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firmware: arm_scmi: Harden accesses to the sensor domains 

Accessing sensor domains descriptors by the index upon the SCMI drivers
requests through the SCMI sensor operations interface can potentially
lead to out-of-bound violations if the SCMI driver misbehave.

Add an internal consistency check before any such domains descriptors
accesses.

Link: https://lore.kernel.org/r/20220817172731.1185305-4-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2022-08-17 18:27:28 +01:00 committed by Sudeep Holla
parent 1ecb7d27b1
commit 76f89c9547
1 changed files with 18 additions and 4 deletions
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22
drivers/firmware/arm_scmi/sensors.c
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@ -762,6 +762,10 @@ static int scmi_sensor_config_get(const struct scmi_protocol_handle *ph,
{
int ret;
struct scmi_xfer *t;
struct sensors_info *si = ph->get_priv(ph);
if (sensor_id >= si->num_sensors)
return -EINVAL;
ret = ph->xops->xfer_get_init(ph, SENSOR_CONFIG_GET,
sizeof(__le32), sizeof(__le32), &t);
@ -771,7 +775,6 @@ static int scmi_sensor_config_get(const struct scmi_protocol_handle *ph,
put_unaligned_le32(sensor_id, t->tx.buf);
ret = ph->xops->do_xfer(ph, t);
if (!ret) {
struct sensors_info *si = ph->get_priv(ph);
struct scmi_sensor_info *s = si->sensors + sensor_id;
*sensor_config = get_unaligned_le64(t->rx.buf);
@ -788,6 +791,10 @@ static int scmi_sensor_config_set(const struct scmi_protocol_handle *ph,
int ret;
struct scmi_xfer *t;
struct scmi_msg_sensor_config_set *msg;
struct sensors_info *si = ph->get_priv(ph);
if (sensor_id >= si->num_sensors)
return -EINVAL;
ret = ph->xops->xfer_get_init(ph, SENSOR_CONFIG_SET,
sizeof(*msg), 0, &t);
@ -800,7 +807,6 @@ static int scmi_sensor_config_set(const struct scmi_protocol_handle *ph,
ret = ph->xops->do_xfer(ph, t);
if (!ret) {
struct sensors_info *si = ph->get_priv(ph);
struct scmi_sensor_info *s = si->sensors + sensor_id;
s->sensor_config = sensor_config;
@ -831,8 +837,11 @@ static int scmi_sensor_reading_get(const struct scmi_protocol_handle *ph,
int ret;
struct scmi_xfer *t;
struct scmi_msg_sensor_reading_get *sensor;
struct scmi_sensor_info *s;
struct sensors_info *si = ph->get_priv(ph);
struct scmi_sensor_info *s = si->sensors + sensor_id;
if (sensor_id >= si->num_sensors)
return -EINVAL;
ret = ph->xops->xfer_get_init(ph, SENSOR_READING_GET,
sizeof(*sensor), 0, &t);
@ -841,6 +850,7 @@ static int scmi_sensor_reading_get(const struct scmi_protocol_handle *ph,
sensor = t->tx.buf;
sensor->id = cpu_to_le32(sensor_id);
s = si->sensors + sensor_id;
if (s->async) {
sensor->flags = cpu_to_le32(SENSOR_READ_ASYNC);
ret = ph->xops->do_xfer_with_response(ph, t);
@ -895,9 +905,13 @@ scmi_sensor_reading_get_timestamped(const struct scmi_protocol_handle *ph,
int ret;
struct scmi_xfer *t;
struct scmi_msg_sensor_reading_get *sensor;
struct scmi_sensor_info *s;
struct sensors_info *si = ph->get_priv(ph);
struct scmi_sensor_info *s = si->sensors + sensor_id;
if (sensor_id >= si->num_sensors)
return -EINVAL;
s = si->sensors + sensor_id;
if (!count || !readings ||
(!s->num_axis && count > 1) || (s->num_axis && count > s->num_axis))
return -EINVAL;