linux-kernel - Re: [PATCH v8 5/9] seccomp: split mode set routines

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Message-ID: <20140625173245.GA17695@redhat.com>
Date:	Wed, 25 Jun 2014 19:32:45 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Kees Cook <keescook@...omium.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Will Drewry <wad@...omium.org>,
	Julien Tinnes <jln@...omium.org>,
	David Drysdale <drysdale@...gle.com>,
	Linux API <linux-api@...r.kernel.org>,
	"x86@...nel.org" <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>,
	linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v8 5/9] seccomp: split mode set routines

On 06/25, Andy Lutomirski wrote:
>
> Write the filter, then smp_mb (or maybe a weaker barrier is okay),
> then set the bit.

Yes, exactly, this is what I meant. Plas rmb() in __secure_computing().

But I still can't understand the rest of your discussion about the
ordering we need ;)

Oleg.

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