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: Fri, 20 Apr 2012 00:29:50 +0200 [thread overview]
Message-ID: <20120419222950.GA5807@redhat.com> (raw)
In-Reply-To: <4F908CEB.8090606@openvz.org>
On 04/20, Konstantin Khlebnikov wrote:
>
>>> 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?
>>
>> Hmm, not sure, Konstantin?
>
> Why not? It has new pid, why it cannot change exe_file?
OK, if you do not see a problem - I agree with this patch.
I don't really understand what PR_SET_MM_EXE_FILE buys us if
parent/child can have different /proc/pid/exe links without
exec, but
> Actually I don't care too.
same here ;)
and at least this addresses the "establishes a bound on how
frequently the symlink can change" from Matt.
Oleg.
next prev parent reply other threads:[~2012-04-19 23:02 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 [this message]
2012-04-19 21:46 ` Konstantin Khlebnikov
2012-04-19 21:51 ` Oleg Nesterov
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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