from xnu import *
import xnudefines
from kdp import *
from utils import *
def ReadPhysInt(phys_addr, bitsize = 64, cpuval = None):
""" Read a physical memory data based on address.
params:
phys_addr : int - Physical address to read
bitsize : int - defines how many bytes to read. defaults to 64 bit
cpuval : None (optional)
returns:
int - int value read from memory. in case of failure 0xBAD10AD is returned.
"""
if "kdp" == GetConnectionProtocol():
return KDPReadPhysMEM(phys_addr, bitsize)
paddr_in_kva = kern.PhysToKernelVirt(long(phys_addr))
if paddr_in_kva :
if bitsize == 64 :
return kern.GetValueFromAddress(paddr_in_kva, 'uint64_t *').GetSBValue().Dereference().GetValueAsUnsigned()
if bitsize == 32 :
return kern.GetValueFromAddress(paddr_in_kva, 'uint32_t *').GetSBValue().Dereference().GetValueAsUnsigned()
if bitsize == 16 :
return kern.GetValueFromAddress(paddr_in_kva, 'uint16_t *').GetSBValue().Dereference().GetValueAsUnsigned()
if bitsize == 8 :
return kern.GetValueFromAddress(paddr_in_kva, 'uint8_t *').GetSBValue().Dereference().GetValueAsUnsigned()
return 0xBAD10AD
@lldb_command('readphys')
def ReadPhys(cmd_args = None):
""" Reads the specified untranslated address
The argument is interpreted as a physical address, and the 64-bit word
addressed is displayed.
usage: readphys <nbits> <address>
nbits: 8,16,32,64
address: 1234 or 0x1234
"""
if cmd_args == None or len(cmd_args) < 2:
print "Insufficient arguments.", ReadPhys.__doc__
return False
else:
nbits = ArgumentStringToInt(cmd_args[0])
phys_addr = ArgumentStringToInt(cmd_args[1])
print "{0: <#x}".format(ReadPhysInt(phys_addr, nbits))
return True
lldb_alias('readphys8', 'readphys 8 ')
lldb_alias('readphys16', 'readphys 16 ')
lldb_alias('readphys32', 'readphys 32 ')
lldb_alias('readphys64', 'readphys 64 ')
def KDPReadPhysMEM(address, bits):
""" Setup the state for READPHYSMEM64 commands for reading data via kdp
params:
address : int - address where to read the data from
bits : int - number of bits in the intval (8/16/32/64)
returns:
int: read value from memory.
0xBAD10AD: if failed to read data.
"""
retval = 0xBAD10AD
if "kdp" != GetConnectionProtocol():
print "Target is not connected over kdp. Nothing to do here."
return retval
input_address = unsigned(addressof(kern.globals.manual_pkt.input))
len_address = unsigned(addressof(kern.globals.manual_pkt.len))
data_address = unsigned(addressof(kern.globals.manual_pkt.data))
if not WriteInt32ToMemoryAddress(0, input_address):
return retval
kdp_pkt_size = GetType('kdp_readphysmem64_req_t').GetByteSize()
if not WriteInt32ToMemoryAddress(kdp_pkt_size, len_address):
return retval
data_addr = int(addressof(kern.globals.manual_pkt))
pkt = kern.GetValueFromAddress(data_addr, 'kdp_readphysmem64_req_t *')
header_value =GetKDPPacketHeaderInt(request=GetEnumValue('kdp_req_t::KDP_READPHYSMEM64'), length=kdp_pkt_size)
if ( WriteInt64ToMemoryAddress((header_value), int(addressof(pkt.hdr))) and
WriteInt64ToMemoryAddress(address, int(addressof(pkt.address))) and
WriteInt32ToMemoryAddress((bits/8), int(addressof(pkt.nbytes))) and
WriteInt16ToMemoryAddress(xnudefines.lcpu_self, int(addressof(pkt.lcpu)))
):
if WriteInt32ToMemoryAddress(1, input_address):
data_address = unsigned(addressof(kern.GetValueFromAddress(int(addressof(kern.globals.manual_pkt.data)), 'kdp_readphysmem64_reply_t *').data))
if bits == 64 :
retval = kern.GetValueFromAddress(data_address, 'uint64_t *').GetSBValue().Dereference().GetValueAsUnsigned()
if bits == 32 :
retval = kern.GetValueFromAddress(data_address, 'uint32_t *').GetSBValue().Dereference().GetValueAsUnsigned()
if bits == 16 :
retval = kern.GetValueFromAddress(data_address, 'uint16_t *').GetSBValue().Dereference().GetValueAsUnsigned()
if bits == 8 :
retval = kern.GetValueFromAddress(data_address, 'uint8_t *').GetSBValue().Dereference().GetValueAsUnsigned()
return retval
def KDPWritePhysMEM(address, intval, bits):
""" Setup the state for WRITEPHYSMEM64 commands for saving data in kdp
params:
address : int - address where to save the data
intval : int - integer value to be stored in memory
bits : int - number of bits in the intval (8/16/32/64)
returns:
boolean: True if the write succeeded.
"""
if "kdp" != GetConnectionProtocol():
print "Target is not connected over kdp. Nothing to do here."
return False
input_address = unsigned(addressof(kern.globals.manual_pkt.input))
len_address = unsigned(addressof(kern.globals.manual_pkt.len))
data_address = unsigned(addressof(kern.globals.manual_pkt.data))
if not WriteInt32ToMemoryAddress(0, input_address):
return False
kdp_pkt_size = GetType('kdp_writephysmem64_req_t').GetByteSize()
if not WriteInt32ToMemoryAddress(kdp_pkt_size, len_address):
return False
data_addr = int(addressof(kern.globals.manual_pkt))
pkt = kern.GetValueFromAddress(data_addr, 'kdp_writephysmem64_req_t *')
header_value =GetKDPPacketHeaderInt(request=GetEnumValue('kdp_req_t::KDP_WRITEPHYSMEM64'), length=kdp_pkt_size)
if ( WriteInt64ToMemoryAddress((header_value), int(addressof(pkt.hdr))) and
WriteInt64ToMemoryAddress(address, int(addressof(pkt.address))) and
WriteInt32ToMemoryAddress((bits/8), int(addressof(pkt.nbytes))) and
WriteInt16ToMemoryAddress(xnudefines.lcpu_self, int(addressof(pkt.lcpu)))
):
if bits == 8:
if not WriteInt8ToMemoryAddress(intval, int(addressof(pkt.data))):
return False
if bits == 16:
if not WriteInt16ToMemoryAddress(intval, int(addressof(pkt.data))):
return False
if bits == 32:
if not WriteInt32ToMemoryAddress(intval, int(addressof(pkt.data))):
return False
if bits == 64:
if not WriteInt64ToMemoryAddress(intval, int(addressof(pkt.data))):
return False
if WriteInt32ToMemoryAddress(1, input_address):
return True
return False
def WritePhysInt(phys_addr, int_val, bitsize = 64):
""" Write and integer value in a physical memory data based on address.
params:
phys_addr : int - Physical address to read
int_val : int - int value to write in memory
bitsize : int - defines how many bytes to read. defaults to 64 bit
returns:
bool - True if write was successful.
"""
if "kdp" == GetConnectionProtocol():
if not KDPWritePhysMEM(phys_addr, int_val, bitsize):
print "Failed to write via KDP."
return False
return True
print "Failed: Write to physical memory is not supported for %s connection." % GetConnectionProtocol()
return False
@lldb_command('writephys')
def WritePhys(cmd_args=None):
""" writes to the specified untranslated address
The argument is interpreted as a physical address, and the 64-bit word
addressed is displayed.
usage: writephys <nbits> <address> <value>
nbits: 8,16,32,64
address: 1234 or 0x1234
value: int value to be written
ex. (lldb)writephys 16 0x12345abcd 0x25
"""
if cmd_args == None or len(cmd_args) < 3:
print "Invalid arguments.", WritePhys.__doc__
else:
nbits = ArgumentStringToInt(cmd_args[0])
phys_addr = ArgumentStringToInt(cmd_args[1])
int_value = ArgumentStringToInt(cmd_args[2])
print WritePhysInt(phys_addr, int_value, nbits)
lldb_alias('writephys8', 'writephys 8 ')
lldb_alias('writephys16', 'writephys 16 ')
lldb_alias('writephys32', 'writephys 32 ')
lldb_alias('writephys64', 'writephys 64 ')
def _PT_Step(paddr, index, verbose_level = vSCRIPT):
"""
Step to lower-level page table and print attributes
paddr: current page table entry physical address
index: current page table entry index (0..511)
verbose_level: vHUMAN: print nothing
vSCRIPT: print basic information
vDETAIL: print basic information and hex table dump
returns: (pt_paddr, pt_valid, pt_large)
pt_paddr: next level page table entry physical address
or null if invalid
pt_valid: 1 if $kgm_pt_paddr is valid, 0 if the walk
should be aborted
pt_large: 1 if kgm_pt_paddr is a page frame address
of a large page and not another page table entry
"""
entry_addr = paddr + (8 * index)
entry = ReadPhysInt(entry_addr, 64, xnudefines.lcpu_self )
out_string = ''
if verbose_level >= vDETAIL:
for pte_loop in range(0, 512):
paddr_tmp = paddr + (8 * pte_loop)
out_string += "{0: <#020x}:\t {1: <#020x}\n".format(paddr_tmp, ReadPhysInt(paddr_tmp, 64, xnudefines.lcpu_self))
paddr_mask = ~((0xfff<<52) | 0xfff)
paddr_large_mask = ~((0xfff<<52) | 0x1fffff)
pt_valid = False
pt_large = False
pt_paddr = 0
if verbose_level < vSCRIPT:
if entry & 0x1 :
pt_valid = True
pt_large = False
pt_paddr = entry & paddr_mask
if entry & (0x1 <<7):
pt_large = True
pt_paddr = entry & paddr_large_mask
else:
out_string+= "{0: <#020x}:\n\t{1:#020x}\n\t".format(entry_addr, entry)
if entry & 0x1:
out_string += " valid"
pt_paddr = entry & paddr_mask
pt_valid = True
else:
out_string += " invalid"
pt_paddr = 0
pt_valid = False
entry = 0
if entry & (0x1 << 1):
out_string += " writable"
else:
out_string += " read-only"
if entry & (0x1 << 2):
out_string += " user"
else:
out_string += " supervisor"
if entry & (0x1 << 3):
out_string += " PWT"
if entry & (0x1 << 4):
out_string += " PCD"
if entry & (0x1 << 5):
out_string += " accessed"
if entry & (0x1 << 6):
out_string += " dirty"
if entry & (0x1 << 7):
out_string += " large"
pt_large = True
else:
pt_large = False
if entry & (0x1 << 8):
out_string += " global"
if entry & (0x3 << 9):
out_string += " avail:{0:x}".format((entry >> 9) & 0x3)
if entry & (0x1 << 63):
out_string += " noexec"
print out_string
return (pt_paddr, pt_valid, pt_large)
def _PmapL4Walk(pmap_addr_val,vaddr, verbose_level = vSCRIPT):
""" Walk the l4 pmap entry.
params: pmap_addr_val - core.value representing kernel data of type pmap_addr_t
vaddr : int - virtual address to walk
"""
is_cpu64_bit = int(kern.globals.cpu_64bit)
pt_paddr = unsigned(pmap_addr_val)
pt_valid = (unsigned(pmap_addr_val) != 0)
pt_large = 0
pframe_offset = 0
if pt_valid and is_cpu64_bit:
pt_index = (vaddr >> 39) & 0x1ff
pframe_offset = vaddr & 0x7fffffffff
if verbose_level > vHUMAN :
print "pml4 (index {0:d}):".format(pt_index)
(pt_paddr, pt_valid, pt_large) = _PT_Step(pt_paddr, pt_index, verbose_level)
if pt_valid:
pt_index = (vaddr >> 30) & 0x1ff
pframe_offset = vaddr & 0x3fffffff
if verbose_level > vHUMAN:
print "pdpt (index {0:d}):".format(pt_index)
(pt_paddr, pt_valid, pt_large) = _PT_Step(pt_paddr, pt_index, verbose_level)
if pt_valid and not pt_large:
pt_index = (vaddr >> 21) & 0x1ff
pframe_offset = vaddr & 0x1fffff
if verbose_level > vHUMAN:
print "pdt (index {0:d}):".format(pt_index)
(pt_paddr, pt_valid, pt_large) = _PT_Step(pt_paddr, pt_index, verbose_level)
if pt_valid and not pt_large:
pt_index = (vaddr >> 12) & 0x1ff
pframe_offset = vaddr & 0xfff
if verbose_level > vHUMAN:
print "pt (index {0:d}):".format(pt_index)
(pt_paddr, pt_valid, pt_large) = _PT_Step(pt_paddr, pt_index, verbose_level)
paddr = 0
paddr_isvalid = False
if pt_valid:
paddr = pt_paddr + pframe_offset
paddr_isvalid = True
if verbose_level > vHUMAN:
if paddr_isvalid:
pvalue = ReadPhysInt(paddr, 32, xnudefines.lcpu_self)
print "phys {0: <#020x}: {1: <#020x}".format(paddr, pvalue)
else:
print "no translation"
return
def _PmapWalkARMLevel1Section(tte, vaddr, verbose_level = vSCRIPT):
paddr = 0
out_string = ""
if (tte & 0x40000) == 0x40000:
paddr = ( (tte & 0xFF000000) | (vaddr & 0x00FFFFFF) )
else:
paddr = ( (tte & 0xFFF00000) | (vaddr & 0x000FFFFF) )
if verbose_level >= vSCRIPT:
out_string += "{0: <#020x}\n\t{1: <#020x}\n\t".format(addressof(tte), tte)
b_bit = (tte & 0x4) >> 2
c_bit = (tte & 0x8) >> 3
if (tte & 0x10) :
out_string += "no-execute"
else:
out_string += "execute"
if (tte & 0x40000) == 0x0:
out_string += " domain ({:d})".format(((tte & 0x1e0) >> 5) )
out_string += " imp({:d})".format( ((tte & 0x200) >> 9) )
access = ( (tte & 0xc00) >> 10 ) | ((tte & 0x8000) >> 13)
out_string += xnudefines.arm_level2_access_strings[access]
tex_bits = ((tte & 0x7000) >> 12)
out_string += " TEX:C:B({:d}{:d}{:d}:{:d}:{:d})".format(
1 if (tex_bits & 0x4) else 0,
1 if (tex_bits & 0x2) else 0,
1 if (tex_bits & 0x1) else 0,
c_bit,
b_bit
)
if tte & 0x10000:
out_string += " shareable"
else:
out_string += " not-shareable"
if tte & 0x20000 :
out_string += " not-global"
else:
out_string += " global"
if tte & 0x40000:
out_string += " supersection"
else:
out_string += " section"
if tte & 0x80000 :
out_string += " no-secure"
else:
out_string += " secure"
print out_string
return paddr
def _PmapWalkARMLevel2(tte, vaddr, verbose_level = vSCRIPT):
""" Pmap walk the level 2 tte.
params:
tte - value object
vaddr - int
returns: str - description of the tte + additional informaiton based on verbose_level
"""
pte_base = kern.PhysToKernelVirt(tte & 0xFFFFFC00)
pte_index = (vaddr >> 12) & 0xFF
pte_base_val = kern.GetValueFromAddress(pte_base, 'pt_entry_t *')
pte = pte_base_val[pte_index]
out_string = ''
if verbose_level >= vSCRIPT:
out_string += "{0: <#020x}\n\t{1: <#020x}\n\t".format(addressof(tte), tte)
if tte & 0x8:
out_string += ' no-secure'
else:
out_string += ' secure'
out_string += " domain({:d})".format(((tte & 0x1e0) >> 5))
out_string += " imp({:d})".format( ((tte & 0x200) >> 9))
out_string += "\n"
if verbose_level >= vSCRIPT:
out_string += "second-level table (index {:d}):\n".format(pte_index)
if verbose_level >= vDETAIL:
for i in range(256):
tmp = pte_base_val[i]
out_string += "{0: <#020x}:\t{1: <#020x}\n".format(addressof(tmp), unsigned(tmp))
paddr = 0
if pte & 0x2:
paddr = (unsigned(pte) & 0xFFFFF000) | (vaddr & 0xFFF)
if verbose_level >= vSCRIPT:
out_string += " {0: <#020x}\n\t{1: <#020x}\n\t".format(addressof(pte), unsigned(pte))
if (pte & 0x3) == 0x0:
out_string += " invalid"
else:
if (pte & 0x3) == 0x1:
out_string += " large"
if pte & 0x8000 == 0x8000:
out_string+= " no-execute"
else:
out_string += " execute"
else:
out_string += " small"
if (pte & 0x1) == 0x01:
out_string += " no-execute"
else:
out_string += " execute"
b_bit = (pte & 0x4) >> 2
c_bit = (pte & 0x8) >> 3
access = (pte & 0x30) >> 4 | (pte & 0x200) >> 7
out_string += xnudefines.arm_level2_access_strings[access]
tex_bits = ((pte & 0x1c0) >> 6)
if (pte & 0x3) == 0x1:
tex_bits = ((pte & 0x7000) >> 12)
out_string += " TEX:C:B({:d}{:d}{:d}:{:d}:{:d})".format(
1 if (tex_bits & 0x4) else 0,
1 if (tex_bits & 0x2) else 0,
1 if (tex_bits & 0x1) else 0,
c_bit,
b_bit
)
if pte & 0x400 :
out_string += " shareable"
else:
out_string += " not-shareable"
if pte & 0x800:
out_string += " not-global"
else:
out_string += " global"
print out_string
return paddr
def PmapWalkARM(pmap, vaddr, verbose_level = vHUMAN):
""" Pmap walking for ARM kernel.
params:
pmapval: core.value - representing pmap_t in kernel
vaddr: int - integer representing virtual address to walk
"""
paddr = 0
tte_index = ((vaddr - unsigned(pmap.min)) >> 20 )
tte = pmap.tte[tte_index]
if verbose_level >= vSCRIPT:
print "First-level table (index {:d}):".format(tte_index)
if verbose_level >= vDETAIL:
for i in range(0, 4096):
ptr = unsigned(addressof(pmap.tte[i]))
val = unsigned(pmap.tte[i])
print "{0: <#020x}:\t {1: <#020x}".format(ptr, val)
if (tte & 0x3) == 0x1:
paddr = _PmapWalkARMLevel2(tte, vaddr, verbose_level)
elif (tte & 0x3) == 0x2 :
paddr = _PmapWalkARMLevel1Section(tte, vaddr, verbose_level)
else:
paddr = 0
if verbose_level >= vSCRIPT:
print "Invalid First-Level Translation Table Entry: {0: #020x}".format(tte)
if verbose_level >= vHUMAN:
if paddr:
print "Translation of {:#x} is {:#x}.".format(vaddr, paddr)
else:
print "(no translation)"
return paddr
def PmapWalkX86_64(pmapval, vaddr):
"""
params: pmapval - core.value representing pmap_t in kernel
vaddr: int - int representing virtual address to walk
"""
_PmapL4Walk(pmapval.pm_cr3, vaddr, config['verbosity'])
def assert_64bit(val):
assert(val < 2**64)
def PmapWalk(pmap, vaddr, verbose_level = vHUMAN):
if kern.arch == 'x86_64':
return PmapWalkX86_64(pmap, vaddr)
elif kern.arch == 'arm':
return PmapWalkARM(pmap, vaddr, verbose_level)
else:
raise NotImplementedError("PmapWalk does not support {0}".format(kern.arch))
@lldb_command('pmap_walk')
def PmapWalkHelper(cmd_args=None):
""" Perform a page-table walk in <pmap> for <virtual_address>.
Syntax: (lldb) pmap_walk <pmap> <virtual_address> [-v]
Multiple -v's can be specified for increased verbosity
"""
if cmd_args == None or len(cmd_args) < 2:
raise ArgumentError("Too few arguments to pmap_walk.")
pmap = kern.GetValueAsType(cmd_args[0], 'pmap_t')
addr = unsigned(kern.GetValueFromAddress(cmd_args[1], 'void *'))
PmapWalk(pmap, addr, config['verbosity'])
return