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Date: Tue, 27 Mar 2018 16:03:42 -0700
From: Andrew Morton <>
To: Kees Cook <>
Cc: Peter Zijlstra <>, Ingo Molnar <>,
 Linus Torvalds <>,,
Subject: Re: [PATCH] task_struct: Only use anon struct under randstruct

On Tue, 27 Mar 2018 14:36:09 -0700 Kees Cook <> wrote:

> The original intent for always adding the anonymous struct in task_struct
> was to make sure we had compiler coverage. However, this caused
> pathological padding of 40 bytes at the start of task_struct.

Why?  What caused this padding?  It happens in all configs?

> Instead,
> move the anonymous struct to being only used when struct layout
> randomization is enabled.

So the mysterious 40 byte bloat is still present in this case?

> Reported-by: Peter Zijlstra <>
> Fixes: 29e48ce87f1e ("task_struct: Allow randomized")
> Cc:

Why cc:stable?

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