linux-kernel - Re: [PATCH v3 4/5] kcmp: add KCMP_FILE_PRIVATE

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Message-ID: <CALCETrUosV+ND1BC-qH3xZMaLwnex50SvMhaSa3FQ19oy1MBVg@mail.gmail.com>
Date:	Wed, 30 Sep 2015 11:25:41 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Tycho Andersen <tycho.andersen@...onical.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Will Drewry <wad@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v3 4/5] kcmp: add KCMP_FILE_PRIVATE_DATA

On Wed, Sep 30, 2015 at 11:13 AM, Tycho Andersen
<tycho.andersen@...onical.com> wrote:
> This command allows comparing the underling private data of two fds. This
> is useful e.g. to find out if a seccomp filter is inherited, since struct
> seccomp_filter are unique across tasks and are the private_data seccomp
> fds.

This is very implementation-specific and may have nasty ABI
consequences far outside seccomp.  Let's do something specific to
seccomp and/or eBPF.

--Andy
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