linux-kernel - Re: [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer

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Message-ID: <20180629134257.ci5ninozkh2ni6wd@mwanda>
Date:   Fri, 29 Jun 2018 16:42:57 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Dave Martin <Dave.Martin@....com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-doc@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Paul Lawrence <paullawrence@...gle.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Alexander Potapenko <glider@...gle.com>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Christoph Lameter <cl@...ux.com>,
        Ingo Molnar <mingo@...nel.org>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Jann Horn <jannh@...gle.com>,
        Mark Brand <markbrand@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        linux-sparse@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Lee Smith <Lee.Smith@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        smatch@...r.kernel.org
Subject: Re: [PATCH v4 00/17] khwasan: kernel hardware assisted address
 sanitizer

On Fri, Jun 29, 2018 at 01:26:14PM +0200, Luc Van Oostenryck wrote:
> On Fri, Jun 29, 2018 at 12:04:22PM +0100, Dave Martin wrote:
> > 
> > Can sparse be hacked to identify pointer subtractions where the pointers
> > are cannot be statically proved to point into the same allocation?
> 
> sparse only see the (deatils of) the function it analyses and all
> visible declarations, nothing more.
> 
> It would be more a job for smatch which do global analysis.
> But to identify such subtractions yu must already have a (good)
> pointer alias analysis which I don't think smatch do (but I can
> be wrong, Dan & smatch's ml added in CC).

That would be hard to manage.  Maybe in a year from now...

Pointer math errors tend to get caught pretty quick because they're on
the success path so I don't imagine there are huge numbers of bugs.

regards,
dan carpenter