linux-kernel - Re: [RESEND PATCH V2 0/3] Allow user to request memory to be locked on page fault

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Message-ID: <CALCETrW5LWgcuezfNDGYmivydsM2U36MLS6n1ardmLgsSrAdmQ@mail.gmail.com>
Date:	Thu, 25 Jun 2015 07:26:14 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Eric B Munson <emunson@...mai.com>
Cc:	Vlastimil Babka <vbabka@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuahkh@....samsung.com>,
	Michal Hocko <mhocko@...e.cz>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-alpha@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [RESEND PATCH V2 0/3] Allow user to request memory to be locked
 on page fault

On Thu, Jun 25, 2015 at 7:16 AM, Eric B Munson <emunson@...mai.com> wrote:
> On Tue, 23 Jun 2015, Vlastimil Babka wrote:
>
>> On 06/15/2015 04:43 PM, Eric B Munson wrote:
>> >>
>> >>If the new LOCKONFAULT functionality is indeed desired (I haven't
>> >>still decided myself) then I agree that would be the cleanest way.
>> >
>> >Do you disagree with the use cases I have listed or do you think there
>> >is a better way of addressing those cases?
>>
>> I'm somewhat sceptical about the security one. Are security
>> sensitive buffers that large to matter? The performance one is more
>> convincing and I don't see a better way, so OK.
>
> They can be, the two that come to mind are medical images and high
> resolution sensor data.

I think we've been handling sensitive memory pages wrong forever.  We
shouldn't lock them into memory; we should flag them as sensitive and
encrypt them if they're ever written out to disk.

--Andy
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