linux-kernel - Re: [PATCH 4/5] Use copy_wait_opts_to_user() in wait_task

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Date:	Mon, 15 Jun 2009 18:43:24 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Vitaly Mayatskikh <v.mayatskih@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] Use copy_wait_opts_to_user() in wait_task_zombie()

On 05/11, Vitaly Mayatskikh wrote:
>
> @@ -1267,36 +1265,21 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
>  	 */
>  	read_unlock(&tasklist_lock);
>
> -	retval = wo->wo_rusage
> -		? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
>  	status = (p->signal->flags & SIGNAL_GROUP_EXIT)
>  		? p->signal->group_exit_code : p->exit_code;
> -	if (!retval && wo->wo_stat)
> +	if (wo->wo_stat)
>  		retval = put_user(status, wo->wo_stat);

We don't check retval, and then later

> [...snip...]
> +	retval = copy_wait_opts_to_user(wo, p, pid, uid, why, status, SIGCHLD);

we overwrite it.

This needs a fix.

Oleg.

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