From: Cyrill Gorcunov <gorcunov@openvz.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Matt Helsley <matthltc@us.ibm.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Kees Cook <keescook@chromium.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Pavel Emelyanov <xemul@parallels.com>, Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/1] turn mm->exe_file into mm->exe_path
Date: Mon, 5 Mar 2012 22:25:22 +0400 [thread overview]
Message-ID: <20120305182522.GD12341@moon> (raw)
In-Reply-To: <20120305173314.GA17895@redhat.com>
On Mon, Mar 05, 2012 at 06:33:14PM +0100, Oleg Nesterov wrote:
>
> > Not sure where we may use PR_SET_MM_EXE_PATH with NULL to kill
> > num_exe_file_vmas from user space though
>
> Please see above:
>
> Why do we need mm->num_exe_file_vmas? Afaics it is only needed to
> "free" mm->exe_file if the application unmaps all these vmas. Say,
> to allow to unmount fs.
>
> If we remove this counter, the application can't do the final put.
> But if we add PR_SET_MM_EXE_PATH which accepts NULL we solve this
> problem and this works for c/r too.
>
> Of course, this is orthogonal to the patch I sent.
>
I see. Thanks, Oleg!
Cyrill
next prev parent reply other threads:[~2012-03-05 18:25 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-05 15:28 [PATCH 0/1] turn mm->exe_file into mm->exe_path Oleg Nesterov
2012-03-05 15:28 ` [PATCH 1/1] " Oleg Nesterov
2012-03-05 17:05 ` [PATCH 0/1] " Cyrill Gorcunov
2012-03-05 17:33 ` Oleg Nesterov
2012-03-05 18:25 ` Cyrill Gorcunov [this message]
2012-03-05 21:14 ` Matt Helsley
2012-03-06 16:28 ` Oleg Nesterov
2012-03-06 16:41 ` Cyrill Gorcunov
2012-03-06 18:16 ` Matt Helsley
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