mach_inject crashes target in OSX 10.12 (Sierra), unless if launched through Xcode

[loco41211]

Is this working for everyone else in 10.12/Sierra?

I have an odd situation where mach_inject works perfectly fine, when my app is launched through Xcode. If I launch my app directly, the target process crashes as soon as it attempts to inject:

Date/Time:             2016-09-21 22:55:58.682 +0100
OS Version:            Mac OS X 10.12 (16A323)
Report Version:        12
Anonymous UUID:        8AD07C6C-3EFE-5D39-B58B-393D95473947


Time Awake Since Boot: 3400 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x00000000e50d34ab
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [0]

External Modification Warnings:
Thread creation by external task.

VM Regions Near 0xe50d34ab:
    Stack                  00000000bf800000-00000000c0000000 [ 8192K] rw-/rwx SM=PRV  
--> 
    Submap                 00000000ffff0000-00000000ffff1000 [    4K] r--/r-- SM=PRV  process-only VM submap

Does anyone have any ideas on how to tackle this?

[rodionovd]

Please don't file a bug report stating mach_inject is crashing for you when you try to use it -- you have to be hard-core enough to debug the problem yourself.

But anyway, it would be nice if you provide a simple demo project to reproduce the crash. Thanks

[smic]

I get the same crash since Sierra. I'm using mach_inject in my application www.interface-inspector.com Interesting is the message "Thread creation by external task.". I don't get crashes anymore after I disabled SIP.

[doshisahil]

did you try codesigning your application and bundle which is getting injected?