static status_t
init_from_sysmap(vmi_instance_t vmi)
{
status_t ret = VMI_FAILURE;
windows_instance_t windows = vmi->os_data;
dbprint(VMI_DEBUG_MISC, "**Trying to init from sysmap\n");
reg_t kpcr = 0;
addr_t kpcr_rva = 0;
if(vmi->mode != VMI_FILE) {
if (vmi->page_mode == VMI_PM_IA32E) {
if (VMI_FAILURE == driver_get_vcpureg(vmi, &kpcr, GS_BASE, 0)) {
goto done;
}
} else if (vmi->page_mode == VMI_PM_LEGACY || vmi->page_mode == VMI_PM_PAE) {
if (VMI_FAILURE == driver_get_vcpureg(vmi, &kpcr, FS_BASE, 0)) {
goto done;
}
}
if (VMI_SUCCESS == windows_system_map_symbol_to_address(vmi, "KiInitialPCR", NULL, &kpcr_rva)) {
// If the sysmap has KiInitialPCR we have Win 7+
windows->ntoskrnl_va = kpcr - kpcr_rva;
windows->ntoskrnl = vmi_translate_kv2p(vmi, windows->ntoskrnl_va);
} else if(kpcr == 0x00000000ffdff000) {
// If we are in live mode without KiInitialPCR, the KPCR has to be
// at this VA (XP/Vista) and the KPCR trick [1] is still valid.
// [1] http://moyix.blogspot.de/2008/04/finding-kernel-global-variables-in.html
addr_t kdvb = 0, kdvb_offset = 0, kernbase_offset = 0;
windows_system_map_symbol_to_address(vmi, "_KPCR", "KdVersionBlock", &kdvb_offset);
windows_system_map_symbol_to_address(vmi, "_DBGKD_GET_VERSION64", "KernBase", &kernbase_offset);
vmi_read_addr_va(vmi, kpcr+kdvb_offset, 0, &kdvb);
vmi_read_addr_va(vmi, kdvb+kernbase_offset, 0, &windows->ntoskrnl_va);
windows->ntoskrnl = vmi_translate_kv2p(vmi, windows->ntoskrnl_va);
} else {
goto done;
}
dbprint(VMI_DEBUG_MISC, "**KernBase PA=0x%"PRIx64"\n", windows->ntoskrnl);
}
// This could happen if we are in file mode or for Win XP
if (!windows->ntoskrnl) {
windows->ntoskrnl = get_ntoskrnl_base(vmi, vmi->kpgd);
// get KdVersionBlock/"_DBGKD_GET_VERSION64"->KernBase
addr_t kdvb = 0, kernbase_offset = 0;
windows_system_map_symbol_to_address(vmi, "KdVersionBlock", NULL, &kdvb);
windows_system_map_symbol_to_address(vmi, "_DBGKD_GET_VERSION64", "KernBase", &kernbase_offset);
dbprint(VMI_DEBUG_MISC, "**KdVersionBlock RVA 0x%lx. KernBase RVA: 0x%lx\n", kdvb, kernbase_offset);
dbprint(VMI_DEBUG_MISC, "**KernBase PA=0x%"PRIx64"\n", windows->ntoskrnl);
if (windows->ntoskrnl && kdvb && kernbase_offset) {
vmi_read_addr_pa(vmi, windows->ntoskrnl + kdvb + kernbase_offset, &windows->ntoskrnl_va);
if(!windows->ntoskrnl_va) {
vmi_read_32_pa(vmi, windows->ntoskrnl + kdvb + kernbase_offset, (uint32_t*)&windows->ntoskrnl_va);
}
if(!windows->ntoskrnl_va) {
dbprint(VMI_DEBUG_MISC, "**failed to find Windows kernel VA via KdVersionBlock\n");
goto done;
}
} else {
dbprint(VMI_DEBUG_MISC, "**Failed to find required offsets and/or kernel base PA\n");
goto done;
}
}
dbprint(VMI_DEBUG_MISC, "**KernBase VA=0x%"PRIx64"\n", windows->ntoskrnl_va);
addr_t ntbuildnumber_rva;
uint16_t ntbuildnumber = 0;
// Let's do some sanity checking
if (VMI_FAILURE == windows_system_map_symbol_to_address(vmi, "NtBuildNumber", NULL, &ntbuildnumber_rva)) {
goto done;
}
if (VMI_FAILURE == vmi_read_16_pa(vmi, windows->ntoskrnl + ntbuildnumber_rva, &ntbuildnumber)) {
goto done;
}
if (ntbuild2version(ntbuildnumber) == VMI_OS_WINDOWS_UNKNOWN) {
dbprint(VMI_DEBUG_MISC, "Unknown Windows NtBuildNumber: %u. The Rekall Profile may be incorrect for this Windows!\n", ntbuildnumber);
goto done;
}
// The system map seems to be good, lets grab all the required offsets
if(!windows->pdbase_offset) {
if (VMI_FAILURE == windows_system_map_symbol_to_address(vmi, "_KPROCESS", "DirectoryTableBase", &windows->pdbase_offset)) {
goto done;
}
}
if(!windows->tasks_offset) {
if (VMI_FAILURE == windows_system_map_symbol_to_address(vmi, "_EPROCESS", "ActiveProcessLinks", &windows->tasks_offset)) {
goto done;
}
}
if(!windows->pid_offset) {
if (VMI_FAILURE == windows_system_map_symbol_to_address(vmi, "_EPROCESS", "UniqueProcessId", &windows->pid_offset)) {
goto done;
}
}
if(!windows->pname_offset) {
if (VMI_FAILURE == windows_system_map_symbol_to_address(vmi, "_EPROCESS", "ImageFileName", &windows->pname_offset)) {
goto done;
}
}
ret = VMI_SUCCESS;
dbprint(VMI_DEBUG_MISC, "**init from sysmap success\n");
done: return ret;
}
static status_t
init_from_rekall_profile(vmi_instance_t vmi)
{
status_t ret = VMI_FAILURE;
windows_instance_t windows = vmi->os_data;
dbprint(VMI_DEBUG_MISC, "**Trying to init from Rekall profile\n");
reg_t kpcr = 0;
addr_t kpcr_rva = 0;
// try to find the kernel if we are not connecting to a file and the kernel pa/va were not already specified.
if(vmi->mode != VMI_FILE && ! ( windows->ntoskrnl && windows->ntoskrnl_va ) ) {
switch ( vmi->page_mode ) {
case VMI_PM_IA32E:
if (VMI_FAILURE == driver_get_vcpureg(vmi, &kpcr, GS_BASE, 0))
goto done;
break;
case VMI_PM_LEGACY: /* Fall-through */
case VMI_PM_PAE:
if (VMI_FAILURE == driver_get_vcpureg(vmi, &kpcr, FS_BASE, 0))
goto done;
break;
default:
goto done;
};
if (VMI_SUCCESS == rekall_profile_symbol_to_rva(windows->rekall_profile, "KiInitialPCR", NULL, &kpcr_rva)) {
if ( kpcr <= kpcr_rva || vmi->page_mode == VMI_PM_IA32E && kpcr < 0xffff800000000000 ) {
dbprint(VMI_DEBUG_MISC, "**vCPU0 doesn't seem to have KiInitialPCR mapped, can't init from Rekall profile.\n");
goto done;
}
// If the Rekall profile has KiInitialPCR we have Win 7+
windows->ntoskrnl_va = kpcr - kpcr_rva;
windows->ntoskrnl = vmi_translate_kv2p(vmi, windows->ntoskrnl_va);
} else if(kpcr == 0x00000000ffdff000) {
// If we are in live mode without KiInitialPCR, the KPCR has to be
// at this VA (XP/Vista) and the KPCR trick [1] is still valid.
// [1] http://moyix.blogspot.de/2008/04/finding-kernel-global-variables-in.html
addr_t kdvb = 0, kdvb_offset = 0, kernbase_offset = 0;
rekall_profile_symbol_to_rva(windows->rekall_profile, "_KPCR", "KdVersionBlock", &kdvb_offset);
rekall_profile_symbol_to_rva(windows->rekall_profile, "_DBGKD_GET_VERSION64", "KernBase", &kernbase_offset);
vmi_read_addr_va(vmi, kpcr+kdvb_offset, 0, &kdvb);
vmi_read_addr_va(vmi, kdvb+kernbase_offset, 0, &windows->ntoskrnl_va);
windows->ntoskrnl = vmi_translate_kv2p(vmi, windows->ntoskrnl_va);
} else {
goto done;
}
dbprint(VMI_DEBUG_MISC, "**KernBase PA=0x%"PRIx64"\n", windows->ntoskrnl);
/*
* If the CR3 value points to a pagetable that hasn't been setup yet
* we need to resort to finding a valid pagetable the old fashioned way.
*/
if (windows->ntoskrnl_va && !windows->ntoskrnl)
{
windows_find_cr3(vmi);
windows->ntoskrnl = vmi_translate_kv2p(vmi, windows->ntoskrnl_va);
}
}
// This could happen if we are in file mode or for Win XP
if (!windows->ntoskrnl) {
windows->ntoskrnl = get_ntoskrnl_base(vmi, vmi->kpgd);
// get KdVersionBlock/"_DBGKD_GET_VERSION64"->KernBase
addr_t kdvb = 0, kernbase_offset = 0;
rekall_profile_symbol_to_rva(windows->rekall_profile, "KdVersionBlock", NULL, &kdvb);
rekall_profile_symbol_to_rva(windows->rekall_profile, "_DBGKD_GET_VERSION64", "KernBase", &kernbase_offset);
dbprint(VMI_DEBUG_MISC, "**KdVersionBlock RVA 0x%lx. KernBase RVA: 0x%lx\n", kdvb, kernbase_offset);
dbprint(VMI_DEBUG_MISC, "**KernBase PA=0x%"PRIx64"\n", windows->ntoskrnl);
if (windows->ntoskrnl && kdvb && kernbase_offset) {
vmi_read_addr_pa(vmi, windows->ntoskrnl + kdvb + kernbase_offset, &windows->ntoskrnl_va);
if(!windows->ntoskrnl_va) {
vmi_read_32_pa(vmi, windows->ntoskrnl + kdvb + kernbase_offset, (uint32_t*)&windows->ntoskrnl_va);
}
if(!windows->ntoskrnl_va) {
dbprint(VMI_DEBUG_MISC, "**failed to find Windows kernel VA via KdVersionBlock\n");
goto done;
}
} else {
dbprint(VMI_DEBUG_MISC, "**Failed to find required offsets and/or kernel base PA\n");
goto done;
}
}
dbprint(VMI_DEBUG_MISC, "**KernBase VA=0x%"PRIx64"\n", windows->ntoskrnl_va);
addr_t ntbuildnumber_rva;
uint16_t ntbuildnumber = 0;
// Let's do some sanity checking
if (VMI_FAILURE == rekall_profile_symbol_to_rva(windows->rekall_profile, "NtBuildNumber", NULL, &ntbuildnumber_rva)) {
goto done;
}
if (VMI_FAILURE == vmi_read_16_pa(vmi, windows->ntoskrnl + ntbuildnumber_rva, &ntbuildnumber)) {
goto done;
}
if (ntbuild2version(ntbuildnumber) == VMI_OS_WINDOWS_UNKNOWN) {
dbprint(VMI_DEBUG_MISC, "Unknown Windows NtBuildNumber: %u, the Rekall Profile may be incorrect for this Windows!\n", ntbuildnumber);
}
// The system map seems to be good, lets grab all the required offsets
if(!windows->pdbase_offset) {
if (VMI_FAILURE == rekall_profile_symbol_to_rva(windows->rekall_profile, "_KPROCESS", "DirectoryTableBase", &windows->pdbase_offset)) {
goto done;
}
}
if(!windows->tasks_offset) {
if (VMI_FAILURE == rekall_profile_symbol_to_rva(windows->rekall_profile, "_EPROCESS", "ActiveProcessLinks", &windows->tasks_offset)) {
goto done;
}
}
if(!windows->pid_offset) {
if (VMI_FAILURE == rekall_profile_symbol_to_rva(windows->rekall_profile, "_EPROCESS", "UniqueProcessId", &windows->pid_offset)) {
goto done;
}
}
if(!windows->pname_offset) {
if (VMI_FAILURE == rekall_profile_symbol_to_rva(windows->rekall_profile, "_EPROCESS", "ImageFileName", &windows->pname_offset)) {
goto done;
}
}
ret = VMI_SUCCESS;
dbprint(VMI_DEBUG_MISC, "**init from Rekall profile success\n");
done: return ret;
}
/*
* This functions is responsible for setting up
* Windows specific variables:
* - ntoskrnl (*)
* - ntoskrnl_va (*)
* - kdbg_offset (*)
* - kdbg_va (*)
* The variables marked with (*) can be also specified
* in the libvmi config.
*/
status_t
init_from_kdbg(
vmi_instance_t vmi)
{
status_t ret = VMI_FAILURE;
addr_t kernbase_pa = 0;
addr_t kernbase_va = 0;
addr_t kdbg_pa = 0;
if (vmi->os_data == NULL) {
goto exit;
}
windows_instance_t windows = vmi->os_data;
/* If all 3 values are specified in the config, we can calculate ntoskrnl_va,
* but can't verify if there is no arch for doing translations.
*/
if (windows->kdbg_va && windows->kdbg_offset && windows->ntoskrnl
&& !vmi->arch_interface) {
/* All values were user specified, so set them, but we can't use
* translations to verify them */
windows->ntoskrnl_va = windows->kdbg_va - windows->kdbg_offset;
goto done;
}
if (!vmi->arch_interface) {
/* nothing that requires a virtual-to-physical translation will work
* so skip straight to the physical only methods. */
goto find_kdbg;
}
/* Otherwise, look up what we need and check for consistency */
if (windows->kdbg_va) {
dbprint(VMI_DEBUG_MISC, "**using KdDebuggerDataBlock address=0x%"PRIx64" from config\n",
windows->kdbg_va);
if (VMI_SUCCESS != windows_kdbg_lookup(vmi, "KernBase", &windows->ntoskrnl_va)) {
dbprint(VMI_DEBUG_MISC, "**Error reading KernBase value, falling back to search methods\n");
goto find_kdbg;
}
dbprint(VMI_DEBUG_MISC, "**KernBase VA=0x%"PRIx64"\n", windows->ntoskrnl_va);
if (windows->kdbg_offset) {
/* only needed ntoskrnl_va, verify the other values */
if (windows->kdbg_va != (windows->ntoskrnl_va + windows->kdbg_offset)) {
errprint("Invalid configuration values for win_kdvb and win_kdbg\n");
goto exit;
}
} else {
windows->kdbg_offset = windows->kdbg_va - windows->ntoskrnl_va;
}
} else if (windows->ntoskrnl && windows->kdbg_offset) {
/* Calculate ntoskrnl_va and kdbg_va */
unsigned long offset = 0;
kdbg_symbol_offset("KernBase", &offset);
if (VMI_FAILURE == vmi_read_addr_pa(vmi, windows->ntoskrnl + windows->kdbg_offset + offset, &windows->ntoskrnl_va)) {
errprint("Inconsistent addresses passed in the config!\n");
goto exit;
}
dbprint(VMI_DEBUG_MISC, "**KernBase VA=0x%"PRIx64"\n", windows->ntoskrnl_va);
windows->kdbg_va = windows->ntoskrnl_va - windows->kdbg_offset;
dbprint(VMI_DEBUG_MISC, "**set KdDebuggerDataBlock address=0x%"PRIx64"\n",
windows->kdbg_va);
} else {
/* only ntoskrnl or kdbg_offset were given, which are not
* enough to find and calculate the others, so fall back to search methods. */
goto find_kdbg;
}
addr_t test = 0;
if (!windows->ntoskrnl) {
if ( VMI_FAILURE == vmi_translate_kv2p(vmi, windows->ntoskrnl_va, &windows->ntoskrnl) )
goto find_kdbg;
dbprint(VMI_DEBUG_MISC, "**set KernBase PA=0x%"PRIx64"\n", windows->ntoskrnl);
} else if (VMI_FAILURE == vmi_translate_kv2p(vmi, windows->ntoskrnl_va, &test) || test != windows->ntoskrnl) {
errprint("Invalid configuration values, win_ntoskrnl not match translated KernBase physical address\n");
goto exit;
}
goto done;
// We don't have the standard config informations
// so lets try our kdbg search method
find_kdbg:
dbprint(VMI_DEBUG_MISC, "**Attempting KdDebuggerDataBlock search methods\n");
if (VMI_SUCCESS == find_kdbg_address_instant(vmi, &kdbg_pa, &kernbase_pa, &kernbase_va)) {
goto found;
}
if (VMI_SUCCESS == find_kdbg_address_faster(vmi, &kdbg_pa, &kernbase_pa, &kernbase_va)) {
goto found;
}
if (VMI_SUCCESS == find_kdbg_address_fast(vmi, &kdbg_pa, &kernbase_pa, &kernbase_va)) {
goto found;
}
/* NOTE: This is the only method that does anything for VMI_FILE */
if (VMI_SUCCESS == find_kdbg_address(vmi, &kdbg_pa, &kernbase_va)) {
kernbase_pa = get_ntoskrnl_base(vmi, 0);
goto found;
}
dbprint(VMI_DEBUG_MISC, "**All KdDebuggerDataBlock search methods failed\n");
goto exit;
found:
windows->ntoskrnl_va = kernbase_va;
dbprint(VMI_DEBUG_MISC, "**set KernBase VA=0x%"PRIx64"\n", windows->ntoskrnl_va);
if (!windows->ntoskrnl) {
windows->ntoskrnl = kernbase_pa;
printf("LibVMI Suggestion: set win_ntoskrnl=0x%"PRIx64" in libvmi.conf for faster startup.\n",
windows->ntoskrnl);
} else if (windows->ntoskrnl != kernbase_pa) {
errprint("LibVMI found physical kernel base address 0x%"PRIx64" that conflicts with provided value from config file!\n",
kernbase_pa);
goto exit;
}
if (!windows->kdbg_offset) {
windows->kdbg_offset = kdbg_pa - windows->ntoskrnl;
printf("LibVMI Suggestion: set win_kdbg=0x%"PRIx64" in libvmi.conf for faster startup.\n",
windows->kdbg_offset);
} else if (windows->kdbg_offset != kdbg_pa - kernbase_pa) {
errprint("LibVMI found win_kdbg offset 0x%"PRIx64" that conflicts with provided value from config file!\n",
kdbg_pa - kernbase_pa);
goto exit;
}
if (!windows->kdbg_va) {
windows->kdbg_va = windows->ntoskrnl_va + windows->kdbg_offset;
printf("LibVMI Suggestion: set win_kdvb=0x%"PRIx64" in libvmi.conf for faster startup.\n",
windows->kdbg_va);
} else if (windows->kdbg_va != windows->ntoskrnl_va + windows->kdbg_offset) {
errprint("LibVMI found win_kdvb offset 0x%"PRIx64" that conflicts with provided value from config file!\n",
windows->ntoskrnl_va + windows->kdbg_offset);
goto exit;
}
done:
if (!kdbg_pa) {
kdbg_pa = windows->ntoskrnl + windows->kdbg_offset;
}
windows->version = find_windows_version(vmi, kdbg_pa);
if (VMI_OS_WINDOWS_UNKNOWN == windows->version) {
errprint("Unsupported Windows version or incorrect configuration\n");
}
ret = VMI_SUCCESS;
exit:
return ret;
}
