linux-kernel - Re: [PATCH v6 6/9] seccomp: add "seccomp" syscall

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Message-ID: <CALCETrVYVB0pMj61T9ZCAhgL6WYHAdDjiDe81O0e4tTQLtjDiQ@mail.gmail.com>
Date:	Fri, 13 Jun 2014 13:41:02 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Kees Cook <keescook@...omium.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Will Drewry <wad@...omium.org>,
	Julien Tinnes <jln@...omium.org>,
	David Drysdale <drysdale@...gle.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	John Johansen <john.johansen@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	X86 ML <x86@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-mips@...ux-mips.org,
	linux-arch <linux-arch@...r.kernel.org>,
	LSM List <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v6 6/9] seccomp: add "seccomp" syscall

On Tue, Jun 10, 2014 at 8:25 PM, Kees Cook <keescook@...omium.org> wrote:
> This adds the new "seccomp" syscall with both an "operation" and "flags"
> parameter for future expansion. The third argument is a pointer value,
> used with the SECCOMP_SET_MODE_FILTER operation. Currently, flags must
> be 0. This is functionally equivalent to prctl(PR_SET_SECCOMP, ...).

Question for the linux-abi people:

What's the preferred way to do this these days?  This syscall is a
general purpose "adjust the seccomp state" thing.  The alternative
would be a specific new syscall to add a filter with a flags argument.

--Andy
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