[PATCH 3/4] virt-aa-helper: generate rules for passthrough input devices

[Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>]

Input devices can passthrough an event device. 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 passthrough input devices to generate
rules for the needed paths from the initial guest definition as well.

Example in domain xml:
  <input type='passthrough' bus='virtio'>
          <source evdev='/dev/input/event0' />
  </input>
Works to start now and creates:
  "/dev/input/event0" rw,

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

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>
---
 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 456cfce..1fc482d 100644
--- a/src/security/virt-aa-helper.c
+++ b/src/security/virt-aa-helper.c
@@ -1157,6 +1157,13 @@ get_files(vahControl * ctl)
         }
     }
 
+    for (i = 0; i < ctl->def->ninputs; i++) {
+        if (ctl->def->inputs[i]->type == VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH) {
+            if (vah_add_file(&buf, ctl->def->inputs[i]->source.evdev, "rw") != 0)
+                goto cleanup;
+        }
+    }
+
     for (i = 0; i < ctl->def->nnets; i++) {
         if (ctl->def->nets[i] &&
                 ctl->def->nets[i]->type == VIR_DOMAIN_NET_TYPE_VHOSTUSER &&
-- 
2.7.4

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