linux-kernel - Re: [RFC PATCH 7/9] proc: add /proc/<pid>/universe to show livepatch status

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Message-ID: <54DA5230.8020800@suse.cz>
Date:	Tue, 10 Feb 2015 19:47:12 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>, Vojtech Pavlik <vojtech@...e.cz>
CC:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 7/9] proc: add /proc/<pid>/universe to show livepatch
 status

On 02/09/2015, 06:31 PM, Josh Poimboeuf wrote:
> Expose the per-task klp_universe value so users can determine which
> tasks are holding up completion of a patching operation.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  fs/proc/base.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 3f3d7ae..b9fe6b5 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -2528,6 +2528,14 @@ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
>  	return err;
>  }
>  
> +#ifdef CONFIG_LIVEPATCH
> +static int proc_pid_klp_universe(struct seq_file *m, struct pid_namespace *ns,
> +				 struct pid *pid, struct task_struct *task)
> +{
> +	return seq_printf(m, "%d\n", task->klp_universe);
> +}
> +#endif /* CONFIG_LIVEPATCH */
> +
>  /*
>   * Thread groups
>   */
> @@ -2628,6 +2636,9 @@ static const struct pid_entry tgid_base_stuff[] = {
>  #ifdef CONFIG_CHECKPOINT_RESTORE
>  	REG("timers",	  S_IRUGO, proc_timers_operations),
>  #endif
> +#ifdef CONFIG_LIVEPATCH
> +	ONE("universe", S_IRUGO, proc_pid_klp_universe),

I am not sure if this can be UGO or if it should be USR only instead.
Leaving for discussion, but I incline to use USR to avoid *any* info
leakage.

> +#endif

regards,
-- 
js
suse labs
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