linux-kernel - Re: [RFC][CFT][PATCHSET v1] uaccess unification

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Message-ID: <20170331133817.GH31606@jhogan-linux.le.imgtec.org>
Date:   Fri, 31 Mar 2017 14:38:17 +0100
From:   James Hogan <james.hogan@...tec.com>
To:     Kees Cook <keescook@...omium.org>
CC:     Al Viro <viro@...iv.linux.org.uk>,
        linux-arch <linux-arch@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Richard Henderson <rth@...ddle.net>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Haavard Skinnemoen <hskinnemoen@...il.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Steven Miao <realmz6@...il.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Mark Salter <msalter@...hat.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Richard Kuo <rkuo@...eaurora.org>,
        Tony Luck <tony.luck@...el.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michal Simek <monstr@...str.eu>,
        David Howells <dhowells@...hat.com>,
        Ley Foon Tan <lftan@...era.com>,
        Jonas Bonn <jonas@...thpole.se>, Helge Deller <deller@....de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Chen Liqin <liqin.linux@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Richard Weinberger <richard@....at>,
        Guan Xuetao <gxt@...c.pku.edu.cn>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chris Zankel <chris@...kel.net>
Subject: Re: [RFC][CFT][PATCHSET v1] uaccess unification

On Thu, Mar 30, 2017 at 05:21:32PM -0700, Kees Cook wrote:
> On Tue, Mar 28, 2017 at 10:57 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> > At the moment I have that conversion done for everything except ia64 and
> > metag.  Once everything is converted, I'll remove ARCH_HAS_RAW_COPY_USER
> > and make generic stuff unconditional; at the same point
> > HAVE_ARCH_HARDENED_USERCOPY will be gone (becoming unconditionally true).
> 
> Yay! :)

In the mean time should ARCH_HAS_RAW_COPY_USER select
HAVE_ARCH_HARDENED_USERCOPY?

FWIW I already have patches for metag to enable RAW_COPY_USER that just
need some more testing (mainly due to prerequisite user copy fixes), but
I don't know about ia64

Cheers
James

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