Well you have to admit, that an OS with a "protected root filesystem", will be safer than any Windows solution.
Doubtful. I don't think that if your car gets an OS, the OS will have actual users. There will be just one user - and since that user will need super user permissions to access the various device files, I give you one guess which user that will be.

In reply to Re^4: How Software Engineers Are Different Than Auto Mechanics by Anonymous Monk
in thread How Software Engineers Are Different Than Auto Mechanics by hossman

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