linux-kernel - Re: [2.6.31 and later] "struct pid" leak.

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Message-ID: <20100402152922.GA17727@redhat.com>
Date:	Fri, 2 Apr 2010 17:29:22 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>
Subject: Re: [2.6.31 and later] "struct pid" leak.

Serge, Catalin, thanks a lot for the debugging output you sent
me privately ;)

On 04/01, Serge E. Hallyn wrote:
>
> Quoting Oleg Nesterov (oleg@...hat.com):
> >
> > Oh. It is hardly possibly to find the unbalanced get_pid() via grep.
>
> Looking through vt_ioctl.c,

Yes, my first reaction was "it must be tty" too ;)

I seem to understand what happens. If I am right, it is possible
to leak the pid even without X.

I'll try to check my theory and send the patch soon...

Oleg.

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