/*
* 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;
}
status_t
windows_kernel_symbol_to_address(
vmi_instance_t vmi,
const char *symbol,
addr_t *kernel_base_address,
addr_t *address)
{
status_t ret = VMI_FAILURE;
addr_t rva = 0;
windows_instance_t windows = vmi->os_data;
if (windows == NULL || !windows->ntoskrnl_va) {
goto exit;
}
dbprint(VMI_DEBUG_MISC, "--windows symbol lookup (%s)\n", symbol);
if (windows->sysmap) {
dbprint(VMI_DEBUG_MISC, "--trying kernel sysmap\n");
if (VMI_SUCCESS == windows_system_map_symbol_to_address(vmi, symbol, NULL, &rva)) {
*address = windows->ntoskrnl_va + rva;
dbprint(VMI_DEBUG_MISC, "--got symbol from kernel sysmap (%s --> 0x%.16"PRIx64").\n",
symbol, *address);
ret = VMI_SUCCESS;
goto success;
}
dbprint(VMI_DEBUG_MISC, "--kernel sysmap lookup failed\n");
}
if (VMI_SUCCESS == windows_kdbg_lookup(vmi, symbol, address)) {
dbprint(VMI_DEBUG_MISC, "--got symbol from kdbg (%s --> 0x%"PRIx64").\n", symbol, *address);
ret = VMI_SUCCESS;
goto success;
}
dbprint(VMI_DEBUG_MISC, "--kdbg lookup failed\n");
dbprint(VMI_DEBUG_MISC, "--trying kernel PE export table\n");
/* check exports */
if (VMI_SUCCESS == windows_export_to_rva(vmi, windows->ntoskrnl_va, 0, symbol, &rva)) {
*address = windows->ntoskrnl_va + rva;
dbprint(VMI_DEBUG_MISC, "--got symbol from PE export table (%s --> 0x%.16"PRIx64").\n",
symbol, *address);
ret = VMI_SUCCESS;
goto success;
}
dbprint(VMI_DEBUG_MISC, "--kernel PE export table failed\n");
goto exit;
success:
if (kernel_base_address) {
*kernel_base_address = windows->ntoskrnl_va;
}
exit:
return ret;
}
