libxl_conf: Fix config generation for multiple serial devices

Currently, an array of libxl_string_list (char **) or in other words,
a triple char pointer is initialized. This is dereferenced to a char ** type
and stored in serial_list, which is NULL at this point. There is an attempt to
reference an element of this serial_list when making a call to
libxlMakeChrdevStr which causes a segmentation fault.

To fix this, we simply allocate an array of char * instead of
libxl_string_list.

This patch also adds testcases to extend coverage over both single serial and
multiple serial cases.

Signed-off-by: Rayhan Faizel <rayhan.faizel@gmail.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>

src/libxl/libxl_conf.c

@@ -692,7 +692,7 @@ libxlMakeDomBuildInfo(virDomainDef *def,
                     0)
                     return -1;
             } else {
-                b_info->u.hvm.serial_list = *g_new0(libxl_string_list, def->nserials + 1);
+                b_info->u.hvm.serial_list = g_new0(char *, def->nserials + 1);
                 for (i = 0; i < def->nserials; i++) {
                     if (libxlMakeChrdevStr(def->serials[i],
                                            &b_info->u.hvm.serial_list[i]) < 0)

tests/libxlxml2domconfigdata/multiple-serial.json

@@ -0,0 +1,63 @@
+{
+    "c_info": {
+        "type": "hvm",
+        "name": "test-hvm",
+        "uuid": "2147d599-9cc6-c0dc-92ab-4064b5446e9b"
+    },
+    "b_info": {
+        "max_vcpus": 4,
+        "avail_vcpus": [
+            0,
+            1,
+            2,
+            3
+        ],
+        "max_memkb": 1048576,
+        "target_memkb": 1048576,
+        "shadow_memkb": 1234,
+        "sched_params": {
+
+        },
+        "acpi": "True",
+        "apic": "True",
+        "type.hvm": {
+            "pae": "True",
+            "nographic": "True",
+            "vga": {
+                "kind": "none"
+            },
+            "vnc": {
+                "enable": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            },
+            "spice": {
+
+            },
+            "serial_list": [
+                "null",
+                "stdio",
+                "vc",
+                "pty",
+                "pipe:/tmp/file",
+                "file:/tmp/serial.log",
+                "/dev/ttyS2",
+                "udp::9999@:0",
+                "tcp:127.0.0.1:9999",
+                "unix:/tmp/serial-server.sock,server,nowait"
+            ],
+            "boot": "c",
+            "rdm": {
+
+            }
+        },
+        "arch_arm": {
+
+        },
+        "arch_x86": {
+
+        }
+    },
+    "on_reboot": "restart"
+}

tests/libxlxml2domconfigdata/multiple-serial.xml

@@ -0,0 +1,47 @@
+<domain type='xen'>
+  <name>test-hvm</name>
+  <description>None</description>
+  <uuid>2147d599-9cc6-c0dc-92ab-4064b5446e9b</uuid>
+  <memory>1048576</memory>
+  <currentMemory>1048576</currentMemory>
+  <vcpu>4</vcpu>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <clock offset='utc'/>
+  <os>
+    <type>hvm</type>
+    <loader>/usr/lib/xen/boot/hvmloader</loader>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <apic/>
+    <acpi/>
+    <pae/>
+  </features>
+  <devices>
+    <serial type='null'/>
+    <serial type='stdio'/>
+    <serial type='vc'/>
+    <serial type='pty'/>
+    <serial type='pipe'>
+      <source path='/tmp/file'/>
+    </serial>
+    <serial type='file'>
+      <source path='/tmp/serial.log'/>
+    </serial>
+    <serial type='dev'>
+      <source path='/dev/ttyS2'/>
+    </serial>
+    <serial type='udp'>
+      <source mode='connect' service='9999'/>
+    </serial>
+    <serial type='tcp'>
+      <source mode='connect' host='127.0.0.1' service='9999'/>
+      <protocol type='raw'/>
+    </serial>
+    <serial type='unix'>
+      <source mode='bind' path='/tmp/serial-server.sock'/>
+    </serial>
+  </devices>
+</domain>

tests/libxlxml2domconfigdata/single-serial.json

@@ -0,0 +1,52 @@
+{
+    "c_info": {
+        "type": "hvm",
+        "name": "test-hvm",
+        "uuid": "2147d599-9cc6-c0dc-92ab-4064b5446e9b"
+    },
+    "b_info": {
+        "max_vcpus": 4,
+        "avail_vcpus": [
+            0,
+            1,
+            2,
+            3
+        ],
+        "max_memkb": 1048576,
+        "target_memkb": 1048576,
+        "shadow_memkb": 1234,
+        "sched_params": {
+
+        },
+        "acpi": "True",
+        "apic": "True",
+        "type.hvm": {
+            "pae": "True",
+            "nographic": "True",
+            "vga": {
+                "kind": "none"
+            },
+            "vnc": {
+                "enable": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            },
+            "spice": {
+
+            },
+            "serial": "pty",
+            "boot": "c",
+            "rdm": {
+
+            }
+        },
+        "arch_arm": {
+
+        },
+        "arch_x86": {
+
+        }
+    },
+    "on_reboot": "restart"
+}

tests/libxlxml2domconfigdata/single-serial.xml

@@ -0,0 +1,25 @@
+<domain type='xen'>
+  <name>test-hvm</name>
+  <description>None</description>
+  <uuid>2147d599-9cc6-c0dc-92ab-4064b5446e9b</uuid>
+  <memory>1048576</memory>
+  <currentMemory>1048576</currentMemory>
+  <vcpu>4</vcpu>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <clock offset='utc'/>
+  <os>
+    <type>hvm</type>
+    <loader>/usr/lib/xen/boot/hvmloader</loader>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <apic/>
+    <acpi/>
+    <pae/>
+  </features>
+  <devices>
+    <serial type='pty'/>
+  </devices>
+</domain>

tests/libxlxml2domconfigtest.c

@@ -208,6 +208,9 @@ mymain(void)
 
     DO_TEST("max-eventchannels-hvm");
 
+    DO_TEST("single-serial");
+    DO_TEST("multiple-serial");
+
     unlink("libxl-driver.log");
 
     testXLFreeDriver(driver);