linux-kernel - Re: [PATCH] kernel/kmod: fix use-after-free of the sub

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Message-ID: <20141016174209.GB18318@redhat.com>
Date:	Thu, 16 Oct 2014 19:42:09 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	schwidefsky@...ibm.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] kernel/kmod: fix use-after-free of the sub_info
	structure

On 10/17, Tetsuo Handa wrote:
>
> For both UMH_NO_WAIT and UMH_WAIT_EXEC cases,
>
>   kernel_thread(call_helper, sub_info, CLONE_VFORK | SIGCHLD)
>
> in __call_usermodehelper() waits for do_execve() to succeed or do_exit(),

Well, not really. kernel_thread(CLONE_VFORK) waits for do_exit() or
exec_mmap(), and exec can fail after that.

Oleg.

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