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Can't get Mach-O text segment size in iOS executable

iPhone executable (MACH-O) decryptionHow to get the size of symbols in the symbol table of Mach-O file?thread 1: signal SIGABRT error app crashesTrying to send mail and app crashedSelected cell not persisting in UICollectionView. Cannot save. *** Terminating app due to uncaught exceptionreact-native FBSDK LoginManager not workingFat Mach-O Executable Multi-purpose?Objective-c deallocated when opening a new form?Smallest size of valid executable Mach-o fileHow to inspect a MacOS executable file (Mach-O)?

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3

I'm trying to get .text segment size of Mach-O executable of my iOS app.

size_t size_of_image(struct mach_header *header) 
size_t sz = sizeof(*header); // Size of the header
sz += header->sizeofcmds; // Size of the load commands

struct load_command *lc = (struct load_command *) (header + 1);
for (uint32_t i = 0; i < header->ncmds; i++) 
 if (lc->cmd == LC_SEGMENT_64) 
 sz += ((struct segment_command *) lc)->vmsize; // Size of segments
 
 lc = (struct load_command *) ((char *) lc + lc->cmdsize);

return sz;

and i call this function from main

int main(int argc, char * argv[]) dlinfo.dli_fbase == NULL)
 return 0; // Can't find symbol for main
//
header = dlinfo.dli_fbase; // Pointer on the Mach-O header
size_of_image(header);
@autoreleasepool 
 return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
 

Problem is lc->cmd is always 0, and i never get LC_SEGMENT_64 command.

I've tried LC_SEGMENT - same result

Running iOS 12 on iPhone 6.
I need to get the .text segment of the executable for reverse - engineering protection functions.

It seems my ** mach_header *header** is wrongly field by dladdr function.

Any ideas what is wrong?

ios executable reverse-engineering segment mach-o

share|improve this question

asked Mar 28 at 14:51

AndrewAndrew

32333 silver badges1515 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hello Andrew, did you manage to solve this? I am having the same issue.
  
  – Agustin Pazos
  Jul 12 at 14:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  see answer below. it worked for me @AgustinPazos
  
  – Andrew
  Jul 17 at 10:56
  

  
  
  
  

add a comment
 | 

3

I'm trying to get .text segment size of Mach-O executable of my iOS app.

size_t size_of_image(struct mach_header *header) 
size_t sz = sizeof(*header); // Size of the header
sz += header->sizeofcmds; // Size of the load commands

struct load_command *lc = (struct load_command *) (header + 1);
for (uint32_t i = 0; i < header->ncmds; i++) 
 if (lc->cmd == LC_SEGMENT_64) 
 sz += ((struct segment_command *) lc)->vmsize; // Size of segments
 
 lc = (struct load_command *) ((char *) lc + lc->cmdsize);

return sz;

and i call this function from main

int main(int argc, char * argv[]) dlinfo.dli_fbase == NULL)
 return 0; // Can't find symbol for main
//
header = dlinfo.dli_fbase; // Pointer on the Mach-O header
size_of_image(header);
@autoreleasepool 
 return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
 

Problem is lc->cmd is always 0, and i never get LC_SEGMENT_64 command.

I've tried LC_SEGMENT - same result

Running iOS 12 on iPhone 6.
I need to get the .text segment of the executable for reverse - engineering protection functions.

It seems my ** mach_header *header** is wrongly field by dladdr function.

Any ideas what is wrong?

ios executable reverse-engineering segment mach-o

share|improve this question

asked Mar 28 at 14:51

AndrewAndrew

32333 silver badges1515 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hello Andrew, did you manage to solve this? I am having the same issue.
  
  – Agustin Pazos
  Jul 12 at 14:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  see answer below. it worked for me @AgustinPazos
  
  – Andrew
  Jul 17 at 10:56
  

  
  
  
  

add a comment
 | 

I'm trying to get .text segment size of Mach-O executable of my iOS app.

size_t size_of_image(struct mach_header *header) 
size_t sz = sizeof(*header); // Size of the header
sz += header->sizeofcmds; // Size of the load commands

struct load_command *lc = (struct load_command *) (header + 1);
for (uint32_t i = 0; i < header->ncmds; i++) 
 if (lc->cmd == LC_SEGMENT_64) 
 sz += ((struct segment_command *) lc)->vmsize; // Size of segments
 
 lc = (struct load_command *) ((char *) lc + lc->cmdsize);

return sz;

and i call this function from main

int main(int argc, char * argv[]) dlinfo.dli_fbase == NULL)
 return 0; // Can't find symbol for main
//
header = dlinfo.dli_fbase; // Pointer on the Mach-O header
size_of_image(header);
@autoreleasepool 
 return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
 

Problem is lc->cmd is always 0, and i never get LC_SEGMENT_64 command.

I've tried LC_SEGMENT - same result

Running iOS 12 on iPhone 6.
I need to get the .text segment of the executable for reverse - engineering protection functions.

It seems my ** mach_header *header** is wrongly field by dladdr function.

Any ideas what is wrong?

ios executable reverse-engineering segment mach-o

share|improve this question

asked Mar 28 at 14:51

AndrewAndrew

32333 silver badges1515 bronze badges

size_t size_of_image(struct mach_header *header) 
size_t sz = sizeof(*header); // Size of the header
sz += header->sizeofcmds; // Size of the load commands

struct load_command *lc = (struct load_command *) (header + 1);
for (uint32_t i = 0; i < header->ncmds; i++) 
 if (lc->cmd == LC_SEGMENT_64) 
 sz += ((struct segment_command *) lc)->vmsize; // Size of segments
 
 lc = (struct load_command *) ((char *) lc + lc->cmdsize);

return sz;

int main(int argc, char * argv[]) dlinfo.dli_fbase == NULL)
 return 0; // Can't find symbol for main
//
header = dlinfo.dli_fbase; // Pointer on the Mach-O header
size_of_image(header);
@autoreleasepool 
 return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
 

share|improve this question

asked Mar 28 at 14:51

AndrewAndrew

32333 silver badges1515 bronze badges

share|improve this question

asked Mar 28 at 14:51

AndrewAndrew

32333 silver badges1515 bronze badges

asked Mar 28 at 14:51

AndrewAndrew

32333 silver badges1515 bronze badges

asked Mar 28 at 14:51

AndrewAndrew

32333 silver badges1515 bronze badges

1 Answer
1

active

oldest

votes

2

The culprit is in struct mach_header *header.

Replace it with struct mach_header_64 *header instead.

Keep using LC_SEGMENT_64 for modern binaries.

share|improve this answer

answered Mar 28 at 15:38

Kamil.SKamil.S

2,49022 gold badges1212 silver badges2626 bronze badges

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 | 

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2

The culprit is in struct mach_header *header.

Replace it with struct mach_header_64 *header instead.

Keep using LC_SEGMENT_64 for modern binaries.

share|improve this answer

answered Mar 28 at 15:38

Kamil.SKamil.S

2,49022 gold badges1212 silver badges2626 bronze badges

add a comment
 | 

2

The culprit is in struct mach_header *header.

Replace it with struct mach_header_64 *header instead.

Keep using LC_SEGMENT_64 for modern binaries.

share|improve this answer

answered Mar 28 at 15:38

Kamil.SKamil.S

2,49022 gold badges1212 silver badges2626 bronze badges

add a comment
 | 

The culprit is in struct mach_header *header.

Replace it with struct mach_header_64 *header instead.

Keep using LC_SEGMENT_64 for modern binaries.

share|improve this answer

answered Mar 28 at 15:38

Kamil.SKamil.S

2,49022 gold badges1212 silver badges2626 bronze badges

share|improve this answer

answered Mar 28 at 15:38

Kamil.SKamil.S

2,49022 gold badges1212 silver badges2626 bronze badges

answered Mar 28 at 15:38

Kamil.SKamil.S

2,49022 gold badges1212 silver badges2626 bronze badges

answered Mar 28 at 15:38

Kamil.SKamil.S

2,49022 gold badges1212 silver badges2626 bronze badges