
| 448 | } |
| 449 | |
| 450 | static bool pe_check_pdb_name(uint64_t base, void *start_addr, |
| 451 | struct va_space *vs, OMFSignatureRSDS *rsds) |
| 452 | { |
| 453 | const char sign_rsds[4] = "RSDS"; |
| 454 | IMAGE_DEBUG_DIRECTORY debug_dir; |
| 455 | char pdb_name[sizeof(PDB_NAME)]; |
| 456 | |
| 457 | if (!pe_get_data_dir_entry(base, start_addr, IMAGE_FILE_DEBUG_DIRECTORY, |
| 458 | &debug_dir, sizeof(debug_dir), vs)) { |
| 459 | eprintf("Failed to get Debug Directory\n"); |
| 460 | return false; |
| 461 | } |
| 462 | |
| 463 | if (debug_dir.Type != IMAGE_DEBUG_TYPE_CODEVIEW) { |
| 464 | eprintf("Debug Directory type is not CodeView\n"); |
| 465 | return false; |
| 466 | } |
| 467 | |
| 468 | if (!va_space_rw(vs, base + debug_dir.AddressOfRawData, |
| 469 | rsds, sizeof(*rsds), 0)) { |
| 470 | eprintf("Failed to resolve OMFSignatureRSDS\n"); |
| 471 | return false; |
| 472 | } |
| 473 | |
| 474 | if (memcmp(&rsds->Signature, sign_rsds, sizeof(sign_rsds))) { |
| 475 | eprintf("CodeView signature is \'%.4s\', \'%.4s\' expected\n", |
| 476 | rsds->Signature, sign_rsds); |
| 477 | return false; |
| 478 | } |
| 479 | |
| 480 | if (debug_dir.SizeOfData - sizeof(*rsds) != sizeof(PDB_NAME)) { |
| 481 | eprintf("PDB name size doesn't match\n"); |
| 482 | return false; |
| 483 | } |
| 484 | |
| 485 | if (!va_space_rw(vs, base + debug_dir.AddressOfRawData + |
| 486 | offsetof(OMFSignatureRSDS, name), |
| 487 | pdb_name, sizeof(PDB_NAME), 0)) { |
| 488 | eprintf("Failed to resolve PDB name\n"); |
| 489 | return false; |
| 490 | } |
| 491 | |
| 492 | printf("PDB name is \'%s\', \'%s\' expected\n", pdb_name, PDB_NAME); |
| 493 | |
| 494 | return !strcmp(pdb_name, PDB_NAME); |
| 495 | } |
| 496 | |
| 497 | int main(int argc, char *argv[]) |
| 498 | { |
| 499 | int err = 1; |
| 500 | QEMU_Elf qemu_elf; |
| 501 | struct pa_space ps; |
| 502 | struct va_space vs; |
| 503 | QEMUCPUState *state; |
| 504 | idt_desc_t first_idt_desc; |
| 505 | uint64_t KernBase; |
| 506 | void *nt_start_addr = NULL; |
| 507 | WinDumpHeader64 header; |
| 508 | g_autofree char *pdb_url = NULL; |
| 509 | struct pdb_reader pdb; |
| 510 | uint64_t KdDebuggerDataBlock; |
| 511 | KDDEBUGGER_DATA64 *kdbg; |
| 512 | uint64_t KdVersionBlock; |
| 513 | bool kernel_found = false; |
| 514 | OMFSignatureRSDS rsds; |
| 515 | |
| 516 | if (argc != 3) { |
| 517 | eprintf("usage:\n\t%s elf_file dmp_file\n", argv[0]); |
| 518 | return 1; |
| 519 | } |
| 520 | |
| 521 | if (!QEMU_Elf_init(&qemu_elf, argv[1])) { |
| 522 | eprintf("Failed to initialize QEMU ELF dump\n"); |
| 523 | return 1; |
| 524 | } |
| 525 | |
| 526 | pa_space_create(&ps, &qemu_elf); |
| 527 | |
| 528 | state = qemu_elf.state[0]; |
| 529 | printf("CPU #0 CR3 is 0x%016"PRIx64"\n", state->cr[3]); |
| 530 | |
| 531 | va_space_create(&vs, &ps, state->cr[3]); |
| 532 | if (!fix_dtb(&vs, &qemu_elf)) { |
| 533 | eprintf("Failed to find paging base\n"); |
| 534 | goto out_ps; |
| 535 | } |
| 536 | |
| 537 | printf("CPU #0 IDT is at 0x%016"PRIx64"\n", state->idt.base); |
| 538 | |
| 539 | if (!va_space_rw(&vs, state->idt.base, |
| 540 | &first_idt_desc, sizeof(first_idt_desc), 0)) { |
| 541 | eprintf("Failed to get CPU #0 IDT[0]\n"); |
| 542 | goto out_ps; |
| 543 | } |
| 544 | printf("CPU #0 IDT[0] -> 0x%016"PRIx64"\n", idt_desc_addr(first_idt_desc)); |
| 545 | |
| 546 | KernBase = idt_desc_addr(first_idt_desc) & ~(ELF2DMP_PAGE_SIZE - 1); |
| 547 | printf("Searching kernel downwards from 0x%016"PRIx64"...\n", KernBase); |
| 548 | |
| 549 | for (; KernBase >= 0xfffff78000000000; KernBase -= ELF2DMP_PAGE_SIZE) { |
| 550 | nt_start_addr = va_space_resolve(&vs, KernBase); |
| 551 | if (!nt_start_addr) { |
| 552 | continue; |
| 553 | } |
| 554 | |
| 555 | if (*(uint16_t *)nt_start_addr == 0x5a4d) { /* MZ */ |
| 556 | printf("Checking candidate KernBase = 0x%016"PRIx64"\n", KernBase); |
| 557 | if (pe_check_pdb_name(KernBase, nt_start_addr, &vs, &rsds)) { |
| 558 | kernel_found = true; |
| 559 | break; |
| 560 | } |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | if (!kernel_found) { |
| 565 | eprintf("Failed to find NT kernel image\n"); |
| 566 | goto out_ps; |
| 567 | } |
| 568 | |
| 569 | printf("KernBase = 0x%016"PRIx64", signature is \'%.2s\'\n", KernBase, |
| 570 | (char *)nt_start_addr); |
| 571 | |
| 572 | pdb_url = g_strdup_printf("%s" |
| 573 | "%.08x%.04x%.04x" |
| 574 | "%.02x%.02x" |
| 575 | "%.02x%.02x" |
| 576 | "%.02x%.02x" |
| 577 | "%.02x%.02x%.01x" |
| 578 | "%s", |
| 579 | SYM_URL_BASE PDB_NAME "/", |
| 580 | rsds.guid.a, rsds.guid.b, rsds.guid.c, |
| 581 | rsds.guid.d[0], rsds.guid.d[1], |
| 582 | rsds.guid.e[0], rsds.guid.e[1], |
| 583 | rsds.guid.e[2], rsds.guid.e[3], |
| 584 | rsds.guid.e[4], rsds.guid.e[5], rsds.age, |
| 585 | "/" PDB_NAME); |
| 586 | |
| 587 | printf("PDB URL is %s\n", pdb_url); |
| 588 | |
| 589 | if (!download_url(PDB_NAME, pdb_url)) { |
| 590 | eprintf("Failed to download PDB file\n"); |
| 591 | goto out_ps; |
| 592 | } |
| 593 | |
| 594 | if (!pdb_init_from_file(PDB_NAME, &pdb)) { |
| 595 | eprintf("Failed to initialize PDB reader\n"); |
| 596 | goto out_pdb_file; |
| 597 | } |
| 598 | |
| 599 | if (!SYM_RESOLVE(KernBase, &pdb, KdDebuggerDataBlock) || |
| 600 | !SYM_RESOLVE(KernBase, &pdb, KdVersionBlock)) { |
| 601 | goto out_pdb; |
| 602 | } |
| 603 | |
| 604 | kdbg = get_kdbg(KernBase, &pdb, &vs, KdDebuggerDataBlock); |
| 605 | if (!kdbg) { |
| 606 | goto out_pdb; |
| 607 | } |
| 608 | |
| 609 | if (!fill_header(&header, &ps, &vs, KdDebuggerDataBlock, kdbg, |
| 610 | KdVersionBlock, qemu_elf.state_nr)) { |
| 611 | goto out_kdbg; |
| 612 | } |
| 613 | |
| 614 | fill_context(kdbg, &vs, &qemu_elf); |
| 615 | |
| 616 | if (!write_dump(&ps, &header, argv[2])) { |
| 617 | eprintf("Failed to save dump\n"); |
| 618 | goto out_kdbg; |
| 619 | } |
| 620 | |
| 621 | err = 0; |
| 622 | |
| 623 | out_kdbg: |
| 624 | g_free(kdbg); |
| 625 | out_pdb: |
| 626 | pdb_exit(&pdb); |
| 627 | out_pdb_file: |
| 628 | unlink(PDB_NAME); |
| 629 | out_ps: |
| 630 | pa_space_destroy(&ps); |
| 631 | QEMU_Elf_exit(&qemu_elf); |
| 632 | |
| 633 | return err; |
| 634 | } |