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

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Date: Wed, 27 Mar 2024 11:43:38 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH v2][next] wifi: wil6210: Annotate a couple of structs with
 __counted_by()

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 */
-- 
2.34.1