linux-kernel - Re: [RESEND][PATCH] prctl: update seccomp sections for mode 2 (BPF)

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Message-ID: <CAGXu5j+4e_NgSeUjSkFmewSzZLeiSVXcY0oCRxngmc83WWVKRg@mail.gmail.com>
Date:	Mon, 22 Oct 2012 08:15:33 -0700
From:	Kees Cook <keescook@...omium.org>
To:	mtk.manpages@...il.com
Cc:	linux-man@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, wad@...omium.org
Subject: Re: [RESEND][PATCH] prctl: update seccomp sections for mode 2 (BPF)

On Mon, Oct 22, 2012 at 12:34 AM, Michael Kerrisk (man-pages)
<mtk.manpages@...il.com> wrote:
> Kees,
>
> A couple of questions about SECCOMP_MODE_FILTER.
>
> I added some words that the arg3 is a pointer to 'struct fprog'. Can
> you confirmn that's correct?

Correct. Good idea to add this detail.

> If the CONFIG_SECCOMP_FILTER permits fork(), is the seccomp setting
> inherited across fork()? Similar question for execve().

Yes for both. Additionally, the filters are cumulative. (If the
filters allows prctl, additional filters can be appended; they are run
in order until the first non-allow result is seen.)

-Kees

-- 
Kees Cook
Chrome OS Security
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