[libvirt] [PATCH 08/12] Add bounds checking on virConnectListAllInterfaces RPC call

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; The return values for the virConnectListAllInterfaces 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 | 13 +++++-------- 3 files changed, 19 insertions(+), 8 deletions(-) diff --git a/daemon/remote.c b/daemon/remote.c index b6501e0..871b0df 100644 --- a/daemon/remote.c +++ b/daemon/remote.c @@ -4256,6 +4256,13 @@ remoteDispatchConnectListAllInterfaces(virNetServerPtr server ATTRIBUTE_UNUSED, args->flags)) < 0) goto cleanup; + if (nifaces > REMOTE_INTERFACE_LIST_MAX) { + virReportError(VIR_ERR_RPC, + _("Too many interfaces '%d' for limit '%d'"), + nifaces, REMOTE_INTERFACE_LIST_MAX); + goto cleanup; + } + if (ifaces && nifaces) { if (VIR_ALLOC_N(ret->ifaces.ifaces_val, nifaces) < 0) goto cleanup; diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c index e555704..4d82452 100644 --- a/src/remote/remote_driver.c +++ b/src/remote/remote_driver.c @@ -2909,6 +2909,13 @@ remoteConnectListAllInterfaces(virConnectPtr conn, (char *) &ret) == -1) goto done; + if (ret.ifaces.ifaces_len > REMOTE_INTERFACE_LIST_MAX) { + virReportError(VIR_ERR_RPC, + _("Too many interfaces '%d' for limit '%d'"), + ret.ifaces.ifaces_len, REMOTE_INTERFACE_LIST_MAX); + goto cleanup; + } + if (ifaces) { if (VIR_ALLOC_N(tmp_ifaces, ret.ifaces.ifaces_len + 1) < 0) goto cleanup; diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x index f1e27fa..573d63f 100644 --- a/src/remote/remote_protocol.x +++ b/src/remote/remote_protocol.x @@ -91,11 +91,8 @@ const REMOTE_MIGRATE_COOKIE_MAX = 16384; /* Upper limit on lists of networks. */ const REMOTE_NETWORK_LIST_MAX = 16384; -/* Upper limit on lists of interface names. */ -const REMOTE_INTERFACE_NAME_LIST_MAX = 16384; - -/* Upper limit on lists of defined interface names. */ -const REMOTE_DEFINED_INTERFACE_NAME_LIST_MAX = 16384; +/* Upper limit on lists of interfaces. */ +const REMOTE_INTERFACE_LIST_MAX = 16384; /* Upper limit on lists of storage pools. */ const REMOTE_STORAGE_POOL_LIST_MAX = 4096; @@ -1478,7 +1475,7 @@ struct remote_connect_list_interfaces_args { }; struct remote_connect_list_interfaces_ret { - remote_nonnull_string names<REMOTE_INTERFACE_NAME_LIST_MAX>; /* insert@1 */ + remote_nonnull_string names<REMOTE_INTERFACE_LIST_MAX>; /* insert@1 */ }; struct remote_connect_num_of_defined_interfaces_ret { @@ -1490,7 +1487,7 @@ struct remote_connect_list_defined_interfaces_args { }; struct remote_connect_list_defined_interfaces_ret { - remote_nonnull_string names<REMOTE_DEFINED_INTERFACE_NAME_LIST_MAX>; /* insert@1 */ + remote_nonnull_string names<REMOTE_INTERFACE_LIST_MAX>; /* insert@1 */ }; struct remote_interface_lookup_by_name_args { @@ -2701,7 +2698,7 @@ struct remote_connect_list_all_interfaces_args { }; struct remote_connect_list_all_interfaces_ret { - remote_nonnull_interface ifaces<>; + remote_nonnull_interface ifaces<REMOTE_INTERFACE_LIST_MAX>; unsigned int ret; }; -- 1.8.3.1