Re: General flags to turn things off (getrandom, pid lookup, etc)

From: Theodore Ts'o
Date: Sun Jul 27 2014 - 17:06:46 EST

On Fri, Jul 25, 2014 at 11:30:48AM -0700, Andy Lutomirski wrote:
> There is recent interest in having a way to turn generally-available
> kernel features off. Maybe we should add a good one so we can stop
> bikeshedding and avoid proliferating dumb interfaces.

I believe the seccomp infrastructure (which is already upstream)
should be able to do most of what you want, at least with respect to
features which are exposed via system calls (which was most of your

It won't cover x86 specific things like restricting RDTSC or CPUID
(and as far as I know you can't intercept the CPUID instruction), but
I'm not sure it matters. I don't really see the point, myself.

- Ted
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