Re: cgroup_release_agent() with call_usermodehelper() withUMH_WAIT_EXEC may crash

From: Linus Torvalds
Date: Sat Feb 04 2012 - 10:17:10 EST

On Sat, Feb 4, 2012 at 2:03 AM, Heiko Carstens
<heiko.carstens@xxxxxxxxxx> wrote:
> Something like the patch below? Still boots...

Yes, except that if we touch the comm copying code, let's do what Oleg
suggested and make it a helper function to create the "comm[]" data
array instead of open-coding it and adding new random local variables
to prepare_binprm().

But looks good otherwise. I'm a *bit* nervous that some
prepare_binprm() caller hasn't set up bprm->filename that early yet,
though. It seems like we expect that to be set up by the caller, which
seems a bit odd, actually.

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