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authorPierre Morel <pmorel@linux.ibm.com>2021-04-08 18:32:09 +0200
committerCornelia Huck <cohuck@redhat.com>2021-04-09 10:52:13 +0200
commitd895d25ae2bb8519aa715dd2a97f09d4a66b189d (patch)
tree9f4fd5f816733abef00401752f049af92c0da713
parentd8724020dd13c88a72fc391a6a2cf63abbd3dcca (diff)
downloadqemu-arm-d895d25ae2bb8519aa715dd2a97f09d4a66b189d.tar.gz
s390x: css: report errors from ccw_dstream_read/write
ccw_dstream_read/write functions returned values are sometime not taking into account and reported back to the upper level of interpretation of CCW instructions. It follows that accessing an invalid address does not trigger a subchannel status program check to the guest as it should. Let's test the return values of ccw_dstream_write[_buf] and ccw_dstream_read[_buf] and report it to the caller. Cc: qemu-stable@nongnu.org Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> Acked-by: Halil Pasic <pasic@linux.ibm.com> Message-Id: <1617899529-9329-2-git-send-email-pmorel@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
-rw-r--r--hw/char/terminal3270.c11
-rw-r--r--hw/s390x/3270-ccw.c5
-rw-r--r--hw/s390x/css.c14
-rw-r--r--hw/s390x/virtio-ccw.c66
4 files changed, 69 insertions, 27 deletions
diff --git a/hw/char/terminal3270.c b/hw/char/terminal3270.c
index a9a46c8ed3..82e85fac2e 100644
--- a/hw/char/terminal3270.c
+++ b/hw/char/terminal3270.c
@@ -200,9 +200,13 @@ static int read_payload_3270(EmulatedCcw3270Device *dev)
{
Terminal3270 *t = TERMINAL_3270(dev);
int len;
+ int ret;
len = MIN(ccw_dstream_avail(get_cds(t)), t->in_len);
- ccw_dstream_write_buf(get_cds(t), t->inv, len);
+ ret = ccw_dstream_write_buf(get_cds(t), t->inv, len);
+ if (ret < 0) {
+ return ret;
+ }
t->in_len -= len;
return len;
@@ -260,7 +264,10 @@ static int write_payload_3270(EmulatedCcw3270Device *dev, uint8_t cmd)
t->outv[out_len++] = cmd;
do {
- ccw_dstream_read_buf(get_cds(t), &t->outv[out_len], len);
+ retval = ccw_dstream_read_buf(get_cds(t), &t->outv[out_len], len);
+ if (retval < 0) {
+ return retval;
+ }
count = ccw_dstream_avail(get_cds(t));
out_len += len;
diff --git a/hw/s390x/3270-ccw.c b/hw/s390x/3270-ccw.c
index 821319eee6..f3e7342b1e 100644
--- a/hw/s390x/3270-ccw.c
+++ b/hw/s390x/3270-ccw.c
@@ -31,6 +31,9 @@ static int handle_payload_3270_read(EmulatedCcw3270Device *dev, CCW1 *ccw)
}
len = ck->read_payload_3270(dev);
+ if (len < 0) {
+ return len;
+ }
ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
return 0;
@@ -50,7 +53,7 @@ static int handle_payload_3270_write(EmulatedCcw3270Device *dev, CCW1 *ccw)
len = ck->write_payload_3270(dev, ccw->cmd_code);
if (len <= 0) {
- return -EIO;
+ return len ? len : -EIO;
}
ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index fe47751df4..4149b8e5a7 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1055,10 +1055,11 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
}
}
len = MIN(ccw.count, sizeof(sch->sense_data));
- ccw_dstream_write_buf(&sch->cds, sch->sense_data, len);
+ ret = ccw_dstream_write_buf(&sch->cds, sch->sense_data, len);
sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
- memset(sch->sense_data, 0, sizeof(sch->sense_data));
- ret = 0;
+ if (!ret) {
+ memset(sch->sense_data, 0, sizeof(sch->sense_data));
+ }
break;
case CCW_CMD_SENSE_ID:
{
@@ -1083,9 +1084,10 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
} else {
sense_id[0] = 0;
}
- ccw_dstream_write_buf(&sch->cds, sense_id, len);
- sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
- ret = 0;
+ ret = ccw_dstream_write_buf(&sch->cds, sense_id, len);
+ if (!ret) {
+ sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
+ }
break;
}
case CCW_CMD_TIC:
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 314ed7b245..8195f3546e 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -288,14 +288,20 @@ static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len,
return -EFAULT;
}
if (is_legacy) {
- ccw_dstream_read(&sch->cds, linfo);
+ ret = ccw_dstream_read(&sch->cds, linfo);
+ if (ret) {
+ return ret;
+ }
linfo.queue = be64_to_cpu(linfo.queue);
linfo.align = be32_to_cpu(linfo.align);
linfo.index = be16_to_cpu(linfo.index);
linfo.num = be16_to_cpu(linfo.num);
ret = virtio_ccw_set_vqs(sch, NULL, &linfo);
} else {
- ccw_dstream_read(&sch->cds, info);
+ ret = ccw_dstream_read(&sch->cds, info);
+ if (ret) {
+ return ret;
+ }
info.desc = be64_to_cpu(info.desc);
info.index = be16_to_cpu(info.index);
info.num = be16_to_cpu(info.num);
@@ -371,7 +377,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
ccw_dstream_advance(&sch->cds, sizeof(features.features));
- ccw_dstream_read(&sch->cds, features.index);
+ ret = ccw_dstream_read(&sch->cds, features.index);
+ if (ret) {
+ break;
+ }
if (features.index == 0) {
if (dev->revision >= 1) {
/* Don't offer legacy features for modern devices. */
@@ -392,9 +401,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
}
ccw_dstream_rewind(&sch->cds);
features.features = cpu_to_le32(features.features);
- ccw_dstream_write(&sch->cds, features.features);
- sch->curr_status.scsw.count = ccw.count - sizeof(features);
- ret = 0;
+ ret = ccw_dstream_write(&sch->cds, features.features);
+ if (!ret) {
+ sch->curr_status.scsw.count = ccw.count - sizeof(features);
+ }
}
break;
case CCW_CMD_WRITE_FEAT:
@@ -411,7 +421,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
if (!ccw.cda) {
ret = -EFAULT;
} else {
- ccw_dstream_read(&sch->cds, features);
+ ret = ccw_dstream_read(&sch->cds, features);
+ if (ret) {
+ break;
+ }
features.features = le32_to_cpu(features.features);
if (features.index == 0) {
virtio_set_features(vdev,
@@ -454,9 +467,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
ret = -EFAULT;
} else {
virtio_bus_get_vdev_config(&dev->bus, vdev->config);
- ccw_dstream_write_buf(&sch->cds, vdev->config, len);
- sch->curr_status.scsw.count = ccw.count - len;
- ret = 0;
+ ret = ccw_dstream_write_buf(&sch->cds, vdev->config, len);
+ if (ret) {
+ sch->curr_status.scsw.count = ccw.count - len;
+ }
}
break;
case CCW_CMD_WRITE_CONF:
@@ -511,7 +525,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
if (!ccw.cda) {
ret = -EFAULT;
} else {
- ccw_dstream_read(&sch->cds, status);
+ ret = ccw_dstream_read(&sch->cds, status);
+ if (ret) {
+ break;
+ }
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
virtio_ccw_stop_ioeventfd(dev);
}
@@ -554,7 +571,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
if (!ccw.cda) {
ret = -EFAULT;
} else {
- ccw_dstream_read(&sch->cds, indicators);
+ ret = ccw_dstream_read(&sch->cds, indicators);
+ if (ret) {
+ break;
+ }
indicators = be64_to_cpu(indicators);
dev->indicators = get_indicator(indicators, sizeof(uint64_t));
sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
@@ -575,7 +595,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
if (!ccw.cda) {
ret = -EFAULT;
} else {
- ccw_dstream_read(&sch->cds, indicators);
+ ret = ccw_dstream_read(&sch->cds, indicators);
+ if (ret) {
+ break;
+ }
indicators = be64_to_cpu(indicators);
dev->indicators2 = get_indicator(indicators, sizeof(uint64_t));
sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
@@ -596,7 +619,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
if (!ccw.cda) {
ret = -EFAULT;
} else {
- ccw_dstream_read(&sch->cds, vq_config.index);
+ ret = ccw_dstream_read(&sch->cds, vq_config.index);
+ if (ret) {
+ break;
+ }
vq_config.index = be16_to_cpu(vq_config.index);
if (vq_config.index >= VIRTIO_QUEUE_MAX) {
ret = -EINVAL;
@@ -605,9 +631,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
vq_config.num_max = virtio_queue_get_num(vdev,
vq_config.index);
vq_config.num_max = cpu_to_be16(vq_config.num_max);
- ccw_dstream_write(&sch->cds, vq_config.num_max);
- sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
- ret = 0;
+ ret = ccw_dstream_write(&sch->cds, vq_config.num_max);
+ if (!ret) {
+ sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
+ }
}
break;
case CCW_CMD_SET_IND_ADAPTER:
@@ -664,7 +691,10 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
ret = -EFAULT;
break;
}
- ccw_dstream_read_buf(&sch->cds, &revinfo, 4);
+ ret = ccw_dstream_read_buf(&sch->cds, &revinfo, 4);
+ if (ret < 0) {
+ break;
+ }
revinfo.revision = be16_to_cpu(revinfo.revision);
revinfo.length = be16_to_cpu(revinfo.length);
if (ccw.count < len + revinfo.length ||