[libvirt] [PATCH 09/12] Add bounds checking on virConnectListAllNodeDevices RPC call

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; The return values for the virConnectListAllNodeDevices call were not bounds checked. This is a robustness issue for clients if something where to cause corruption of the RPC stream data. Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; --- daemon/remote.c | 7 +++++++ src/remote/remote_driver.c | 7 +++++++ src/remote/remote_protocol.x | 8 ++++---- 3 files changed, 18 insertions(+), 4 deletions(-) diff --git a/daemon/remote.c b/daemon/remote.c index 871b0df..697aa58 100644 --- a/daemon/remote.c +++ b/daemon/remote.c @@ -4315,6 +4315,13 @@ remoteDispatchConnectListAllNodeDevices(virNetServerPtr server ATTRIBUTE_UNUSED, args->flags)) < 0) goto cleanup; + if (ndevices > REMOTE_NODE_DEVICE_LIST_MAX) { + virReportError(VIR_ERR_RPC, + _("Too many node devices '%d' for limit '%d'"), + ndevices, REMOTE_NODE_DEVICE_LIST_MAX); + goto cleanup; + } + if (devices && ndevices) { if (VIR_ALLOC_N(ret->devices.devices_val, ndevices) < 0) goto cleanup; diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c index 4d82452..b170a06 100644 --- a/src/remote/remote_driver.c +++ b/src/remote/remote_driver.c @@ -2975,6 +2975,13 @@ remoteConnectListAllNodeDevices(virConnectPtr conn, (char *) &ret) == -1) goto done; + if (ret.devices.devices_len > REMOTE_NODE_DEVICE_LIST_MAX) { + virReportError(VIR_ERR_RPC, + _("Too many node devices '%d' for limit '%d'"), + ret.devices.devices_len, REMOTE_NODE_DEVICE_LIST_MAX); + goto cleanup; + } + if (devices) { if (VIR_ALLOC_N(tmp_devices, ret.devices.devices_len + 1) < 0) goto cleanup; diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x index 573d63f..21059c8 100644 --- a/src/remote/remote_protocol.x +++ b/src/remote/remote_protocol.x @@ -100,8 +100,8 @@ const REMOTE_STORAGE_POOL_LIST_MAX = 4096; /* Upper limit on lists of storage vols. */ const REMOTE_STORAGE_VOL_LIST_MAX = 16384; -/* Upper limit on lists of node device names. */ -const REMOTE_NODE_DEVICE_NAME_LIST_MAX = 16384; +/* Upper limit on lists of node devices. */ +const REMOTE_NODE_DEVICE_LIST_MAX = 16384; /* Upper limit on lists of node device capabilities. */ const REMOTE_NODE_DEVICE_CAPS_LIST_MAX = 65536; @@ -1863,7 +1863,7 @@ struct remote_node_list_devices_args { }; struct remote_node_list_devices_ret { - remote_nonnull_string names<REMOTE_NODE_DEVICE_NAME_LIST_MAX>; /* insert@2 */ + remote_nonnull_string names<REMOTE_NODE_DEVICE_LIST_MAX>; /* insert@2 */ }; struct remote_node_device_lookup_by_name_args { @@ -2708,7 +2708,7 @@ struct remote_connect_list_all_node_devices_args { }; struct remote_connect_list_all_node_devices_ret { - remote_nonnull_node_device devices<>; + remote_nonnull_node_device devices<REMOTE_NODE_DEVICE_LIST_MAX>; unsigned int ret; }; -- 1.8.3.1