iOS - Xcode Error: cannot attach to process due to System Integrity Protection

Question

When I running an application shared extension from XCode run button and then trying to share files, XCode shows the below error frequently. Anyone have any idea whats causing it?

Error: "cannot attach to process due to System Integrity Protection"

Answer 1

System Integrity Protection(SIP) aka rootless is a new security feature in OS X 10.11. By default it disables even the administrator to access/modify the root. Follow these steps to disable SIP:

1. Restart your Mac.

2. Before OS X starts up, hold down Command-R and keep it held down until you see an Apple icon and a progress bar. Release. This boots you into Recovery.

3. From the Utilities menu, select Terminal.

4. At the prompt type exactly the following and then press Return:

    csrutil disable
   

5. Terminal should display a message that SIP was disabled.

6. From the  menu, select Restart.

You can re-enable SIP by following the above steps, but using csrutil enable instead.

Answer 2

In some cases, if you are trying to connect to a "system provided" executable (for example, Terminal.app) there is a workaround by making a copy of such executable. The copy will be checked by SIP as "user installed" instead of "system provided".

For an example, see "Launching the Terminal app from Xcode on OS X with System Integrity Protection"