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libheap.py
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libheap.py
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#!/usr/bin/env python
"""
Immunity Heap API for Immunity Debugger
(c) Immunity, Inc. 2004-2006
U{Immunity Inc.<http://www.immunityinc.com>} Debugger Heap Library for python
"""
__VERSION__ = '1.3'
import immutils
import struct
import string
from UserList import UserList
HEAP_MAX_FREELIST = 0x80
DEBUG = False
class PHeap:
def __init__(self, imm, heapddr = 0, restore = False):
"""
Windows 32 Heap Class
@rtype: PHEAP object
"""
self.imm = imm
self.address = heapddr
self.chunks = []
self.restore = restore
self.Segments = []
self.HeapCache = None
self.Lookaddr = None
self.Lookaside = None
if heapddr:
self._grabHeap()
def _grabHeap(self):
try:
heaps = self.imm.readMemory( self.address, 0x588 )
except WindowsError, msg:
raise Exception, "Failed to get heap at address : 0x%08x" % heapaddr
index = 0x8
(self.Signature, self.Flags, self.ForceFlags, self.VirtualMemoryThreshold,\
self.SegmentReserve, self.SegmentCommit, self.DeCommitFreeBlockThreshold, self.DeCommitTotalBlockThreshold,\
self.TotalFreeSize, self.MaximumAllocationSize, self.ProcessHeapListIndex, self.HeaderValidateLength,\
self.HeaderValidateCopy,self.NextAvailableTagIndex, self.MaximumTagIndex, self.TagEntries, \
self.UCRSegments, self.UnusedUnCommittedRanges, self.AlignRound, self.AlignMask) =\
struct.unpack("LLLLLLLLLLHHLHHLLLLL", heaps[ index : index + (0x50-8) ])
index+= 0x50-8
self.VirtualAllocedBlock = struct.unpack("LL", heaps[ index : index + 8 ])
index+=8
self._Segments = struct.unpack("L" * 64, heaps[ index: index+ 64*4 ])
index+=64*4
self.FreeListInUseLong = struct.unpack("LLLL" , heaps[ index : index + 16 ])
index+=16
(self.FreeListInUseTerminate,self.AllocatorBackTraceIndex) = struct.unpack("HH", heaps[ index : index + 4 ])
index+=4
(self.Reserved1, self.LargeBlocksIndex)= struct.unpack("LL", heaps[ index : index + 8 ])
index+=8
if self.LargeBlocksIndex:
self.HeapCache = HeapCache( self.imm, self.LargeBlocksIndex)
self.PseudoTagEntries= struct.unpack("L", heaps[ index : index + 4])
index+=4
self.FreeList=[]
# Getting the FreeList
for a in range(0, 128):
free_entry = []
# Previous and Next Chunk of the head of the double linked list
(next, prev) = struct.unpack("LL", heaps[ index + a*8 : index + a*8 + 8 ])
free_entry.append((self.address + index+ a * 8, prev, next) )
base_entry = self.address + index + a * 8
# Loop over the Double Linked List until next == to the begging of the list.
tmp = 0
while next != base_entry:
if tmp == next:
break
tmp = next
try:
(next, prev) = struct.unpack("LL", self.imm.readMemory(next, 0x8))
except:
break
free_entry.append( (tmp, prev,next) )
self.FreeList.append(free_entry)
index+=256*4
(self.LockVariable, self.CommitRoutine, self.Lookaddr, self.LookasideLockCount)=\
struct.unpack("LLLL", heaps[index:index+16])
if self.Lookaddr:
self.Lookaside = PHeapLookaside(self.imm, self.Lookaddr)
# the first segment is the heap on the base address (the 2nd chunk)
#self.Segments.
for a in range(0, 64):
if self._Segments[a] == 0x0:
break
s = Segment( self.imm, self._Segments[a] )
self.Segments.append( s )
#imm.log("Segment[%d]: 0x%08x" % (a, self.Segments[a]))
# BaseAddress
if self.restore:
self.getRestoredChunks( s.BaseAddress )
else:
self.getChunks( s.BaseAddress )
for idx in s.Pages:
self.imm.log("> 0x%08x" % idx)
if self.restore:
self.getRestoredChunks( idx )
else:
self.getChunks( idx )
def printLookaside(self, uselog=None):
if not self.Lookaside:
return None
if not uselog:
uselog = imm.log
for ndx in range(0, len(self.Lookaside)):
entry = self.Lookaside[ndx]
if not entry.isEmpty():
uselog("(%02x) Depth: %d: MaxDepth: %d FreeMiss: %d" % (ndx, entry.Depth, entry.MaxDepth, entry.FreeMiss), address = entry.addr)
for a in entry.getList():
uselog(" > 0x%08x (0x%03x)" % (a, ndx * 8), address = a)
def decimal2binary(self, num, swap = True):
if num == 0:
return '0'*32
if num < 0 :
return ''
ret = []
# while num > 0:
for a in range(32,-1, -1):
ret.append( str(num&0x1) )
num = num >> 1
if not swap:
ret.reverse()
return "".join(ret)
def printHeapCache(self, uselog=None):
ret = []
uselog("HeapCache Bitmask:")
for a in range(0, self.HeapCache.NumBuckets/32/4):
ret.append(self.decimal2binary(self.HeapCache.Bitmask[a]))
#uselog( "%s" %
if a%2:
uselog( " %s" % str(" ".join(ret) ) )
ret = []
for a in range(0, self.HeapCache.NumBuckets):
if self.HeapCache.Buckets[a]:
uselog("HEAP_CACHE[%04x] = 0x%08x" % (a+0x80, self.HeapCache.Buckets[a]), address = self.HeapCache.Buckets[a])
def printFreeListInUse(self, uselog=None):
"""
Print the Heap's FreeListInUse bitmask
@type uselog: Log Function
@param uselog: (Optional, Def: Log Window) Log function that display the information
"""
tbl= ["FreeListInUse %s %s"% (self.decimal2binary(self.FreeListInUseLong[0]), self.decimal2binary(self.FreeListInUseLong[1])),\
" %s %s" % (self.decimal2binary(self.FreeListInUseLong[2]), self.decimal2binary(self.FreeListInUseLong[3]))]
if uselog:
for a in tbl:
uselog(a)
return tbl
def printFreeList(self, uselog = None):
"""
Print the Heap's FreeList
@type uselog: Log Function
@param uselog: (Optional, Def: Log Window) Log function that display the information
"""
log = self.imm.log
if uselog:
log = uselog
for a in range(0, 128):
entry= self.FreeList[a]
e=entry[0]
log("[%03x] 0x%08x -> [ 0x%08x | 0x%08x ] " % (a, e[0], e[1], e[2]), address = e[0])
for e in entry[1:]:
try:
sz = self.get_chunk( e[0] - 8 ).size
except:
sz = 0
log(" 0x%08x -> [ 0x%08x | 0x%08x ] (%08x)" % (e[0], e[1], e[2], sz), address= e[0])
return 0x0
# Get Chunnks restored
def getRestoredChunks(self, address):
"""
Enumerate Chunks of the current heap using a restore heap
@type address: DWORD
@param address: Address where to start getting chunks
@rtype: List of win32heapchunks
@return: Chunks
"""
imm = self.imm
oldheap = imm.getKnowledge("saved_heap_%08x" % self.address) #retriving the heap
if not oldheap:
imm.log("Coudln't use restore mode: No saved Heap")
return self.getChunks(address)
ptr = address
# null chunk
backchunk = self.get_chunk(imm, ptr, self.address)
backchunk.size = backchunk.psize
backchunk.usize = backchunk.upsize
while 1:
try:
c = self.get_chunk(imm, ptr, self.address)
except:
return self.chunks
#ptr+= c.size * 8
next = ptr + c.usize
try:
sizes = imm.readLong( next )
previous = (sizes>>16) & 0xffff
except Exception:
previous = 0 # unable to read
# When to restore?
# o Chunk size is zero
# o Chunk previous size is zero
# o When Size is different from next chunk previous size
# o Next chunk previous size is zero (means, readLong fails) and the chunk is not a top chunk
# o When the size of the backward chunk is different for the chunk Size
if (not c.size) or (c.size != previous and not c.istop()) or (not previous and not c.istop()) or (backchunk.size != c.psize) :
restoredchunk = oldheap.findChunkByAddress(ptr)
if restoredchunk:
c = restoredchunk
c.setRestored()
next = ptr + c.usize
ptr = next
self.chunks.append(c)
backchunk = c
if c.istop() or c.size == 0:
break
backchunk = c
return self.chunks
def findChunkByAddress(self, addr):
"""
Find a Chunks by its address
@type address: DWORD
@param address: Address to search for
@rtype: win32heapchunks
@return: Chunk
"""
for a in self.chunks:
if a.addr == addr:
return a
return None
def getChunks(self, address, size = 0xffffffffL):
"""
Enumerate Chunks of the current heap
@type address: DWORD
@param address: Address where to start getting chunks
@type size: DWORD
@param size: (Optional, Def: All) Amount of chunks
@rtype: List of win32heapchunks
@return: Chunks
"""
imm = self.imm
ptr = address
while size:
try:
c = self.get_chunk( ptr )
except Exception, msg:
imm.log("Failed to grab chunks> " + str(msg) )
return self.chunks
self.chunks.append(c)
#c.printchunk()
ptr+= c.usize
if c.istop() or c.size == 0:
break
size -= 1
return self.chunks
def get_chunk(self, addr):
return win32heapchunk(self.imm, addr, self)
class Segment:
def __init__(self, imm, addr):
self.address = addr
addr += 8 # AVOID THE ENTRY ITSELF
imm.log(" segment 0x%08x " % addr)
mem = imm.readMemory(addr, 0x34)
(self.Signature, self.Flags, self.Heap, self.LargestUnCommitedRange, self.BaseAddress,\
self.NumberOfPages, self.FirstEntry, self.LastValidEntry, self.NumberOfUnCommittedPages,\
self.NumberOfUnCommittedRanges, self.UnCommittedRanges, self.AllocatorBackTraceIndex,\
self.Reserved, self.LastEntryInSegment) = struct.unpack("LLLLLLLLLLLHHL", mem)
if DEBUG:
imm.log("SEGMENT: 0x%08x Sig: %x" % (self.address, self.Signature), address = self.address )
imm.log("Heap: %08x LargetUncommit %08x Base: %08x" % (self.Heap, self.LargestUnCommitedRange, self.BaseAddress))
imm.log("NumberOfPages %08x FirstEntry: %08x LastValid: %08x" % (self.NumberOfPages, self.FirstEntry, self.LastValidEntry))
imm.log("Uncommited: %08x" % self.UnCommittedRanges)
self.Pages = []
if self.UnCommittedRanges:
i = 0
addr = self.UnCommittedRanges
while addr != 0:
mem = imm.readMemory( addr, 0x10 )
( C_Next, C_Addr, C_Size, C_Filler) = struct.unpack( "LLLL", mem )
if DEBUG:
imm.log( ">> Memory: 0x%08x Address: 0x%08x (a: %08x) Size: %x" % ( addr, C_Next, C_Addr,C_Size) )
self.Pages.append( C_Addr + C_Size )
addr = C_Next
class VistaPHeap(PHeap):
LFH = None
def __init__(self, imm, heapddr = 0, restore = False):
PHeap.__init__(self, imm, heapddr, restore)
def _grabHeap(self):
try:
heapmem = self.imm.readMemory( self.address + 8 , 0x120 )
except WindowsError, msg:
raise Exception, "Failed to get heap at address : 0x%08x" % heapaddr
index = 8
(self.SegmentSignature, self.SegmentFlags, self.SegmentListEntry_Flink, self.SegmentListEntry_Blink, self.Heap, self.BaseAddress, self.NumberOfPages, self.FirstEntry, self.LastValidEntry, self.NumberofUncommitedPages, self.NumberofUncommitedRanges, self.SegmentAllocatorBackTraceIndex, self.Reserved, self.UCRSegmentList_Flink, self.UCRSegmentList_Blink, self.Flags, self.ForceFlags, self.CompatibilityFlags, self.EncodeFlagMask, self.EncodingKey, self.EncodingKey2, self.PointerKey, self.Interceptor_debug, self.VirtualMemoryThreshold, self.Signature, self.SegmentReserve, self.SegmentCommit, self.DeCommitThresholdBlock, self.DeCommitThresholdTotal, self.TotalFreeSize, self.MaxAllocationSize, self.ProcessHeapsListIndex, self.HeaderValidateLength, self.HeaderValidateCopy, self.NextAvailableTagIndex, self.MaximumTagIndex, self.TagEntries, self.UCRList_Flink, self.UCRList_Blink, self.AlignRound, self.AlignMask, self.VirtualAlloc_Flink, self.VirtualAlloc_Blink, self.SegmentList_Flink, self.SegmentList_Blink, self.AllocatorBackTraceIndex, self.NonDedicatedListLenght, self.BlocksIndex, self.UCRIndex, self.PseudoTagEntries, self.FreeList_Flink, self.FreeList_Blink, self.LockVariable, self.CommitRoutine, self.FrontEndHeap, self.FrontHeapLockCount, self.FrontEndHeapType, self.TotalMemoryReserved, self.TotalMemoryCommited, self.TotalMemoryLargeUCR, self.TotalSizeInVirtualBlocks, self.TotalSegments, self.TotalUCRs, self.CommitOps, self.DecommitOps, self.LockAcquires, self.LockCollisions, self.CommitRate, self.DeCommitRate, self.CommitFailures, self.InBlockCommitFailures, self.CompactHeapCalls, self.CompactedUCRs, self.InBlockDecommits, self.InBlockDecommitSize, self.TunningParameters) = struct.unpack("L" * 11 + "HH" + "L" *18 + "HHLHH" + "L" * 19 + "HH" + "L" * 19, heapmem)
head = self.address #+0x10
addr = self.SegmentListEntry_Flink
self.Segments.append( VistaSegment( self.imm, self.address) )
self.getChunks( self.address )
if addr !=0 :
while head != (addr& ~0xff):
self.Segments.append( VistaSegment(self.imm, addr - 0x10 ) )
self.getChunks( addr & ~0xff )
addr = self.imm.readLong( addr )
else:
self.imm.log("Error: HEAP_SEGMENT address is 0x00000000")
self.getBlocks( self.BlocksIndex )
if self.FrontEndHeap:
if self.imm.isWin7:
self.LFH = Win7LFHeap(self.imm, self.FrontEndHeap)
else:
self.LFH = LFHeap( self.imm, self.FrontEndHeap )
def getBlocks(self, startaddr):
self.blocks = []
addr = startaddr
while addr:
block = Blocks( self.imm, addr )
self.blocks.append( block )
block.FreeList=[]
#calculate the number of freelists
num_of_freelists = block.ArraySize - block.BaseIndex
memory = self.imm.readMemory( block.ListHints, num_of_freelists * 8 )
#memory = self.imm.readMemory( block.Buckets, 0x80*8 )
if block.ListsInUseUlong:
block.setFreeListInUse( struct.unpack("LLLL", self.imm.readMemory( block.ListsInUseUlong, 4*4 )) )
# Getting the FreeList
for a in range(0, num_of_freelists):
free_entry = []
# Previous and Next Chunk of the head of the double linked list
(fwlink, heap_bucket) = struct.unpack("LL", memory[a *8 : a *8 + 8] )
if fwlink:
try:
(next, prev) = struct.unpack("LL", self.imm.readMemory( fwlink, 8) )
except:
next, prev = (0,0)
self.imm.log("Error with 0x%x" % fwlink)
free_entry.append( (fwlink, next, prev) )
base_entry = fwlink
while next and next != base_entry:
tmp = next
try:
chunk = win32vistaheapchunk( self.imm, next - 8, self )
except Exception:
break
self.imm.log("size: %d addr: 0x%08x 0x%08x 0x%08x" % (chunk.size, next-8, chunk.nextchunk, chunk.prevchunk))
if a == 127:
if chunk.size <= a:
break
else:
if chunk.size != a:
break
next = chunk.nextchunk
free_entry.append( (tmp, chunk.nextchunk, chunk.prevchunk) )
else:
free_entry = [ (fwlink, 0x0, 0x0) ]
#if heap_bucket & 1:
# bucket = self.getBucket( heap_bucket - 1 )
block.FreeList.append(free_entry)
addr = block.ExtendedLookup
def get_chunk(self, addr):
return win32vistaheapchunk(self.imm, addr, self)
def printFreeList(self, uselog = None):
"""
Print the Heap's FreeList
@type uselog: Log Function
@param uselog: (Optional, Def: Log Window) Log function that display the information
"""
log = self.imm.log
if uselog:
log = uselog
for block in self.blocks:
f = block.FreeListInUse
log("** Block 0x%08x BaseIndex: %d ArraySize: %d ExtraItem: %d **" % ( block.address, block.BaseIndex, block.ArraySize, block.ExtraItem ) )
if DEBUG:
log("** ListInUse: 0x%08x" % block.ListsInUseUlong)
if f:
log("FreeListInUse: %s %s" % (immutils.decimal2binary(f[0]),\
immutils.decimal2binary(f[1]) ) )
log(" %s %s" % (immutils.decimal2binary(f[2]),\
immutils.decimal2binary(f[3]) ) )
for a in range(0, 128):
entry= block.FreeList[a]
e=entry[0]
if e[0]:
log("[%03d] 0x%08x -> [ 0x%08x | 0x%08x ] " % (a, e[0], e[1], e[2]), address = e[0])
for e in entry[1:]:
log(" 0x%08x -> [ 0x%08x | 0x%08x ] " % (e[0], e[1], e[2]), address= e[0])
return 0x0
class VistaSegment:
def __init__(self, imm, addr):
self.address = addr
addr += 8 # AVOID THE ENTRY ITSELF
mem = imm.readMemory(addr+8, 0x38)
(self.SegmentSignature, self.SegmentFlags, self.SegmentListEntry_Flink, self.SegmentListEntry_Blink,\
self.Heap, self.BaseAddress, self.NumberOfPages, self.FirstEntry, self.LastValidEntry,\
self.NumberofUncommitedPages, self.NumberofUncommitedRanges, self.SegmentAllocatorBackTraceIndex,\
self.Reserved,self.UCRSegmentList_Flink,self.UCRSegmentList_Blink)=\
struct.unpack( "L" * 11 + "HH" + "L" *2, mem)
self.Entry = win32vistaheapchunk(imm, addr)
class Win7LFHeap:
def __init__(self, imm, addr):
mem = imm.readMemory( addr, 0x310 )
if not mem:
raise Exception, "Can't read Low Fragmentation Heap at 0x%08x" % addr
index = 0
self.address = addr
imm.log("Low Fragmentation Heap: 0x%08x" % addr)
(self.Lock, self.field_4, self.field_8, self.field_c,\
self.field_10, field_14, self.SubSegmentZone_Flink,
self.SubSegmentZone_Blink, self.ZoneBlockSize,\
self.Heap, self.SegmentChange, self.SegmentCreate,\
self.SegmentInsertInFree, self.SegmentDelete, self.CacheAllocs,\
self.CacheFrees, self.SizeInCache, self.Padding) = struct.unpack("L" * 0x12, mem[ index : index +0x48 ])
index += 0x48
#get the heapbucket run info
self.RunInfo = HeapBucketRunInfo(addr + index, mem[index : index + 8])
index += 0x8
self.UserBlockCache = []
for a in range(0,12):
umc = UserMemoryCache( addr + index, mem[ index : index + 0x10] )
index+= 0x10
self.UserBlockCache.append( umc )
self.Buckets = []
for a in range(0, 128):
entry = mem[ index : index + 4 ]
b = Bucket( addr + index, entry)
index = index + 4
self.Buckets.append( b )
self.LocalData = LocalData(imm, addr + index )
class HeapBucketRunInfo:
def __init__(self, addr, mem):
self.address = addr
(self.Bucket, self.RunLength) = struct.unpack("LL", mem[ 0 : 0x8 ])
class LFHeap:
def __init__(self, imm, addr):
mem = imm.readMemory( addr, 0x300 )
if not mem:
raise Exception, "Can't read Low Fragmentation Heap at 0x%08x" % addr
index = 0
self.address = addr
imm.log("Low Fragmented Heap: 0x%08x" % addr)
(self.Lock, self.field_4, self.field_8, self.field_c,\
self.field_10, field_14, self.SubSegmentZone_Flink,
self.SubSegmentZone_Blink, self.ZoneBlockSize,\
self.Heap, self.SegmentChange, self.SegmentCreate,\
self.SegmentInsertInFree, self.SegmentDelete, self.CacheAllocs,\
self.CacheFrees) = struct.unpack("L" * 0x10, mem[ index : index +0x40 ])
index += 0x40
self.UserBlockCache = []
for a in range(0,12):
umc = UserMemoryCache( addr + index, mem[ index : index + 0x10] )
index+= 0x10
self.UserBlockCache.append( umc )
self.Buckets = []
for a in range(0, 128):
entry = mem[ index : index + 4 ]
b = Bucket( addr + index, entry)
index = index + 4
self.Buckets.append( b )
self.LocalData = LocalData(imm, addr + index )
class LocalData:
def __init__(self, imm, addr):
self.address = addr
mem = imm.readMemory( addr, 0x18 + 0x68*128 )
(self.Next, self.Depth, self.Seq, self.CtrZone, self.LowFragHeap,\
self.Sequence1, self.Sequence2) = struct.unpack("LHHLLLL", mem[:0x18])
index = 0x18
self.SegmentInfo = []
for a in range(0, 128):
l = LocalSegmentInfo( imm, self.address + index,\
mem[ index : index + 0x68] )
index+= 0x68
self.SegmentInfo.append( l )
# What the real size of this, it is 0x64 or 0x68?
class LocalSegmentInfo:
def __init__(self, imm, addr, mem = ""):
self.address = addr
self.SubSegment = []
self.imm = imm
if not mem:
mem = imm.readMemory( self.address, 0x68 )
(self.Hint, self.ActiveSubsegment) = struct.unpack("LL", mem[0:8] )
index = 8
self.CachedItems = struct.unpack("L" * 0x10, mem[ index : index + 0x10*4])
index += 0x10*4
(self.Next, self.Depth, self.Seq, self.TotalBlocks,\
self.SubSegmentCounts, self.LocalData, self.LastOpSequence,\
self.BucketIndex, self.LastUsed, self.Reserved) = struct.unpack("LHHLLLLHHL", mem[index: index + 0x20])
if self.Hint:
self.SubSegment.append( self.getSubSegment( self.Hint, "Hint" ) )
if self.ActiveSubsegment and self.ActiveSubsegment != self.Hint:
self.SubSegment.append( self.getSubSegment( self.ActiveSubsegment, "ActiveSS") )
for a in range( 0, len(self.CachedItems) ):
item = self.CachedItems[a]
if item and item not in (self.Hint, self.ActiveSubsegment):
self.SubSegment.append( self.getSubSegment( item, "Cache_%02x" % a) )
def getSubSegment(self, address, type = ""):
return SubSegment(self.imm, address, type)
class SubSegment:
def __init__(self, imm, address, type=""):
self.address = address
self.type = type
self.chunks = []
mem = imm.readMemory( address, 0x20 )
(self.LocalInfo, self.UserBlocks, self.AggregateExchg,\
self.Aggregate_Sequence, self.BlockSize, self.Flags,\
self.BlockCount, self.SizeIndex, self.AffinityIndex,
self.Next, self.Lock) = struct.unpack("LLLLHHHBBLL", mem)
self.Offset = self.AggregateExchg >> 0xD
self.Offset = self.Offset & 0x7FFF8
self.Depth = self.AggregateExchg & 0xFFFF
#imm.log("UserBlock %s: 0x%08x size: %x offset: %x Depth: %x (0x%08x)" % ( self.type, self.UserBlocks, self.BlockSize, self.Offset, self.Depth, self.Next), address = self.UserBlocks)
if self.UserBlocks:
self.UserDataHeader = self.getUserData( imm, self.UserBlocks )
# XXX: We need to check the "Next" for more chunks
list = self.grabBusyList( imm, self.UserBlocks, self.Offset, self.Depth)
self.chunks = self.getChunks( imm, self.UserBlocks + self.UserDataHeader.getSize(), list )
def grabBusyList(self, imm, base_addr, offset, depth):
list = {}
i = 1
for a in range(0, depth):
address = base_addr + offset
try:
dword = imm.readLong( address + 8 )
except:
dword = 0
offset = dword & 0xFFFF
offset *=8
list[ address ] = a + 1
return list
def getUserData(self, imm, addr):
return UserData( imm, addr )
def getChunks(self, imm, address, list):
#mem = imm.readMemory( self.UserBlocks, self.BlockSize * self.BlockCount)
addr = address
chunks = []
for a in range(0, self.BlockCount):
c = win32vistaheapchunk(imm, addr, BlockSize = self.BlockSize)
s = "B"
if list.has_key(addr):
c.setFreeOrder( list[addr] )
s = "F(%02d)" % list[addr]
if DEBUG:
imm.log("Chunk size: 0x%x lfhflag: 0x%x %s" % ( self.BlockSize, c.lfhflags, s ), address = addr)
addr += self.BlockSize*8
chunks.append( c )
return chunks
class UserData:
def __init__(self, imm, addr):
self.address = addr
mem = imm.readMemory(addr, 0x10)
(self.SubSegment, self.Reserved, self.SizeIndex, self.Signature) =\
struct.unpack("LLLL", mem)
def getSize(self):
return 0x10
class Bucket:
def __init__(self, addr, mem):
self.address = addr
(self.BlockUnits, self.SizeIndex, Flag) =\
struct.unpack("HBB", mem[:4])
# Theoretically, this is how the Flag are separated:
self.UseAffinity = Flag & 0x1
self.DebugFlags = (Flag >1) & 0x3
class HeapCache:
def __init__(self, imm, addr):
self.addr = addr
self.fmt = "LLQQQLLQQLLLLLLLLLLQ"
size = struct.calcsize(self.fmt)
mem = imm.readMemory(addr, size)
imm.log(" 0x%08x - %d - %d" % (addr, size, len(mem)) )
(self.NumBuckets, self.CommittedSize, self.CounterFrequency, self.AverageAllocTime, self.AverageFreeTime,
self.SampleCounter, self.field_24, self.AllocTimeRunningTotal, self.FreeTimeRunningTotal, self.AllocTimeCount, self.FreeTimeCount,
self.Depth, self.HighDepth, self.LowDepth, self.Sequence, self.ExtendCount, self.CreateUCRCount, self.LargestHighDepth, self.HighLowDifference,
self.pBitmap) = struct.unpack(self.fmt, mem)
addr += size
self.Buckets = struct.unpack("L"* self.NumBuckets, imm.readMemory(addr, self.NumBuckets*4))
addr += self.NumBuckets*4
self.Bitmask = struct.unpack("L"* (self.NumBuckets/32/4), imm.readMemory(addr, self.NumBuckets/32))
for a in range(0, len(self.Buckets)):
if self.Buckets[a]:
imm.log("HEAP_CACHE[%04x] = 0x%08x" % (a+0x80, self.Buckets[a]) )
#HEAP_FREE_ENTRY *Buckets[NumBuckets];
#unsigned int Bitmap[NumBuckets/32];
class UserMemoryCache:
def __init__(self, addr, mem):
self.address = addr
(self.Next, self.Depth, self.Sequence, self.AvailableBlocks,\
self.Reserved) = struct.unpack("LHHLL", mem[ 0 : 16 ])
class Blocks:
def __init__(self, imm, addr):
mem = imm.readMemory( addr, 0x24 )
if not mem:
raise Exception, "Can't read Block at 0x%08x" % addr
self.address = addr
self.FreeListInUse = None
self.FreeList = []
(self.ExtendedLookup, self.ArraySize, self.ExtraItem, self.ItemCount,
self.OutOfRangeItems, self.BaseIndex, self.ListHead,\
self.ListsInUseUlong, self.ListHints) =\
struct.unpack( "L" * 9, mem )
def setFreeListInUse(self, inuse):
self.FreeListInUse = inuse
def setFreeList(self, flist):
self.FreeList = flist
SHOWCHUNK_FULL = 0x1
CHUNK_ANALIZE = 0x2
class win32heapchunk:
FLAGS = { 'EXTRA PRESENT':('E', 0x2), 'FILL PATTERN':('FP', 0x4),\
'VIRTUAL ALLOC': ('V', 0x8), 'TOP': ('T', 0x10),
'FFU1':('FFU1',0x20), 'FFU2': ('FFU2', 0x40),\
'NO COALESCE':('NC', 0x80) }
BUSY = ('BUSY', ('B', 0x1))
def __init__(self, imm, addr, heap = None):
""" Win32 Chunk """
self.imm = imm # later replace it with heap.imm
self.restored = False
self.Lookaside = False
if heap:
self.heap_addr = heap.address
else:
self.heap_addr = 0
self.nextchunk=0
self.prevchunk=0
self.addr = addr
try:
dword1 = self.imm.readLong(addr)
dword2 = self.imm.readLong(addr+4)
except Exception:
raise Exception, "Failed to read chunk at address: 0x%08x" % addr
self._get( dword1, dword2, addr, heap)
def _get(self, size, flags, addr, heap):
self.size = size & 0xffff
self.usize = self.size * 8 # unpacked
self.psize = ( size >> 16 ) & 0xffff
self.upsize = self.psize * 8
self.field4 = flags & 0xff
self.flags = (flags >> 8) & 0xff
self.other = (flags >> 16) & 0xffff
mem_addr = addr + 8
if not (self.flags & self.BUSY[1][1] ):
if self.flags & self.FLAGS['VIRTUAL ALLOC'][1]:
pass
else:
try:
self.nextchunk= self.imm.readLong(addr+8)
self.prevchunk= self.imm.readLong(addr+12)
except WindowsError:
raise Exception, "Failed to read chunk at address: 0x%08x" % addr
mem_addr +=8
else:
if self.size < 0x80:
if heap:
if heap.Lookaside:
if addr in heap.Lookaside[self.size].getList():
self.Lookaside = True
self.data_addr = mem_addr
self.data_size = self.upsize - (addr - mem_addr)
try:
self.sample = self.imm.readMemory(self.data_addr, 0x10)
except WindowsError:
raise Exception, "Failed to read chunk at address: 0x%08x" % addr
self.properties= {'size': self.usize, 'prevsize': self.upsize, 'field4': self.field4,\
'flags':self.flags, 'other':self.other, 'address':self.addr,\
'next': self.nextchunk, 'prev': self.prevchunk}
def setRestored(self):
self.restored = True
def isRestore(self):
return self.restored
def get(self, what):
try:
return self.properties[string.lower(what)]
except KeyError:
return None
def printchunk(self, uselog= None, option=0, dt= None):
ret = []
if self.isRestore():
restore = "<R>"
else:
restore = ""
ret.append((self.addr, "0x%08x> " % self.addr + "size: 0x%08x (%04x) prevsize: 0x%08x (%04x) %s" % (self.usize, self.size, \
self.upsize, self.psize, restore) ))
ret.append((self.addr, " heap: *0x%08x* flags: 0x%08x (%s)" % (self.heap_addr, self.flags,\
self.getflags(self.flags))))
#print "unused: 0x%08x flags: 0x%08x (%s)" % (self.field4, self.flags,\
# self.getflags(self.flags))
if not (self.flags & self.BUSY[1][1]):
ret.append((self.addr, " next: 0x%08x prev: 0x%08x" % (self.nextchunk, self.prevchunk)))
if option & SHOWCHUNK_FULL:
dump = immutils.hexdump(self.sample)
for a in range(0, len(dump)):
if not a:
ret.append((self.addr, " (%s %s)" % (dump[a][0], dump[a][1])))
if dt:
result = dt.Discover(self.imm.readMemory(self.data_addr, self.data_size), self.data_addr)
#self.imm.log( str(ret ))
for obj in result:
msg = obj.Print()
ret.append((obj.address, " > %s: %s " % (obj.name, msg) ))
#imm.log( "obj: %s: %s %d" % (obj.name, msg, obj.getSize() ), address = obj.address)
if uselog:
for adr, msg in ret:
uselog(msg, address = adr)
return ret
def getflags(self, flag):
f=""
if self.flags & self.BUSY[1][1]:
f+=self.BUSY[1][0]
else:
f+="F"
for a in self.FLAGS.keys():
if self.FLAGS[a][1] & self.flags:
f+="|" + self.FLAGS[a][0]
if self.Lookaside:
f += "$"
return f
def istop(self):
if self.flags & self.FLAGS['TOP'][1]:
return 1
return 0
def isfirst(self):
if self.psize == 0:
return 1
return 0
class win32vistaheapchunk(win32heapchunk):
FLAGS = { 'FILL PATTERN':('FP', 0x4), 'DEBUG': ('D', 0x8),\
'TOP': ('T', 0x10), 'FFU1':('FFU1',0x20),\
'FFU2': ('FFU2', 0x40), 'NO COALESCE':('NC', 0x80) }
LFHMASK = 0x3F
LFHFLAGS = { 'TOP': ('T', 0x3), 'BUSY': ('B', 0x18) }
def __init__(self, imm, addr, heap = None, BlockSize = 0):
self.heap = heap
self.freeorder = -1
self.isLFH = False
if BlockSize:
self.isLFH = True
self.size = BlockSize
win32heapchunk.__init__(self, imm, addr, heap)
def setFreeOrder(self, freeorder):
self.freeorder = freeorder
def _get(self, dword1, dword2, addr, heap):
heap = self.heap
self.nextchunk= 0
self.prevchunk= 0
if heap and heap.EncodeFlagMask:
dword1 ^= heap.EncodingKey
dword2 = dword2 ^ heap.EncodingKey2
self.subsegmentcode = self.SubSegmentCode = dword1
if self.isLFH:
self.upsize = self.usize = self.size << 3
self.psize = self.size
else:
self.size = dword1 & 0xffff
self.usize = self.size << 3
self.psize = dword2 & 0xffff
self.upsize = self.psize << 3
self.flags = (dword1 >> 16 & 0xff)
self.smalltagindex = (dword1 >> 24 & 0xff)
self.segmentoffset = (dword2 >> 16 & 0xff)
self.unused = (dword2 >> 24 & 0xff)
self.flags2 = self.unused # LOW FRAGMENTATION HEAP FLAGS
self.lfhflags = self.flags2
if not (self.flags & 0x1):
try:
(self.nextchunk, self.prevchunk) = struct.unpack("LL", self.imm.readMemory( addr+8, 8) )
except:
pass
self.data_addr = addr + 8
self.properties= {'size': self.usize, 'prevsize': self.upsize, 'smalltagindex': self.smalltagindex,\
'flags':self.flags, 'subsegmentcode':self.subsegmentcode, 'address':self.addr,\
'next': self.nextchunk, 'prev': self.prevchunk, 'lfhflags': self.flags2,\
'segmentoffset': self.segmentoffset }
self.data_size = self.usize - (self.addr - self.data_addr)
if DEBUG:
self.imm.log("Datasize: 0x%08x 0x%d" % (self.data_addr, self.data_size), address = self.addr)
try:
self.sample = self.imm.readMemory(self.data_addr, 0x10)
except WindowsError:
raise Exception, "Failed to read chunk at address: 0x%08x" % addr
def getflags(self, flag):
f=""
if not self.isLFH:
if self.flags & self.BUSY[1][1]:
f+=self.BUSY[1][0]
else:
f+="F"
for a in self.FLAGS.keys():
if self.FLAGS[a][1] & self.flags:
f+="|" + self.FLAGS[a][0]
else:
for k in self.LFHFLAGS.keys():
if self.flags2 == self.LFHFLAGS[k][1]:
return self.LFHFLAGS[k][0]
return f
def istop(self):
if self.flags2 == self.LFHFLAGS['TOP'][1] :
return 1
else:
return 0
def printchunk(self, uselog= None, option=0, dt= None):
ret = []
if self.isRestore():
restore = "<R>"
else:
restore = ""
if self.isLFH:
s = "B"
if self.freeorder != -1:
s="F(%02x)" % self.freeorder
ret.append( (self.addr, "Chunk size: 0x%x lfhflag: 0x%x %s" % ( self.psize, self.lfhflags, s )) )
else:
ret.append((self.addr, "0x%08x> " % self.addr + "size: 0x%08x (%04x) prevsize: 0x%08x (%04x) %s" % (self.usize, self.size, \
self.upsize, self.psize, restore) ))
ret.append((self.addr, " heap: *0x%08x* flags: 0x%02x 0x%02x (%s)" % (self.heap_addr, self.flags, self.flags2,\
self.getflags(self.flags))))
if not self.isLFH and not (self.flags2 & self.BUSY[1][1]):
ret.append((self.addr, " next: 0x%08x prev: 0x%08x" % (self.nextchunk, self.prevchunk)))
if option & SHOWCHUNK_FULL:
dump = immutils.hexdump(self.sample)
for a in range(0, len(dump)):
if not a:
ret.append((self.addr, " (%s %s)" % (dump[a][0], dump[a][1])))
if dt:
if not self.isLFH or (self.isLFH and self.freeorder == -1) :
result = dt.Discover(self.imm.readMemory(self.data_addr, self.data_size), self.data_addr)
for obj in result:
msg = obj.Print()
ret.append((obj.address, " > %s: %s " % (obj.name, msg) ))
if uselog:
for adr, msg in ret:
uselog(msg, address = adr)