linux-kernel - Re: [PATCH V2] mm: Allow userland to request that the kernel clear memory on release

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Message-ID: <1df0ef0c-4219-c259-18a2-9abfb2782c08@suse.cz>
Date:   Thu, 25 Apr 2019 14:40:48 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>,
        Matthew Garrett <matthewgarrett@...gle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Matthew Garrett <mjg59@...gle.com>, linux-api@...r.kernel.org
Subject: Re: [PATCH V2] mm: Allow userland to request that the kernel clear
 memory on release

On 4/25/19 2:14 PM, Michal Hocko wrote:
> Please cc linux-api for user visible API proposals (now done). Keep the
> rest of the email intact for reference.
> 
> On Wed 24-04-19 14:10:39, Matthew Garrett wrote:
>> From: Matthew Garrett <mjg59@...gle.com>
>>
>> Applications that hold secrets and wish to avoid them leaking can use
>> mlock() to prevent the page from being pushed out to swap and
>> MADV_DONTDUMP to prevent it from being included in core dumps. Applications

So, do we really need a new madvise() flag and VMA flag, or can we just
infer this page clearing from mlock+MADV_DONTDUMP being both applied?