Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters

From	Oleg Nesterov <oleg@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters
Date	2015-10-25 15:50 +0100
Message-ID	<qnuMq-4bC-17@gated-at.bofh.it> (permalink)
References	(3 earlier) <qlNgw-8sZ-39@gated-at.bofh.it> <qm6Ma-3fF-13@gated-at.bofh.it> <qm75w-3ST-21@gated-at.bofh.it> <qm8XF-6Ci-27@gated-at.bofh.it> <qm9h0-6Z6-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 10/21, Tycho Andersen wrote:
>
> > And this leads to another question... If we expect that this interface
> > can change later, then perhaps PTRACE_SECCOMP_GET_FILTER should also
> > dump some header before copy_to_user(fprog->filter) ? Say, just
> > "unsigned long version" == 0 for now. So that we can avoid
> > PTRACE_SECCOMP_GET_FILTER_V2 in future.
>
> So this is interesting. Like Kees mentioned, the bulk of the work
> would be done by the bpf syscall. We'd still need some way to get
> access to the fd itself, which we could (ab)use
> PTRACE_SECCOMP_GET_FILTER for, by returning the fd + BPF_MAXINSNS (so
> that it doesn't conflict with length) or something like that. Or add a
> _V2 as you say. If there is some change we can make to have a nicer
> interface than fd + BPF_MAXINSNS to future proof, I'm fine with making
> it.

Can't comment, this is up to you/Kees ;)

So, just in case, let me repeat I am fine with this patch.

Oleg.

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Thread

v8 of seccomp filter c/r Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-20 22:00 +0200
  [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-20 22:00 +0200
    Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Kees Cook <keescook@chromium.org> - 2015-10-20 22:30 +0200
      Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-20 22:40 +0200
    Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Oleg Nesterov <oleg@redhat.com> - 2015-10-20 22:30 +0200
      Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-21 00:10 +0200
        Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Oleg Nesterov <oleg@redhat.com> - 2015-10-21 21:00 +0200
          Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-21 21:20 +0200
            Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Kees Cook <keescook@chromium.org> - 2015-10-21 22:20 +0200
              Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Daniel Borkmann <daniel@iogearbox.net> - 2015-10-21 22:20 +0200
                Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-21 22:40 +0200
            Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Oleg Nesterov <oleg@redhat.com> - 2015-10-21 23:20 +0200
              Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Kees Cook <keescook@chromium.org> - 2015-10-21 23:30 +0200
              Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-21 23:40 +0200
                Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Oleg Nesterov <oleg@redhat.com> - 2015-10-25 15:50 +0100
                Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Kees Cook <keescook@chromium.org> - 2015-10-26 07:50 +0100
                Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Kees Cook <keescook@chromium.org> - 2015-10-26 08:10 +0100
                Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp  filters Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-27 01:10 +0100
                Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters Daniel Borkmann <daniel@iogearbox.net> - 2015-10-27 01:20 +0100

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