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SubjectRe: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering

* Linus Torvalds <> wrote:

> And per-system-call permissions are very dubious. What system calls
> don't you want to succeed? That ioctl? You just made it impossible
> to do a modern graphical application. Yet the kind of thing where
> we would _want_ to help users is in making it easier to sandbox
> something like the adobe flash player. But without accelerated
> direct rendering, that's not going to fly, is it?

I was under the impression that Will had a very specific application
in mind which actually works today and uses the inferior version of

Will, mind filling us in on that?

I'd agree that adding any of this without a real serious app making
real use of it would be pointless. I discussed this under the
impression that the app existed :-)

I also got the very distinct impression from the various iterations
that a real usecase existed behind it - all the fixes and
considerations looked very realistic, not designed up for security's

> So I'm sorry for throwing cold water on you guys, but the whole
> "let's come up with a new security gadget" thing just makes me go
> "oh no, not again".

Fair enough :-)



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