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shadow.py
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# shadow - De Mysteriis Dom jemalloc
import os
import sys
import shutil
import time
import datetime
import copy
import tempfile
try:
import ConfigParser
except:
import configparser as ConfigParser
sys.path.append('.')
import jemalloc
import nursery
import symbol
VERSION = 'v2.0'
# globals
jeheap = None
arenas_addr = []
dbg_engine = None
# firefox globals
xul_version = ''
xul_symbols_pickle = ''
nursery_heap = nursery.nursery()
# android globals
android_version = ''
# detect debugger engine
try:
import gdb
import gdb_engine as dbg
dbg_engine = 'gdb'
storage_path = '/tmp/shadow'
android_version = '8'
except ImportError:
try:
import pykd
import pykd_engine as dbg
if pykd.isWindbgExt():
dbg_engine = 'pykd'
storage_path = '%s\\shadow' % tempfile.gettempdir()
xul_version = dbg.get_xul_version()
if dbg.get_arch() == 'x86':
xul_symbols_pickle = '%s\\pdb\\xul-%s.pdb.pkl' \
% (os.path.dirname(os.path.abspath(__file__)), xul_version)
else:
xul_symbols_pickle = '%s\\pdb\\xul-%s-x64.pdb.pkl' \
% (os.path.dirname(os.path.abspath(__file__)), xul_version)
except ImportError:
try:
import lldb
import lldb_engine as dbg
dbg_engine = 'lldb'
storage_path = '/tmp/shadow'
android_version = '8'
except ImportError:
pass
def store_jeheap(path):
try:
import pyrsistence
except ImportError:
raise Exception("pyrsistence is needed for heap snapshots")
global jeheap
if not os.path.isdir(path):
os.makedirs(path)
chunks_p = "%s/chunks" % path
runs_p = "%s/runs" % path
arenas_p = "%s/arenas" % path
tcaches_p = "%s/tcaches" % path
bin_info_p = "%s/bin_info" % path
modules_dict_p = "%s/modules_dict" % path
jeheap_txt_p = "%s/jeheap.txt" % path
# delete previous files
if os.path.isfile(chunks_p):
os.remove(chunks_p)
if os.path.isfile(runs_p):
os.remove(runs_p)
if os.path.isfile(arenas_p):
os.remove(arenas_p)
if os.path.isfile(tcaches_p):
os.remove(tcaches_p)
if os.path.isfile(bin_info_p):
os.remove(bin_info_p)
if os.path.isfile(modules_dict_p):
os.remove(modules_dict_p)
if os.path.isfile(jeheap_txt_p):
os.remove(jeheap_txt_p)
# store
chunks = pyrsistence.EMList(chunks_p)
for chunk in jeheap.chunks:
chunks.append(chunk)
chunks.close()
runs = pyrsistence.EMDict(runs_p)
for k,v in jeheap.runs.items():
runs[k] = v
runs.close()
arenas = pyrsistence.EMList(arenas_p)
for arena in jeheap.arenas:
arenas.append(arena)
arenas.close()
tcaches = pyrsistence.EMList(tcaches_p)
for tcache in jeheap.tcaches:
tcaches.append(tcache)
tcaches.close()
bin_info = pyrsistence.EMList(bin_info_p)
for info in jeheap.bin_info:
bin_info.append(info)
bin_info.close()
modules_dict = pyrsistence.EMDict(modules_dict_p)
for k,v in jeheap.modules_dict.items():
modules_dict[k] = v
modules_dict.close()
config = ConfigParser.RawConfigParser()
config.add_section("jeheap")
config.set("jeheap", "standalone", str(jeheap.standalone))
config.set("jeheap", "dword_size", hex(jeheap.dword_size))
config.set("jeheap", "narenas", hex(jeheap.narenas))
config.set("jeheap", "nbins", hex(jeheap.nbins))
config.set("jeheap", "chunk_size", hex(jeheap.chunk_size))
with open(jeheap_txt_p, "w") as f:
config.write(f)
def load_jeheap(path):
return jemalloc.jemalloc(path=path)
def int_from_sym(symbols_list):
for symbol in symbols_list:
try:
return dbg.to_int(dbg.get_value(symbol))
except:
continue
return None
def is_standalone_variant():
try:
_ = dbg.addressof('je_arena_bin_info')
return True
except:
return False
def has_symbols():
try:
_ = dbg.sizeof('arena_bin_info_t')
return True
except:
return False
debug_log_f = None
debug_log = lambda x: None
def _debug_log(s):
debug_log_f.write(s + "\n")
# parse functions
def parse(read_content_preview, config_path, do_debug_log=False):
global jeheap
global debug_log
global debug_log_f
global storage_path
global android_version
if do_debug_log:
debug_log_p = os.path.join(os.path.dirname(os.path.realpath(__file__)),
"debug.log")
debug_log_f = open(debug_log_p, "w")
debug_log = _debug_log
else:
debug_log = lambda x: None
if config_path:
print('[shadow] parsing configuration...')
if 'android8' in config_path:
android_version = '8'
elif 'android7' in config_path:
android_version = '7'
elif 'android6' in config_path:
android_version = '6'
update_dbg_cache_from_config(config_path)
else:
if is_standalone_variant() and not has_symbols():
print("[shadow] Detecting Android version...")
chunksize = int_from_sym(["je_chunksize", "chunksize"])
map_misc_offset = int_from_sym(["je_map_misc_offset"])
shadow_path = os.path.dirname(os.path.realpath(__file__))
cfg_path = os.path.join(shadow_path, "cfg")
# android 7/8 32bit
if chunksize == 0x80000:
# android 8 32 bit
if map_misc_offset == 0x230:
android_version = '8'
cfg_path = os.path.join(cfg_path, "android8_32.cfg")
print("[shadow] Using Android 8 32 bit configuration.")
print(" (%s)" % cfg_path)
# android 8 64 bit
elif map_misc_offset == 0x228:
android_version = '7'
cfg_path = os.path.join(cfg_path, "android7_32.cfg")
print("[shadow] Using Android 7 32 bit configuration.")
print(" (%s)" % cfg_path)
# android 7/8 64bit
elif chunksize == 0x200000:
# android 8 64bit
if map_misc_offset == 0x1010:
android_version = '8'
cfg_path = os.path.join(cfg_path, "android8_64.cfg")
print("[shadow] Using Android 8 64 bit configuration.")
print(" (%s)" % cfg_path)
# android 7 64bit
elif map_misc_offset == 0x1008:
android_version = '7'
cfg_path = os.path.join(cfg_path, "android7_64.cfg")
print("[shadow] Using Android 7 64 bit configuration.")
print(" (%s)" % cfg_path)
# android 6 32bit
elif chunksize == 0x40000 and dbg.get_dword_size() == 4:
android_version = '6'
cfg_path = os.path.join(cfg_path, "android6_32.cfg")
print("[shadow] Using Android 6 32 bit configuration.")
print(" (%s)" % cfg_path)
# android 6 64bit
elif chunksize == 0x40000 and dbg.get_dword_size() == 8:
android_version = '6'
cfg_path = os.path.join(cfg_path, "android6_64.cfg")
print("[shadow] Using Android 6 64 bit configuration.")
print(" (%s)" % cfg_path)
else:
print("[shadow] Could not detect Android version, try to use"
" a configuration file.")
return
update_dbg_cache_from_config(cfg_path)
print('[shadow] parsing structures from memory...')
print_timestamp()
jeheap = jemalloc.jemalloc()
parse_general(jeheap)
parse_chunks(jeheap)
parse_all_runs(jeheap, read_content_preview)
parse_arenas(jeheap)
if jeheap.standalone:
parse_tbin_info(jeheap)
parse_tcaches(jeheap)
if dbg_engine == "pykd":
path = os.path.join(storage_path, "jeheap")
shutil.rmtree(path, ignore_errors=True)
store_jeheap(path)
# write current config
p = os.path.join(storage_path, 'shadow.cfg')
if not os.path.isdir(storage_path):
os.makedirs(storage_path)
generate_config(p)
print('[shadow] structures parsed')
print_timestamp()
if debug_log_f:
debug_log_f.close()
def parse_general(jeheap):
global arenas_addr
debug_log("parse_general()")
jeheap.standalone = is_standalone_variant()
jeheap.dword_size = dbg.get_dword_size()
arenas_arr_addr = int_from_sym(['arenas', 'je_arenas'])
jeheap.narenas = int_from_sym(['narenas', 'narenas_total',
'je_narenas_total'])
arenas_addr = dbg.read_dwords(arenas_arr_addr, jeheap.narenas)
if jeheap.standalone:
jeheap.chunk_size = int_from_sym(['chunksize', 'je_chunksize'])
# firefox
else:
jeheap.chunk_size = 1 << 20
# number of bins
# first attempt
jeheap.nbins = int_from_sym(['nbins'])
# second attempt
if not jeheap.nbins:
jeheap.ntbins = int_from_sym(['ntbins'])
jeheap.nsbins = int_from_sym(['nsbins'])
jeheap.nqbins = int_from_sym(['nqbins'])
if jeheap.ntbins and jeheap.nsbins and jeheap.nqbins:
jeheap.nbins = jeheap.ntbins + jeheap.nsbins + jeheap.nqbins
# third attempt
# if dbg_engine == 'gdb':
# try:
# jeheap.nbins = int(dbg.execute('p __mallinfo_nbins()').split()[2])
# except:
# # print("[shadow] Using hardcoded number of bins.")
# pass
# fourth attempt - hardcoded values
if not jeheap.nbins:
# android
if jeheap.standalone:
# android 64 bit
if jeheap.dword_size == 8:
jeheap.nbins = 36
# android 32 bit
elif jeheap.dword_size == 4:
jeheap.nbins = 39
# firefox
else:
# linux
if dbg_engine == 'gdb':
# 32bit
if jeheap.dword_size == 4:
jeheap.nbins = 36
# 64 bit
else:
jeheap.nbins = 35
# windows
elif dbg_engine == 'pykd':
# 32bit
if jeheap.dword_size == 4:
jeheap.nbins = 35
# 64 bit
else:
jeheap.nbins = 34
elif dbg_engine == 'lldb':
# 32bit
if jeheap.dword_size == 4:
jeheap.nbins = 36
# 64 bit
else:
jeheap.nbins = 35
# standalone: parse the global je_arena_bin_info array
if jeheap.standalone:
info_addr = int(str(dbg.addressof('je_arena_bin_info')).split()[0], 16)
info_size = dbg.sizeof('arena_bin_info_t')
info_struct = "arena_bin_info_t"
# firefox: parse the bins of arena[0]
else:
info_addr = arenas_addr[0] + dbg.offsetof('arena_t', 'bins')
info_size = dbg.sizeof('arena_bin_t')
info_struct = "arena_bin_t"
int_size = dbg.int_size()
dword_size = dbg.get_dword_size()
bin_info_mem = dbg.read_bytes(info_addr, jeheap.nbins * info_size)
# split memory into buffers of info_struct
bin_info_mem = [bin_info_mem[i:i+info_size]
for i in range(0, jeheap.nbins * info_size, info_size)]
for buf in bin_info_mem:
reg_size = dbg.read_struct_member(buf, info_struct,
"reg_size", dword_size)
run_size = dbg.read_struct_member(buf, info_struct,
"run_size", dword_size)
reg0_off = dbg.read_struct_member(buf, info_struct,
"reg0_offset", int_size)
nregs = dbg.read_struct_member(buf, info_struct,
"nregs", int_size)
jeheap.bin_info.append(jemalloc.bin_info(reg_size,
run_size,
reg0_off,
nregs))
for name, range_list in dbg.modules_dict().items():
jeheap.modules_dict[name] = range_list
def parse_arenas(jeheap):
global arenas_addr
dword_size = dbg.get_dword_size()
bin_size = dbg.sizeof('arena_bin_t')
for i in range(0, jeheap.narenas):
cur_arena_addr = arenas_addr[i]
cur_arena_bins_addr = cur_arena_addr + dbg.offsetof('arena_t', 'bins')
if cur_arena_addr == 0:
continue
bins_mem = dbg.read_bytes(cur_arena_bins_addr,
jeheap.nbins * bin_size)
bins_mem = [bins_mem[z:z+bin_size]
for z in range(0, jeheap.nbins * bin_size, bin_size)]
cur_arena = jemalloc.arena(cur_arena_addr, i, [], [], [])
for j in range(0, jeheap.nbins):
bin_addr = cur_arena_bins_addr + bin_size * j
buf = bins_mem[j]
runcur_addr = dbg.read_struct_member(buf, "arena_bin_t",
"runcur", dword_size)
# associate run address with run object
if runcur_addr == 0:
run = None
else:
run = jeheap.runs[str(runcur_addr)]
# create new bin object
cur_arena.bins.append(jemalloc.arena_bin(bin_addr, j, run))
# add arena to the list of arenas
jeheap.arenas.append(copy.deepcopy(cur_arena))
def parse_run(jeheap, hdr_addr, addr, run_hdr, run_size, binind, read_content_preview):
if hdr_addr == 0 or run_size == 0:
return None
bin_invalid = 0xff
# case1: large run
if binind == bin_invalid:
return jemalloc.run(hdr_addr, addr, run_size, binind, 0, 0, [])
# case2: small run
bin_info = jeheap.bin_info
run_size = bin_info[binind].run_size
region_size = bin_info[binind].reg_size
reg0_offset = bin_info[binind].reg0_off
total_regions = bin_info[binind].nregs
free_regions = dbg.read_struct_member(run_hdr, "arena_run_t",
"nfree", dbg.int_size())
# run bitmap parsing
regs_mask_bits = (total_regions // 8) + 1
# "regs_mask" member changed to "bitmap" in the standalone version
if jeheap.standalone:
regs_mask_offset = dbg.offsetof('arena_run_t', 'bitmap')
else:
regs_mask_offset = dbg.offsetof('arena_run_t', 'regs_mask')
regs_mask_bytearr = run_hdr[regs_mask_offset:
regs_mask_offset + regs_mask_bits]
# parse the bitmap and store the bits to regs_mask
regs_mask = []
for byte in regs_mask_bytearr:
for bit_pos in range(0, 8):
if len(regs_mask) >= total_regions:
break
if byte & (1 << bit_pos) > 0:
regs_mask.append(1)
else:
regs_mask.append(0)
# regions parsing loop
regions = []
reg0_addr = addr + reg0_offset
if read_content_preview:
n_dwords = run_size // jeheap.dword_size
run_mem = dbg.read_dwords(addr, n_dwords)
for i in range(0, total_regions):
reg_addr = reg0_addr + (i * region_size)
data = None
data_map = None
if read_content_preview:
idx = (reg_addr - addr) // jeheap.dword_size
data = run_mem[idx]
regions.append(jemalloc.region(i, reg_addr, region_size,
regs_mask[i], data, data_map))
return jemalloc.run(hdr_addr, addr, run_size, binind, free_regions,
regs_mask, regions)
# parse the metadata of all runs and their regions
def parse_all_runs(jeheap, read_content_preview):
global dbg_engine
debug_log("parse_all_runs()")
# parse the bitmap of each chunk and find all the runs
# the arena_run_t header in the standalone version is stored at a
# map_misc array inside arena_chunk_t. The offset of this member can be
# found through the je_map_misc_offset symbol
if jeheap.standalone:
bits_offset = dbg.offsetof('arena_chunk_map_bits_t', 'bits') // jeheap.dword_size
chunk_map_dwords = dbg.sizeof('arena_chunk_map_bits_t') // jeheap.dword_size
bitmap_off = dbg.offsetof('arena_chunk_t', 'map_bits')
chunk_arena_off = dbg.offsetof('arena_chunk_t', 'node') \
+ dbg.offsetof('extent_node_t', 'en_arena')
map_misc_offset = dbg.to_int(dbg.get_value('je_map_misc_offset'))
arena_run_bin_off = None
# the arena_run_t header is stored at the hdr_addr of each run in
# the firefox version
else:
bits_offset = dbg.offsetof('arena_chunk_map_t', 'bits') // jeheap.dword_size
chunk_map_dwords = dbg.sizeof('arena_chunk_map_t') // jeheap.dword_size
bitmap_off = dbg.offsetof('arena_chunk_t', 'map')
chunk_arena_off = dbg.offsetof('arena_chunk_t', 'arena')
map_misc_offset = None
arena_run_bin_off = dbg.offsetof('arena_run_t', 'bin')
arena_bin_size = dbg.sizeof('arena_bin_t')
bins_offset = dbg.offsetof('arena_t', 'bins')
if jeheap.standalone:
map_bias = int_from_sym(['je_map_bias'])
else:
map_bias = 0
chunk_npages = jeheap.chunk_size >> 12
bitmap_len = (chunk_npages - map_bias) * chunk_map_dwords
# the 12 least significant bits of each bitmap entry hold
# various flags for the corresponding run
flags_mask = (1 << 12) - 1
dword_size = dbg.get_dword_size()
for chunk in jeheap.chunks:
debug_log(" parsing chunk @ 0x%x" % chunk.addr)
# does this skip huge regions?
if not chunk.arena_addr:
debug_log(" no arena_addr, skpping")
continue
if jeheap.standalone:
chunk_mem = dbg.read_bytes(chunk.addr, map_bias * dbg.get_page_size())
else:
chunk_mem = dbg.read_bytes(chunk.addr, jeheap.chunk_size)
if jeheap.standalone:
node_off = dbg.offsetof("arena_chunk_t", "node")
en_addr_off = dbg.offsetof("extent_node_t", "en_addr")
en_addr = dbg.dword_from_buf(chunk_mem, node_off + en_addr_off)
if en_addr != chunk.addr:
continue
# read the chunk bitmap
off = bitmap_off
bitmap_dwords = []
for i in range(bitmap_len):
bitmap_dwords.append(dbg.dword_from_buf(chunk_mem, off))
off += dword_size
bitmap = [bitmap_dwords[i] for i in range(int(bits_offset), \
int(len(bitmap_dwords)), int(bits_offset + 1))]
# parse chunk bitmap elements
i = -1
for mapelm in bitmap:
i += 1
debug_log(" [%04d] mapelm = 0x%x" % (i, mapelm))
# small run
if mapelm & 0xf == 1:
if jeheap.standalone:
debug_log(" small run")
if android_version == '6':
offset = mapelm & ~flags_mask
elif android_version == '7' or android_version == '8':
# offset = (mapelm >> 13) << 12
offset = (mapelm & ~0x1FFF) >> 1
debug_log(" offset = 0x%x" % offset)
# part of the previous run
if offset != 0:
continue
map_misc_addr = chunk.addr + map_misc_offset
cur_arena_chunk_map_misc = map_misc_addr + \
i * dbg.sizeof('arena_chunk_map_misc_t')
hdr_addr = cur_arena_chunk_map_misc + \
dbg.offsetof('arena_chunk_map_misc_t', 'run')
debug_log(" hdr_addr = 0x%x" % hdr_addr)
run_hdr_off = map_misc_offset \
+ i * dbg.sizeof('arena_chunk_map_misc_t') \
+ dbg.offsetof('arena_chunk_map_misc_t', 'run')
run_hdr = chunk_mem[run_hdr_off:
run_hdr_off + dbg.sizeof("arena_run_t")]
# decode the bin index
if android_version == '6':
binind = (mapelm & 0xFF0) >> 4
elif android_version== '7' or android_version == '8':
binind = (mapelm & 0x1FE0) >> 5
debug_log(" binind = 0x%x" % binind)
size = jeheap.bin_info[binind].run_size
debug_log(" size = 0x%x" % size)
# firefox
else:
hdr_addr = mapelm & ~flags_mask
off = hdr_addr - chunk.addr
# part of the previous run
if str(hdr_addr) in jeheap.runs:
continue
run_hdr = chunk_mem[off:off+dbg.sizeof("arena_run_t")]
bin_addr = dbg.dword_from_buf(run_hdr, arena_run_bin_off)
# firefox stores the bin addr, we can find the binind as follows:
binind = (bin_addr - (chunk.arena_addr + bins_offset)) // arena_bin_size
size = jeheap.bin_info[binind].run_size
run_hdr_sz = dbg.sizeof("arena_run_t")
run_hdr_sz += (jeheap.bin_info[binind].nregs // 8) + 1
run_hdr = chunk_mem[off:
off + run_hdr_sz]
# large run
elif mapelm & 0xf == 3:
if jeheap.standalone:
debug_log(" large run")
map_misc_addr = chunk.addr + map_misc_offset
cur_arena_chunk_map_misc = map_misc_addr + \
i * dbg.sizeof('arena_chunk_map_misc_t')
hdr_addr = cur_arena_chunk_map_misc + \
dbg.offsetof('arena_chunk_map_misc_t', 'run')
debug_log(" run_hdr = 0x%x" % hdr_addr)
run_hdr_off = map_misc_offset \
+ i * dbg.sizeof('arena_chunk_map_misc_t') \
+ dbg.offsetof('arena_chunk_map_misc_t', 'run')
run_hdr = chunk_mem[run_hdr_off:
run_hdr_off + dbg.sizeof("arena_run_t")]
if android_version == '6':
size = mapelm & ~flags_mask
elif android_version == '7' or android_version == '8':
size = (mapelm & ~0x1FFF) >> 1
debug_log(" size = 0x%x" % size)
# firefox
else:
hdr_addr = chunk.addr + i * dbg.get_page_size()
off = hdr_addr - chunk.addr
run_hdr = chunk_mem[off:
off + dbg.sizeof("arena_run_t")]
size = mapelm & ~flags_mask
binind = 0xff
# unallocated run
else:
debug_log(" unallocated page")
continue
if hdr_addr == 0 or size == 0:
debug_log(" hdr_addr or size is 0, skipping")
continue
if jeheap.standalone:
addr = chunk.addr + (i + map_bias) * dbg.get_page_size()
# firefox
else:
addr = hdr_addr
debug_log(" addr = 0x%x" % addr)
jeheap.runs[str(hdr_addr)] = parse_run(jeheap, hdr_addr, addr, run_hdr,
size, binind, read_content_preview)
chunk.runs.append(hdr_addr)
# parse all jemalloc chunks
def parse_chunks(jeheap):
debug_log("parse_chunks()")
dword_size = dbg.get_dword_size()
if jeheap.standalone:
chunks_rtree_addr = int(str(dbg.addressof('je_chunks_rtree')).split()[0], 16)
rtree_mem = dbg.read_bytes(chunks_rtree_addr, dbg.sizeof("rtree_t"))
max_height = dbg.read_struct_member(rtree_mem, "rtree_t",
"height", dbg.int_size())
# levels[] is of type rtree_level_t
levels_arr_addr = chunks_rtree_addr + \
dbg.offsetof('rtree_t', 'levels')
rtree_level_size = dbg.sizeof('rtree_level_t')
rtree_levels_mem = dbg.read_bytes(levels_arr_addr,
rtree_level_size * max_height)
root = None
for height in range(0, max_height):
off = height * rtree_level_size
level_mem = rtree_levels_mem[off:off+rtree_level_size]
addr = dbg.read_struct_member(level_mem, "rtree_level_t",
"subtree", dword_size)
if addr == 0:
continue
root = (addr, height)
break
# firefox
else:
chunks_rtree_addr = int_from_sym(['chunk_rtree'])
rtree_mem = dbg.read_bytes(chunks_rtree_addr, dbg.sizeof("malloc_rtree_t"))
max_height = dbg.read_struct_member(rtree_mem, "malloc_rtree_t",
"height", dbg.int_size())
root = dbg.read_struct_member(rtree_mem, "malloc_rtree_t",
"root", dbg.get_dword_size())
root = (root, 0)
levels_arr_addr = chunks_rtree_addr + \
dbg.offsetof('malloc_rtree_t', 'level2bits')
rtree_level_size = dbg.int_size()
rtree_levels_mem = dbg.read_bytes(levels_arr_addr,
rtree_level_size * max_height)
off = 0
level2bits = []
for i in range(0, max_height):
level2bits.append(dbg.int_from_buf(rtree_levels_mem, off))
off += dbg.int_size()
if not root:
raise Exception("[shadow] Could not find the root of chunks_rtree.")
stack = []
stack.append(root)
while len(stack):
(node, height) = stack.pop()
if jeheap.standalone:
cur_level_addr = levels_arr_addr + height * rtree_level_size
bits = dbg.read_memory(cur_level_addr +
dbg.offsetof('rtree_level_t', 'bits'),
dbg.int_size())
else:
bits = level2bits[height]
max_key = 1 << bits
subtree = dbg.read_dwords(node, max_key)
for addr in subtree:
if addr == 0:
continue
if height == max_height - 1:
if jeheap.standalone:
node_addr = addr + dbg.offsetof('arena_chunk_t', 'node')
en_arena = dbg.read_dword(node_addr +
dbg.offsetof('extent_node_t', 'en_arena'))
arena_addr = en_arena
else:
try:
arena_addr = dbg.read_dword(addr +
dbg.offsetof('arena_chunk_t', 'arena'))
except:
arena_addr = 0
global arenas_addr
exists = False
if arena_addr in arenas_addr:
exists = True
# this fixes the weird case where a non page aligned
# chunk address is found, for example:
# ...
# chunk @ 0xcc4ef4c0 <-- actually belongs to chunk 0xcc480000
# chunk @ 0xcc280000 |
# chunk @ 0xcc480000 <----------------------------------|
# ...
# XXX: investigate this
if addr & 0xfff:
debug_log(" skipping non-page aligned chunk address 0x%x" % addr)
continue
if exists:
debug_log(" chunk @ 0x%x" % addr)
jeheap.chunks.append(
jemalloc.chunk(addr, arena_addr, []))
else:
debug_log(" non-arena chunk @ 0x%x" % addr)
jeheap.chunks.append(
jemalloc.chunk(addr, None, []))
else:
stack.append((addr, height + 1))
# config functions
def update_dbg_cache_from_config(config_path):
config = ConfigParser.RawConfigParser()
config.read(config_path)
if config.has_section('offsets'):
for name,value in config.items('offsets'):
dbg.cache_offsets[name] = int(value, 16)
if config.has_section('values'):
for name,value in config.items('values'):
dbg.cache_values[name] = int(value, 16)
if config.has_section('sizes'):
for name,value in config.items('sizes'):
dbg.cache_sizes[name] = int(value, 16)
def generate_config(config_path):
config = ConfigParser.RawConfigParser()
config.add_section('values')
for name,value in dbg.cache_values.items():
if str(value).startswith('0x'):
config.set('values', name, str(value))
else:
config.set('values', name, hex(int(value)))
config.add_section('offsets')
for name,value in dbg.cache_offsets.items():
config.set('offsets', name, hex(value))
config.add_section('sizes')
for name,value in dbg.cache_sizes.items():
config.set('sizes', name, hex(value))
with open(config_path, 'w') as f:
config.write(f)
def parse_tbin_info(jeheap):
nhbins = int_from_sym(['je_nhbins', 'nhbins'])
int_size = dbg.int_size()
addr = dbg.get_value('je_tcache_bin_info')
size = nhbins * int_size
mem = dbg.read_bytes(addr, size)
off = 0
while off < len(mem):
ncached_max = dbg.int_from_buf(mem, off)
off += int_size
jeheap.tbin_info.append(jemalloc.tbin_info(ncached_max))
def parse_tcaches(jeheap):
nhbins = int_from_sym(['je_nhbins', 'nhbins'])
dword_size = dbg.get_dword_size()
max_cached = 0
for tbinfo in jeheap.tbin_info:
max_cached += tbinfo.ncached_max
tcache_size = dbg.offsetof("tcache_t", "tbins") + \
(dbg.sizeof("tcache_bin_t") * nhbins) + \
(max_cached * dword_size)
tcache_size = size2bin_size(jeheap, tcache_size)
# tcache_size = 0x1C00
BIONIC_PTHREAD_KEY_COUNT = 141
arenas_addr = [arena.addr for arena in jeheap.arenas]
data_off = dbg.offsetof("pthread_key_data_t" , "data")
pthread_internal_size = dbg.sizeof("pthread_internal_t")
key_data_off = dbg.offsetof('pthread_internal_t', 'key_data')
key_data_size = dbg.sizeof('pthread_key_data_t') * BIONIC_PTHREAD_KEY_COUNT
# g_thread_list points to the first pthread_internal_t struct
elm_addr = dbg.get_value("g_thread_list", True)
while elm_addr != 0:
elm_mem = dbg.read_bytes(elm_addr, pthread_internal_size)
elm_tid = dbg.read_struct_member(elm_mem, "pthread_internal_t",
"tid", dbg.int_size())
# key_data array
key_data = elm_mem[key_data_off:key_data_off + key_data_size]
# transform to a list containing only the key_data->data
off = data_off
key_data_data = []
while off < len(key_data):
data = dbg.dword_from_buf(key_data, off)
key_data_data.append(data)
off += data_off
# search for jemalloc TSD(Thread Specific Data)
tsd_addr = 0
for data in key_data_data:
if data == 0:
continue
# check if data is a ptr
addr = data
addr_info = find_address(addr, jeheap)
# jemalloc TSD is a 0x80 region that contains pointers to the
# tcache and the arena; unsure if we can rely on their offsets
# so we parse the region's data to make sure
if addr_info.region:
region_dwords = dbg.read_dwords(addr_info.region.addr,
addr_info.region.size)
for dword in region_dwords:
if dword in arenas_addr:
tsd_addr, tsd_dwords = addr, region_dwords
break
if tsd_addr:
break
if not tsd_addr:
k = str(elm_tid)
jeheap.tcaches[k] = None
elm_addr = dbg.read_struct_member(elm_mem, "pthread_internal_t",
"next", dbg.get_dword_size())
continue
arena_addr = 0
tcache_addr = 0
for dword in tsd_dwords:
if arena_addr and tcache_addr:
break
if dword in arenas_addr:
arena_addr = dword
continue
addr_info = find_address(dword, jeheap)
if addr_info.region:
if addr_info.region.size == tcache_size:
tcache_addr = dword