linux-kernel - Re: [PATCH 06/18] x86, barrier: stop speculation for failed access

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Message-ID: <20180107192418.0f0b66a8@alans-desktop>
Date:   Sun, 7 Jan 2018 19:24:18 +0000
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     James Bottomley <James.Bottomley@...senPartnership.com>
Cc:     David Miller <davem@...emloft.net>, w@....eu,
        alexei.starovoitov@...il.com, torvalds@...ux-foundation.org,
        dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, ak@...ux.intel.com, arnd@...db.de,
        gregkh@...uxfoundation.org, peterz@...radead.org,
        netdev@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
        tglx@...utronix.de
Subject: Re: [PATCH 06/18] x86, barrier: stop speculation for failed
 access_ok

> everyone.  I'm not saying this always happens, but it is reasonable to
> let the iterative pushback see if we can get to better code in this
> case rather than trying to cut it of with the "because *security*"
> argument.
> 

I'm not arguing otherwise - I'd just prefer most users machines are
secure while we have the discussion and while we see what other
architectural tricks people can come up with

Alan