netdev - Re: v2 of seccomp filter c/r patches

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Message-ID: <CALCETrVxhNvmEdMq0XRy1YZ+oJLDwcmE1y6prs7FGGhsS-Y5gg@mail.gmail.com>
Date:	Tue, 15 Sep 2015 11:13:51 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Tycho Andersen <tycho.andersen@...onical.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Network Development <netdev@...r.kernel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Oleg Nesterov <oleg@...hat.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>,
	Linux API <linux-api@...r.kernel.org>,
	Will Drewry <wad@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Borkmann <daniel@...earbox.net>
Subject: Re: v2 of seccomp filter c/r patches

On Tue, Sep 15, 2015 at 9:07 AM, Tycho Andersen
<tycho.andersen@...onical.com> wrote:
> Hi Andy,
>
> On Mon, Sep 14, 2015 at 10:52:46AM -0700, Andy Lutomirski wrote:
>>
>> I'm not sure I entirely like this solution...
>
> Ok. Since we also aren't going to do all the eBPF stuff now, how about
> something that looks like this:
>
> struct seccomp_layer {
>   unsigned int size;
>   unsigned int type; /* SECCOMP_BPF_CLASSIC or SECCOMP_EBPF or ... */
>   bool inherited;
>   union {
>     unsigned int insn_cnt;
>     struct bpf_insn *insns;
>   };
> };
>
> with a ptrace command:
>
> ptrace(PTRACE_SECCOMP_DUMP_LAYER, pid, i, &layer);
>
> If we save a pointer to the current seccomp filter on fork (if there
> is one), then I think the inherited flag is just,
>
> inherited = is_ancestor(child->seccomp.filter, child->seccomp.inherited_filter)
>

I'm lost.  What is the inherited flag for?

--Andy
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