linux-kernel - Re: [PATCH v3 2/3] seccomp_filters: system call filtering using BPF

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Date:	Fri, 13 Jan 2012 12:39:32 -0500
From:	Eric Paris <eparis@...hat.com>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org, keescook@...omium.org,
	john.johansen@...onical.com, serge.hallyn@...onical.com,
	coreyb@...ux.vnet.ibm.com, pmoore@...hat.com, djm@...drot.org,
	torvalds@...ux-foundation.org, segoon@...nwall.com,
	rostedt@...dmis.org, jmorris@...ei.org, scarybeasts@...il.com,
	avi@...hat.com, penberg@...helsinki.fi, viro@...iv.linux.org.uk,
	luto@....edu, mingo@...e.hu, akpm@...ux-foundation.org,
	khilman@...com, borislav.petkov@....com, amwang@...hat.com,
	oleg@...hat.com, ak@...ux.intel.com, eric.dumazet@...il.com,
	gregkh@...e.de, dhowells@...hat.com, daniel.lezcano@...e.fr,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, olofj@...omium.org,
	mhalcrow@...gle.com, dlaor@...hat.com, corbet@....net,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH v3 2/3] seccomp_filters: system call filtering using BPF

On Thu, 2012-01-12 at 17:38 -0600, Will Drewry wrote:

> diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
> index cc7a4e9..0296871 100644
> --- a/include/linux/seccomp.h
> +++ b/include/linux/seccomp.h

> -typedef struct { int mode; } seccomp_t;
> +struct seccomp_filter;
> +/**
> + * struct seccomp_struct - the state of a seccomp'ed process
> + *
> + * @mode:
> + *     if this is 0, seccomp is not in use.
> + *             is 1, the process is under standard seccomp rules.
> + *             is 2, the process is only allowed to make system calls where
> + *                   associated filters evaluate successfully.
> + * @filter: Metadata for filter if using CONFIG_SECCOMP_FILTER.
> + *          @filter must only be accessed from the context of current as there
> + *          is no guard.
> + */
> +typedef struct seccomp_struct {
> +	int mode;
> +#ifdef CONFIG_SECCOMP_FILTER
> +	struct seccomp_filter *filter;
> +#endif
> +} seccomp_t;
>  
>  extern void __secure_computing(int);
>  static inline void secure_computing(int this_syscall)

Can we get rid of all of the typedef stuff?  I know you didn't add it
but now seems like a good time to follow typical kernel semantics if you
have to re-rev for some other reason.

-Eric

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