Is anyone else seeing that the /mach_kernel is unhidden after the Security Update 2015-002 on Mavericks?
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Yes, Rich Trouton has it documented
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@bentoms has also developed a solution for this problem:
Security Update 2015-002 & mach_kernel file visibility
Good catch, I happened to see it but didn't fully recognize it till now. Being in a school environment, it could be a potential headache.