linux-kernel - Re: [PATCH] proc: add "Seccomp" to status

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Date:	Wed, 31 Oct 2012 17:11:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Will Drewry <wad@...omium.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] proc: add "Seccomp" to status

On Wed, 31 Oct 2012 13:09:27 -0700
Kees Cook <keescook@...omium.org> wrote:

> Adds the seccomp mode to the /proc/$pid/status file so the state of
> seccomp can be externally examined.

There's no reason here for anyone to apply this patch to anything. 
Presumably you see some value to our users - please share your thoughts
with us ;)

> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c
> @@ -327,6 +327,13 @@ static inline void task_cap(struct seq_file *m, struct task_struct *p)
>  	render_cap_t(m, "CapBnd:\t", &cap_bset);
>  }
>  
> +static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
> +{
> +#ifdef CONFIG_SECCOMP

hm, OK, cpuset_task_status_allowed() is a no-op if CONFIG_CPUSETS=n, so
there is precedent for fields vanishing with Kconfig changes.

> +	seq_printf(m, "Seccomp:\t%d\n", p->seccomp.mode);

Get thee yon unto Documentation/filesystems/proc.txt!

> +#endif
> +}

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