[Qemu-devel] [PATCH 4/4] Warning messages on net devices hotplug

[Eduardo Otubo <otubo@linux.vnet.ibm.com>]

With the inclusion of the new "double whitelist" seccomp filter, Qemu
won't be able to execve() in runtime, thus, no hotplug net devices
allowed.

Signed-off-by: Eduardo Otubo <otubo@linux.vnet.ibm.com>
---
 hmp.c |  6 ++++++
 net.c | 13 +++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/hmp.c b/hmp.c
index 70bdec2..f258338 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1091,6 +1091,12 @@ void hmp_netdev_add(Monitor *mon, const QDict *qdict)
     Error *err = NULL;
     QemuOpts *opts;
 
+#ifdef CONFIG_SECCOMP
+    error_set(&err, ERROR_CLASS_GENERIC_ERROR,
+            "Cannot hotplug TAP device when -sandbox is in effect");
+    goto out;
+#endif
+
     opts = qemu_opts_from_qdict(qemu_find_opts("netdev"), qdict, &err);
     if (error_is_set(&err)) {
         goto out;
diff --git a/net.c b/net.c
index ae4bc0d..a652ee9 100644
--- a/net.c
+++ b/net.c
@@ -752,6 +752,12 @@ void net_host_device_add(Monitor *mon, const QDict *qdict)
     Error *local_err = NULL;
     QemuOpts *opts;
 
+#ifdef CONFIG_SECCOMP
+    error_set(&local_err, ERROR_CLASS_GENERIC_ERROR,
+            "Cannot hotplug TAP device when -sandbox is in effect");
+    goto out;
+#endif
+
     if (!net_host_check_device(device)) {
         monitor_printf(mon, "invalid host network device %s\n", device);
         return;
@@ -765,6 +771,7 @@ void net_host_device_add(Monitor *mon, const QDict *qdict)
     qemu_opt_set(opts, "type", device);
 
     net_client_init(opts, 0, &local_err);
+out:
     if (error_is_set(&local_err)) {
         qerror_report_err(local_err);
         error_free(local_err);
@@ -800,6 +807,12 @@ int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
     QemuOptsList *opts_list;
     QemuOpts *opts;
 
+#ifdef CONFIG_SECCOMP
+    error_set(&local_err, ERROR_CLASS_GENERIC_ERROR,
+            "Cannot hotplug TAP device when -sandbox is in effect");
+    goto exit_err;
+#endif
+
     opts_list = qemu_find_opts_err("netdev", &local_err);
     if (error_is_set(&local_err)) {
         goto exit_err;
-- 
1.7.12