linux-kernel - Re: PATCH? fix unshare(NEWPID) && vfork()

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Message-ID: <CALCETrXnf8V+CgHDwEEviBkn0bJ60_H6G6WPmZxkQF85bqj3TQ@mail.gmail.com>
Date:	Tue, 20 Aug 2013 12:38:53 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Brad Spengler <spender@...ecurity.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Colin Walters <walters@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: PATCH? fix unshare(NEWPID) && vfork()

On Tue, Aug 20, 2013 at 12:23 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> On 08/20, Andy Lutomirski wrote:
>>
>> On Tue, Aug 20, 2013 at 12:05 PM, Oleg Nesterov <oleg@...hat.com> wrote:
>> > On 08/20, Andy Lutomirski wrote:
>> Huh?  Doesn't this mean that unshare(CLONE_NEWPID); vfork() will work
>> with your patches,
>
> I hope,
>
>> but vfork(); unshare(CLONE_NEWPID) will fail?  (I
>> admit I haven't tested it.)
>
> Do you mean that the child does unshare(CLONE_NEWPID) before exec?
> It should fail with or without this patch.
>

Exactly. Shouldn't it succeed?

--Andy
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