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Re: [PATCH 4/6] seccomp: add a way to access filters via bpf fds

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On Fri, Sep 04, 2015 at 01:26:42PM -0700, Kees Cook wrote:
> On Fri, Sep 4, 2015 at 9:04 AM, Tycho Andersen
> <tycho.andersen@canonical.com> wrote:
> > This patch adds a way for a process that is "real root" to access the
> > seccomp filters of another process. The process first does a
> > PTRACE_SECCOMP_GET_FILTER_FD to get an fd with that process' seccomp filter
> > attached, and then iterates on this with PTRACE_SECCOMP_NEXT_FILTER using
> > bpf(BPF_PROG_DUMP) to dump the actual program at each step.
> 
> Why is this a new ptrace interface instead of a new seccomp interface?
> I would expect this to only be valid for "current", otherwise we could
> run into races as the ptracee adds filters. i.e. it is not safe to
> examine seccomp filters from tasks other than current.

same question.
I thought we discussed to add a command to seccomp() syscall for that?

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c/r of seccomp filters via underlying eBPF Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 18:10 +0200
  [PATCH 5/6] seccomp: add a way to attach a filter via eBPF fd Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 18:10 +0200
    Re: [PATCH 5/6] seccomp: add a way to attach a filter via eBPF fd Kees Cook <keescook@chromium.org> - 2015-09-04 22:50 +0200
      Re: [PATCH 5/6] seccomp: add a way to attach a filter via eBPF fd "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2015-09-05 09:20 +0200
    Re: [PATCH 5/6] seccomp: add a way to attach a filter via eBPF fd Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-09-04 22:50 +0200
  [PATCH 4/6] seccomp: add a way to access filters via bpf fds Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 18:10 +0200
    Re: [PATCH 4/6] seccomp: add a way to access filters via bpf fds Kees Cook <keescook@chromium.org> - 2015-09-04 22:30 +0200
      Re: [PATCH 4/6] seccomp: add a way to access filters via bpf fds Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-09-04 22:40 +0200
        Re: [PATCH 4/6] seccomp: add a way to access filters via bpf fds Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 23:00 +0200
  [PATCH 6/6] ebpf: allow BPF_REG_X in src_reg conditional jumps Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 18:10 +0200
    Re: [PATCH 6/6] ebpf: allow BPF_REG_X in src_reg conditional jumps Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-09-04 23:10 +0200
      Re: [PATCH 6/6] ebpf: allow BPF_REG_X in src_reg conditional jumps Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-05 00:50 +0200
        Re: [PATCH 6/6] ebpf: allow BPF_REG_X in src_reg conditional jumps Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-09-05 06:20 +0200
  [PATCH 1/6] ebpf: add a seccomp program type Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 18:10 +0200
    Re: [PATCH 1/6] ebpf: add a seccomp program type Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-09-04 22:20 +0200
      Re: [PATCH 1/6] ebpf: add a seccomp program type Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 23:10 +0200
    Re: [PATCH 1/6] ebpf: add a seccomp program type Kees Cook <keescook@chromium.org> - 2015-09-04 22:40 +0200
      Re: [PATCH 1/6] ebpf: add a seccomp program type Kees Cook <keescook@chromium.org> - 2015-09-04 23:10 +0200
      Re: [PATCH 1/6] ebpf: add a seccomp program type Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 23:10 +0200
    Re: [PATCH 1/6] ebpf: add a seccomp program type Andy Lutomirski <luto@amacapital.net> - 2015-09-05 00:00 +0200
  [PATCH 3/6] ebpf: add a way to dump an eBPF program Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 18:10 +0200
    Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Kees Cook <keescook@chromium.org> - 2015-09-04 22:20 +0200
      Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 22:50 +0200
        Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-09-04 23:00 +0200
          Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 23:10 +0200
        Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Kees Cook <keescook@chromium.org> - 2015-09-04 23:00 +0200
        Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Andy Lutomirski <luto@amacapital.net> - 2015-09-04 23:50 +0200
          Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-05 00:30 +0200
            Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Andy Lutomirski <luto@amacapital.net> - 2015-09-05 01:10 +0200
              Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-05 02:30 +0200
            Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Kees Cook <keescook@chromium.org> - 2015-09-05 01:30 +0200
              Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Andy Lutomirski <luto@amacapital.net> - 2015-09-05 02:10 +0200
    Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-09-04 22:30 +0200
      Re: [PATCH 3/6] ebpf: add a way to dump an eBPF program Tycho Andersen <tycho.andersen@canonical.com> - 2015-09-04 22:50 +0200

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