linux-kernel - Re: [PATCH] drm/i915: disable KASAN for handlers

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Date:   Tue, 18 Jul 2017 07:48:37 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Arnd Bergmann <arnd@...db.de>,
        Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Zhenyu Wang <zhenyuw@...ux.intel.com>, Jiri Slaby <jslaby@...e.cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Martin Liska <mliska@...e.cz>, Zhi Wang <zhi.a.wang@...el.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/i915: disable KASAN for handlers

On 03/31/2017, 01:23 PM, Arnd Bergmann wrote:
> On Fri, Mar 31, 2017 at 12:29 PM, Jani Nikula
> <jani.nikula@...ux.intel.com> wrote:
>> On Fri, 31 Mar 2017, Zhenyu Wang <zhenyuw@...ux.intel.com> wrote:
>>> On 2017.03.30 11:46:27 +0200, Jiri Slaby wrote:
>>>> Handlers are currently the only blocker to compile the kernel with gcc 7
>>>> and KASAN+use-after-scope enabled:
>>>> drivers/gpu/drm/i915/gvt/handlers.c:2200:1: error: the frame size of 43760 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>>>> drivers/gpu/drm/i915/gvt/handlers.c:2402:1: error: the frame size of 9400 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>>>> drivers/gpu/drm/i915/gvt/handlers.c:2628:1: error: the frame size of 11256 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>>>>
>>>> It is due to many expansions of MMIO_* macros in init_generic_mmio_info.
>>>> INTEL_GVT_MMIO_OFFSET generates for each such line a __reg and an
>>>> offset. There are too many for KASAN to keep up.
>>>>
>>>> So disable KASAN for this file.
>>>>
>>>> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
>>>> Cc: Martin Liska <mliska@...e.cz>
>>>> Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
>>>> Cc: Zhi Wang <zhi.a.wang@...el.com>
>>>> Cc: Daniel Vetter <daniel.vetter@...el.com>
>>>> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
>>>> Cc: David Airlie <airlied@...ux.ie>
>>>> Cc: intel-gvt-dev@...ts.freedesktop.org
>>>> Cc: intel-gfx@...ts.freedesktop.org
>>>> Cc: dri-devel@...ts.freedesktop.org
>>>> ---
>>>>  drivers/gpu/drm/i915/gvt/Makefile | 2 ++
>>>>  1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/i915/gvt/Makefile b/drivers/gpu/drm/i915/gvt/Makefile
>>>> index b123c20e2097..942f1849d194 100644
>>>> --- a/drivers/gpu/drm/i915/gvt/Makefile
>>>> +++ b/drivers/gpu/drm/i915/gvt/Makefile
>>>> @@ -6,3 +6,5 @@ GVT_SOURCE := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o firmware.o \
>>>>  ccflags-y                           += -I$(src) -I$(src)/$(GVT_DIR) -Wall
>>>>  i915-y                                      += $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))
>>>>  obj-$(CONFIG_DRM_I915_GVT_KVMGT)    += $(GVT_DIR)/kvmgt.o
>>>> +
>>>> +KASAN_SANITIZE_handlers.o := n
>>>> --
>>>> 2.12.2
>>>>
>>>
>>> Applied this, we'd better cleanup legacy usage to current i915 mmio
>>> reg define. Thanks!
>>
>> Hmmh, that was a bit fast, there was a related discussion going in [1].
>>
>> BR,
>> Jani.
>>
>>
>> [1] http://mid.mail-archive.com/20170320215713.3086140-1-arnd@arndb.de
> 
> Sorry about that, it looked like I never replied to your last mail.
> 
> There is also a related problem that I had sent another fix for:
> https://patchwork.kernel.org/patch/9601349/
> 
> I still think that my two patches are correct and they should both be applied.

Hi,

have they been applied yet? Or was this fixed some other way?

thanks,
-- 
js
suse labs