linux-kernel - Re: [PATCH] mm: Allow userland to request that the kernel clear memory on release

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]

Date:   Wed, 24 Apr 2019 13:22:32 -0700
From:   Matthew Garrett <mjg59@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-mm@...ck.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: Allow userland to request that the kernel clear
 memory on release

On Wed, Apr 24, 2019 at 1:20 PM Matthew Wilcox <willy@...radead.org> wrote:
> It depends on the semantics you want.  There's no legacy code to
> worry about here.  I was seeing this as the equivalent of an atexit()
> handler; userspace is saying "When this page is unmapped, zero it".
> So it doesn't matter that somebody else might be able to reference it --
> userspace could have zeroed it themselves.

Mm ok that seems reasonable. I'll rework with that in mind.