linux-kernel - Re: [PATCH v3 1/4] seccomp: Add sysctl to display available actions

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Message-ID: <CALCETrUOvX3krKsrhZmU3QSq1JLX4F3TTV2B8_ybGjd4Yw2HAA@mail.gmail.com>
Date:   Wed, 15 Feb 2017 19:14:50 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Tyler Hicks <tyhicks@...onical.com>
Cc:     Paul Moore <paul@...l-moore.com>, Eric Paris <eparis@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Will Drewry <wad@...omium.org>, linux-audit@...hat.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        John Crispin <john@...ozen.org>, linux-api@....kernel.org
Subject: Re: [PATCH v3 1/4] seccomp: Add sysctl to display available actions

On Mon, Feb 13, 2017 at 7:45 PM, Tyler Hicks <tyhicks@...onical.com> wrote:
> This patch creates a read-only sysctl containing an ordered list of
> seccomp actions that the kernel supports. The ordering, from left to
> right, is the lowest action value (kill) to the highest action value
> (allow). Currently, a read of the sysctl file would return "kill trap
> errno trace allow". The contents of this sysctl file can be useful for
> userspace code as well as the system administrator.

Would this make more sense as a new seccomp(2) mode a la
SECCOMP_HAS_ACTION?  Then sandboxy things that have no fs access could
use it.

--Andy