netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [PATCH][next] iavf: Replace one-element array in struct virtchnl_iwarp_qvlist_info and iavf_qvlist_info
@ 2021-05-25 23:04 Gustavo A. R. Silva
  2022-06-17 16:00 ` [Intel-wired-lan] " Gustavo A. R. Silva
  0 siblings, 1 reply; 3+ messages in thread
From: Gustavo A. R. Silva @ 2021-05-25 23:04 UTC (permalink / raw)
  To: Jesse Brandeburg, Tony Nguyen, David S. Miller, Jakub Kicinski
  Cc: intel-wired-lan, netdev, linux-kernel, Gustavo A. R. Silva,
	linux-hardening

There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].

Refactor the code according to the use of a flexible-array member in struct
virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element array,
and use the flex_array_size() helper.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/79
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 2 +-
 drivers/net/ethernet/intel/iavf/iavf_client.c      | 2 +-
 drivers/net/ethernet/intel/iavf/iavf_client.h      | 2 +-
 include/linux/avf/virtchnl.h                       | 8 ++++----
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index c0afac8cf33b..6c55fe9cc132 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -515,7 +515,7 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
 
 	kfree(vf->qvlist_info);
 	vf->qvlist_info = kzalloc(struct_size(vf->qvlist_info, qv_info,
-					      qvlist_info->num_vectors - 1),
+					      qvlist_info->num_vectors),
 				  GFP_KERNEL);
 	if (!vf->qvlist_info) {
 		ret = -ENOMEM;
diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.c b/drivers/net/ethernet/intel/iavf/iavf_client.c
index 0c77e4171808..e70da05ef322 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_client.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_client.c
@@ -470,7 +470,7 @@ static int iavf_client_setup_qvlist(struct iavf_info *ldev,
 
 	v_qvlist_info = (struct virtchnl_iwarp_qvlist_info *)qvlist_info;
 	msg_size = struct_size(v_qvlist_info, qv_info,
-			       v_qvlist_info->num_vectors - 1);
+			       v_qvlist_info->num_vectors);
 
 	adapter->client_pending |= BIT(VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP);
 	err = iavf_aq_send_msg_to_pf(&adapter->hw,
diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.h b/drivers/net/ethernet/intel/iavf/iavf_client.h
index 9a7cf39ea75a..b14a82b65626 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_client.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_client.h
@@ -53,7 +53,7 @@ struct iavf_qv_info {
 
 struct iavf_qvlist_info {
 	u32 num_vectors;
-	struct iavf_qv_info qv_info[1];
+	struct iavf_qv_info qv_info[];
 };
 
 #define IAVF_CLIENT_MSIX_ALL 0xFFFFFFFF
diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h
index 85a687bc6096..15b982911321 100644
--- a/include/linux/avf/virtchnl.h
+++ b/include/linux/avf/virtchnl.h
@@ -658,10 +658,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_iwarp_qv_info);
 
 struct virtchnl_iwarp_qvlist_info {
 	u32 num_vectors;
-	struct virtchnl_iwarp_qv_info qv_info[1];
+	struct virtchnl_iwarp_qv_info qv_info[];
 };
 
-VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_iwarp_qvlist_info);
+VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_iwarp_qvlist_info);
 
 /* VF reset states - these are written into the RSTAT register:
  * VFGEN_RSTAT on the VF
@@ -1069,8 +1069,8 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode,
 				err_msg_format = true;
 				break;
 			}
-			valid_len += ((qv->num_vectors - 1) *
-				sizeof(struct virtchnl_iwarp_qv_info));
+			valid_len += flex_array_size(qv, qv_info,
+						     qv->num_vectors);
 		}
 		break;
 	case VIRTCHNL_OP_CONFIG_RSS_KEY:
-- 
2.27.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [Intel-wired-lan] [PATCH][next] iavf: Replace one-element array in struct virtchnl_iwarp_qvlist_info and iavf_qvlist_info
  2021-05-25 23:04 [PATCH][next] iavf: Replace one-element array in struct virtchnl_iwarp_qvlist_info and iavf_qvlist_info Gustavo A. R. Silva
@ 2022-06-17 16:00 ` Gustavo A. R. Silva
  2022-06-21 20:40   ` Tony Nguyen
  0 siblings, 1 reply; 3+ messages in thread
From: Gustavo A. R. Silva @ 2022-06-17 16:00 UTC (permalink / raw)
  To: Gustavo A. R. Silva, Jesse Brandeburg, Tony Nguyen,
	David S. Miller, Jakub Kicinski
  Cc: intel-wired-lan, netdev, linux-kernel, linux-hardening

Hi all,

Friendly ping (after more than a year after I sent this patch :O):

Who can review and/or take this patch, please?

Thanks
--
Gustavo

On 5/26/21 01:04, Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare having a
> dynamically sized set of trailing elements in a structure. Kernel code
> should always use “flexible array members”[1] for these cases. The older
> style of one-element or zero-length arrays should no longer be used[2].
> 
> Refactor the code according to the use of a flexible-array member in struct
> virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element array,
> and use the flex_array_size() helper.
> 
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
> 
> Link: https://github.com/KSPP/linux/issues/79
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 2 +-
>   drivers/net/ethernet/intel/iavf/iavf_client.c      | 2 +-
>   drivers/net/ethernet/intel/iavf/iavf_client.h      | 2 +-
>   include/linux/avf/virtchnl.h                       | 8 ++++----
>   4 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index c0afac8cf33b..6c55fe9cc132 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -515,7 +515,7 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
>   
>   	kfree(vf->qvlist_info);
>   	vf->qvlist_info = kzalloc(struct_size(vf->qvlist_info, qv_info,
> -					      qvlist_info->num_vectors - 1),
> +					      qvlist_info->num_vectors),
>   				  GFP_KERNEL);
>   	if (!vf->qvlist_info) {
>   		ret = -ENOMEM;
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.c b/drivers/net/ethernet/intel/iavf/iavf_client.c
> index 0c77e4171808..e70da05ef322 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_client.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_client.c
> @@ -470,7 +470,7 @@ static int iavf_client_setup_qvlist(struct iavf_info *ldev,
>   
>   	v_qvlist_info = (struct virtchnl_iwarp_qvlist_info *)qvlist_info;
>   	msg_size = struct_size(v_qvlist_info, qv_info,
> -			       v_qvlist_info->num_vectors - 1);
> +			       v_qvlist_info->num_vectors);
>   
>   	adapter->client_pending |= BIT(VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP);
>   	err = iavf_aq_send_msg_to_pf(&adapter->hw,
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.h b/drivers/net/ethernet/intel/iavf/iavf_client.h
> index 9a7cf39ea75a..b14a82b65626 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_client.h
> +++ b/drivers/net/ethernet/intel/iavf/iavf_client.h
> @@ -53,7 +53,7 @@ struct iavf_qv_info {
>   
>   struct iavf_qvlist_info {
>   	u32 num_vectors;
> -	struct iavf_qv_info qv_info[1];
> +	struct iavf_qv_info qv_info[];
>   };
>   
>   #define IAVF_CLIENT_MSIX_ALL 0xFFFFFFFF
> diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h
> index 85a687bc6096..15b982911321 100644
> --- a/include/linux/avf/virtchnl.h
> +++ b/include/linux/avf/virtchnl.h
> @@ -658,10 +658,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_iwarp_qv_info);
>   
>   struct virtchnl_iwarp_qvlist_info {
>   	u32 num_vectors;
> -	struct virtchnl_iwarp_qv_info qv_info[1];
> +	struct virtchnl_iwarp_qv_info qv_info[];
>   };
>   
> -VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_iwarp_qvlist_info);
> +VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_iwarp_qvlist_info);
>   
>   /* VF reset states - these are written into the RSTAT register:
>    * VFGEN_RSTAT on the VF
> @@ -1069,8 +1069,8 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode,
>   				err_msg_format = true;
>   				break;
>   			}
> -			valid_len += ((qv->num_vectors - 1) *
> -				sizeof(struct virtchnl_iwarp_qv_info));
> +			valid_len += flex_array_size(qv, qv_info,
> +						     qv->num_vectors);
>   		}
>   		break;
>   	case VIRTCHNL_OP_CONFIG_RSS_KEY:

^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [Intel-wired-lan] [PATCH][next] iavf: Replace one-element array in struct virtchnl_iwarp_qvlist_info and iavf_qvlist_info
  2022-06-17 16:00 ` [Intel-wired-lan] " Gustavo A. R. Silva
@ 2022-06-21 20:40   ` Tony Nguyen
  0 siblings, 0 replies; 3+ messages in thread
From: Tony Nguyen @ 2022-06-21 20:40 UTC (permalink / raw)
  To: Gustavo A. R. Silva, Gustavo A. R. Silva, Jesse Brandeburg,
	David S. Miller, Jakub Kicinski
  Cc: intel-wired-lan, netdev, linux-kernel, linux-hardening



On 6/17/2022 9:00 AM, Gustavo A. R. Silva wrote:
> Hi all,
> 
> Friendly ping (after more than a year after I sent this patch :O):
> 
> Who can review and/or take this patch, please?

Hi Gustavo,

IIRC this could cause some issues with the expectations of the virtchnl 
structures [1] for compatibility. There was a direction that we were 
going to head to resolve this. Unfortunately, the person who, I believe, 
was going to make this change is out for a couple of weeks. I will ask 
around and see if I can get any updates on this work. Otherwise, I'll 
ask him when he returns.

Thanks,
Tony

[1] 
https://lore.kernel.org/intel-wired-lan/f2fe13346f1d44ee9047254a95914d00@intel.com/

> Thanks
> -- 
> Gustavo
> 
> On 5/26/21 01:04, Gustavo A. R. Silva wrote:
>> There is a regular need in the kernel to provide a way to declare 
>> having a
>> dynamically sized set of trailing elements in a structure. Kernel code
>> should always use “flexible array members”[1] for these cases. The older
>> style of one-element or zero-length arrays should no longer be used[2].
>>
>> Refactor the code according to the use of a flexible-array member in 
>> struct
>> virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element 
>> array,
>> and use the flex_array_size() helper.
>>
>> [1] https://en.wikipedia.org/wiki/Flexible_array_member
>> [2] 
>> https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays 
>>
>>
>> Link: https://github.com/KSPP/linux/issues/79
>> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
>

^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-06-21 20:40 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-25 23:04 [PATCH][next] iavf: Replace one-element array in struct virtchnl_iwarp_qvlist_info and iavf_qvlist_info Gustavo A. R. Silva
2022-06-17 16:00 ` [Intel-wired-lan] " Gustavo A. R. Silva
2022-06-21 20:40   ` Tony Nguyen

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).