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conf: Don't crash on invalid chardev source definition of RNGs and other 

Since commit 297c99a5 an invalid source definition XML of a character
device that is used as backend for RNG devices, smartcards and redirdevs
causes crash of the daemon when parsing such a definition.

The device types mentioned above are not a part of a regular character
device but are backends for other types. Thus when parsing such device
NULL is passed as the argument @chr_def. Later when checking the
validity of the definition @chr_def was dereferenced when parsing a UNIX
socket backend with missing path of the socket and crashed the daemon.

Sample offending configuration:
  <devices>
  ...
    <rng model='virtio'>
      <backend model='egd' type='unix'>
        <source mode='bind' service='1024'/>
      </backend>
    </rng>
  </devices>

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1012196
This commit is contained in:
Peter Krempa 2013-09-26 08:12:39 +02:00
parent e23216da9a
commit 795527548f
3 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/conf/domain_conf.c
View File

@ -7070,7 +7070,8 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
case VIR_DOMAIN_CHR_TYPE_UNIX:
/* path can be auto generated */
if (!path &&
chr_def->targetType != VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_VIRTIO) {
(!chr_def ||
chr_def->targetType != VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_VIRTIO)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Missing source path attribute for char device"));
goto error;

27
tests/qemuxml2argvdata/qemuxml2argv-virtio-rng-egd-crash.xml Normal file
View File

@ -0,0 +1,27 @@
<domain type='qemu'>
<name>QEMUGuest1</name>
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
<memory unit='KiB'>219100</memory>
<currentMemory unit='KiB'>219100</currentMemory>
<vcpu placement='static' cpuset='1-4,8-20,525'>1</vcpu>
<os>
<type arch='i686' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu</emulator>
<controller type='usb' index='0'/>
<controller type='pci' index='0' model='pci-root'/>
<memballoon model='virtio'/>
<rng model='virtio'>
<backend model='egd' type='unix'>
<!-- https://bugzilla.redhat.com/show_bug.cgi?id=1012196 -->
<source mode='connect' host='1.2.3.4' service='1234'/>
</backend>
</rng>
</devices>
</domain>

2
tests/qemuxml2argvtest.c
View File

@ -986,6 +986,8 @@ mymain(void)
QEMU_CAPS_OBJECT_RNG_RANDOM);
DO_TEST("virtio-rng-egd", QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_VIRTIO_RNG,
QEMU_CAPS_OBJECT_RNG_EGD);
DO_TEST_PARSE_ERROR("virtio-rng-egd-crash", QEMU_CAPS_DEVICE,
QEMU_CAPS_DEVICE_VIRTIO_RNG, QEMU_CAPS_OBJECT_RNG_EGD);
DO_TEST("virtio-rng-ccw",
QEMU_CAPS_DEVICE, QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG,
QEMU_CAPS_DRIVE, QEMU_CAPS_BOOTINDEX, QEMU_CAPS_VIRTIO_CCW,