>
> Receives the GraphicsDeviceInfo message from the streaming agent and
> stores the data in a list on the streaming device.
>
> Signed-off-by: Lukáš Hrázký <lhra...@redhat.com>
> ---
> server/display-limits.h | 3 ++
> server/red-qxl.c | 2 +-
> server/red-stream-device.c | 67 ++++++++++++++++++++++++++++++++++++--
> server/red-stream-device.h | 8 +++++
> server/reds.c | 1 +
> 5 files changed, 78 insertions(+), 3 deletions(-)
>
> diff --git a/server/display-limits.h b/server/display-limits.h
> index e875149b..d79d3211 100644
> --- a/server/display-limits.h
> +++ b/server/display-limits.h
> @@ -25,4 +25,7 @@
> /** Maximum number of streams created by spice-server */
> #define NUM_STREAMS 50
>
> +/** Maximum length of the device address string */
> +#define MAX_DEVICE_ADDRESS_LEN 256
> +
> #endif /* DISPLAY_LIMITS_H_ */
> diff --git a/server/red-qxl.c b/server/red-qxl.c
> index a56d9a52..943ccb08 100644
> --- a/server/red-qxl.c
> +++ b/server/red-qxl.c
> @@ -37,11 +37,11 @@
> #include "dispatcher.h"
> #include "red-parse-qxl.h"
> #include "red-channel-client.h"
> +#include "display-limits.h"
>
> #include "red-qxl.h"
>
>
> -#define MAX_DEVICE_ADDRESS_LEN 256
> #define MAX_MONITORS_COUNT 16
>
> struct QXLState {
> diff --git a/server/red-stream-device.c b/server/red-stream-device.c
> index 215ddbe7..20bf115d 100644
> --- a/server/red-stream-device.c
> +++ b/server/red-stream-device.c
> @@ -37,6 +37,7 @@ struct StreamDevice {
> StreamMsgCapabilities capabilities;
> StreamMsgCursorSet cursor_set;
> StreamMsgCursorMove cursor_move;
> + StreamMsgDeviceDisplayInfo device_display_info;
> uint8_t buf[STREAM_MSG_CAPABILITIES_MAX_BYTES];
> } *msg;
> uint32_t msg_pos;
> @@ -49,6 +50,7 @@ struct StreamDevice {
> CursorChannel *cursor_channel;
> SpiceTimer *close_timer;
> uint32_t frame_mmtime;
> + StreamDeviceDisplayInfo device_display_info;
> };
>
> struct StreamDeviceClass {
> @@ -64,8 +66,8 @@ static void char_device_set_state(RedCharDevice *char_dev,
> int state);
> typedef bool StreamMsgHandler(StreamDevice *dev, SpiceCharDeviceInstance
> *sin)
> SPICE_GNUC_WARN_UNUSED_RESULT;
>
> -static StreamMsgHandler handle_msg_format, handle_msg_data,
> handle_msg_cursor_set,
> - handle_msg_cursor_move, handle_msg_capabilities;
> +static StreamMsgHandler handle_msg_format, handle_msg_device_display_info,
> handle_msg_data,
> + handle_msg_cursor_set, handle_msg_cursor_move, handle_msg_capabilities;
>
> static bool handle_msg_invalid(StreamDevice *dev, SpiceCharDeviceInstance
> *sin,
> const char *error_msg)
> SPICE_GNUC_WARN_UNUSED_RESULT;
> @@ -146,6 +148,13 @@ stream_device_partial_read(StreamDevice *dev,
> SpiceCharDeviceInstance *sin)
> handled = handle_msg_format(dev, sin);
> }
> break;
> + case STREAM_TYPE_DEVICE_DISPLAY_INFO:
> + if (dev->hdr.size > sizeof(StreamMsgDeviceDisplayInfo) +
> MAX_DEVICE_ADDRESS_LEN) {
> + handled = handle_msg_invalid(dev, sin,
> "StreamMsgDeviceDisplayInfo too large");
> + } else {
> + handled = handle_msg_device_display_info(dev, sin);
> + }
> + break;
> case STREAM_TYPE_DATA:
> if (dev->hdr.size > 32*1024*1024) {
> handled = handle_msg_invalid(dev, sin, "STREAM_DATA too large");
> @@ -271,6 +280,60 @@ handle_msg_format(StreamDevice *dev,
> SpiceCharDeviceInstance *sin)
> return true;
> }
>
> +static bool
> +handle_msg_device_display_info(StreamDevice *dev, SpiceCharDeviceInstance
> *sin)
> +{
> + SpiceCharDeviceInterface *sif = spice_char_device_get_interface(sin);
> +
> + if (spice_extra_checks) {
> + spice_assert(dev->hdr_pos >= sizeof(StreamDevHeader));
> + spice_assert(dev->hdr.type == STREAM_TYPE_DEVICE_DISPLAY_INFO);
> + }
> +
> + if (dev->msg_len < dev->hdr.size) {
> + dev->msg = g_realloc(dev->msg, dev->hdr.size);
> + dev->msg_len = dev->hdr.size;
> + }
> +
> + /* read from device */
> + ssize_t n = sif->read(sin, dev->msg->buf + dev->msg_pos, dev->hdr.size -
> dev->msg_pos);
> + if (n <= 0) {
> + return dev->msg_pos == dev->hdr.size;
> + }
> +
> + dev->msg_pos += n;
> + if (dev->msg_pos != dev->hdr.size) { /* some bytes are still missing */
> + return false;
> + }
> +
> + StreamMsgDeviceDisplayInfo *display_info_msg =
> &dev->msg->device_display_info;
> +
> + size_t device_address_len =
> GUINT32_FROM_LE(display_info_msg->device_address_len);
> + if (device_address_len > MAX_DEVICE_ADDRESS_LEN) {
> + g_error("Received a device address longer than %u (%zu), "
> + "will be truncated!", MAX_DEVICE_ADDRESS_LEN,
> device_address_len);
DoS, g_error will abort() Qemu.
> + device_address_len =
> sizeof(dev->device_display_info.device_address);
> + }
> +
> + strncpy(dev->device_display_info.device_address,
> + (char*) display_info_msg->device_address,
> + device_address_len);
buffer overflow reading, is not guaranteed that the address
fit in the message, you need to check it.
> +
> + // make sure the string is terminated
> + dev->device_display_info.device_address[device_address_len - 1] = '\0';
> +
buffer overflow writing if devide_address_len is 0, also device_address won't
be terminated causing a future buffer overflow reading.
> + dev->device_display_info.stream_id =
> GUINT32_FROM_LE(display_info_msg->stream_id);
> + dev->device_display_info.device_display_id =
> GUINT32_FROM_LE(display_info_msg->device_display_id);
> +
> + g_debug("Received DeviceDisplayInfo from the streaming agent: stream_id
> %u, "
> + "device_address %s, device_display_id %u",
> + dev->device_display_info.stream_id,
> + dev->device_display_info.device_address,
> + dev->device_display_info.device_display_id);
> +
> + return true;
> +}
> +
> static bool
> handle_msg_capabilities(StreamDevice *dev, SpiceCharDeviceInstance *sin)
> {
> diff --git a/server/red-stream-device.h b/server/red-stream-device.h
> index f0a5b5c1..996be016 100644
> --- a/server/red-stream-device.h
> +++ b/server/red-stream-device.h
> @@ -19,6 +19,7 @@
> #ifndef STREAM_DEVICE_H
> #define STREAM_DEVICE_H
>
> +#include "display-limits.h"
> #include "char-device.h"
>
> G_BEGIN_DECLS
> @@ -41,6 +42,13 @@ typedef struct StreamDeviceClass StreamDeviceClass;
> (G_TYPE_INSTANCE_GET_CLASS((obj), TYPE_STREAM_DEVICE,
> StreamDeviceClass))
>
> GType stream_device_get_type(void) G_GNUC_CONST;
> +
> +typedef struct StreamDeviceDisplayInfo {
> + uint32_t stream_id;
> + char device_address[MAX_DEVICE_ADDRESS_LEN];
> + uint32_t device_display_id;
> +} StreamDeviceDisplayInfo;
> +
> StreamDevice *stream_device_connect(RedsState *reds, SpiceCharDeviceInstance
> *sin);
>
> /* Create channel for the streaming device.
> diff --git a/server/reds.c b/server/reds.c
> index 88a82419..48796ba6 100644
> --- a/server/reds.c
> +++ b/server/reds.c
> @@ -74,6 +74,7 @@
> #include "glib-compat.h"
> #include "net-utils.h"
> #include "red-stream-device.h"
> +#include "display-limits.h"
This should not be necessary.
>
> #define REDS_MAX_STAT_NODES 100
>
Frediano
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