linux-kernel - Re: [RFC PATCH] asm/generic: introduce if_nospec and nospec

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Message-ID: <alpine.DEB.2.20.1801050906140.4515@hadrien>
Date:   Fri, 5 Jan 2018 09:11:59 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Pavel Machek <pavel@....cz>
cc:     Dan Williams <dan.j.williams@...el.com>,
        Julia Lawall <julia.lawall@...6.fr>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arch@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Alan Cox <alan@...ux.intel.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [RFC PATCH] asm/generic: introduce if_nospec and
 nospec_barrier

It looks like the problem in terms of detection is to find values that
should be annotated as __user.  Poking around a bit, it seems like this
tool is doing just that:

http://www.cs.umd.edu/~jfoster/cqual/

It dates from 2004, but perhaps the developer could be motivated to pick
it up again.

I don't think Coccinelle would be good for doing this (ie implementing
taint analysis) because the dataflow is too complicated.

julia