Re: v5 of seccomp filter c/r patches

From	Tycho Andersen <tycho.andersen@canonical.com>
Newsgroups	linux.kernel
Subject	Re: v5 of seccomp filter c/r patches
Date	2015-10-03 01:00 +0200
Message-ID	<qfht1-oF-33@gated-at.bofh.it> (permalink)
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On Sat, Oct 03, 2015 at 12:57:49AM +0200, Daniel Borkmann wrote:
> On 10/03/2015 12:44 AM, Tycho Andersen wrote:
> >On Fri, Oct 02, 2015 at 02:10:24PM -0700, Kees Cook wrote:
> ...
> >Ok, how about,
> >
> >struct sock_filter insns[BPF_MAXINSNS];
> >insn_cnt = ptrace(PTRACE_SECCOMP_GET_FILTER, pid, insns, i);
> 
> Would also be good that when the storage buffer (insns) is NULL,
> it just returns you the number of sock_filter insns (or 0 when
> nothing attached).
> 
> That would be consistent with classic socket filters (see
> sk_get_filter()), and user space could allocate a specific
> size instead of always passing in max insns.

Yep, the current set does this with SECCOMP_FD_DUMP and I agree that
it's nice behavior, so I'll plan on preserving it.

Thanks,

Tycho
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Thread

v5 of seccomp filter c/r patches Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-02 18:30 +0200
  Re: v5 of seccomp filter c/r patches Kees Cook <keescook@chromium.org> - 2015-10-02 23:20 +0200
    Re: v5 of seccomp filter c/r patches Andy Lutomirski <luto@amacapital.net> - 2015-10-02 23:40 +0200
      Re: v5 of seccomp filter c/r patches Kees Cook <keescook@chromium.org> - 2015-10-03 00:10 +0200
        Re: v5 of seccomp filter c/r patches Andy Lutomirski <luto@amacapital.net> - 2015-10-03 00:20 +0200
      Re: v5 of seccomp filter c/r patches Andy Lutomirski <luto@amacapital.net> - 2015-10-03 00:10 +0200
      Re: v5 of seccomp filter c/r patches Kees Cook <keescook@chromium.org> - 2015-10-03 00:10 +0200
    Re: v5 of seccomp filter c/r patches Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-03 00:50 +0200
      Re: v5 of seccomp filter c/r patches Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-03 01:00 +0200
      Re: v5 of seccomp filter c/r patches Daniel Borkmann <daniel@iogearbox.net> - 2015-10-03 01:00 +0200
        Re: v5 of seccomp filter c/r patches Tycho Andersen <tycho.andersen@canonical.com> - 2015-10-03 01:00 +0200
        Re: v5 of seccomp filter c/r patches Kees Cook <keescook@chromium.org> - 2015-10-03 01:10 +0200
      Re: v5 of seccomp filter c/r patches Andy Lutomirski <luto@amacapital.net> - 2015-10-03 01:00 +0200

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