Re: [PATCH 2/3] mm/filemap: initiate readahead even if IOCB_NOWAIT is set for the I/O

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To: Daniel Gruss <daniel@xxxxxxxx>
Subject: Re: [PATCH 2/3] mm/filemap: initiate readahead even if IOCB_NOWAIT is set for the I/O
From: Jiri Kosina <jikos@xxxxxxxxxx>
Date: Thu, 31 Jan 2019 13:08:00 +0100 (CET)
Cc: Vlastimil Babka <vbabka@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-api@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Dominique Martinet <asmadeus@xxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Kevin Easton <kevin@xxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Cyril Hrubis <chrubis@xxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx>
In-reply-to: <aea9a09a-9d01-fd08-d210-96b94162aba6@gruss.cc>
References: <nycvar.YFH.7.76.1901051817390.16954@cbobk.fhfr.pm> <20190130124420.1834-1-vbabka@suse.cz> <20190130124420.1834-3-vbabka@suse.cz> <aea9a09a-9d01-fd08-d210-96b94162aba6@gruss.cc>
User-agent: Alpine 2.21 (LSU 202 2017-01-01)

On Thu, 31 Jan 2019, Daniel Gruss wrote:

> If I understood it correctly, this patch just removes the advantages of 
> preadv2 over mmmap+access for the attacker.

Which is the desired effect. We are not trying to solve the timing aspect, 
as I don't think there is a reasonable way to do it, is there?

-- 
Jiri Kosina
SUSE Labs

Follow-Ups:
- Re: [PATCH 2/3] mm/filemap: initiate readahead even if IOCB_NOWAIT is set for the I/O
  - From: Daniel Gruss

References:
- [PATCH] mm/mincore: allow for making sys_mincore() privileged
  - From: Jiri Kosina
- [PATCH 0/3] mincore() and IOCB_NOWAIT adjustments
  - From: Vlastimil Babka
- [PATCH 2/3] mm/filemap: initiate readahead even if IOCB_NOWAIT is set for the I/O
  - From: Vlastimil Babka
- Re: [PATCH 2/3] mm/filemap: initiate readahead even if IOCB_NOWAIT is set for the I/O
  - From: Daniel Gruss

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