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SubjectRe: [5.2 REGRESSION] Generic vDSO breaks seccomp-enabled userspace on i386
On Tue, Jul 23, 2019 at 07:04:46AM -0700, Andy Lutomirski wrote:
>
>
> > On Jul 23, 2019, at 2:18 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> >
> >> On Mon, Jul 22, 2019 at 04:47:36PM -0700, Andy Lutomirski wrote:
> >>
> >> I don't love this whole concept, but I also don't have a better idea.
> >
> > Are we really talking about changing the kernel because BPF is expecting
> > things? That is, did we just elevate everything BPF can observe to ABI?
> >
>
> No, this isn’t about internals in the kernel mode sense.

*phew*, I was scared for a wee moment.

> It’s about the smallish number of cases where the kernel causes user
> code to do a specific syscall and the user has a policy that doesn’t
> allow that syscall. This is visible to user code via seccomp and
> ptrace.
>
> Yes, it’s obnoxious. Do you have any suggestions?

Not really; I think I just demonstrated I don't fully understand the
problem space here :/

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