linux-hardening - Re: [PATCH v2][next] wifi: wil6210: Annotate a couple of structs with __counted

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Date: Wed, 27 Mar 2024 12:53:35 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2][next] wifi: wil6210: Annotate a couple of structs with
 __counted_by()

Hi all,

Please, drop this.

The following patches replaces it:

https://lore.kernel.org/linux-hardening/ZgRqjGShTl3y5FFB@neat/

Thanks
--
Gustavo

On 3/27/24 11:43, Gustavo A. R. Silva wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
> Changes in v2:
>   - Annotate one more struct.
>   - Update Subject line.
> 
> v1:
>   - Link: https://lore.kernel.org/linux-hardening/ZgODZOB4fOBvKl7R@neat/
> 
>   drivers/net/wireless/ath/wil6210/wmi.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/wil6210/wmi.h b/drivers/net/wireless/ath/wil6210/wmi.h
> index 71bf2ae27a98..38f64524019e 100644
> --- a/drivers/net/wireless/ath/wil6210/wmi.h
> +++ b/drivers/net/wireless/ath/wil6210/wmi.h
> @@ -474,7 +474,7 @@ struct wmi_start_scan_cmd {
>   	struct {
>   		u8 channel;
>   		u8 reserved;
> -	} channel_list[];
> +	} channel_list[] __counted_by(num_channels);
>   } __packed;
>   
>   #define WMI_MAX_PNO_SSID_NUM	(16)
> @@ -3320,7 +3320,7 @@ struct wmi_set_link_monitor_cmd {
>   	u8 rssi_hyst;
>   	u8 reserved[12];
>   	u8 rssi_thresholds_list_size;
> -	s8 rssi_thresholds_list[];
> +	s8 rssi_thresholds_list[] __counted_by(rssi_thresholds_list_size);
>   } __packed;
>   
>   /* wmi_link_monitor_event_type */