[libvirt] [PATCH 2/2] security: aa-helper: gl devices in sysfs at arbitrary depth

[Christian Ehrhardt]

Further testing with more devices showed that we sometimes have a
different depth of pci device paths when accessing sysfs for device
attributes.

But since the access is limited to a set of filenames and read only it
is safe to use a wildcard for that.

Related apparmor denies - while we formerly had only considered:
apparmor="DENIED" operation="open"
  name="/sys/devices/pci0000:00/0000:00:02.1/uevent"
  requested_mask="r"

We now also know of cases like:
apparmor="DENIED" operation="open"
  name="/sys/devices/pci0000:00/0000:00:03.1/0000:1c:00.0/uevent"
  requested_mask="r"

Fixes: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1817943

Signed-off-by: Christian Ehrhardt <christian.ehrhardt at canonical.com>
---
 src/security/virt-aa-helper.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-helper.c
index 13b507ff69..989dcf1784 100644
--- a/src/security/virt-aa-helper.c
+++ b/src/security/virt-aa-helper.c
@@ -1286,8 +1286,7 @@ get_files(vahControl * ctl)
         virBufferAddLit(&buf, "  \"/dev/nvidiactl\" rw,\n");
         virBufferAddLit(&buf, "  # Probe DRI device attributes\n");
         virBufferAddLit(&buf, "  \"/dev/dri/\" r,\n");
-        virBufferAddLit(&buf, "  \"/sys/devices/*/*/{uevent,vendor,device,subsystem_vendor,subsystem_device}\" r,\n");
-        virBufferAddLit(&buf, "  \"/sys/devices/*/*/drm/*/{uevent,vendor,device,subsystem_vendor,subsystem_device}\" r,\n");
+        virBufferAddLit(&buf, "  \"/sys/devices/**/{uevent,vendor,device,subsystem_vendor,subsystem_device}\" r,\n");
         virBufferAddLit(&buf, "  # dri libs will trigger that, but t is not requited and DAC would deny it anyway\n");
         virBufferAddLit(&buf, "  deny \"/var/lib/libvirt/.cache/\" w,\n");
     }
-- 
2.17.1