* [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2)
@ 2021-09-10 10:09 Guchun Chen
2021-09-10 18:24 ` Robin Murphy
0 siblings, 1 reply; 4+ messages in thread
From: Guchun Chen @ 2021-09-10 10:09 UTC (permalink / raw)
To: amd-gfx, dri-devel, christian.koenig, xinhui.pan, alexander.deucher
Cc: Guchun Chen, Leslie Shi
Vendor will define their own memory types on top of TTM_PL_PRIV,
but call ttm_set_driver_manager directly without checking mem_type
value when setting up memory manager. So add such check to aware
the case when array bounds.
v2: lower check level to WARN_ON
Signed-off-by: Leslie Shi <Yuliang.Shi@amd.com>
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
---
include/drm/ttm/ttm_device.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
index 07d722950d5b..aa79953c807c 100644
--- a/include/drm/ttm/ttm_device.h
+++ b/include/drm/ttm/ttm_device.h
@@ -291,6 +291,7 @@ ttm_manager_type(struct ttm_device *bdev, int mem_type)
static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
struct ttm_resource_manager *manager)
{
+ WARN_ON(type >= TTM_NUM_MEM_TYPES);
bdev->man_drv[type] = manager;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2)
2021-09-10 10:09 [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2) Guchun Chen
@ 2021-09-10 18:24 ` Robin Murphy
2021-09-13 2:35 ` Chen, Guchun
0 siblings, 1 reply; 4+ messages in thread
From: Robin Murphy @ 2021-09-10 18:24 UTC (permalink / raw)
To: Guchun Chen, amd-gfx, dri-devel, christian.koenig, xinhui.pan,
alexander.deucher
Cc: Leslie Shi
On 2021-09-10 11:09, Guchun Chen wrote:
> Vendor will define their own memory types on top of TTM_PL_PRIV,
> but call ttm_set_driver_manager directly without checking mem_type
> value when setting up memory manager. So add such check to aware
> the case when array bounds.
>
> v2: lower check level to WARN_ON
>
> Signed-off-by: Leslie Shi <Yuliang.Shi@amd.com>
> Signed-off-by: Guchun Chen <guchun.chen@amd.com>
> ---
> include/drm/ttm/ttm_device.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
> index 07d722950d5b..aa79953c807c 100644
> --- a/include/drm/ttm/ttm_device.h
> +++ b/include/drm/ttm/ttm_device.h
> @@ -291,6 +291,7 @@ ttm_manager_type(struct ttm_device *bdev, int mem_type)
> static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
> struct ttm_resource_manager *manager)
> {
> + WARN_ON(type >= TTM_NUM_MEM_TYPES);
Nit: I know nothing about this code, but from the context alone it would
seem sensible to do
if (WARN_ON(type >= TTM_NUM_MEM_TYPES))
return;
to avoid making the subsequent assignment when we *know* it's invalid
and likely to corrupt memory.
Robin.
> bdev->man_drv[type] = manager;
> }
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2)
2021-09-10 18:24 ` Robin Murphy
@ 2021-09-13 2:35 ` Chen, Guchun
2021-09-13 6:23 ` Christian König
0 siblings, 1 reply; 4+ messages in thread
From: Chen, Guchun @ 2021-09-13 2:35 UTC (permalink / raw)
To: Robin Murphy, amd-gfx, dri-devel, Koenig, Christian, Pan, Xinhui,
Deucher, Alexander
Cc: Shi, Leslie
[Public]
Thanks for your suggestion, Robin. Do you agree with this as well, Christian and Xinhui?
Regards,
Guchun
-----Original Message-----
From: Robin Murphy <robin.murphy@arm.com>
Sent: Saturday, September 11, 2021 2:25 AM
To: Chen, Guchun <Guchun.Chen@amd.com>; amd-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; Koenig, Christian <Christian.Koenig@amd.com>; Pan, Xinhui <Xinhui.Pan@amd.com>; Deucher, Alexander <Alexander.Deucher@amd.com>
Cc: Shi, Leslie <Yuliang.Shi@amd.com>
Subject: Re: [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2)
On 2021-09-10 11:09, Guchun Chen wrote:
> Vendor will define their own memory types on top of TTM_PL_PRIV, but
> call ttm_set_driver_manager directly without checking mem_type value
> when setting up memory manager. So add such check to aware the case
> when array bounds.
>
> v2: lower check level to WARN_ON
>
> Signed-off-by: Leslie Shi <Yuliang.Shi@amd.com>
> Signed-off-by: Guchun Chen <guchun.chen@amd.com>
> ---
> include/drm/ttm/ttm_device.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/include/drm/ttm/ttm_device.h
> b/include/drm/ttm/ttm_device.h index 07d722950d5b..aa79953c807c 100644
> --- a/include/drm/ttm/ttm_device.h
> +++ b/include/drm/ttm/ttm_device.h
> @@ -291,6 +291,7 @@ ttm_manager_type(struct ttm_device *bdev, int mem_type)
> static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
> struct ttm_resource_manager *manager)
> {
> + WARN_ON(type >= TTM_NUM_MEM_TYPES);
Nit: I know nothing about this code, but from the context alone it would seem sensible to do
if (WARN_ON(type >= TTM_NUM_MEM_TYPES))
return;
to avoid making the subsequent assignment when we *know* it's invalid and likely to corrupt memory.
Robin.
> bdev->man_drv[type] = manager;
> }
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2)
2021-09-13 2:35 ` Chen, Guchun
@ 2021-09-13 6:23 ` Christian König
0 siblings, 0 replies; 4+ messages in thread
From: Christian König @ 2021-09-13 6:23 UTC (permalink / raw)
To: Chen, Guchun, Robin Murphy, amd-gfx, dri-devel, Pan, Xinhui,
Deucher, Alexander
Cc: Shi, Leslie
Well it will crash later on when accessing the invalid offset, so not
much gained.
But either way works for me.
Christian.
Am 13.09.21 um 04:35 schrieb Chen, Guchun:
> [Public]
>
> Thanks for your suggestion, Robin. Do you agree with this as well, Christian and Xinhui?
>
> Regards,
> Guchun
>
> -----Original Message-----
> From: Robin Murphy <robin.murphy@arm.com>
> Sent: Saturday, September 11, 2021 2:25 AM
> To: Chen, Guchun <Guchun.Chen@amd.com>; amd-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; Koenig, Christian <Christian.Koenig@amd.com>; Pan, Xinhui <Xinhui.Pan@amd.com>; Deucher, Alexander <Alexander.Deucher@amd.com>
> Cc: Shi, Leslie <Yuliang.Shi@amd.com>
> Subject: Re: [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2)
>
> On 2021-09-10 11:09, Guchun Chen wrote:
>> Vendor will define their own memory types on top of TTM_PL_PRIV, but
>> call ttm_set_driver_manager directly without checking mem_type value
>> when setting up memory manager. So add such check to aware the case
>> when array bounds.
>>
>> v2: lower check level to WARN_ON
>>
>> Signed-off-by: Leslie Shi <Yuliang.Shi@amd.com>
>> Signed-off-by: Guchun Chen <guchun.chen@amd.com>
>> ---
>> include/drm/ttm/ttm_device.h | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/include/drm/ttm/ttm_device.h
>> b/include/drm/ttm/ttm_device.h index 07d722950d5b..aa79953c807c 100644
>> --- a/include/drm/ttm/ttm_device.h
>> +++ b/include/drm/ttm/ttm_device.h
>> @@ -291,6 +291,7 @@ ttm_manager_type(struct ttm_device *bdev, int mem_type)
>> static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
>> struct ttm_resource_manager *manager)
>> {
>> + WARN_ON(type >= TTM_NUM_MEM_TYPES);
> Nit: I know nothing about this code, but from the context alone it would seem sensible to do
>
> if (WARN_ON(type >= TTM_NUM_MEM_TYPES))
> return;
>
> to avoid making the subsequent assignment when we *know* it's invalid and likely to corrupt memory.
>
> Robin.
>
>> bdev->man_drv[type] = manager;
>> }
>>
>>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-09-13 6:23 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2021-09-10 10:09 [PATCH] drm/ttm: add a WARN_ON in ttm_set_driver_manager when array bounds (v2) Guchun Chen
2021-09-10 18:24 ` Robin Murphy
2021-09-13 2:35 ` Chen, Guchun
2021-09-13 6:23 ` Christian König
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