--- /dev/null
+from xnu import *
+from utils import *
+from process import *
+from pmap import *
+
+def _GetIntegerDataFromTask(u_ptr, task_abi):
+ """
+ params:
+ u_ptr : int - pointer in user memory
+ task_abi : int - what kind of user program is running
+ returns:
+ int - value stored at specified u_ptr.
+ """
+ if kern.arch != "x86_64":
+ raise ValueError("This function does not work for non x86_64 arch")
+ if task_abi == 0xf :
+ return unsigned(dereference(kern.GetValueFromAddress(u_ptr, 'uint64_t *')))
+ else:
+ return unsigned(dereference(kern.GetValueFromAddress(u_ptr, 'uint32_t *')))
+
+def GetBinaryNameForPC(pc_val, user_lib_info = None):
+ """ find the binary in user_lib_info that the passed pc_val falls in range of.
+ params:
+ pc_val : int - integer form of the pc address
+ user_lib_info: [] of [] which hold start, end, binary name
+ returns:
+ str - Name of binary or "unknown" if not found.
+ """
+ retval = "unknown"
+ if not user_lib_info:
+ return retval
+ matches = []
+ for info in user_lib_info:
+ if pc_val >= info[0] and pc_val <= info[1]:
+ matches.append((pc_val - info[0], info[2]))
+ matches.sort()
+ if matches:
+ retval = matches[0][1]
+ return retval
+
+def ShowX86UserStack(thread, user_lib_info = None):
+ """ Display user space stack frame and pc addresses.
+ params:
+ thread: obj referencing thread value
+ returns:
+ Nothing
+ """
+ iss = Cast(thread.machine.iss, 'x86_saved_state_t *')
+ abi = int(iss.flavor)
+ user_ip = 0
+ user_frame = 0
+ user_abi_ret_offset = 0
+ if abi == 0xf:
+ debuglog("User process is 64 bit")
+ user_ip = iss.uss.ss_64.isf.rip
+ user_frame = iss.uss.ss_64.rbp
+ user_abi_ret_offset = 8
+ else:
+ debuglog("user process is 32 bit")
+ user_ip = iss.uss.ss_32.eip
+ user_frame = iss.uss.ss_32.ebp
+ user_abi_ret_offset = 4
+
+ if user_ip == 0:
+ print "This activation does not appear to have a valid user context."
+ return False
+
+ cur_ip = user_ip
+ cur_frame = user_frame
+ debuglog("ip= 0x%x , fr = 0x%x " % (cur_ip, cur_frame))
+ kdp_pmap_addr = unsigned(addressof(kern.globals.kdp_pmap))
+ if not WriteInt64ToMemoryAddress(unsigned(thread.task.map.pmap), kdp_pmap_addr):
+ print "Failed to write in kdp_pmap = 0x{0:0>16x} value.".format(thread.task.map.pmap)
+ return False
+ debuglog("newpmap = 0x{:x}".format(kern.globals.kdp_pmap))
+
+ frameformat = "{0:d} FP: 0x{1:x} PC: 0x{2:x}"
+ if user_lib_info is not None:
+ frameformat = "{0:d} {3: <30s} 0x{2:x}"
+ print frameformat.format(0, cur_frame, cur_ip, GetBinaryNameForPC(cur_ip, user_lib_info))
+
+ print kern.Symbolicate(cur_ip)
+ tmp_frame = unsigned(cur_frame)
+ prev_frame = _GetIntegerDataFromTask(tmp_frame, abi)
+ prev_ip = _GetIntegerDataFromTask(tmp_frame + user_abi_ret_offset, abi)
+ frameno = 1
+ while prev_frame and prev_frame != 0x0000000800000008:
+ print frameformat.format(frameno, prev_frame, prev_ip, GetBinaryNameForPC(prev_ip, user_lib_info))
+ print kern.Symbolicate(prev_ip)
+ prev_ip = _GetIntegerDataFromTask(prev_frame + user_abi_ret_offset, abi)
+ prev_frame = _GetIntegerDataFromTask(prev_frame, abi)
+ frameno +=1
+ if not WriteInt64ToMemoryAddress(0, kdp_pmap_addr):
+ print "Failed to write in kdp_pmap = 0"
+ return False
+ return
+
+def _PrintARMUserStack(task, cur_pc, cur_fp, framesize, frametype, frameformat, user_lib_info=None):
+ if cur_pc == 0:
+ "No valid user context for this activation."
+ return
+ frameno = 0
+ print frameformat.format(frameno, cur_fp, cur_pc, GetBinaryNameForPC(cur_pc, user_lib_info))
+ while True:
+ frameno = frameno + 1
+ frame = GetUserDataAsString(task, cur_fp, framesize)
+ cur_fp = _ExtractDataFromString(frame, 0, frametype)
+ cur_pc = _ExtractDataFromString(frame, (framesize / 2), frametype)
+ if not cur_fp:
+ break
+ print frameformat.format(frameno, cur_fp, cur_pc, GetBinaryNameForPC(cur_pc, user_lib_info))
+
+def ShowARMUserStack(thread, user_lib_info = None):
+ cur_pc = unsigned(thread.machine.PcbData.pc)
+ cur_fp = unsigned(thread.machine.PcbData.r[7])
+ frameformat = "{0:>2d} FP: 0x{1:x} PC: 0x{2:x}"
+ if user_lib_info is not None:
+ frameformat = "{0:>2d} {3: <30s} 0x{2:0>8x}"
+ framesize = 8
+ frametype = "uint32_t"
+ _PrintARMUserStack(thread.task, cur_pc, cur_fp, framesize, frametype, frameformat, user_lib_info=user_lib_info)
+
+
+@lldb_command('showthreaduserstack')
+def ShowThreadUserStack(cmd_args=None):
+ """ Show user stack for a given thread.
+ Syntax: (lldb) showthreaduserstack <thread_ptr>
+ """
+ if not cmd_args:
+ raise ArgumentError("Insufficient arguments")
+
+ thread = kern.GetValueFromAddress(ArgumentStringToInt(cmd_args[0]), 'thread *')
+ if kern.arch == "x86_64":
+ ShowX86UserStack(thread)
+ elif kern.arch == "arm":
+ ShowARMUserStack(thread)
+ return True
+
+@lldb_command('showtaskuserstacks')
+def ShowTaskUserStacks(cmd_args=None):
+ """ Print out the user stack for each thread in a task, followed by the user libraries.
+ Syntax: (lldb) showtaskuserstacks <task_t>
+ The format is compatible with CrashTracer. You can also use the speedtracer plugin as follows
+ (lldb) showtaskuserstacks <task_t> -p speedtracer
+
+ Note: the address ranges are approximations. Also the list may not be completely accurate. This command expects memory read failures
+ and hence will skip a library if unable to read information. Please use your good judgement and not take the output as accurate
+ """
+ if not cmd_args:
+ raise ArgumentError("Insufficient arguments")
+
+ task = kern.GetValueFromAddress(cmd_args[0], 'task *')
+ #print GetTaskSummary.header + " " + GetProcSummary.header
+ pval = Cast(task.bsd_info, 'proc *')
+ #print GetTaskSummary(task) + " " + GetProcSummary(pval) + "\n \n"
+ crash_report_format_string = """\
+Process: {pid: <10d}
+Path: {path: <50s}
+Identifier: {pname: <30s}
+Version: ??? (???)
+Code Type: {parch: <20s}
+Parent Process: {ppname: >20s}[{ppid:d}]
+
+Date/Time: {timest:s}.000 -0800
+OS Version: {osversion: <20s}
+Report Version: 8
+
+Exception Type: n/a
+Exception Codes: n/a
+Crashed Thread: 0
+
+Application Specific Information:
+Synthetic crash log generated from Kernel userstacks
+
+"""
+ user_lib_rex = re.compile("([0-9a-fx]+)\s-\s([0-9a-fx]+)\s+(.*?)\s", re.IGNORECASE|re.MULTILINE)
+ from datetime import datetime
+ ts = datetime.fromtimestamp(int(pval.p_start.tv_sec))
+ date_string = ts.strftime('%Y-%m-%d %H:%M:%S')
+ is_64 = False
+ if pval.p_flag & 0x4 :
+ is_64 = True
+
+ parch_s = ""
+ if kern.arch == "x86_64" or kern.arch == "i386":
+ osversion = "Mac OS X 10.8"
+ parch_s = "I386 (32 bit)"
+ if is_64:
+ parch_s = "X86-64 (Native)"
+ else:
+ parch_s = kern.arch
+ osversion = "iOS"
+ osversion += " ({:s})".format(kern.globals.osversion)
+ print crash_report_format_string.format(pid = pval.p_pid,
+ pname = pval.p_comm,
+ path = pval.p_comm,
+ ppid = pval.p_ppid,
+ ppname = GetProcNameForPid(pval.p_ppid),
+ timest = date_string,
+ parch = parch_s,
+ osversion = osversion
+
+ )
+ print "Binary Images:"
+ ShowTaskUserLibraries([hex(task)])
+ usertask_lib_info = [] # will host [startaddr, endaddr, lib_name] entries
+ for entry in ShowTaskUserLibraries.found_images:
+ #print "processing line %s" % line
+ arr = user_lib_rex.findall(entry[3])
+ #print "%r" % arr
+ if len(arr) == 0 :
+ continue
+ usertask_lib_info.append([int(arr[0][0],16), int(arr[0][1],16), str(arr[0][2]).strip()])
+
+ printthread_user_stack_ptr = ShowX86UserStack
+ if kern.arch == "arm":
+ printthread_user_stack_ptr = ShowARMUserStack
+
+ counter = 0
+ for thval in IterateQueue(task.threads, 'thread *', 'task_threads'):
+ print "\nThread {0:d} name:0x{1:x}\nThread {0:d}:".format(counter, thval)
+ counter += 1
+ try:
+ printthread_user_stack_ptr(thval, usertask_lib_info)
+ except Exception as exc_err:
+ print "Failed to show user stack for thread 0x{0:x}".format(thval)
+ if config['debug']:
+ raise exc_err
+ else:
+ print "Enable debugging ('(lldb) xnudebug debug') to see detailed trace."
+ return
+
+
+def GetUserDataAsString(task, addr, size):
+ """ Get data from task's address space as a string of bytes
+ params:
+ task: task object from which to extract information
+ addr: int - start address to get data from.
+ size: int - no of bytes to read.
+ returns:
+ str - a stream of bytes. Empty string if read fails.
+ """
+ err = lldb.SBError()
+ if GetConnectionProtocol() == "kdp":
+ kdp_pmap_addr = unsigned(addressof(kern.globals.kdp_pmap))
+ if not WriteInt64ToMemoryAddress(unsigned(task.map.pmap), kdp_pmap_addr):
+ debuglog("Failed to write in kdp_pmap from GetUserDataAsString.")
+ return ""
+ content = LazyTarget.GetProcess().ReadMemory(addr, size, err)
+ if not err.Success():
+ debuglog("Failed to read process memory. Error: " + err.description)
+ return ""
+ if not WriteInt64ToMemoryAddress(0, kdp_pmap_addr):
+ debuglog("Failed to reset in kdp_pmap from GetUserDataAsString.")
+ return ""
+ elif kern.arch in ['arm'] and long(size) < (2 * kern.globals.page_size):
+ # Without the benefit of a KDP stub on the target, try to
+ # find the user task's physical mapping and memcpy the data.
+ # If it straddles a page boundary, copy in two passes
+ range1_addr = long(addr)
+ range1_size = long(size)
+ if kern.StraddlesPage(range1_addr, range1_size):
+ range2_addr = long(kern.TruncPage(range1_addr + range1_size))
+ range2_size = long(range1_addr + range1_size - range2_addr)
+ range1_size = long(range2_addr - range1_addr)
+ else:
+ range2_addr = 0
+ range2_size = 0
+ range2_in_kva = 0
+
+ paddr_range1 = PmapWalk(task.map.pmap, range1_addr, vSILENT)
+ if not paddr_range1:
+ debuglog("Not mapped task 0x{:x} address 0x{:x}".format(task, addr))
+ return ""
+
+ range1_in_kva = kern.PhysToKernelVirt(paddr_range1)
+ content = LazyTarget.GetProcess().ReadMemory(range1_in_kva, range1_size, err)
+ if not err.Success():
+ raise RuntimeError("Failed to read process memory. Error: " + err.description)
+
+ if range2_addr:
+ paddr_range2 = PmapWalk(task.map.pmap, range2_addr, vSILENT)
+ if not paddr_range2:
+ debuglog("Not mapped task 0x{:x} address 0x{:x}".format(task, addr))
+ return ""
+ range2_in_kva = kern.PhysToKernelVirt(paddr_range2)
+ content += LazyTarget.GetProcess().ReadMemory(range1_in_kva, range1_size, err)
+ if not err.Success():
+ raise RuntimeError("Failed to read process memory. Error: " + err.description)
+ else:
+ raise NotImplementedError("GetUserDataAsString does not support this configuration")
+
+ return content
+
+def _ExtractDataFromString(strdata, offset, data_type, length=0):
+ """ Extract specific data from string buffer
+ params:
+ strdata: str - string data give from GetUserDataAsString
+ offset: int - 0 based offset into the data.
+ data_type: str - defines what type to be read as. Supported values are:
+ 'uint64_t', 'uint32_t', 'string'
+ length: int - used when data_type=='string'
+ returns
+ None - if extraction failed.
+ obj - based on what is requested in data_type
+ """
+ unpack_str = "s"
+ if data_type == 'uint64_t':
+ length = 8
+ unpack_str = "Q"
+ elif data_type == "uint32_t":
+ length = 4
+ unpack_str = "I"
+ else:
+ unpack_str= "%ds" % length
+
+ data_len = len(strdata)
+ if offset > data_len or (offset + length) > data_len or offset < 0:
+ debuglog("Invalid arguments to _ExtractDataFromString.")
+ return 0
+ return struct.unpack(unpack_str, strdata[offset:(offset + length)])[0]
+
+def GetPathForImage(task, path_address):
+ """ Maps 32 bytes at a time and packs as string
+ params:
+ task: obj - referencing task to read data from
+ path_address: int - address where the image path is stored
+ returns:
+ str - string path of the file. "" if failed to read.
+ """
+ done = False
+ retval = ""
+
+ if path_address == 0:
+ done = True
+
+ while not done:
+ path_str_data = GetUserDataAsString(task, path_address, 32)
+ if len(path_str_data) == 0:
+ break
+ i = 0
+ while i < 32:
+ if ord(path_str_data[i]):
+ retval += path_str_data[i]
+ else:
+ break
+ i += 1
+ if i < 32:
+ done = True
+ else:
+ path_address += 32
+ return retval
+
+def GetImageInfo(task, mh_image_address, mh_path_address, approx_end_address=None):
+ """ Print user library informaiton.
+ params:
+ task : obj referencing the task for which Image info printed
+ mh_image_address : int - address which has image info
+ mh_path_address : int - address which holds path name string
+ approx_end_address: int - address which lldbmacros think is end address.
+ returns:
+ str - string representing image info. "" if failure to read data.
+ """
+ if approx_end_address:
+ image_end_load_address = int(approx_end_address) -1
+ else:
+ image_end_load_address = int(mh_image_address) + 0xffffffff
+
+ print_format = "0x{0:x} - 0x{1:x} {2: <50s} (??? - ???) <{3: <36s}> {4: <50s}"
+ # 32 bytes enough for mach_header/mach_header_64
+ mh_data = GetUserDataAsString(task, mh_image_address, 32)
+ if len(mh_data) == 0:
+ debuglog("unable to get userdata for task 0x{:x} img_addr 0x{:x} path_address 0x{:x}".format(
+ task, mh_image_address, mh_path_address))
+ return ""
+ mh_magic = _ExtractDataFromString(mh_data, (4 * 0), "uint32_t")
+ mh_cputype = _ExtractDataFromString(mh_data,(4 * 1), "uint32_t")
+ mh_cpusubtype = _ExtractDataFromString(mh_data,(4 * 2), "uint32_t")
+ mh_filetype = _ExtractDataFromString(mh_data,(4 * 3), "uint32_t")
+ mh_ncmds = _ExtractDataFromString(mh_data,(4 * 4), "uint32_t")
+ mh_sizeofcmds = _ExtractDataFromString(mh_data,(4 * 5), "uint32_t")
+ mh_flags = _ExtractDataFromString(mh_data,(4 * 6), "uint32_t")
+
+ if mh_magic == 0xfeedfacf:
+ mh_64 = True
+ lc_address = mh_image_address + 32
+ else:
+ mh_64 = False
+ lc_address = mh_image_address + 28
+
+ lc_idx = 0
+ uuid_data = 0
+ found_uuid_data = False
+ retval = None
+ while lc_idx < mh_ncmds:
+ # 24 bytes is the size of uuid_command
+ lcmd_data = GetUserDataAsString(task, lc_address, 24)
+ lc_cmd = _ExtractDataFromString(lcmd_data, 4 * 0, "uint32_t")
+ lc_cmd_size = _ExtractDataFromString(lcmd_data, 4 * 1, "uint32_t")
+ lc_data = _ExtractDataFromString(lcmd_data, 4*2, "string", 16)
+
+ uuid_out_string = ""
+ path_out_string = ""
+
+ if lc_cmd == 0x1b:
+ # need to print the uuid now.
+ uuid_data = [ord(x) for x in lc_data]
+ found_uuid_data = True
+ uuid_out_string = "{a[0]:02X}{a[1]:02X}{a[2]:02X}{a[3]:02X}-{a[4]:02X}{a[5]:02X}-{a[6]:02X}{a[7]:02X}-{a[8]:02X}{a[9]:02X}-{a[10]:02X}{a[11]:02X}{a[12]:02X}{a[13]:02X}{a[14]:02X}{a[15]:02X}".format(a=uuid_data)
+ #also print image path
+ path_out_string = GetPathForImage(task, mh_path_address)
+ path_base_name = path_out_string.split("/")[-1]
+ retval = print_format.format(mh_image_address, image_end_load_address, path_base_name, uuid_out_string, path_out_string)
+ elif lc_cmd == 0xe:
+ ShowTaskUserLibraries.exec_load_path = lc_address + _ExtractDataFromString(lcmd_data, 4*2, "uint32_t")
+ lc_address = lc_address + lc_cmd_size
+ lc_idx += 1
+
+ if not found_uuid_data:
+ path_out_string = GetPathForImage(task, mh_path_address)
+ path_base_name = path_out_string.split("/")[-1]
+ uuid_out_string = ""
+
+ retval = print_format.format(mh_image_address, image_end_load_address, path_base_name, uuid_out_string, path_out_string)
+ return retval
+
+@static_var("found_images", []) # holds entries of format (startaddr, endaddr, image_path_addr, infostring)
+@static_var("exec_load_path", 0)
+@lldb_command("showtaskuserlibraries")
+def ShowTaskUserLibraries(cmd_args=None):
+ """ Show binary images known by dyld in target task
+ For a given user task, inspect the dyld shared library state and print information about all Mach-O images.
+ Syntax: (lldb)showtaskuserlibraries <task_t>
+ Note: the address ranges are approximations. Also the list may not be completely accurate. This command expects memory read failures
+ and hence will skip a library if unable to read information. Please use your good judgement and not take the output as accurate
+ """
+ if not cmd_args:
+ raise ArgumentError("Insufficient arguments")
+
+ #reset the found_images array
+ ShowTaskUserLibraries.found_images = []
+
+ task = kern.GetValueFromAddress(cmd_args[0], 'task_t')
+ is_task_64 = int(task.t_flags) & 0x1
+ dyld_all_image_infos_address = unsigned(task.all_image_info_addr)
+ cur_data_offset = 0
+ if dyld_all_image_infos_address == 0:
+ print "No dyld shared library information available for task"
+ return False
+ vers_info_data = GetUserDataAsString(task, dyld_all_image_infos_address, 112)
+ version = _ExtractDataFromString(vers_info_data, cur_data_offset, "uint32_t")
+ cur_data_offset += 4
+ if version > 12:
+ print "Unknown dyld all_image_infos version number %d" % version
+ image_info_count = _ExtractDataFromString(vers_info_data, cur_data_offset, "uint32_t")
+ ShowTaskUserLibraries.exec_load_path = 0
+ if is_task_64:
+ image_info_size = 24
+ image_info_array_address = _ExtractDataFromString(vers_info_data, 8, "uint64_t")
+ dyld_load_address = _ExtractDataFromString(vers_info_data, 8*4, "uint64_t")
+ dyld_all_image_infos_address_from_struct = _ExtractDataFromString(vers_info_data, 8*13, "uint64_t")
+ else:
+ image_info_size = 12
+ image_info_array_address = _ExtractDataFromString(vers_info_data, 4*2, "uint32_t")
+ dyld_load_address = _ExtractDataFromString(vers_info_data, 4*5, "uint32_t")
+ dyld_all_image_infos_address_from_struct = _ExtractDataFromString(vers_info_data, 4*14, "uint32_t")
+ # Account for ASLR slide before dyld can fix the structure
+ dyld_load_address = dyld_load_address + (dyld_all_image_infos_address - dyld_all_image_infos_address_from_struct)
+
+ i = 0
+ image_info_list = []
+ while i < image_info_count:
+ image_info_address = image_info_array_address + i * image_info_size
+ n_im_info_addr = None
+ img_data = ""
+ try:
+ img_data = GetUserDataAsString(task, image_info_address, image_info_size)
+ except Exception, e:
+ debuglog("Failed to read user data for task 0x{:x} addr 0x{:x}, exception {:s}".format(task, image_info_address, str(e)))
+ pass
+ if is_task_64:
+ image_info_addr = _ExtractDataFromString(img_data, 0, "uint64_t")
+ image_info_path = _ExtractDataFromString(img_data, 8, "uint64_t")
+ else:
+ image_info_addr = _ExtractDataFromString(img_data, 0, "uint32_t")
+ image_info_path = _ExtractDataFromString(img_data, 4, "uint32_t")
+
+ if image_info_addr :
+ image_info_list.append((image_info_addr, image_info_path))
+ i += 1
+
+ image_info_list.sort()
+ num_images_found = len(image_info_list)
+
+ for ii in range(num_images_found):
+ n_im_info_addr = dyld_load_address
+ if ii + 1 < num_images_found:
+ n_im_info_addr = image_info_list[ii+1][0]
+
+ image_info_addr = image_info_list[ii][0]
+ image_info_path = image_info_list[ii][1]
+ try:
+ image_print_s = GetImageInfo(task, image_info_addr, image_info_path, approx_end_address=n_im_info_addr)
+ if len(image_print_s) > 0:
+ print image_print_s
+ ShowTaskUserLibraries.found_images.append((image_info_addr, n_im_info_addr, image_info_path, image_print_s))
+ else:
+ debuglog("Failed to print image info for task 0x{:x} image_info 0x{:x}".format(task, image_info_addr))
+ except Exception,e:
+ if config['debug']:
+ raise e
+
+ # load_path might get set when the main executable is processed.
+ if ShowTaskUserLibraries.exec_load_path != 0:
+ image_print_s = GetImageInfo(task, dyld_load_address, ShowTaskUserLibraries.exec_load_path)
+ if len(image_print_s) > 0:
+ print image_print_s
+ ShowTaskUserLibraries.found_images.append((dyld_load_address, dyld_load_address + 0xffffffff,
+ ShowTaskUserLibraries.exec_load_path, image_print_s))
+ else:
+ debuglog("Failed to print image for main executable for task 0x{:x} dyld_load_addr 0x{:x}".format(task, dyld_load_address))
+ return
+
+
+
projects / apple / xnu.git / blobdiff