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Strange behavior of processes after kauth listener activated
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Strange behavior of processes after kauth listener activated

  • Subject: Strange behavior of processes after kauth listener activated
  • From: Misha Pak <email@hidden>
  • Date: Wed, 02 Oct 2013 18:33:47 +0300
Gurus,
   I implemented a kauth FileScope listener to monitor some file activity and report to a user mode daemon some stuff. 
The way I did it was to catch the file event (either KAUTH_FILEOP_OPEN or KAUTH_FILEOP_CLOSE, doesn't matter), check whether this operation is on file/folder I need to monitor and if yes, send some data to the usermode daemon using ctl_enqueuedata()...
Well, if I do that, *any* process that accesses this file or folder, gets stuck in _exit() for no apparent  reason (before exitting, all processes read and write data to the monitored file seamlessly).
The data I sent via the call, gets through to the daemon correctly and the daemon itself is not stuck at all. 
If I comment out the ctl_enqueue() call, everything works fine. 

Does any one have an idea what might be the problem here? It doesn't help wrapping the ctl_enqueue() with locks... Same thing. 

Thanks a lot
Misha
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