470 lines
14 KiB
C
470 lines
14 KiB
C
/*
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* Windows crashdump
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*
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* Copyright (c) 2018 Virtuozzo International GmbH
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/cutils.h"
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#include "elf.h"
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#include "exec/hwaddr.h"
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#include "monitor/monitor.h"
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#include "sysemu/kvm.h"
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#include "sysemu/dump.h"
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#include "sysemu/memory_mapping.h"
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#include "sysemu/cpus.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/error-report.h"
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#include "hw/misc/vmcoreinfo.h"
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#include "win_dump.h"
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static size_t win_dump_ptr_size(bool x64)
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{
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return x64 ? sizeof(uint64_t) : sizeof(uint32_t);
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}
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#define _WIN_DUMP_FIELD(f) (x64 ? h->x64.f : h->x32.f)
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#define WIN_DUMP_FIELD(field) _WIN_DUMP_FIELD(field)
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#define _WIN_DUMP_FIELD_PTR(f) (x64 ? (void *)&h->x64.f : (void *)&h->x32.f)
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#define WIN_DUMP_FIELD_PTR(field) _WIN_DUMP_FIELD_PTR(field)
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#define _WIN_DUMP_FIELD_SIZE(f) (x64 ? sizeof(h->x64.f) : sizeof(h->x32.f))
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#define WIN_DUMP_FIELD_SIZE(field) _WIN_DUMP_FIELD_SIZE(field)
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static size_t win_dump_ctx_size(bool x64)
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{
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return x64 ? sizeof(WinContext64) : sizeof(WinContext32);
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}
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static size_t write_run(uint64_t base_page, uint64_t page_count,
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int fd, Error **errp)
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{
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void *buf;
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uint64_t addr = base_page << TARGET_PAGE_BITS;
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uint64_t size = page_count << TARGET_PAGE_BITS;
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uint64_t len, l;
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size_t total = 0;
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while (size) {
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len = size;
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buf = cpu_physical_memory_map(addr, &len, false);
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if (!buf) {
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error_setg(errp, "win-dump: failed to map physical range"
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" 0x%016" PRIx64 "-0x%016" PRIx64, addr, addr + size - 1);
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return 0;
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}
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l = qemu_write_full(fd, buf, len);
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cpu_physical_memory_unmap(buf, addr, false, len);
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if (l != len) {
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error_setg(errp, QERR_IO_ERROR);
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return 0;
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}
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addr += l;
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size -= l;
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total += l;
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}
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return total;
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}
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static void write_runs(DumpState *s, WinDumpHeader *h, bool x64, Error **errp)
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{
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uint64_t BasePage, PageCount;
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Error *local_err = NULL;
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int i;
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for (i = 0; i < WIN_DUMP_FIELD(PhysicalMemoryBlock.NumberOfRuns); i++) {
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BasePage = WIN_DUMP_FIELD(PhysicalMemoryBlock.Run[i].BasePage);
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PageCount = WIN_DUMP_FIELD(PhysicalMemoryBlock.Run[i].PageCount);
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s->written_size += write_run(BasePage, PageCount, s->fd, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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}
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}
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static int cpu_read_ptr(bool x64, CPUState *cpu, uint64_t addr, uint64_t *ptr)
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{
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int ret;
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uint32_t ptr32;
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uint64_t ptr64;
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ret = cpu_memory_rw_debug(cpu, addr, x64 ? (void *)&ptr64 : (void *)&ptr32,
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win_dump_ptr_size(x64), 0);
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*ptr = x64 ? ptr64 : ptr32;
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return ret;
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}
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static void patch_mm_pfn_database(WinDumpHeader *h, bool x64, Error **errp)
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{
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if (cpu_memory_rw_debug(first_cpu,
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WIN_DUMP_FIELD(KdDebuggerDataBlock) + KDBG_MM_PFN_DATABASE_OFFSET,
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WIN_DUMP_FIELD_PTR(PfnDatabase),
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WIN_DUMP_FIELD_SIZE(PfnDatabase), 0)) {
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error_setg(errp, "win-dump: failed to read MmPfnDatabase");
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return;
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}
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}
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static void patch_bugcheck_data(WinDumpHeader *h, bool x64, Error **errp)
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{
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uint64_t KiBugcheckData;
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if (cpu_read_ptr(x64, first_cpu,
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WIN_DUMP_FIELD(KdDebuggerDataBlock) + KDBG_KI_BUGCHECK_DATA_OFFSET,
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&KiBugcheckData)) {
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error_setg(errp, "win-dump: failed to read KiBugcheckData");
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return;
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}
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if (cpu_memory_rw_debug(first_cpu, KiBugcheckData,
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WIN_DUMP_FIELD(BugcheckData),
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WIN_DUMP_FIELD_SIZE(BugcheckData), 0)) {
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error_setg(errp, "win-dump: failed to read bugcheck data");
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return;
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}
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/*
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* If BugcheckCode wasn't saved, we consider guest OS as alive.
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*/
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if (!WIN_DUMP_FIELD(BugcheckCode)) {
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*(uint32_t *)WIN_DUMP_FIELD_PTR(BugcheckCode) = LIVE_SYSTEM_DUMP;
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}
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}
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/*
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* This routine tries to correct mistakes in crashdump header.
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*/
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static void patch_header(WinDumpHeader *h, bool x64)
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{
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Error *local_err = NULL;
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if (x64) {
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h->x64.RequiredDumpSpace = sizeof(WinDumpHeader64) +
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(h->x64.PhysicalMemoryBlock.NumberOfPages << TARGET_PAGE_BITS);
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h->x64.PhysicalMemoryBlock.unused = 0;
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h->x64.unused1 = 0;
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} else {
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h->x32.RequiredDumpSpace = sizeof(WinDumpHeader32) +
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(h->x32.PhysicalMemoryBlock.NumberOfPages << TARGET_PAGE_BITS);
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}
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patch_mm_pfn_database(h, x64, &local_err);
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if (local_err) {
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warn_report_err(local_err);
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local_err = NULL;
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}
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patch_bugcheck_data(h, x64, &local_err);
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if (local_err) {
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warn_report_err(local_err);
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}
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}
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static bool check_header(WinDumpHeader *h, bool *x64, Error **errp)
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{
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const char Signature[] = "PAGE";
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if (memcmp(h->Signature, Signature, sizeof(h->Signature))) {
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error_setg(errp, "win-dump: invalid header, expected '%.4s',"
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" got '%.4s'", Signature, h->Signature);
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return false;
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}
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if (!memcmp(h->ValidDump, "DUMP", sizeof(h->ValidDump))) {
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*x64 = false;
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} else if (!memcmp(h->ValidDump, "DU64", sizeof(h->ValidDump))) {
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*x64 = true;
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} else {
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error_setg(errp, "win-dump: invalid header, expected 'DUMP' or 'DU64',"
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" got '%.4s'", h->ValidDump);
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return false;
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}
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return true;
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}
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static void check_kdbg(WinDumpHeader *h, bool x64, Error **errp)
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{
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const char OwnerTag[] = "KDBG";
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char read_OwnerTag[4];
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uint64_t KdDebuggerDataBlock = WIN_DUMP_FIELD(KdDebuggerDataBlock);
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bool try_fallback = true;
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try_again:
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if (cpu_memory_rw_debug(first_cpu,
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KdDebuggerDataBlock + KDBG_OWNER_TAG_OFFSET,
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(uint8_t *)&read_OwnerTag, sizeof(read_OwnerTag), 0)) {
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error_setg(errp, "win-dump: failed to read OwnerTag");
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return;
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}
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if (memcmp(read_OwnerTag, OwnerTag, sizeof(read_OwnerTag))) {
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if (try_fallback) {
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/*
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* If attempt to use original KDBG failed
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* (most likely because of its encryption),
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* we try to use KDBG obtained by guest driver.
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*/
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KdDebuggerDataBlock = WIN_DUMP_FIELD(BugcheckParameter1);
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try_fallback = false;
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goto try_again;
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} else {
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error_setg(errp, "win-dump: invalid KDBG OwnerTag,"
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" expected '%.4s', got '%.4s'",
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OwnerTag, read_OwnerTag);
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return;
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}
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}
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if (x64) {
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h->x64.KdDebuggerDataBlock = KdDebuggerDataBlock;
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} else {
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h->x32.KdDebuggerDataBlock = KdDebuggerDataBlock;
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}
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}
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struct saved_context {
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WinContext ctx;
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uint64_t addr;
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};
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static void patch_and_save_context(WinDumpHeader *h, bool x64,
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struct saved_context *saved_ctx,
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Error **errp)
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{
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uint64_t KdDebuggerDataBlock = WIN_DUMP_FIELD(KdDebuggerDataBlock);
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uint64_t KiProcessorBlock;
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uint16_t OffsetPrcbContext;
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CPUState *cpu;
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int i = 0;
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if (cpu_read_ptr(x64, first_cpu,
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KdDebuggerDataBlock + KDBG_KI_PROCESSOR_BLOCK_OFFSET,
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&KiProcessorBlock)) {
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error_setg(errp, "win-dump: failed to read KiProcessorBlock");
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return;
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}
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if (cpu_memory_rw_debug(first_cpu,
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KdDebuggerDataBlock + KDBG_OFFSET_PRCB_CONTEXT_OFFSET,
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(uint8_t *)&OffsetPrcbContext, sizeof(OffsetPrcbContext), 0)) {
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error_setg(errp, "win-dump: failed to read OffsetPrcbContext");
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return;
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}
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CPU_FOREACH(cpu) {
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X86CPU *x86_cpu = X86_CPU(cpu);
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CPUX86State *env = &x86_cpu->env;
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uint64_t Prcb;
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uint64_t Context;
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WinContext ctx;
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if (cpu_read_ptr(x64, first_cpu,
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KiProcessorBlock + i * win_dump_ptr_size(x64),
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&Prcb)) {
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error_setg(errp, "win-dump: failed to read"
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" CPU #%d PRCB location", i);
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return;
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}
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if (cpu_read_ptr(x64, first_cpu,
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Prcb + OffsetPrcbContext,
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&Context)) {
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error_setg(errp, "win-dump: failed to read"
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" CPU #%d ContextFrame location", i);
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return;
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}
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saved_ctx[i].addr = Context;
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if (x64) {
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ctx.x64 = (WinContext64){
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.ContextFlags = WIN_CTX64_ALL,
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.MxCsr = env->mxcsr,
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.SegEs = env->segs[0].selector,
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.SegCs = env->segs[1].selector,
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.SegSs = env->segs[2].selector,
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.SegDs = env->segs[3].selector,
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.SegFs = env->segs[4].selector,
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.SegGs = env->segs[5].selector,
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.EFlags = cpu_compute_eflags(env),
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.Dr0 = env->dr[0],
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.Dr1 = env->dr[1],
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.Dr2 = env->dr[2],
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.Dr3 = env->dr[3],
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.Dr6 = env->dr[6],
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.Dr7 = env->dr[7],
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.Rax = env->regs[R_EAX],
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.Rbx = env->regs[R_EBX],
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.Rcx = env->regs[R_ECX],
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.Rdx = env->regs[R_EDX],
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.Rsp = env->regs[R_ESP],
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.Rbp = env->regs[R_EBP],
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.Rsi = env->regs[R_ESI],
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.Rdi = env->regs[R_EDI],
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.R8 = env->regs[8],
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.R9 = env->regs[9],
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.R10 = env->regs[10],
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.R11 = env->regs[11],
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.R12 = env->regs[12],
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.R13 = env->regs[13],
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.R14 = env->regs[14],
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.R15 = env->regs[15],
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.Rip = env->eip,
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.FltSave = {
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.MxCsr = env->mxcsr,
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},
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};
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} else {
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ctx.x32 = (WinContext32){
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.ContextFlags = WIN_CTX32_FULL | WIN_CTX_DBG,
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.SegEs = env->segs[0].selector,
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.SegCs = env->segs[1].selector,
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.SegSs = env->segs[2].selector,
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.SegDs = env->segs[3].selector,
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.SegFs = env->segs[4].selector,
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.SegGs = env->segs[5].selector,
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.EFlags = cpu_compute_eflags(env),
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.Dr0 = env->dr[0],
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.Dr1 = env->dr[1],
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.Dr2 = env->dr[2],
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.Dr3 = env->dr[3],
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.Dr6 = env->dr[6],
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.Dr7 = env->dr[7],
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.Eax = env->regs[R_EAX],
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.Ebx = env->regs[R_EBX],
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.Ecx = env->regs[R_ECX],
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.Edx = env->regs[R_EDX],
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.Esp = env->regs[R_ESP],
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.Ebp = env->regs[R_EBP],
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.Esi = env->regs[R_ESI],
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.Edi = env->regs[R_EDI],
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.Eip = env->eip,
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};
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}
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if (cpu_memory_rw_debug(first_cpu, Context,
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&saved_ctx[i].ctx, win_dump_ctx_size(x64), 0)) {
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error_setg(errp, "win-dump: failed to save CPU #%d context", i);
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return;
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}
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if (cpu_memory_rw_debug(first_cpu, Context,
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&ctx, win_dump_ctx_size(x64), 1)) {
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error_setg(errp, "win-dump: failed to write CPU #%d context", i);
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return;
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}
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i++;
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}
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}
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static void restore_context(WinDumpHeader *h, bool x64,
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struct saved_context *saved_ctx)
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{
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int i;
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for (i = 0; i < WIN_DUMP_FIELD(NumberProcessors); i++) {
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if (cpu_memory_rw_debug(first_cpu, saved_ctx[i].addr,
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&saved_ctx[i].ctx, win_dump_ctx_size(x64), 1)) {
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warn_report("win-dump: failed to restore CPU #%d context", i);
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}
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}
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}
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void create_win_dump(DumpState *s, Error **errp)
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{
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WinDumpHeader *h = (void *)(s->guest_note + VMCOREINFO_ELF_NOTE_HDR_SIZE);
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X86CPU *first_x86_cpu = X86_CPU(first_cpu);
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uint64_t saved_cr3 = first_x86_cpu->env.cr[3];
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struct saved_context *saved_ctx = NULL;
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Error *local_err = NULL;
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bool x64 = true;
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size_t hdr_size;
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if (s->guest_note_size != VMCOREINFO_WIN_DUMP_NOTE_SIZE32 &&
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s->guest_note_size != VMCOREINFO_WIN_DUMP_NOTE_SIZE64) {
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error_setg(errp, "win-dump: invalid vmcoreinfo note size");
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return;
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}
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if (!check_header(h, &x64, &local_err)) {
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error_propagate(errp, local_err);
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return;
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}
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hdr_size = x64 ? sizeof(WinDumpHeader64) : sizeof(WinDumpHeader32);
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/*
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* Further access to kernel structures by virtual addresses
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* should be made from system context.
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*/
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first_x86_cpu->env.cr[3] = WIN_DUMP_FIELD(DirectoryTableBase);
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check_kdbg(h, x64, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto out_cr3;
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}
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patch_header(h, x64);
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saved_ctx = g_new(struct saved_context, WIN_DUMP_FIELD(NumberProcessors));
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/*
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* Always patch context because there is no way
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* to determine if the system-saved context is valid
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*/
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patch_and_save_context(h, x64, saved_ctx, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto out_free;
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}
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s->total_size = WIN_DUMP_FIELD(RequiredDumpSpace);
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s->written_size = qemu_write_full(s->fd, h, hdr_size);
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if (s->written_size != hdr_size) {
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error_setg(errp, QERR_IO_ERROR);
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goto out_restore;
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}
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write_runs(s, h, x64, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto out_restore;
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}
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out_restore:
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restore_context(h, x64, saved_ctx);
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out_free:
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g_free(saved_ctx);
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out_cr3:
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first_x86_cpu->env.cr[3] = saved_cr3;
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return;
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}
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