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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Cc: Dave Martin <Dave.Martin@arm.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	linux-doc@vger.kernel.org,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Paul Lawrence <paullawrence@google.com>,
	Linux Memory Management List <linux-mm@kvack.org>,
	Alexander Potapenko <glider@google.com>,
	Chintan Pandya <cpandya@codeaurora.org>,
	Christoph Lameter <cl@linux.com>, Ingo Molnar <mingo@kernel.org>,
	Jacob Bramley <Jacob.Bramley@arm.com>,
	Jann Horn <jannh@google.com>, Mark Brand <markbrand@google.com>,
	kasan-dev <kasan-dev@googlegroups.com>,
	linux-sparse@vger.kernel.org,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Evgeniy Stepanov <eugenis@google.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
	Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Kostya Serebryany <kcc@google.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	LKML <linux-kernel@vger.kernel.org>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	Lee Smith <Lee.Smith@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	smatch@vger.kernel.org
Subject: Re: [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer
Date: Fri, 29 Jun 2018 16:42:57 +0300	[thread overview]
Message-ID: <20180629134257.ci5ninozkh2ni6wd@mwanda> (raw)
In-Reply-To: <20180629112613.7i4xesjyxolc63gu@ltop.local>

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


  parent reply	other threads:[~2018-06-29 13:45 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-26 13:15 [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 01/17] khwasan, mm: change kasan hooks signatures Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 02/17] khwasan: move common kasan and khwasan code to common.c Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 03/17] khwasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_HW Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 04/17] khwasan, arm64: adjust shadow size for CONFIG_KASAN_HW Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 05/17] khwasan: initialize shadow to 0xff Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 06/17] khwasan, arm64: untag virt address in __kimg_to_phys and _virt_addr_is_linear Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 07/17] khwasan: add tag related helper functions Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 08/17] khwasan, arm64: fix up fault handling logic Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 09/17] khwasan, arm64: enable top byte ignore for the kernel Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 10/17] khwasan, mm: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 11/17] khwasan: split out kasan_report.c from report.c Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 12/17] khwasan: add bug reporting routines Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 13/17] khwasan: add hooks implementation Andrey Konovalov
2018-07-25 13:44   ` Vincenzo Frascino@Foss
2018-07-31 13:05     ` Andrey Konovalov
2018-07-31 14:50       ` Andrey Ryabinin
2018-07-31 15:03         ` Dmitry Vyukov
2018-07-31 15:38           ` Christopher Lameter
2018-07-31 16:03             ` Dmitry Vyukov
2018-07-31 16:04           ` Andrey Ryabinin
2018-07-31 16:08             ` Dmitry Vyukov
2018-07-31 16:18               ` Andrey Ryabinin
2018-07-31 15:21         ` Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 14/17] khwasan, arm64: add brk handler for inline instrumentation Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 15/17] khwasan, mm, arm64: tag non slab memory allocated via pagealloc Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 16/17] khwasan: update kasan documentation Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 17/17] kasan: add SPDX-License-Identifier mark to source files Andrey Konovalov
2018-06-27 23:08 ` [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer Andrew Morton
2018-06-28  0:04   ` Kostya Serebryany
     [not found]     ` <CAEZpscCcP6=O_OCqSwW8Y6u9Ee99SzWN+hRcgpP2tK=OEBFnNw@mail.gmail.com>
2018-06-28  1:11       ` Andrew Morton
2018-06-28 18:26         ` Andrey Konovalov
2018-06-28  7:01     ` Geert Uytterhoeven
2018-07-02 20:33     ` Matthew Wilcox
2018-07-02 23:39       ` Evgenii Stepanov
2018-06-28 18:29   ` Andrey Konovalov
2018-06-28 19:40     ` Andrew Morton
2018-06-29 12:45       ` Andrey Konovalov
2018-06-29 13:01         ` Mark Rutland
2018-06-29 14:40           ` Andrey Konovalov
2018-06-30  2:41         ` Andrew Morton
2018-07-02 19:16           ` Evgenii Stepanov
2018-07-02 19:21             ` Andrew Morton
2018-07-02 20:22               ` Evgenii Stepanov
2018-07-02 20:30                 ` Andrew Morton
2018-06-28 10:51 ` Dave Martin
2018-06-28 18:56   ` Andrey Konovalov
2018-06-29 10:14     ` Mark Rutland
2018-06-29 11:04     ` Dave Martin
2018-06-29 11:26       ` Luc Van Oostenryck
2018-06-29 13:18         ` Andrey Konovalov
2018-06-29 13:42         ` Dan Carpenter [this message]
2018-06-29 11:07     ` Catalin Marinas
2018-06-29 11:07     ` Will Deacon
2018-06-29 16:36       ` Andrey Konovalov
2018-07-03 17:36         ` Will Deacon
2018-07-18 17:16           ` Andrey Konovalov
2018-07-31 13:22             ` Andrey Konovalov
2018-08-01 16:35               ` Will Deacon
2018-08-01 16:52                 ` Dmitry Vyukov
2018-08-02 11:10                   ` Catalin Marinas
2018-08-02 11:36                     ` Dmitry Vyukov
2018-08-02 13:52                       ` Catalin Marinas
2018-08-02 14:11                         ` Andrey Ryabinin
2018-08-03  9:23                   ` Will Deacon
2018-08-03  9:42                     ` Dmitry Vyukov
2018-08-08 16:27                       ` Will Deacon
2018-08-08 16:53                         ` Dmitry Vyukov

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