Hi Jim, On Fri, Sep 22, 2017 at 05:02:42PM -0600, Jim Fehlig wrote:
Kernel 4.13 introduced finer-grained ptrace checks
With kernel 4.13 and apparmor 2.11, simply starting libvirtd results in the following apparmor denial
type=AVC msg=audit(1506112085.645:954): apparmor="DENIED" operation="ptrace" profile="/usr/sbin/libvirtd" pid=6984 comm="libvirtd" requested_mask="trace" denied_mask="trace" peer="unconfined"
Attempting to start an unconfined domain results in
type=AVC msg=audit(1506112301.227:1112): apparmor="DENIED" operation="ptrace" profile="/usr/sbin/libvirtd" pid=7498 comm="libvirtd" requested_mask="trace" denied_mask="trace" peer="/usr/sbin/libvirtd"
And attempting to start a confined domain results in
type=AVC msg=audit(1506112631.408:1312): apparmor="DENIED" operation="open" profile="virt-aa-helper" name="/etc/libnl/classid" pid=8283 comm="virt-aa-helper" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 type=AVC msg=audit(1506112631.530:1319): apparmor="DENIED" operation="open" profile="virt-aa-helper" name="/etc/libnl/classid" pid=8289 comm="virt-aa-helper" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 type=AVC msg=audit(1506112632.186:1324): apparmor="DENIED" operation="ptrace" profile="/usr/sbin/libvirtd" pid=8342 comm="libvirtd" requested_mask="trace" denied_mask="trace" peer="libvirt-66154842-e926-4f92-92f0-1c1bf61dd1ff"
Add ptrace rules to allow the trace operations.
Resolves: https://bugzilla.suse.com/show_bug.cgi?id=1058847 Signed-off-by: Jim Fehlig <jfehlig@suse.com> ---
V3: fix ptrace rule for per-domain profiles
V2: restrict ptrace permissions drop support for dbus, signal, and unix
examples/apparmor/usr.sbin.libvirtd | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/examples/apparmor/usr.sbin.libvirtd b/examples/apparmor/usr.sbin.libvirtd index acb59e071..fa4ebb355 100644 --- a/examples/apparmor/usr.sbin.libvirtd +++ b/examples/apparmor/usr.sbin.libvirtd @@ -37,6 +37,10 @@ network packet dgram, network packet raw,
+ ptrace (trace) peer=unconfined, + ptrace (trace) peer=/usr/sbin/libvirtd, + ptrace (trace) peer=libvirt-*, +
This works here too! And I can even drop the first rule (ptrace (trace) peer=unconfined) and things still work (and from reading the profile and Jamies explanations it should work without it). Can you check if that works for you too? Otherwise: Reviewed-By: Guido Günther <agx@sigxcpu.org>
# Very lenient profile for libvirtd since we want to first focus on confining # the guests. Guests will have a very restricted profile. / r, -- 2.14.1