fix(modern_bpf): avoid overflow reading sockaddr_storage

Signed-off-by: Roberto Scolaro <[email protected]>

driver/modern_bpf/helpers/store/auxmap_store_params.h

@@ -601,6 +601,9 @@ static __always_inline void auxmap__store_sockaddr_param(struct auxiliary_map *a
 		/* Map the user-provided address to a sockaddr_un. */
 		struct sockaddr_un *sockaddr_un = (struct sockaddr_un *)sockaddr;
 
+		if (addrlen == sizeof(struct __kernel_sockaddr_storage))
+			addrlen -= 1;
+
 		/* Starting at `sockaddr_un` we have the socket family and after it
 		 * the `sun_path`.
 		 *
@@ -620,6 +623,7 @@ static __always_inline void auxmap__store_sockaddr_param(struct auxiliary_map *a
 		{
 			/* This is an abstract socket address, we need to skip the initial `\0`. */
 			start_reading_point = (unsigned long)sockaddr_un->sun_path + 1;
+			addrlen -= 1;
 		}
 		else
 		{
@@ -631,7 +635,7 @@ static __always_inline void auxmap__store_sockaddr_param(struct auxiliary_map *a
 		 * - socket_unix_path (sun_path).
 		 */
 		push__u8(auxmap->data, &auxmap->payload_pos, socket_family_to_scap(socket_family));
-		uint16_t written_bytes = push__charbuf(auxmap->data, &auxmap->payload_pos, start_reading_point, MAX_UNIX_SOCKET_PATH, KERNEL);
+		uint16_t written_bytes = push__charbuf(auxmap->data, &auxmap->payload_pos, start_reading_point, addrlen, KERNEL);
 		final_param_len = FAMILY_SIZE + written_bytes;
 		break;
 	}