linux-kernel - Re: [PATCH v21 1/4] mm: add VM_DROPPABLE for designating always lazily freeable mappings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3492ea69-54cd-4ba3-b328-2e76542ccc32@redhat.com>
Date: Mon, 8 Jul 2024 22:05:57 +0200
From: David Hildenbrand <david@...hat.com>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 linux-kernel@...r.kernel.org, patches@...ts.linux.dev, tglx@...utronix.de,
 linux-crypto@...r.kernel.org, linux-api@...r.kernel.org, x86@...nel.org,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>,
 Carlos O'Donell <carlos@...hat.com>, Florian Weimer <fweimer@...hat.com>,
 Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
 Christian Brauner <brauner@...nel.org>,
 David Hildenbrand <dhildenb@...hat.com>, linux-mm@...ck.org
Subject: Re: [PATCH v21 1/4] mm: add VM_DROPPABLE for designating always
 lazily freeable mappings

On 08.07.24 15:57, Jason A. Donenfeld wrote:
> On Mon, Jul 08, 2024 at 10:23:10AM +0200, David Hildenbrand wrote:
>>> As a side note, I'll raise that I am not a particular fan of the
>>> "droppable" terminology, at least with the "read 0s" approach.
>>>
>>>    From a user perspective, the memory might suddenly lose its state and
>>> read as 0s just like volatile memory when it loses power. "dropping
>>> pages" sounds more like an implementation detail.
>>
>> Long story short: it's the hypervisor that could be effectively
>> dropping/zeroing out that memory, not the guest VM. "NONVOLATILE" might
>> be clearer than "DROPPABLE".
> 
> Surely you mean "VOLATILE", not "NONVOLATILE", right?

Yes, typo :)

-- 
Cheers,

David / dhildenb