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[libvirt] [PATCH] apparmor: allow qemu abstraction to read /proc/pid/cmdline

Noticed the following denial in audit.log when shutting down
an apparmor confined domain

type=AVC msg=audit(1512002299.742:131): apparmor="DENIED"
operation="open" profile="libvirt-66154842-e926-4f92-92f0-1c1bf61dd1ff"
name="/proc/1475/cmdline" pid=2958 comm="qemu-system-x86"
requested_mask="r" denied_mask="r" fsuid=469 ouid=0

Squelch the denial by allowing read access to /proc/<pid>/cmdline.

Signed-off-by: Jim Fehlig <jfehlig suse com>

Note: In the audit.log snippet, PID 1475 is libvirtd and 2958 is the
qemu process. I must admit it is not clear to me why
/proc/<libvirtd-pid>/cmdline is read on domain shutdown.

 examples/apparmor/libvirt-qemu | 1 +
 1 file changed, 1 insertion(+)

diff --git a/examples/apparmor/libvirt-qemu b/examples/apparmor/libvirt-qemu
index 73bdbae87..3d9eed9ec 100644
--- a/examples/apparmor/libvirt-qemu
+++ b/examples/apparmor/libvirt-qemu
@@ -25,6 +25,7 @@
   /dev/ptmx rw,
   /dev/kqemu rw,
   @{PROC}/*/status r,
+  @{PROC}/@{pid}/cmdline r,
   # Per man(5) proc, the kernel enforces that a thread may
   # only modify its comm value or those in its thread group.
   owner @{PROC}/@{pid}/task/@{tid}/comm rw,

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