System Integrity Protection from Apple protects very important parts of the system and is, in my opinion, the main reason a Mac is so secure.
That's why I ask myself the question whenever I boot Linux or Windows, for example, on a different volume. Can Windows, for example, then change something in the area of e.g. / system or does the system integrity protection also protect there?
The same question also with disk mode. Is the Mac protected by the SIP if it is used as a hard drive by another Mac?
Best Answer
No, System Integrity Protection is not active when you are running other operating systems or when you mount the hard drive in another computer.
There are other protection mechanisms (such as Secure Boot and T2 disk encryption) on modern Macs that protect your system from booting "malicious" (i.e. infected) operating systems, and from the disk being simply mounted on a different computer.