linux-kernel - Re: [PATCH 1/2] prctl: Add PR_SET

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Date:	Sun, 15 Apr 2012 10:54:01 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>, linux-man@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 1/2] prctl: Add PR_SET_MM option description

On Sun, Apr 15, 2012 at 03:48:18PM +1200, Michael Kerrisk (man-pages) wrote:
> Cyrill,
> 
> While reviewing your patch to the prctl() manual page, I noticed the
> following code inkernel/sys.c::prctl_set_mm():
> 
>         if (opt != PR_SET_MM_START_BRK && opt != PR_SET_MM_BRK) {
>                 /* It must be existing VMA */
>                 if (!vma || vma->vm_start > addr)
>                         goto out;
>         }
> 
> At this point, the code causes an exit with error set to zero (i.e.,
> success). This looks unintended to me. Is the code correct? I suspect
> a return of -EFAULT or -ENOMEM is warranted.

Hi Michael, yup, -EINVAL escaped (I think EFAULT or ENOMEM is not really
good here). I'll fix and send update. Thanks!

	Cyrill
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