[PATCH] drm/i915: disable KASAN for handlers

[PATCH] drm/i915: disable KASAN for handlers

[Jiri Slaby]

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@suse.cz>
Cc: Martin Liska <mliska@suse.cz>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: intel-gvt-dev@lists.freedesktop.org
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.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

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

[Zhenyu Wang]

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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@suse.cz>
> Cc: Martin Liska <mliska@suse.cz>
> Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
> Cc: Zhi Wang <zhi.a.wang@intel.com>
> Cc: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: intel-gvt-dev@lists.freedesktop.org
> Cc: intel-gfx@lists.freedesktop.org
> Cc: dri-devel@lists.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!

-- 
Open Source Technology Center, Intel ltd.

$gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827

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

[Jani Nikula]

On Fri, 31 Mar 2017, Zhenyu Wang <zhenyuw@linux.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@suse.cz>
>> Cc: Martin Liska <mliska@suse.cz>
>> Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
>> Cc: Zhi Wang <zhi.a.wang@intel.com>
>> Cc: Daniel Vetter <daniel.vetter@intel.com>
>> Cc: Jani Nikula <jani.nikula@linux.intel.com>
>> Cc: David Airlie <airlied@linux.ie>
>> Cc: intel-gvt-dev@lists.freedesktop.org
>> Cc: intel-gfx@lists.freedesktop.org
>> Cc: dri-devel@lists.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




-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH] drm/i915: disable KASAN for handlers

[Arnd Bergmann]

On Fri, Mar 31, 2017 at 12:29 PM, Jani Nikula
<jani.nikula@linux.intel.com> wrote:
> On Fri, 31 Mar 2017, Zhenyu Wang <zhenyuw@linux.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@suse.cz>
>>> Cc: Martin Liska <mliska@suse.cz>
>>> Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
>>> Cc: Zhi Wang <zhi.a.wang@intel.com>
>>> Cc: Daniel Vetter <daniel.vetter@intel.com>
>>> Cc: Jani Nikula <jani.nikula@linux.intel.com>
>>> Cc: David Airlie <airlied@linux.ie>
>>> Cc: intel-gvt-dev@lists.freedesktop.org
>>> Cc: intel-gfx@lists.freedesktop.org
>>> Cc: dri-devel@lists.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.

       Arnd
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Re: [PATCH] drm/i915: disable KASAN for handlers

[Jiri Slaby]

On 03/31/2017, 01:23 PM, Arnd Bergmann wrote:
> On Fri, Mar 31, 2017 at 12:29 PM, Jani Nikula
> <jani.nikula@linux.intel.com> wrote:
>> On Fri, 31 Mar 2017, Zhenyu Wang <zhenyuw@linux.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@suse.cz>
>>>> Cc: Martin Liska <mliska@suse.cz>
>>>> Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
>>>> Cc: Zhi Wang <zhi.a.wang@intel.com>
>>>> Cc: Daniel Vetter <daniel.vetter@intel.com>
>>>> Cc: Jani Nikula <jani.nikula@linux.intel.com>
>>>> Cc: David Airlie <airlied@linux.ie>
>>>> Cc: intel-gvt-dev@lists.freedesktop.org
>>>> Cc: intel-gfx@lists.freedesktop.org
>>>> Cc: dri-devel@lists.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
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