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

To: Andy Lutomirski <luto@amacapital.net>
Subject: Re: [PATCH v8 5/9] seccomp: split mode set routines
From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 25 Jun 2014 19:32:45 +0200
Cc: Kees Cook <keescook@chromium.org>, LKML <linux-kernel@vger.kernel.org>, "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>, Alexei Starovoitov <ast@plumgrid.com>, Andrew Morton <akpm@linux-foundation.org>, Daniel Borkmann <dborkman@redhat.com>, Will Drewry <wad@chromium.org>, Julien Tinnes <jln@chromium.org>, David Drysdale <drysdale@google.com>, Linux API <linux-api@vger.kernel.org>, "x86@kernel.org" <x86@kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, linux-mips@linux-mips.org, linux-arch <linux-arch@vger.kernel.org>, linux-security-module <linux-security-module@vger.kernel.org>
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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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