nvdimm memory is backed by a path on the host. This currently works only via
hotplug where the AppArmor label is created via the domain label callbacks.

This adds the virt-aa-helper support for nvdimm memory devices to generate
rules for the needed paths from the initial guest definition as well.

Example in domain xml:
  <memory model='nvdimm'>
    <source>
      <path>/tmp/nvdimm-base</path>
    </source>
    <target>
     <size unit='KiB'>524288</size>
     <node>0</node>
    </target>
  </memory>
Works to start now and creates:
  "/tmp/nvdimm-base" rw,

Fixes: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1757085

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
---
 src/security/virt-aa-helper.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-helper.c
index 1fc482d..0d0db0b 100644
--- a/src/security/virt-aa-helper.c
+++ b/src/security/virt-aa-helper.c
@@ -1176,6 +1176,13 @@ get_files(vahControl * ctl)
         }
     }
 
+    for (i = 0; i < ctl->def->nmems; i++) {
+        if (ctl->def->mems[i]->model == VIR_DOMAIN_MEMORY_MODEL_NVDIMM) {
+            if (vah_add_file(&buf, ctl->def->mems[i]->nvdimmPath, "rw") != 0)
+                goto cleanup;
+        }
+    }
+
     if (ctl->def->virtType == VIR_DOMAIN_VIRT_KVM) {
         for (i = 0; i < ctl->def->nnets; i++) {
             virDomainNetDefPtr net = ctl->def->nets[i];
-- 
2.7.4

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On Tue, 2018-03-20 at 13:08 +0100, Christian Ehrhardt wrote:
> nvdimm memory is backed by a path on the host. This currently works
> only via
> hotplug where the AppArmor label is created via the domain label
> callbacks.
> 
> This adds the virt-aa-helper support for nvdimm memory devices to
> generate
> rules for the needed paths from the initial guest definition as well.
> 
> Example in domain xml:
>   <memory model='nvdimm'>
>     <source>
>       <path>/tmp/nvdimm-base</path>
>     </source>
>     <target>
>      <size unit='KiB'>524288</size>
>      <node>0</node>
>     </target>
>   </memory>
> Works to start now and creates:
>   "/tmp/nvdimm-base" rw,
> 
> Fixes: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1757085
> 
> Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> ---
>  src/security/virt-aa-helper.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-
> helper.c
> index 1fc482d..0d0db0b 100644
> --- a/src/security/virt-aa-helper.c
> +++ b/src/security/virt-aa-helper.c
> @@ -1176,6 +1176,13 @@ get_files(vahControl * ctl)
>          }
>      }
>  
> +    for (i = 0; i < ctl->def->nmems; i++) {
> +        if (ctl->def->mems[i]->model ==
> VIR_DOMAIN_MEMORY_MODEL_NVDIMM) {

'if (ctl->def->mems[i] && ctl->def->mems[i]->model ==
VIR_DOMAIN_MEMORY_MODEL_NVDIMM)', no?

> +            if (vah_add_file(&buf, ctl->def->mems[i]->nvdimmPath,
> "rw") != 0)
> +                goto cleanup;
> +        }
> +    }
> +
>      if (ctl->def->virtType == VIR_DOMAIN_VIRT_KVM) {
>          for (i = 0; i < ctl->def->nnets; i++) {
>              virDomainNetDefPtr net = ctl->def->nets[i];

Adding a test case for this would be good.

-- 
Jamie Strandboge             | http://www.canonical.com--
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