GitHub - geekonion/YJLLDB: LLDB commands for iOS debugging and reverse engineering.

Clone this repo
Open up (or create) ~/.lldbinit
Add the following command to your ~/.lldbinit file: command script import /path/to/YJLLDB/src/yjlldb.py

Usage

Breakpoint:

bab - break at bytes

Set breakpoints at the specified bytes in user modules.

// for example, break at ret
(lldb) bab c0 03 5f d6
Breakpoint 1: where = LLDBCode`-[ViewController viewDidLoad] + 240 at ViewController.m:29:1, address = 0x1029b3008
...
set 728 breakpoints

(lldb) x 0x1029b3008
0x1029b3008: c0 03 5f d6 ff 03 03 d1 fd 7b 0b a9 fd c3 02 91  .._......{......
0x1029b3018: e8 03 01 aa e1 03 02 aa e3 0f 00 f9 a0 83 1f f8  ................
(lldb) dis -s 0x1029b3008 -c 1
LLDBCode`-[ViewController viewDidLoad]:
    0x1029b3008 <+240>: ret

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baf - break all functions in module

Break all functions and methods in the specified module.

For example，break Foundation:

(lldb) baf Foundation
-----break functions in Foundation-----
will set breakpoint for 13880 names
Breakpoint 4: 13961 locations

bdc - breakpoint disable current

Disable current breakpoint and continue.

(lldb) thread info
thread #1: tid = 0x2cb739, 0x000000018354f950 libsystem_kernel.dylib`open, queue = 'com.apple.main-thread', stop reason = breakpoint 5.13

(lldb) bdc
disable breakpoint 5.13 [0x18354f950]libsystem_kernel.dylib`open
and continue

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bda - breakpoint disable at class

Disable breakpoint(s) at the specified class.

(lldb) bda -i ViewController
disable breakpoint 1.8: where = LLDBCode`__41-[ViewController touchesBegan:withEvent:]_block_invoke_4 at ViewController.m:57, address = 0x00000001040e32f8, unresolved, hit count = 1  Options: disabled 
...
disable breakpoint 1.27: where = LLDBCode`__41-[ViewController touchesBegan:withEvent:]_block_invoke at ViewController.m:45, address = 0x00000001040e318c, unresolved, hit count = 1  Options: disabled 

(lldb) bda -i ViewController(extension)
disable breakpoint 1.23: where = LLDBCode`-[ViewController(extension) test] at ViewController.m:20, address = 0x0000000102ec2e7c, unresolved, hit count = 0  Options: disabled

bdr - breakpoint disable in range

Disable breakpoint(s) in the specified range.

(lldb) bdr 980~992
disable breakpoint 980.1: where = LLDBCode`-[Test .cxx_destruct] at Test.m:22, address = 0x00000001049fa1b0, unresolved, hit count = 0  Options: disabled 
...
disable breakpoint 991.1: where = LLDBCode`func1 at Test.m:42, address = 0x00000001049faaf8, unresolved, hit count = 0  Options: disabled

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bblocks - break blocks (arm64 only)

Break all blocks in user modules

(lldb) bblocks
-----try to lookup block in JITDemo-----
break block: 0x104a78150 with Breakpoint 4: JITDemo`globalBlock_block_invoke at ViewController.m:16:0, address = 0x104a74990
...
break stack block with Breakpoint 9: JITDemo`__41-[ViewController touchesBegan:withEvent:]_block_invoke_4 at ViewController.m:75:0, address = 0x104a74f08
...
-----try to lookup block in LLDBJIT-----
break block: 0x104b341c0 with Breakpoint 82: LLDBJIT`__22+[MachoTool findMacho]_block_invoke at MachoTool.m:110:0, address = 0x104b2b130
...
find a stack block @0x104b32080 in LLDBJIT`+[Image getBlocksInfo:] at Image.m:0:0
break stack block with Breakpoint 88: LLDBJIT`None, address = 0x104b34d40
set 85 breakpoints
(lldb)

or

(lldb) bblocks JITDemo
-----try to lookup block in JITDemo-----
break block: 0x1026ac140 with Breakpoint 87: JITDemo`___lldb_unnamed_symbol75, address = 0x1026a92f4
...
find a stack block @0x1026a9694 in JITDemo`___lldb_unnamed_symbol82
break stack block with Breakpoint 93: JITDemo`___lldb_unnamed_symbol83, address = 0x1026a9700
set 7 breakpoints

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binitfunc - break init func

Break module init function(s) of specified module.

(lldb) binitfunc
-----try to lookup init function in JITDemo-----
mod init func pointers found: __DATA,__mod_init_func
Breakpoint 6: JITDemo`entry1 at main.m:708:0, address = 0x100e08cb0
Breakpoint 7: JITDemo`entry2 at main.m:740:0, address = 0x100e0960c

bmethod - break method

Break the specified method(s) in user modules

(lldb) bmethod load
-----try to method in JITDemo-----
Breakpoint 3: JITDemo`+[ViewController load] at ViewController.m:26:0, address = 0x1024f89bc
Breakpoint 4: JITDemo`+[AppDelegate load] at AppDelegate.m:16:0, address = 0x1024f96a4
-----try to method in LLDBJIT-----
set 2 breakpoints

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bmain - break main function

(lldb) bmain
Breakpoint 9: BasicSyntax`___lldb_unnamed_symbol266, address = 0x10017c3fc

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Search:

slookup - lookup string

Lookup the specified string, between start addr and end addr.

(lldb) image_list -c 8
index   load addr(slide)       vmsize path
--------------------------------------------------------
[  0] 0x1022e4000(0x0022e4000)  81.9K /var/containers/Bundle/Application/C134E909-CC52-4A93-9557-37BA808854D3/LLDBCode.app/LLDBCode
...
[  6] 0x18406f000(0x004044000)   8.7K /usr/lib/libSystem.B.dylib
[  7] 0x184071000(0x004044000) 394.1K /usr/lib/libc++.1.dylib
  
(lldb) slookup PROGRAM 0x18406f000 0x184071000
found at 0x184070f7c where = [0x000000018002cf78-0x000000018002cfb8) libSystem.B.dylib.__TEXT.__const
1 locations found

(lldb) x 0x184070f7c -c 64
0x184070f7c: 50 52 4f 47 52 41 4d 3a 53 79 73 74 65 6d 2e 42  PROGRAM:System.B
0x184070f8c: 20 20 50 52 4f 4a 45 43 54 3a 4c 69 62 73 79 73    PROJECT:Libsys
0x184070f9c: 74 65 6d 2d 31 32 35 32 2e 35 30 2e 34 0a 00 00  tem-1252.50.4...
0x184070fac: 00 00 00 00 00 00 00 00 00 92 93 40 01 00 00 00  ...........@....

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blookup - lookup bytes

Lookup the specified bytes in user modules.

(lldb) blookup c0 03 5f d6
-----try to lookup bytes in LLDBCode-----
0x104961018
...
0x104969ab8
32 locations found

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fblock - find block (arm64 only)

Find the specified block(s) in user modules.

(lldb) po $x0
<__NSGlobalBlock__: 0x100f18210>
(lldb) x/4g 0x100f18210
0x100f18210: 0x00000001b57df288 0x0000000050000000
0x100f18220: 0x00000001043b9724 0x00000001043bc1f0
(lldb) info 0x00000001043b9724
0x00000001043b9724,   ___lldb_unnamed_symbol77     <+0> `JITDemo`__TEXT.__text + 0x290

(lldb) fblock 0x100f18210
-----try to lookup block in JITDemo-----
find a block: 0x100f18210 in JITDemo`-[ViewController touchesBegan:withEvent:]
1 block(s) resolved

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blocks - find blocks (arm64 only)

Find blocks in user modules and save block symbols to block_symbol.json

(lldb) blocks
-----try to lookup block in JITDemo-----
* using global block var: 0x104a78150 in JITDemo`-[ViewController viewDidLoad] at ViewController.m:39:5
find a block: 0x104a78190 in JITDemo`-[ViewController viewDidLoad] at ViewController.m:0:0
...
find a stack block @0x104a74e7c in JITDemo`__41-[ViewController touchesBegan:withEvent:]_block_invoke_3 at ViewController.m:0:0
	stack block func addr 0x104a74f08 JITDemo`__41-[ViewController touchesBegan:withEvent:]_block_invoke_4 at ViewController.m:75:0
...
-----try to lookup block in LLDBJIT-----
find a block: 0x104b341c0 in LLDBJIT`+[MachoTool findMacho] at MachoTool.m:0:0
...
find a stack block @0x104b32080 in LLDBJIT`+[Image getBlocksInfo:] at Image.m:0:0
	stack block func addr 0x104b34d40 LLDBJIT`None
85 block(s) resolved

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ffunc - find function

find function by callee function name

(lldb) ffunc -n open -i 5900
-----parsing module Demo-----
	function call found at: 0x1057c09b0, where = Demo`___lldb_unnamed_symbol255344 + 88

find function by callee funcation address

(lldb) ffunc -a 0x1005106a0 -i 5000
-----parsing module Demo-----
	function call found at: 0x10050dcd8, where = Demo`test_func + 2360

find function by c string

(lldb) ffunc -k test -i 700 -x 800
-----parsing module Demo-----
	keyword test found at 0x105bb5227

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overridden_method

(lldb) overridden_method

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Trace:

mtrace - trace module

Trace all functions in the specified module. By default, only OC methods are traced. To trace swift module, you need to add the -a option.

// begin trace
(lldb) mtrace LLDBCode
-----trace functions in LLDBCode-----
will trace 35 names
begin trace with Breakpoint 1: 35 locations
(lldb) c

// trace log
frame #0: 0x0000000102dd2fb8 LLDBCode`-[ViewController touchesBegan:withEvent:](self=0x00000001d4108040, _cmd="touchesBegan:withEvent:", touches=0x000000015fd0fff0, event=1 element) at ViewController.m:35
...
frame #0: 0x0000000102dd318c LLDBCode`__41-[ViewController touchesBegan:withEvent:]_block_invoke(.block_descriptor=0x0000000102ec1500) at ViewController.m:45

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rtrace

trace functions using regular expressions

(lldb) rtrace -i GetDeviceInfo
begin trace with Breakpoint 4: where = CoreTelephony`_CTServerConnectionPhoneServicesGetDeviceInfo, address = 0x1bab0f6a0
...
begin trace with Breakpoint 8: where = MediaRemote`MRMediaRemoteGetDeviceInfo, address = 0x1c85b4c84
begin trace with 5 breakpoint(s)

notifier

trace notificaton posting action

(lldb) notifier
begin trace -[NSNotificationCenter postNotification:] with Breakpoint 8
begin trace -[NSNotificationCenter postNotificationName:object:userInfo:] with Breakpoint 9
begin trace CFNotificationCenterPostNotificationWithOptions with Breakpoint 10

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Patch:

patch (private)

Patch bytes in user modules.

(lldb) patch c0 03 5f d6
-----try to patch bytes in LLDBCode-----
patch 32 locations

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Dump:

dmodule - dump module (private)

Dump the specified module from memory.

(lldb) dmodule UIKit
dumping UIKit, this may take a while
ignore __DATA.__bss
ignore __DATA.__common
ignore __DATA_DIRTY.__bss
ignore __DATA_DIRTY.__common
924057600 bytes dump to ~/lldb_dump_macho/UIKit/macho_UIKit

注意：加载时被修改的数据未恢复

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dapp - dump App (private)

Dump current iOS App (arm64 only). Typically, dump decrypted ipa from jailbreak device.

(lldb) dapp
dumping JITDemo, this may take a while
copy file JITDemo.app/Base.lproj/LaunchScreen.storyboardc/01J-lp-oVM-view-Ze5-6b-2t3.nib
...
copy file JITDemo.app/embedded.mobileprovision
no file need patch
Generating "JITDemo.ipa"
dump success, ipa path: /Users/xxx/lldb_dump_macho/JITDemo/JITDemo.ipa

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Shell command

addcmd

Add a lldb command for mac command line tool.

(lldb) addcmd which
Add command script successfully, try using it
(lldb) which
usage: which [-as] program ...
(lldb) which ls
/bin/ls

delcmd

Delete lldb command added by addcmd.

(lldb) delcmd which
command "which" has been deleted
(lldb) which
error: 'which' is not a valid command.

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pwd

(lldb) pwd
/Users/xxx

cd

(lldb) cd /
(lldb) pwd
/

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ls

List directory contents on Mac.

(lldb) ls -l
total 10
drwxrwxr-x  61 root  admin  1952 Jul  4 12:28 Applications
drwxr-xr-x  71 root  wheel  2272 May 21 09:49 Library
drwxr-xr-x@ 10 root  wheel   320 May  7 15:01 System
drwxr-xr-x   5 root  admin   160 May 21 09:48 Users
drwxr-xr-x   4 root  wheel   128 Jul  4 12:29 Volumes
drwxr-xr-x@ 39 root  wheel  1248 May  7 15:01 bin
drwxr-xr-x   2 root  wheel    64 Jul 14  2022 cores
dr-xr-xr-x   3 root  wheel  4982 Jul  2 16:28 dev
lrwxr-xr-x@  1 root  wheel    11 May  7 15:01 etc -> private/etc
lrwxr-xr-x   1 root  wheel    25 Jul  2 16:29 home -> /System/Volumes/Data/home
drwxr-xr-x   4 root  wheel   128 May 16 14:10 opt
drwxr-xr-x   6 root  wheel   192 Jul  2 16:29 private
drwxr-xr-x@ 64 root  wheel  2048 May  7 15:01 sbin
lrwxr-xr-x@  1 root  wheel    11 May  7 15:01 tmp -> private/tmp
drwxr-xr-x@ 11 root  wheel   352 May  7 15:01 usr
lrwxr-xr-x@  1 root  wheel    11 May  7 15:01 var -> private/var

File:

commads to get common directory

(lldb) bundle_dir
/var/containers/Bundle/Application/63954B0E-79FA-42F2-A7EA-3568026008A1/Interlock.app
(lldb) home_dir
/var/mobile/Containers/Data/Application/1161FDFD-5D69-47CD-B5C6-C2724B8E2F28
(lldb) doc_dir
/var/mobile/Containers/Data/Application/1161FDFD-5D69-47CD-B5C6-C2724B8E2F28/Documents
(lldb) caches_dir
/var/mobile/Containers/Data/Application/1161FDFD-5D69-47CD-B5C6-C2724B8E2F28/Library/Caches
(lldb) lib_dir
/var/mobile/Containers/Data/Application/1161FDFD-5D69-47CD-B5C6-C2724B8E2F28/Library
(lldb) tmp_dir
/var/mobile/Containers/Data/Application/1161FDFD-5D69-47CD-B5C6-C2724B8E2F28/tmp
(lldb) group_dir
/private/var/mobile/Containers/Shared/AppGroup/9460EA21-AE6A-4220-9BB3-6EC8B971CDAE

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ils

List directory contents on remote device, just like ls -lh on Mac.

(lldb) ils bu
/var/containers/Bundle/Application/D0419A6E-053C-4E35-B422-7C0FD6CAB060/Interlock.app
drwxr-xr-x        128B 1970-01-01 00:00:00 +0000 Base.lproj
drwxr-xr-x         96B 1970-01-01 00:00:00 +0000 _CodeSignature
drwxr-xr-x         64B 1970-01-01 00:00:00 +0000 META-INF
-rw-r--r--        1.5K 2023-05-16 03:17:32 +0000 Info.plist
-rwxr-xr-x      103.0K 2023-05-19 11:07:02 +0000 Interlock
-rw-r--r--          8B 2023-05-16 03:17:32 +0000 PkgInfo
-rw-r--r--      194.7K 2023-05-16 03:17:31 +0000 embedded.mobileprovision
(lldb) ils home
/var/mobile/Containers/Data/Application/09E63130-623F-4124-BCBB-59E20BD28964
drwxr-xr-x         96B 2023-05-19 07:28:01 +0000 Documents
drwxr-xr-x        128B 2023-05-16 04:51:14 +0000 Library
drwxr-xr-x         64B 1970-01-01 00:00:00 +0000 SystemData
drwxr-xr-x         64B 2023-05-16 04:51:14 +0000 tmp
(lldb) ils /var/mobile/Containers/Data/Application/09E63130-623F-4124-BCBB-59E20BD28964/Documents
-rw-r--r--         18B 2023-05-16 05:36:05 +0000 report.txt

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dfile - download file

Download file from home, bundle or group path.

(lldb) dfile /var/containers/Bundle/Application/7099B2B8-39BE-4204-9BEB-5DF6A75BAA29/JITDemo.app/Info.plist
dumping Info.plist, this may take a while
1464 bytes written to '/Users/xxx/Info.plist'

or

(lldb) dfile bundle/Info.plist
dumping Info.plist, this may take a while
1464 bytes written to '/Users/xxx/Info.plist'

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ddir - download directory

Download dir from home, bundle or group path.

(lldb) ddir /var/containers/Bundle/Application/7099B2B8-39BE-4204-9BEB-5DF6A75BAA29/JITDemo.app
dumping JITDemo.app, this may take a while
1197 bytes written to '/Users/xxx/JITDemo.app/Base.lproj/LaunchScreen.storyboardc/01J-lp-oVM-view-Ze5-6b-2t3.nib'
...
8 bytes written to '/Users/xxx/JITDemo.app/PkgInfo'
196731 bytes written to '/Users/xxx/JITDemo.app/embedded.mobileprovision'

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ufile - upload local file to device

Upload local file to the specified directory or path on device.

(lldb) doc
/var/mobile/Containers/Data/Application/1171F451-C2DC-47E6-B6E3-74A0FE5A6572/Documents
(lldb) ufile /Users/xxx/uploadfile /var/mobile/Containers/Data/Application/1171F451-C2DC-47E6-B6E3-74A0FE5A6572/Documents
uploading uploadfile, this may take a while
upload success
(lldb) ufile /Users/xxx/uploadfile /var/mobile/Containers/Data/Application/1171F451-C2DC-47E6-B6E3-74A0FE5A6572/Documents/test
uploading uploadfile, this may take a while
upload success
(lldb) ils doc
/var/mobile/Containers/Data/Application/1171F451-C2DC-47E6-B6E3-74A0FE5A6572/Documents
-rw-r--r--       12.1K 2023-08-10 07:11:29 +0000 test
-rw-r--r--       12.1K 2023-08-10 07:11:22 +0000 uploadfile

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irm - remove file

Remove file or directory on remote device.

(lldb) ils doc
/var/mobile/Containers/Data/Application/B142040E-B1A0-4E97-8E76-03357585BFF8/Documents
-rw-r--r--       12.1K 2023-08-10 07:32:05 +0000 test
-rw-r--r--       12.1K 2023-08-10 08:22:40 +0000 uploadfile
(lldb) irm /var/mobile/Containers/Data/Application/B142040E-B1A0-4E97-8E76-03357585BFF8/Documents/uploadfile
remove success
(lldb) ils doc
/var/mobile/Containers/Data/Application/B142040E-B1A0-4E97-8E76-03357585BFF8/Documents
-rw-r--r--       12.1K 2023-08-10 07:32:05 +0000 test

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Module:

image_list

List current executable and dependent shared library images, sorted by load address.

(lldb) image_list
index     load_addr(slide)     vmsize path
------------------------------------------------------------
[  0] 0x1048dc000(0x0048dc000) 655.4K /private/var/containers/Bundle/Application/D5752641-F291-4170-9576-67D8011C88D3/JITDemo.app
[  1] 0x10497c000(0x10497c000) 131.1K /Users/xxx/Library/Developer/Xcode/DerivedData/LLDBJIT-xxx/Build/Products/Debug-iphoneos/JITDemo.app/Frameworks/LLDBJIT.framework/LLDBJIT
...

(lldb) image_list -v
index    load_addr - end_addr(slide)         vmsize arch  uuid   path
------------------------------------------------------------
[  0] 0x1048dc000 - 0x10497c000(0x0048dc000) 655.4K arm64 5B4BAB05-B614-339D-909E-1877AA53AD11 /private/var/containers/Bundle/Application/D5752641-F291-4170-9576-67D8011C88D3/JITDemo.app
[  1] 0x10497c000 - 0x10499c000(0x10497c000) 131.1K arm64 E8938575-D438-3175-B846-B60CF9DE0304 /Users/xxx/Library/Developer/Xcode/DerivedData/LLDBJIT-xxx/Build/Products/Debug-iphoneos/JITDemo.app/Frameworks/LLDBJIT.framework/LLDBJIT
...

(lldb) image_list -u
index     load_addr(slide)     vmsize path
------------------------------------------------------------
[  0] 0x1022f8000(0x0022f8000)  98.3K /private/var/containers/Bundle/Application/5DD99AF7-20FE-4369-AD0B-6A898DB12171/JITDemo.app
[  1] 0x1024cc000(0x1024cc000) 147.5K /Users/xxx/Library/Developer/Xcode/DerivedData/LLDBJIT-bwkzhcqdptajftbnezhkwkpwqlqb/Build/Products/Debug-iphoneos/JITDemo.app/Frameworks/LLDBJIT.framework/LLDBJIT
[  2] 0x1027a0000(0x1027a0000) 655.4K /Users/xxx/Library/Developer/Xcode/DerivedData/LLDBJIT-bwkzhcqdptajftbnezhkwkpwqlqb/Build/Products/Debug-iphoneos/JITDemo.app/JITDemo.debug.dylib

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info_plist - print Info.plist

(lldb) info_plist
-----parsing module Demo-----
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	...
</dict>
</plist>

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executable - print main executable name

Print main executable name.

(lldb) executable
LLDBCode

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appdelegate

Find the class that conforms to the UIApplicationDelegate protocol.

(lldb) appdelegate
AppDelegate

mname - module name

Get module name with header address.

(lldb) p/x header
(const mach_header *) 0x1043e8000

(lldb) mname 0x1043e8000
LLDBCode

(lldb) mname header
LLDBCode

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segments - print segments

Print segments and section info of macho.

(lldb) segments JITDemo
-----parsing module JITDemo-----
       [start - end)			size		name
------------------------------------------------------------
[0x497c000  -0x10497c000)		0x100000000 __PAGEZERO
------------------------------------------------------------
[0x10497c000-0x104984000)		0x8000      __TEXT
	[0x104980000-0x1049811b0)	0x11b0        __text
	[0x1049811b0-0x104981270)	0xc0          __stubs
	[0x104981270-0x104981348)	0xd8          __stub_helper
	[0x104981348-0x1049815a8)	0x260         __objc_stubs
	[0x1049815a8-0x1049824e5)	0xf3d         __objc_methname
	[0x1049824e5-0x104982736)	0x251         __cstring
	[0x104982736-0x1049827b5)	0x7f          __objc_classname
	[0x1049827b5-0x1049832de)	0xb29         __objc_methtype
	[0x1049832e0-0x104983360)	0x80          __unwind_info
------------------------------------------------------------
[0x104984000-0x104988000)		0x4000      __DATA
	[0x104984000-0x104984030)	0x30          __got
	[0x104984030-0x1049840b0)	0x80          __la_symbol_ptr
	[0x1049840b0-0x1049841f0)	0x140         __cfstring
	[0x1049841f0-0x104984210)	0x20          __objc_classlist
	[0x104984210-0x104984218)	0x8           __objc_nlclslist
	[0x104984218-0x104984238)	0x20          __objc_protolist
	[0x104984238-0x104984240)	0x8           __objc_imageinfo
	[0x104984240-0x104985408)	0x11c8        __objc_const
	[0x104985408-0x1049854a8)	0xa0          __objc_selrefs
	[0x1049854a8-0x1049854e0)	0x38          __objc_classrefs
	[0x1049854e0-0x1049854e8)	0x8           __objc_superrefs
	[0x1049854e8-0x1049854f0)	0x8           __objc_ivar
	[0x1049854f0-0x104985630)	0x140         __objc_data
	[0x104985630-0x1049857c0)	0x190         __data
	[0x1049857c0-0x104985800)	0x40          __common
	[0x104985800-0x104985818)	0x18          __bss
------------------------------------------------------------
[0x104988000-0x104994000)		0xc000      __LINKEDIT
	[0x1049887c0-0x1049887f0)	0x30          Function Starts
	[0x1049887f0-0x104989d10)	0x1520        Symbol Table
	[0x1049887f0-0x1049887f0)	0x0           Data In Code Entries
	[0x104989d10-0x104989da8)	0x98          Dynamic Symbol Table
	[0x104989da8-0x10498b470)	0x16c8        String Table
	[0x10498b470-0x104990140)	0x4cd0        Code Signature

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main

Print the address of main function.

(lldb) main
function main at 0x102911b70, fileoff: 0x5b70

initfunc - print init func

Dump module init function(s) of specified module.

(lldb) initfunc
-----try to lookup init function in JITDemo-----
mod init func pointers found: __DATA,__mod_init_func
address = 0x100e08cb0 JITDemo`entry1 at main.m:708:0
address = 0x100e0960c JITDemo`entry2 at main.m:740:0

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func_starts - function starts

Print function starts

(lldb) func_starts
-----parsing module JITDemo-----
address = 0x1021bc5c8 size = 64 where = JITDemo`globalBlock_block_invoke at ViewController.m:17
address = 0x1021bc608 size = 20 where = JITDemo`+[ViewController load] at ViewController.m:27
...
address = 0x1021bdae0 size = 56 where = JITDemo`-[SceneDelegate .cxx_destruct] at SceneDelegate.m:14
(lldb)

got - print `__got` section

(lldb) got
-----parsing module JITDemo-----
address = 0x1ac734ce0 where = where = Foundation`NSFileModificationDate -> NSFileModificationDate (not a function)
...
address = 0x180d44900 where = libobjc.A.dylib`objc_msgSend (matched)
address = 0x1814ce1c0 where = libdyld.dylib`dyld_stub_binder (matched)
13 location(s) found

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lazy_sym - print `__la_symbol_ptr` section

(lldb) lazy_sym
-----parsing module JITDemo-----
address = 0x104c7fe14 where = JITDemo`my_NSHomeDirectory at ViewController.m:63 -> Foundation`NSHomeDirectory
...
address = 0x1815fb950 where = libsystem_kernel.dylib`open (matched)
36 location(s) found

entitlements - dump entitlements

Dump codesign entitlements of the specified module if any.

(lldb) ent
Interlock:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>application-identifier</key>
	<string>XXXX.com.xxx.Interlock</string>
	<key>com.apple.developer.team-identifier</key>
	<string>XXXX</string>
	<key>com.apple.security.application-groups</key>
	<array/>
	<key>get-task-allow</key>
	<true/>
</dict>
</plist>

(lldb) ent UIKit
UIKit apparently does not contain code signature

Dump bundle ID in the codesign entitlements.

(lldb) ent -b
TeamID.com.xxx.LLDBCode

Dump team ID in the codesign entitlements.

(lldb) ent -t
TeamID

Dump group ID(s) in the codesign entitlements.

(lldb) ent -g
['group.com.xxx.JITDemo']

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Objc

classes - print class names

Print class names in the specified module.

(lldb) classes
AppDelegate <0x10468e378>
SceneDelegate <0x10468e418>
ViewController <0x10468e260>

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dmethods

Dumps all methods implemented by the NSObject subclass, supporting both iOS and MacOS.

(lldb) dmethods ViewController
<ViewController: 0x1021c9b48>:
in ViewController:
	Properties:
		@property unsigned long test;  (@synthesize test = _test;)
	Instance Methods:
		- (void) setRepresentedObject:(id)arg1; (0x1021c7020)
		- (void) setTest:(unsigned long)arg1; (0x1021c7190)
		- (unsigned long) test; (0x1021c7170)
		- (void) viewDidLoad; (0x1021c6e90)
(NSViewController ...)

divars

Dumps all ivars for an instance of a particular class which inherits from NSObject, supporting both iOS and MacOS.

(lldb) divars ViewController
in ViewController:
	_test (unsigned long): {length = 8, bytes = 0x5a00ab0000000000}

duplicate_class

(lldb) duplicate_class
class DDContextAllowlistFilterLogFormatter is implemented in:
	/JITDemo.app/Frameworks/JITMiddleWareSDK.framework/JITMiddleWareSDK
	/JITDemo.app/Frameworks/LLDBLog.framework/LLDBLog
...
class DDLoggingContextSet is implemented in:
	/JITDemo.app/Frameworks/LLDBJIT.framework/JITMiddleWareSDK
	/JITDemo.app/Frameworks/LLDBLog.framework/LLDBLog
24 duplicate classes were found

Assembly

inst2bytes

Convert assembly instructions to machine code.

(lldb) inst2bytes 'mov    x9, sp;mov    x8, x0'
disassembly: 
       0: 910003e9     	mov	x9, sp
       4: aa0003e8     	mov	x8, x0
machine code: e9030091e80300aa

bytes2inst

Convert machine code to assembly instructions.

(lldb) bytes2inst e9030091e80300aa
<+0>:	mov	x9, sp
<+4>:	mov	x8, x0

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Memory:

read_mem_as_addr

(lldb) seg
...
------------------------------------------------------------
[0x102ee0000-0x102ee4000)		0x4000      __DATA
	[0x102ee0000-0x102ee0000)	0x68          __got
...
	[0x102ee02e0-0x102ee0560)	0x280         __cfstring
...

// read __got section
(lldb) read_mem_as_addr 0x102ee0000 0x102ee0068
0x102ee0000: 0x00000001ac734ce0 Foundation`NSFileModificationDate
...
0x102ee0058: 0x0000000180d44900 libobjc.A.dylib`objc_msgSend
0x102ee0060: 0x00000001814ce1c0 libdyld.dylib`dyld_stub_binder

// read __cfstring section
(lldb) read_mem_as_addr 0x102ee02e0 0x102ee0560
0x102ee02e0: 0x00000001b40b2610 (void *)0x00000001b40b25c0: __NSCFConstantString
0x102ee02e8: 0x00000000000007c8
0x102ee02f0: 0x0000000102ede156 "%s"
0x102ee02f8: 0x0000000000000002
...
0x102ee0540: 0x00000001b40b2610 (void *)0x00000001b40b25c0: __NSCFConstantString
0x102ee0548: 0x00000000000007c8
0x102ee0550: 0x0000000102ede2cc "Default Configuration"
0x102ee0558: 0x0000000000000015

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read_cstring - read memory as c style string

(lldb) seg
...
	[0x10077b3ae-0x10077b424)	0x76          __objc_classname
....
	[0x100782898-0x1007857f0)	0x2f58        String Table
...

// read __TEXT.__objc_classname
(lldb) read_cstring 0x10077b3ae 0x10077b424
0x10077b3ae: "ViewController"
...
0x10077b414: "UISceneDelegate"
9 locations found

// read String Table
(lldb) read_cstring 0x100782898 0x1007857f0
0x100782898: " "
0x10078289a: "_JITDemoVersionNumber"
...
0x1007857c8: "__OBJC_PROTOCOL_$_UIWindowSceneDelegate"
338 locations found

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symbolize:

load_dSYM

Add debug symbol file(s) to corresponding module(s)

(lldb) load_dSYM /path/to/dSYMs/Alamofire.framework.dSYM
1 dSYM file(s) loaded

or

(lldb) load_dSYM /path/to/dSYMs
16 dSYM file(s) loaded

symbolize

Symbolize address, uncaught exception address list or crash report file.

Symbolize address

(lldb) dis -c 1 -a 0x1045843d4
JITDemo`___lldb_unnamed_symbol302:
    0x1045843d4 <+0>: sub    sp, sp, #0x1f0
(lldb) symbolize 0x1045843d4
0x1045843d4: JITDemo`-[ViewController ls_dir:] + 0

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Symbolize uncaught exception address list

(lldb) symbolic (0x1845aed8c 0x1837685ec 0x18450a448 0x104360f78 0x18e4fd83c 0x18e3a3760 0x18e39d7c8 0x18e392890 0x18e3911d0 0x18eb72d1c 0x18eb752c8 0x18eb6e368 0x184557404 0x184556c2c 0x18455479c 0x184474da8 0x186459020 0x18e491758 0x104361da0 0x183f05fc0)
backtrace: 
frame #0: 0x1845aed8c CoreFoundation`__exceptionPreprocess + 228
frame #1: 0x1837685ec libobjc.A.dylib`objc_exception_throw + 56
frame #2: 0x18450a448 CoreFoundation`-[__NSArray0 objectEnumerator] + 0
frame #3: 0x104360f78 JITDemo`-[ViewController touchesBegan:withEvent:] + at ViewController.m:51:5
...

or

(lldb) symbolic 0x1845aed8c 0x1837685ec 0x18450a448 0x104360f78 0x18e4fd83c 0x18e3a3760 0x18e39d7c8 0x18e392890 0x18e3911d0 0x18eb72d1c 0x18eb752c8 0x18eb6e368 0x184557404 0x184556c2c 0x18455479c 0x184474da8 0x186459020 0x18e491758 0x104361da0 0x183f05fc0
backtrace: 
frame #0: 0x1845aed8c CoreFoundation`__exceptionPreprocess + 228
frame #1: 0x1837685ec libobjc.A.dylib`objc_exception_throw + 56
frame #2: 0x18450a448 CoreFoundation`-[__NSArray0 objectEnumerator] + 0
frame #3: 0x104360f78 JITDemo`-[ViewController touchesBegan:withEvent:] + at ViewController.m:51:5
...

Symbolize crash report file.

(lldb) symbolize /Users/xxx/test/JITDemo-2024-07-29-163051.ips

or

(lldb) symbolize /Users/xxx/Desktop/JITDemo.crash

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DebugKit

Debugkit is a framework for debugging, it is not loaded by default.

You can load it using the debugkit command.

(lldb) debugkit
loading DebugKit, this may take a while
[INFO] GCDWebUploader started on port 80 and reachable at http://xxx.xxx.xxx.xxx/
DebugKit loaded

UIControl extension

(lldb) po btn
<UIButton: 0x107d2eaf0; frame = (100 100; 200 30); opaque = NO; layer = <CALayer: 0x282f4ee20>>
    control events list:
        target: <ViewController: 0x107e2ac90>, action: -[ViewController clicked:], event: UIControlEventTouchUpInside

NSObject extension

UIKit provides debugging methods in NSObject(IvarDescription)，It works on iOS but not on macOS.Debugkit provides several alternative solutions for this.

Here's one solution in DebugKit:

(lldb) divars self
(FP)
in ViewController:
    _test (unsigned long): {length = 8, bytes = 0x5a00ab0000000000}

(lldb) dmethods self
<ViewController: 0x1063c7c10>: (FP)
in ViewController:
    Class Methods:
        + (void) ivar_description:(id)arg1; (0x1063c4d10)
        + (void) method_description:(id)arg1; (0x1063c4870)
    Properties:
        @property unsigned long test;  (@synthesize test = _test;)
    Instance Methods:
        - (void) setRepresentedObject:(id)arg1; (0x1063c4800)
        - (void) setTest:(unsigned long)arg1; (0x1063c5120)
        - (unsigned long) test; (0x1063c5100)
        - (void) viewDidLoad; (0x1063c4790)
(NSViewController ...)

Here's another solution in DebugKit (Powered by pookjw/IvarDescription):

(lldb) divars ofile
<CDMachOFile: 0x600002580000>: (DK)
in CDMachOFile:
    <+ 32> _byteOrder (unsigned long): 0
...
    <+ 24> _searchPathState (CDSearchPathState*): nil
in NSObject:
    <+  0> isa (Class): CDMachOFile(isa, 0x23d8001000711c5)

(lldb) dmethods ofile
<CDMachOFile: 0x1000711c0>: (DK)
in CDMachOFile:
    Properties:
        @property (readonly) unsigned long byteOrder;
...
        @property (readonly, nonatomic) Class processorClass;
    Instance Methods:
        - (int) cputype; (0x10002b310)
...
        - (id) segmentWithName:(id)arg1; (0x100028f00)
(CDFile ...)

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NSBlock extension

block code sample

^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
    NSLog(@"%@ %d", self, fd);
}

Here is the official block description.

(lldb) po $x0
<__NSMallocBlock__: 0x282090ab0>
 signature: "v24@?0@"NSURLSessionDataTask"8@"NSError"16"
 invoke   : 0x102fe4a4c (/private/var/containers/Bundle/Application/3AF6DA13-4E66-4E8F-89D0-BDD268A430A7/JITDemo.app/JITDemo.debug.dylib`__41-[ViewController touchesBegan:withEvent:]_block_invoke_2)
 copy     : 0x102fe4bc8 (/private/var/containers/Bundle/Application/3AF6DA13-4E66-4E8F-89D0-BDD268A430A7/JITDemo.app/JITDemo.debug.dylib`__copy_helper_block_e8_32s)
 dispose  : 0x102fe4c00 (/private/var/containers/Bundle/Application/3AF6DA13-4E66-4E8F-89D0-BDD268A430A7/JITDemo.app/JITDemo.debug.dylib`__destroy_helper_block_e8_32s)

Here is DebugKit's block description, it's clearer and more straightforward.

(lldb) po [$x0 description]
<__NSMallocBlock__: 0x282090ab0>
    - size: 44
    - func_addr: <0x102fe4a4c>
    - func_prototype: void (*)(id(block) , NSURLSessionDataTask * , NSError * )
    - variable or captured variable:
        - <ViewController: 0x107e2ac90>
        - int 20

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iOS Sandbox Explorer

Powered by GCDWebServer.The server starts along with DebugKit, and once it's running, you can access sandbox files via a web browser.

[INFO] GCDWebUploader started on port 80 and reachable at http://xxx.xxx.xxx.xxx/
(lldb) c
Process 4569 resuming
[INFO] GCDWebUploader now locally reachable at http://iPhone-8.local/

vmmap

show vm map info of address

(lldb) po self
<ViewController: 0x105329a40>

(lldb) vmmap self
pid: 4713
path: /private/var/containers/Bundle/Application/08326E5F-4DEB-41CC-8320-4417B1649E7F/JITDemo.app/JITDemo
 
0000000105300000-0000000105400000 [   1.0M] rw-/rwx SM=PRIVATE <MALLOC_TINY>
    (offset 0) /usr/share/icu/icudt70l.dat

show vm map info of current process

(lldb) vmmap
pid: 4713
path: /private/var/containers/Bundle/Application/08326E5F-4DEB-41CC-8320-4417B1649E7F/JITDemo.app/JITDemo
 
DYLD all image info: 0000000104cd0000 + 170 format = 1
0000000104c00000-0000000104c04000 [    16K] r-x/r-x SM=COW
    104c00000-104c0c000: __TEXT r-x (/private/var/containers/Bundle/Application/08326E5F-4DEB-41CC-8320-4417B1649E7F/JITDemo.app/JITDemo) slide=4c00000
    (offset 0) /private/var/containers/Bundle/Application/08326E5F-4DEB-41CC-8320-4417B1649E7F/JITDemo.app/JITDemo
0000000104c04000-0000000104c08000 [    16K] r-x/rwx SM=PRIVATE
    104c00000-104c0c000: __TEXT r-x (/private/var/containers/Bundle/Application/08326E5F-4DEB-41CC-8320-4417B1649E7F/JITDemo.app/JITDemo) slide=4c00000
    (offset 0) /private/var/containers/Bundle/Application/08326E5F-4DEB-41CC-8320-4417B1649E7F/JITDemo.app/JITDemo
...
    221e4c000-235b08000: __LINKEDIT r-- (/System/Library/PrivateFrameworks/AppSSOCore.framework/AppSSOCore) slide=c204000
    221e4c000-235b08000: __LINKEDIT r-- (/System/Library/Frameworks/Accelerate.framework/Frameworks/vImage.framework/Libraries/libCGInterfaces.dylib) slide=c204000
0000000280000000-00000002a0000000 [ 512.0M] rw-/rwx SM=PRIVATE <MALLOC_NANO>
0000000fc0000000-0000001000000000 [   1.0G] ---/--- SM=EMPTY
0000001000000000-0000007000000000 [ 384.0G] ---/--- SM=EMPTY

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Others:

find_el - find endless loop

Detects endless loop in all threads at this point.

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    int a = 1;
    NSLog(@"%s", __PRETTY_FUNCTION__);
    while (a) {
        a++;
    }
}

# touch device screen
2023-05-20 12:29:52.604910+0800 Interlock[56660:1841567] -[ViewController touchesBegan:withEvent:]
# pause program execution, then execute find_el in lldb
(lldb) find_el
Breakpoint 1: where = Interlock`-[ViewController touchesBegan:withEvent:] + 136 at ViewController.mm:34:5, address = 0x109dd8d48
Breakpoint 2: where = Interlock`main + 110 at main.m:17:5, address = 0x109dd911e
delete breakpoint 2
call Interlock`-[ViewController touchesBegan:withEvent:] + 136 at ViewController.m:34:5, 22 times per second, hit_count: 100
...

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thread_eb - extended backtrace of thread

Get extended backtrace of thread.

(lldb) bt
* thread #2, queue = 'com.apple.root.default-qos', stop reason = breakpoint 6.1
  * frame #0: 0x0000000104ab58f8 Concurrency`__41-[ViewController touchesBegan:withEvent:]_block_invoke(.block_descriptor=0x0000000104ab80f8) at ViewController.m:29:13
    frame #1: 0x0000000104df51dc libdispatch.dylib`_dispatch_call_block_and_release + 24
    frame #2: 0x0000000104df519c libdispatch.dylib`_dispatch_client_callout + 16
    frame #3: 0x0000000104e01200 libdispatch.dylib`_dispatch_queue_override_invoke + 968
    frame #4: 0x0000000104e067c8 libdispatch.dylib`_dispatch_root_queue_drain + 604
    frame #5: 0x0000000104e06500 libdispatch.dylib`_dispatch_worker_thread3 + 136
    frame #6: 0x0000000181fc3fac libsystem_pthread.dylib`_pthread_wqthread + 1176
    frame #7: 0x0000000181fc3b08 libsystem_pthread.dylib`start_wqthread + 4

(lldb) thread_eb
thread #4294967295: tid = 0x190c, 0x0000000104e907cc libdispatch.dylib`_dispatch_root_queue_push_override + 160, queue = 'com.apple.main-thread'
    frame #0: 0x0000000104e907cc libdispatch.dylib`_dispatch_root_queue_push_override + 160
    frame #1: 0x0000000104ded884 Concurrency`-[ViewController touchesBegan:withEvent:](self=<unavailable>, _cmd=<unavailable>, touches=<unavailable>, event=<unavailable>) at ViewController.m:25:5
    frame #2: 0x000000018bb1583c UIKit`forwardTouchMethod + 340
    frame #3: 0x000000018b9bb760 UIKit`-[UIResponder touchesBegan:withEvent:] + 60
...

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Credits

https://github.com/DerekSelander/LLDB

https://github.com/facebook/chisel

https://github.com/aaronst/macholibre

https://github.com/swisspol/GCDWebServer

https://github.com/pookjw/IvarDescription

https://github.com/yulingtianxia/BlockHook (block with private data)

https://github.com/comex/myvmmap

License

YJLLDB is released under the Apache License 2.0. See LICENSE file for details.

Name		Name	Last commit message	Last commit date
Latest commit History 68 Commits
Frameworks		Frameworks
autoGenerated		autoGenerated
src		src
.gitignore		.gitignore
LICENSE		LICENSE
README.md		README.md

License

geekonion/YJLLDB

Folders and files

Latest commit

History

Repository files navigation

YJLLDB

Commands list

Installation

Usage

Breakpoint:

bab - break at bytes

baf - break all functions in module

bdc - breakpoint disable current

bda - breakpoint disable at class

bdr - breakpoint disable in range

bblocks - break blocks (arm64 only)

binitfunc - break init func

bmethod - break method

bmain - break main function

Search:

slookup - lookup string

blookup - lookup bytes

fblock - find block (arm64 only)

blocks - find blocks (arm64 only)

ffunc - find function

overridden_method

Trace:

mtrace - trace module

rtrace

notifier

Patch:

patch (private)

Dump:

dmodule - dump module (private)

dapp - dump App (private)

Shell command

addcmd

delcmd

pwd

cd

ls

File:

commads to get common directory

ils

dfile - download file

ddir - download directory

ufile - upload local file to device

irm - remove file

Module:

image_list

info_plist - print Info.plist

executable - print main executable name

appdelegate

mname - module name

segments - print segments

main

initfunc - print init func

func_starts - function starts

got - print __got section

lazy_sym - print __la_symbol_ptr section

entitlements - dump entitlements

Objc

classes - print class names

dmethods

divars

duplicate_class

Assembly

inst2bytes

bytes2inst

Memory:

read_mem_as_addr

read_cstring - read memory as c style string

symbolize:

load_dSYM

symbolize

DebugKit

UIControl extension

NSObject extension

NSBlock extension

got - print `__got` section

lazy_sym - print `__la_symbol_ptr` section

Packages