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Date: Thu, 22 Oct 2020 10:55:57 +0200
From: Michal Hocko <>
To: David Hildenbrand <>
Cc: Mike Kravetz <>,
	"Guilherme G. Piccoli" <>,,,,,,, Alexander Potapenko <>,
	James Morris <>,
	Kees Cook <>
Subject: Re: [PATCH] mm, hugetlb: Avoid double clearing for hugetlb pages

On Thu 22-10-20 10:04:50, David Hildenbrand wrote:
> > None of that would address the original point of this thread, the global
> > init_on_alloc parameter.
> Yes, but I guess we're past that: whatever leaves the buddy shall be
> zeroed out. That's the whole point of that security hardening mechanism.

Hugetlb can control its zeroying behavior via mount option (for
MAP_HUGETLB controled by a command line parameter). If the page fault
handler can recognize the pre-initialized pages then both init_on* can
be implemented along with such a hugetlb specific mechanism.
Michal Hocko

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