Viktor Prutyanov | 3fa2d38 | 2018-08-29 15:41:25 +0300 | [diff] [blame] | 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 "err.h" |
| 10 | #include "addrspace.h" |
| 11 | #include "pe.h" |
| 12 | #include "pdb.h" |
| 13 | #include "kdbg.h" |
| 14 | #include "download.h" |
| 15 | #include "qemu/win_dump_defs.h" |
| 16 | |
| 17 | #define SYM_URL_BASE "https://msdl.microsoft.com/download/symbols/" |
| 18 | #define PDB_NAME "ntkrnlmp.pdb" |
| 19 | |
| 20 | #define INITIAL_MXCSR 0x1f80 |
| 21 | |
| 22 | typedef struct idt_desc { |
| 23 | uint16_t offset1; /* offset bits 0..15 */ |
| 24 | uint16_t selector; |
| 25 | uint8_t ist; |
| 26 | uint8_t type_attr; |
| 27 | uint16_t offset2; /* offset bits 16..31 */ |
| 28 | uint32_t offset3; /* offset bits 32..63 */ |
| 29 | uint32_t rsrvd; |
| 30 | } __attribute__ ((packed)) idt_desc_t; |
| 31 | |
| 32 | static uint64_t idt_desc_addr(idt_desc_t desc) |
| 33 | { |
| 34 | return (uint64_t)desc.offset1 | ((uint64_t)desc.offset2 << 16) | |
| 35 | ((uint64_t)desc.offset3 << 32); |
| 36 | } |
| 37 | |
| 38 | static const uint64_t SharedUserData = 0xfffff78000000000; |
| 39 | |
| 40 | #define KUSD_OFFSET_SUITE_MASK 0x2d0 |
| 41 | #define KUSD_OFFSET_PRODUCT_TYPE 0x264 |
| 42 | |
| 43 | #define SYM_RESOLVE(base, r, s) ((s = pdb_resolve(base, r, #s)),\ |
| 44 | s ? printf(#s" = 0x%016lx\n", s) : eprintf("Failed to resolve "#s"\n"), s) |
| 45 | |
| 46 | static uint64_t rol(uint64_t x, uint64_t y) |
| 47 | { |
| 48 | return (x << y) | (x >> (64 - y)); |
| 49 | } |
| 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 = rol(block ^ kwn, (uint8_t)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%016lx\n", kwn); |
| 102 | printf("[KiWaitAlways] = 0x%016lx\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 = malloc(kdbg_hdr.Size); |
| 120 | if (!kdbg) { |
| 121 | return NULL; |
| 122 | } |
| 123 | |
| 124 | if (va_space_rw(vs, KdDebuggerDataBlock, kdbg, kdbg_hdr.Size, 0)) { |
| 125 | eprintf("Failed to extract entire KDBG\n"); |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | if (!decode) { |
| 130 | return kdbg; |
| 131 | } |
| 132 | |
| 133 | printf("Decoding KdDebuggerDataBlock...\n"); |
| 134 | kdbg_decode((uint64_t *)kdbg, (uint64_t *)kdbg, kdbg_hdr.Size, |
| 135 | kwn, kwa, KdpDataBlockEncoded); |
| 136 | |
| 137 | va_space_rw(vs, KdDebuggerDataBlock, kdbg, kdbg_hdr.Size, 1); |
| 138 | |
| 139 | return kdbg; |
| 140 | } |
| 141 | |
| 142 | static void win_context_init_from_qemu_cpu_state(WinContext *ctx, |
| 143 | QEMUCPUState *s) |
| 144 | { |
| 145 | WinContext win_ctx = (WinContext){ |
| 146 | .ContextFlags = WIN_CTX_X64 | WIN_CTX_INT | WIN_CTX_SEG | WIN_CTX_CTL, |
| 147 | .MxCsr = INITIAL_MXCSR, |
| 148 | |
| 149 | .SegCs = s->cs.selector, |
| 150 | .SegSs = s->ss.selector, |
| 151 | .SegDs = s->ds.selector, |
| 152 | .SegEs = s->es.selector, |
| 153 | .SegFs = s->fs.selector, |
| 154 | .SegGs = s->gs.selector, |
| 155 | .EFlags = (uint32_t)s->rflags, |
| 156 | |
| 157 | .Rax = s->rax, |
| 158 | .Rbx = s->rbx, |
| 159 | .Rcx = s->rcx, |
| 160 | .Rdx = s->rdx, |
| 161 | .Rsp = s->rsp, |
| 162 | .Rbp = s->rbp, |
| 163 | .Rsi = s->rsi, |
| 164 | .Rdi = s->rdi, |
| 165 | .R8 = s->r8, |
| 166 | .R9 = s->r9, |
| 167 | .R10 = s->r10, |
| 168 | .R11 = s->r11, |
| 169 | .R12 = s->r12, |
| 170 | .R13 = s->r13, |
| 171 | .R14 = s->r14, |
| 172 | .R15 = s->r15, |
| 173 | |
| 174 | .Rip = s->rip, |
| 175 | .FltSave = { |
| 176 | .MxCsr = INITIAL_MXCSR, |
| 177 | }, |
| 178 | }; |
| 179 | |
| 180 | *ctx = win_ctx; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Finds paging-structure hierarchy base, |
| 185 | * if previously set doesn't give access to kernel structures |
| 186 | */ |
| 187 | static int fix_dtb(struct va_space *vs, QEMU_Elf *qe) |
| 188 | { |
| 189 | /* |
| 190 | * Firstly, test previously set DTB. |
| 191 | */ |
| 192 | if (va_space_resolve(vs, SharedUserData)) { |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | * Secondly, find CPU which run system task. |
| 198 | */ |
| 199 | size_t i; |
| 200 | for (i = 0; i < qe->state_nr; i++) { |
| 201 | QEMUCPUState *s = qe->state[i]; |
| 202 | |
| 203 | if (is_system(s)) { |
| 204 | va_space_set_dtb(vs, s->cr[3]); |
| 205 | printf("DTB 0x%016lx has been found from CPU #%zu" |
| 206 | " as system task CR3\n", vs->dtb, i); |
| 207 | return !(va_space_resolve(vs, SharedUserData)); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Thirdly, use KERNEL_GS_BASE from CPU #0 as PRCB address and |
| 213 | * CR3 as [Prcb+0x7000] |
| 214 | */ |
| 215 | if (qe->has_kernel_gs_base) { |
| 216 | QEMUCPUState *s = qe->state[0]; |
| 217 | uint64_t Prcb = s->kernel_gs_base; |
| 218 | uint64_t *cr3 = va_space_resolve(vs, Prcb + 0x7000); |
| 219 | |
| 220 | if (!cr3) { |
| 221 | return 1; |
| 222 | } |
| 223 | |
| 224 | va_space_set_dtb(vs, *cr3); |
| 225 | printf("DirectoryTableBase = 0x%016lx has been found from CPU #0" |
| 226 | " as interrupt handling CR3\n", vs->dtb); |
| 227 | return !(va_space_resolve(vs, SharedUserData)); |
| 228 | } |
| 229 | |
| 230 | return 1; |
| 231 | } |
| 232 | |
| 233 | static int fill_header(WinDumpHeader64 *hdr, struct pa_space *ps, |
| 234 | struct va_space *vs, uint64_t KdDebuggerDataBlock, |
| 235 | KDDEBUGGER_DATA64 *kdbg, uint64_t KdVersionBlock, int nr_cpus) |
| 236 | { |
| 237 | uint32_t *suite_mask = va_space_resolve(vs, SharedUserData + |
| 238 | KUSD_OFFSET_SUITE_MASK); |
| 239 | int32_t *product_type = va_space_resolve(vs, SharedUserData + |
| 240 | KUSD_OFFSET_PRODUCT_TYPE); |
| 241 | DBGKD_GET_VERSION64 kvb; |
| 242 | WinDumpHeader64 h; |
| 243 | size_t i; |
| 244 | |
| 245 | QEMU_BUILD_BUG_ON(KUSD_OFFSET_SUITE_MASK >= PAGE_SIZE); |
| 246 | QEMU_BUILD_BUG_ON(KUSD_OFFSET_PRODUCT_TYPE >= PAGE_SIZE); |
| 247 | |
| 248 | if (!suite_mask || !product_type) { |
| 249 | return 1; |
| 250 | } |
| 251 | |
| 252 | if (va_space_rw(vs, KdVersionBlock, &kvb, sizeof(kvb), 0)) { |
| 253 | eprintf("Failed to extract KdVersionBlock\n"); |
| 254 | return 1; |
| 255 | } |
| 256 | |
| 257 | h = (WinDumpHeader64) { |
| 258 | .Signature = "PAGE", |
| 259 | .ValidDump = "DU64", |
| 260 | .MajorVersion = kvb.MajorVersion, |
| 261 | .MinorVersion = kvb.MinorVersion, |
| 262 | .DirectoryTableBase = vs->dtb, |
| 263 | .PfnDatabase = kdbg->MmPfnDatabase, |
| 264 | .PsLoadedModuleList = kdbg->PsLoadedModuleList, |
| 265 | .PsActiveProcessHead = kdbg->PsActiveProcessHead, |
| 266 | .MachineImageType = kvb.MachineType, |
| 267 | .NumberProcessors = nr_cpus, |
| 268 | .BugcheckCode = LIVE_SYSTEM_DUMP, |
| 269 | .KdDebuggerDataBlock = KdDebuggerDataBlock, |
| 270 | .DumpType = 1, |
| 271 | .Comment = "Hello from elf2dmp!", |
| 272 | .SuiteMask = *suite_mask, |
| 273 | .ProductType = *product_type, |
| 274 | .SecondaryDataState = kvb.KdSecondaryVersion, |
| 275 | .PhysicalMemoryBlock = (WinDumpPhyMemDesc64) { |
| 276 | .NumberOfRuns = ps->block_nr, |
| 277 | }, |
| 278 | .RequiredDumpSpace = sizeof(h), |
| 279 | }; |
| 280 | |
| 281 | for (i = 0; i < ps->block_nr; i++) { |
| 282 | h.PhysicalMemoryBlock.NumberOfPages += ps->block[i].size / PAGE_SIZE; |
| 283 | h.PhysicalMemoryBlock.Run[i] = (WinDumpPhyMemRun64) { |
| 284 | .BasePage = ps->block[i].paddr / PAGE_SIZE, |
| 285 | .PageCount = ps->block[i].size / PAGE_SIZE, |
| 286 | }; |
| 287 | } |
| 288 | |
| 289 | h.RequiredDumpSpace += h.PhysicalMemoryBlock.NumberOfPages << PAGE_BITS; |
| 290 | |
| 291 | *hdr = h; |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static int fill_context(KDDEBUGGER_DATA64 *kdbg, |
| 297 | struct va_space *vs, QEMU_Elf *qe) |
| 298 | { |
| 299 | int i; |
| 300 | for (i = 0; i < qe->state_nr; i++) { |
| 301 | uint64_t Prcb; |
| 302 | uint64_t Context; |
| 303 | WinContext ctx; |
| 304 | QEMUCPUState *s = qe->state[i]; |
| 305 | |
| 306 | if (va_space_rw(vs, kdbg->KiProcessorBlock + sizeof(Prcb) * i, |
| 307 | &Prcb, sizeof(Prcb), 0)) { |
| 308 | eprintf("Failed to read CPU #%d PRCB location\n", i); |
| 309 | return 1; |
| 310 | } |
| 311 | |
| 312 | if (va_space_rw(vs, Prcb + kdbg->OffsetPrcbContext, |
| 313 | &Context, sizeof(Context), 0)) { |
| 314 | eprintf("Failed to read CPU #%d ContextFrame location\n", i); |
| 315 | return 1; |
| 316 | } |
| 317 | |
| 318 | printf("Filling context for CPU #%d...\n", i); |
| 319 | win_context_init_from_qemu_cpu_state(&ctx, s); |
| 320 | |
| 321 | if (va_space_rw(vs, Context, &ctx, sizeof(ctx), 1)) { |
| 322 | eprintf("Failed to fill CPU #%d context\n", i); |
| 323 | return 1; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | static int write_dump(struct pa_space *ps, |
| 331 | WinDumpHeader64 *hdr, const char *name) |
| 332 | { |
| 333 | FILE *dmp_file = fopen(name, "wb"); |
| 334 | size_t i; |
| 335 | |
| 336 | if (!dmp_file) { |
| 337 | eprintf("Failed to open output file \'%s\'\n", name); |
| 338 | return 1; |
| 339 | } |
| 340 | |
| 341 | printf("Writing header to file...\n"); |
| 342 | |
| 343 | if (fwrite(hdr, sizeof(*hdr), 1, dmp_file) != 1) { |
| 344 | eprintf("Failed to write dump header\n"); |
| 345 | fclose(dmp_file); |
| 346 | return 1; |
| 347 | } |
| 348 | |
| 349 | for (i = 0; i < ps->block_nr; i++) { |
| 350 | struct pa_block *b = &ps->block[i]; |
| 351 | |
| 352 | printf("Writing block #%zu/%zu to file...\n", i, ps->block_nr); |
| 353 | if (fwrite(b->addr, b->size, 1, dmp_file) != 1) { |
| 354 | eprintf("Failed to write dump header\n"); |
| 355 | fclose(dmp_file); |
| 356 | return 1; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | return fclose(dmp_file); |
| 361 | } |
| 362 | |
| 363 | static int pe_get_pdb_symstore_hash(uint64_t base, void *start_addr, |
| 364 | char *hash, struct va_space *vs) |
| 365 | { |
| 366 | const char e_magic[2] = "MZ"; |
| 367 | const char Signature[4] = "PE\0\0"; |
| 368 | const char sign_rsds[4] = "RSDS"; |
| 369 | IMAGE_DOS_HEADER *dos_hdr = start_addr; |
| 370 | IMAGE_NT_HEADERS64 nt_hdrs; |
| 371 | IMAGE_FILE_HEADER *file_hdr = &nt_hdrs.FileHeader; |
| 372 | IMAGE_OPTIONAL_HEADER64 *opt_hdr = &nt_hdrs.OptionalHeader; |
| 373 | IMAGE_DATA_DIRECTORY *data_dir = nt_hdrs.OptionalHeader.DataDirectory; |
| 374 | IMAGE_DEBUG_DIRECTORY debug_dir; |
| 375 | OMFSignatureRSDS rsds; |
| 376 | char *pdb_name; |
| 377 | size_t pdb_name_sz; |
| 378 | size_t i; |
| 379 | |
| 380 | QEMU_BUILD_BUG_ON(sizeof(*dos_hdr) >= PAGE_SIZE); |
| 381 | |
| 382 | if (memcmp(&dos_hdr->e_magic, e_magic, sizeof(e_magic))) { |
| 383 | return 1; |
| 384 | } |
| 385 | |
| 386 | if (va_space_rw(vs, base + dos_hdr->e_lfanew, |
| 387 | &nt_hdrs, sizeof(nt_hdrs), 0)) { |
| 388 | return 1; |
| 389 | } |
| 390 | |
| 391 | if (memcmp(&nt_hdrs.Signature, Signature, sizeof(Signature)) || |
| 392 | file_hdr->Machine != 0x8664 || opt_hdr->Magic != 0x020b) { |
| 393 | return 1; |
| 394 | } |
| 395 | |
| 396 | printf("Debug Directory RVA = 0x%016x\n", |
| 397 | data_dir[IMAGE_FILE_DEBUG_DIRECTORY].VirtualAddress); |
| 398 | |
| 399 | if (va_space_rw(vs, |
| 400 | base + data_dir[IMAGE_FILE_DEBUG_DIRECTORY].VirtualAddress, |
| 401 | &debug_dir, sizeof(debug_dir), 0)) { |
| 402 | return 1; |
| 403 | } |
| 404 | |
| 405 | if (debug_dir.Type != IMAGE_DEBUG_TYPE_CODEVIEW) { |
| 406 | return 1; |
| 407 | } |
| 408 | |
| 409 | if (va_space_rw(vs, |
| 410 | base + debug_dir.AddressOfRawData, |
| 411 | &rsds, sizeof(rsds), 0)) { |
| 412 | return 1; |
| 413 | } |
| 414 | |
| 415 | printf("CodeView signature is \'%.4s\'\n", rsds.Signature); |
| 416 | |
| 417 | if (memcmp(&rsds.Signature, sign_rsds, sizeof(sign_rsds))) { |
| 418 | return 1; |
| 419 | } |
| 420 | |
| 421 | pdb_name_sz = debug_dir.SizeOfData - sizeof(rsds); |
| 422 | pdb_name = malloc(pdb_name_sz); |
| 423 | if (!pdb_name) { |
| 424 | return 1; |
| 425 | } |
| 426 | |
| 427 | if (va_space_rw(vs, base + debug_dir.AddressOfRawData + |
| 428 | offsetof(OMFSignatureRSDS, name), pdb_name, pdb_name_sz, 0)) { |
| 429 | free(pdb_name); |
| 430 | return 1; |
| 431 | } |
| 432 | |
| 433 | printf("PDB name is \'%s\', \'%s\' expected\n", pdb_name, PDB_NAME); |
| 434 | |
| 435 | if (strcmp(pdb_name, PDB_NAME)) { |
| 436 | eprintf("Unexpected PDB name, it seems the kernel isn't found\n"); |
| 437 | free(pdb_name); |
| 438 | return 1; |
| 439 | } |
| 440 | |
| 441 | free(pdb_name); |
| 442 | |
| 443 | sprintf(hash, "%.08x%.04x%.04x%.02x%.02x", rsds.guid.a, rsds.guid.b, |
| 444 | rsds.guid.c, rsds.guid.d[0], rsds.guid.d[1]); |
| 445 | hash += 20; |
| 446 | for (i = 0; i < 6; i++, hash += 2) { |
| 447 | sprintf(hash, "%.02x", rsds.guid.e[i]); |
| 448 | } |
| 449 | |
| 450 | sprintf(hash, "%.01x", rsds.age); |
| 451 | |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | int main(int argc, char *argv[]) |
| 456 | { |
| 457 | int err = 0; |
| 458 | QEMU_Elf qemu_elf; |
| 459 | struct pa_space ps; |
| 460 | struct va_space vs; |
| 461 | QEMUCPUState *state; |
| 462 | idt_desc_t first_idt_desc; |
| 463 | uint64_t KernBase; |
| 464 | void *nt_start_addr = NULL; |
| 465 | WinDumpHeader64 header; |
| 466 | char pdb_hash[34]; |
| 467 | char pdb_url[] = SYM_URL_BASE PDB_NAME |
| 468 | "/0123456789ABCDEF0123456789ABCDEFx/" PDB_NAME; |
| 469 | struct pdb_reader pdb; |
| 470 | uint64_t KdDebuggerDataBlock; |
| 471 | KDDEBUGGER_DATA64 *kdbg; |
| 472 | uint64_t KdVersionBlock; |
| 473 | |
| 474 | if (argc != 3) { |
| 475 | eprintf("usage:\n\t%s elf_file dmp_file\n", argv[0]); |
| 476 | return 1; |
| 477 | } |
| 478 | |
| 479 | if (QEMU_Elf_init(&qemu_elf, argv[1])) { |
| 480 | eprintf("Failed to initialize QEMU ELF dump\n"); |
| 481 | return 1; |
| 482 | } |
| 483 | |
| 484 | if (pa_space_create(&ps, &qemu_elf)) { |
| 485 | eprintf("Failed to initialize physical address space\n"); |
| 486 | err = 1; |
| 487 | goto out_elf; |
| 488 | } |
| 489 | |
| 490 | state = qemu_elf.state[0]; |
| 491 | printf("CPU #0 CR3 is 0x%016lx\n", state->cr[3]); |
| 492 | |
| 493 | va_space_create(&vs, &ps, state->cr[3]); |
| 494 | if (fix_dtb(&vs, &qemu_elf)) { |
| 495 | eprintf("Failed to find paging base\n"); |
| 496 | err = 1; |
| 497 | goto out_elf; |
| 498 | } |
| 499 | |
| 500 | printf("CPU #0 IDT is at 0x%016lx\n", state->idt.base); |
| 501 | |
| 502 | if (va_space_rw(&vs, state->idt.base, |
| 503 | &first_idt_desc, sizeof(first_idt_desc), 0)) { |
| 504 | eprintf("Failed to get CPU #0 IDT[0]\n"); |
| 505 | err = 1; |
| 506 | goto out_ps; |
| 507 | } |
| 508 | printf("CPU #0 IDT[0] -> 0x%016lx\n", idt_desc_addr(first_idt_desc)); |
| 509 | |
| 510 | KernBase = idt_desc_addr(first_idt_desc) & ~(PAGE_SIZE - 1); |
| 511 | printf("Searching kernel downwards from 0x%16lx...\n", KernBase); |
| 512 | |
| 513 | for (; KernBase >= 0xfffff78000000000; KernBase -= PAGE_SIZE) { |
| 514 | nt_start_addr = va_space_resolve(&vs, KernBase); |
| 515 | if (!nt_start_addr) { |
| 516 | continue; |
| 517 | } |
| 518 | |
| 519 | if (*(uint16_t *)nt_start_addr == 0x5a4d) { /* MZ */ |
| 520 | break; |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | printf("KernBase = 0x%16lx, signature is \'%.2s\'\n", KernBase, |
| 525 | (char *)nt_start_addr); |
| 526 | |
| 527 | if (pe_get_pdb_symstore_hash(KernBase, nt_start_addr, pdb_hash, &vs)) { |
| 528 | eprintf("Failed to get PDB symbol store hash\n"); |
| 529 | err = 1; |
| 530 | goto out_ps; |
| 531 | } |
| 532 | |
| 533 | sprintf(pdb_url, "%s%s/%s/%s", SYM_URL_BASE, PDB_NAME, pdb_hash, PDB_NAME); |
| 534 | printf("PDB URL is %s\n", pdb_url); |
| 535 | |
| 536 | if (download_url(PDB_NAME, pdb_url)) { |
| 537 | eprintf("Failed to download PDB file\n"); |
| 538 | err = 1; |
| 539 | goto out_ps; |
| 540 | } |
| 541 | |
| 542 | if (pdb_init_from_file(PDB_NAME, &pdb)) { |
| 543 | eprintf("Failed to initialize PDB reader\n"); |
| 544 | err = 1; |
| 545 | goto out_pdb_file; |
| 546 | } |
| 547 | |
| 548 | if (!SYM_RESOLVE(KernBase, &pdb, KdDebuggerDataBlock) || |
| 549 | !SYM_RESOLVE(KernBase, &pdb, KdVersionBlock)) { |
| 550 | err = 1; |
| 551 | goto out_pdb; |
| 552 | } |
| 553 | |
| 554 | kdbg = get_kdbg(KernBase, &pdb, &vs, KdDebuggerDataBlock); |
| 555 | if (!kdbg) { |
| 556 | err = 1; |
| 557 | goto out_pdb; |
| 558 | } |
| 559 | |
| 560 | if (fill_header(&header, &ps, &vs, KdDebuggerDataBlock, kdbg, |
| 561 | KdVersionBlock, qemu_elf.state_nr)) { |
| 562 | err = 1; |
| 563 | goto out_pdb; |
| 564 | } |
| 565 | |
| 566 | if (fill_context(kdbg, &vs, &qemu_elf)) { |
| 567 | err = 1; |
| 568 | goto out_pdb; |
| 569 | } |
| 570 | |
| 571 | if (write_dump(&ps, &header, argv[2])) { |
| 572 | eprintf("Failed to save dump\n"); |
| 573 | err = 1; |
| 574 | goto out_kdbg; |
| 575 | } |
| 576 | |
| 577 | out_kdbg: |
| 578 | free(kdbg); |
| 579 | out_pdb: |
| 580 | pdb_exit(&pdb); |
| 581 | out_pdb_file: |
| 582 | unlink(PDB_NAME); |
| 583 | out_ps: |
| 584 | pa_space_destroy(&ps); |
| 585 | out_elf: |
| 586 | QEMU_Elf_exit(&qemu_elf); |
| 587 | |
| 588 | return err; |
| 589 | } |