From: Oleg Nesterov <oleg@redhat.com>
To: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"keescook@chromium.org" <keescook@chromium.org>,
"kosaki.motohiro@jp.fujitsu.com" <kosaki.motohiro@jp.fujitsu.com>,
"matthltc@us.ibm.com" <matthltc@us.ibm.com>,
"tj@kernel.org" <tj@kernel.org>,
Pavel Emelianov <xemul@parallels.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: + c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm- num_exe_file_vmas-removal.patch added to -mm tree
Date: Thu, 19 Apr 2012 23:51:09 +0200 [thread overview]
Message-ID: <20120419215109.GA4896@redhat.com> (raw)
In-Reply-To: <4F9087D0.60709@openvz.org>
On 04/20, Konstantin Khlebnikov wrote:
>
> Oleg Nesterov wrote:
>>
>> You misunderstood. I am not arguing with "one-shot", I do not really
>> care.
>>
>> My question is: unless I missed something "it can't be changed again"
>> is not actually true. A task does PR_SET_MM_EXE_FILE, then it forks
>> the new child. The child can do PR_SET_MM_EXE_FILE again. Is this
>> by design?
>>
>> Oleg.
>>
>
> I found more weird case: child thread (with CLONE_THREAD and without CLONE_VM)
> changes its exe_file...
No. copy_process() does:
if ((clone_flags & CLONE_THREAD) && !(clone_flags & CLONE_SIGHAND))
return ERR_PTR(-EINVAL);
if ((clone_flags & CLONE_SIGHAND) && !(clone_flags & CLONE_VM))
return ERR_PTR(-EINVAL);
IOW, CLONE_THREAD => CLONE_SIGHAND => CLONE_VM
Oleg.
next prev parent reply other threads:[~2012-04-19 21:51 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 18:52 + c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm-num_exe_file_vmas-removal.patch added to -mm tree akpm
2012-04-19 19:20 ` + c-r-prctl-add-ability-to-set-new-mm_struct-exe_file-update-after-mm- num_exe_file_vmas-removal.patch " Oleg Nesterov
2012-04-19 21:00 ` Cyrill Gorcunov
2012-04-19 21:12 ` Oleg Nesterov
2012-04-19 21:32 ` Cyrill Gorcunov
2012-04-19 22:08 ` Konstantin Khlebnikov
2012-04-19 22:16 ` Cyrill Gorcunov
2012-04-19 22:29 ` Oleg Nesterov
2012-04-19 21:46 ` Konstantin Khlebnikov
2012-04-19 21:51 ` Oleg Nesterov [this message]
2012-04-19 22:02 ` Cyrill Gorcunov
2012-04-19 22:09 ` Oleg Nesterov
2012-04-19 22:28 ` Konstantin Khlebnikov
2012-04-19 22:32 ` Cyrill Gorcunov
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