جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: platform/chrome: sensorhub: Fix memory overread in ring handler `max_response` and `sensor_num` are read from different EC commands: - `max_response` is from cros_ec_get_proto_info(). ec_dev->max_response = info->max_response_packet_size - sizeof(struct ec_host_response); - `sensor_num` is from cros_ec_get_sensor_count(). sensor_num = cros_ec_get_sensor_count(ec); With a malfunctioning EC firmware, it is possible that the `msg->insize` (i.e., `fifo_info_length` in the context) could be clamped in cros_ec_cmd_xfer() because `msg->insize` is greater than `max_response`. int fifo_info_length = sizeof(struct ec_response_motion_sense_fifo_info) + sizeof(u16) * sensorhub->sensor_num; This means the number of read bytes could be less than expected. As a result, the subsequent memcpy() in cros_ec_sensorhub_ring_handler() overreads the `resp->fifo_info` buffer. Check the return value of cros_ec_cmd_xfer_status() and abort if the number of bytes read does not match the expected length.

• https://git.kernel.org/stable/c/98604cc8fd2578442f49cd113481e8fc83bc0ad3
• https://git.kernel.org/stable/c/86bcfab7dff6f0a61cbe0660e5176e907353141b
• https://git.kernel.org/stable/c/7e901aaf95828364b05a2120a1bea1a1669bdc9a
• https://git.kernel.org/stable/c/7780d93ae28f31fe517417c9451255315d1ad584
• https://git.kernel.org/stable/c/ee0403520cdbcf87e853df9aaa9b518a0684ed38
• https://git.kernel.org/stable/c/847a5ba0ac75f609e3f88da905251f7a76179145
• https://git.kernel.org/stable/c/6268f46d83875d294d75b68b97a5b79953744598
• https://git.kernel.org/stable/c/d1ceb2b2324717fa30b44d56ef0c52813e239569