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Date: Thu, 28 Mar 2019 09:52:09 -0700
From: Kees Cook <>
To: Joel Fernandes <>
Cc: Jann Horn <>, "Eric W. Biederman" <>, 
	LKML <>, 
	Android Kernel Team <>, 
	Kernel Hardening <>, 
	Andrew Morton <>, Matthew Wilcox <>, 
	Michal Hocko <>, Oleg Nesterov <>, 
	"Reshetova, Elena" <>
Subject: Re: [PATCH] Convert struct pid count to refcount_t

On Thu, Mar 28, 2019 at 7:37 AM Joel Fernandes <> wrote:
> Kees can you describe more the race you had in mind?

I just didn't see any barriers, so it seemed racey to me.

> Also note to the on looker, the original patch I sent is not wrong, that
> still applies and is correct. We are just discussing here any possible issues
> with the *existing* code.

Correct. And akpm has (correctly) taken this for -mm.

Kees Cook

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