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Re: [libvirt] [PATCH] Forbid use of ':' in RBD pool names



On Wed, May 15, 2013 at 01:26:03AM +0800, Osier Yang wrote:
> On 13/05/13 21:18, Daniel Veillard wrote:
> >On Mon, May 13, 2013 at 02:00:31PM +0100, Daniel P. Berrange wrote:
> >>From: "Daniel P. Berrange" <berrange redhat com>
> >>
> >>The QEMU command line syntax for RBD disks is
> >>
> >>    file=rbd:pool/image:opt1=val1:opt2=val2...
> >>
> >>There is no way to escape the ':' if it appears in the
> >>pool or image name. Thus it must be explicitly forbidden
> >>if it occurs in the libvirt XML. People are known to
> >>be abusing the lack of escaping in current libvirt to
> >>pass arbitrary args to QEMU.
> >   Urgh, :-(
> >
> >>Signed-off-by: Daniel P. Berrange <berrange redhat com>
> >>---
> >>  src/qemu/qemu_command.c                            |  6 ++++
> >>  ...qemuxml2argv-disk-drive-network-rbd-invalid.xml | 37 ++++++++++++++++++++++
> >>  tests/qemuxml2argvtest.c                           |  5 +++
> >>  3 files changed, 48 insertions(+)
> >>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-invalid.xml
> >>
> >>diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> >>index eddc263..c0cb250 100644
> >>--- a/src/qemu/qemu_command.c
> >>+++ b/src/qemu/qemu_command.c
> >>@@ -2383,6 +2383,12 @@ qemuBuildRBDString(virConnectPtr conn,
> >>      char *secret = NULL;
> >>      size_t secret_size;
> >>+    if (strchr(disk->src, ':')) {
> >>+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> >>+                       _("':' not allowed in RBD source volume name"));
> >>+        return -1;
> >>+    }
> >>+
> >>      virBufferEscape(opt, ',', ",", "rbd:%s", disk->src);
> >>      if (disk->auth.username) {
> >>          virBufferEscape(opt, '\\', ":", ":id=%s", disk->auth.username);
> >>diff --git a/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-invalid.xml b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-invalid.xml
> >>new file mode 100644
> >>index 0000000..e8d3280
> >>--- /dev/null
> >>+++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd-invalid.xml
> >>@@ -0,0 +1,37 @@
> >>+<domain type='qemu'>
> >>+  <name>QEMUGuest1</name>
> >>+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
> >>+  <memory unit='KiB'>219136</memory>
> >>+  <currentMemory unit='KiB'>219136</currentMemory>
> >>+  <vcpu placement='static'>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>
> >>+    <disk type='block' device='disk'>
> >>+      <driver name='qemu' type='raw'/>
> >>+      <source dev='/dev/HostVG/QEMUGuest1'/>
> >>+      <target dev='hda' bus='ide'/>
> >>+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> >>+    </disk>
> >>+    <disk type='network' device='disk'>
> >>+      <driver name='qemu' type='raw'/>
> >>+      <source protocol='rbd' name='poolname/imagename:rbd_cache=1:rbd_cache_size=67108864:rbd_cache_max_dirty=0'>
> >>
> 
> This breaks domainschematest, as the pool name uses:
> 
>   <define name="genericName">
>     <data type="string">
>       <param name="pattern">[a-zA-Z0-9_\+\-]+</param>
>     </data>
>   </define>

Actually it doesn't use genericName - it just has

   <attribute name='name'/>

which allows any text. The problem is that I rebased across the recent
change 

  commit 470d5c4654b512d101a8665754b13866925eeaa2
  Author: Ján Tomko <jtomko redhat com>
  Date:   Thu May 9 13:43:32 2013 +0200

    tests: files named '.*-invalid.xml' should fail validation


since I named my XML file -invalid.xml it accidently tripped
up on this new change.

I'm pushing a fix which just renames my new xml file

Daniel
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