Re: [PATCH] kernel/kmod: fix use-after-free of the sub_info structure

[Oleg Nesterov]

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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