Date: Thu, 22 Oct 2020 10:55:57 +0200 From: Michal Hocko <mhocko@...e.com> To: David Hildenbrand <david@...hat.com> Cc: Mike Kravetz <mike.kravetz@...cle.com>, "Guilherme G. Piccoli" <gpiccoli@...onical.com>, linux-mm@...ck.org, kernel-hardening@...ts.openwall.com, linux-hardening@...r.kernel.org, linux-security-module@...r.kernel.org, kernel@...ccoli.net, cascardo@...onical.com, Alexander Potapenko <glider@...gle.com>, James Morris <jamorris@...ux.microsoft.com>, Kees Cook <keescook@...omium.org> 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 SUSE Labs
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.