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Date: Wed, 14 Sep 2016 11:43:54 -0700
From: Andy Lutomirski <luto@...capital.net>
To: Mickaël Salaün <mic@...ikod.net>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
Arnd Bergmann <arnd@...db.de>, Casey Schaufler <casey@...aufler-ca.com>,
Daniel Borkmann <daniel@...earbox.net>, Daniel Mack <daniel@...que.org>,
David Drysdale <drysdale@...gle.com>, "David S . Miller" <davem@...emloft.net>,
Elena Reshetova <elena.reshetova@...el.com>, "Eric W . Biederman" <ebiederm@...ssion.com>,
James Morris <james.l.morris@...cle.com>, Kees Cook <keescook@...omium.org>,
Paul Moore <pmoore@...hat.com>, Sargun Dhillon <sargun@...gun.me>,
"Serge E . Hallyn" <serge@...lyn.com>, Tejun Heo <tj@...nel.org>, Will Drewry <wad@...omium.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Linux API <linux-api@...r.kernel.org>,
LSM List <linux-security-module@...r.kernel.org>,
Network Development <netdev@...r.kernel.org>,
"open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC v3 11/22] seccomp,landlock: Handle Landlock hooks per
process hierarchy
On Wed, Sep 14, 2016 at 12:24 AM, Mickaël Salaün <mic@...ikod.net> wrote:
> A Landlock program will be triggered according to its subtype/origin
> bitfield. The LANDLOCK_FLAG_ORIGIN_SECCOMP value will trigger the
> Landlock program when a seccomp filter will return RET_LANDLOCK.
> Moreover, it is possible to return a 16-bit cookie which will be
> readable by the Landlock programs in its context.
Are you envisioning that the filters will return RET_LANDLOCK most of
the time or rarely? If it's most of the time, then maybe this could
be simplified a bit by unconditionally calling the landlock filter and
letting the landlock filter access a struct seccomp_data if needed.
>
> Only seccomp filters loaded from the same thread and before a Landlock
> program can trigger it through LANDLOCK_FLAG_ORIGIN_SECCOMP. Multiple
> Landlock programs can be triggered by one or more seccomp filters. This
> way, each RET_LANDLOCK (with specific cookie) will trigger all the
> allowed Landlock programs once.
This interface seems somewhat awkward. Should we not have a way to
atomicaly install a whole pile of landlock filters and associated
seccomp filter all at once?
--Andy
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