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SubjectRe: [PATCH v6 3/5] seccomp: add a way to get a listener fd from ptrace
Tycho, Sorry for the duplicate, I forgot to CC the list :(

On Wed, Oct 17, 2018 at 3:00 PM Tycho Andersen <> wrote:
> That's one of the use cases, but there are a large number of others. I
> discuss a few in patch 1:

Thanks this is making more sense to me now.

I haven't been keeping up with the list and just did a bunch
of reading. It seems that stackable LSM's are making some real
progress now, and I wonder if those patches are merged would
using a stacked security module approach be worth exploring if
it provides the same or greater flexibility, and assuming all
syscalls of interest can be hooked somehow?

>FWIW, I'm dropping the ptrace bits (and the fd passing bits)
>from the next version, because they seem fairly controversial.

Yeah ptrace can be difficult to work with, no doubt it is
controversial; <3 Yama. I've used the ptrace method for counting
syscall failures, and ignoring the non-trivial amount of time it
took me to learn the API then write working code, the performance
loss (in a syscall heavyweight program like web browser) is a
noticeable problem, outside of a debugging or analysis context.

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