Kernel 4.13 introduced finer-grained ptrace checks https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/c... 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(a)suse.com&gt; --- 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-*, +

# 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

Hi, On Sun, Sep 24, 2017 at 02:26:01PM +0200, Guido Günther wrote: > Hi Jim, > On Fri, Sep 22, 2017 at 05:02:42PM -0600, Jim Fehlig wrote: > > Kernel 4.13 introduced finer-grained ptrace checks > > > > https://git.kernel.org/pub/scm/linux/kernel/git/stable/ linux-stable.git/commit/?h=v4.13.2&id=290f458a4f16f9cf6cb6562b249e69 fe1c3c3a07 > > > > 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(a)suse.com&gt; > > --- > > > > 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(a)sigxcpu.org&gt; I've pushed that patch as is since without the unconfined ptrace we're seeing denials with gnome-boxes and virsh. Cheers, -- Guido > > > > # 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 > > > > -- > libvir-list mailing list > libvir-list(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvir-list > -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list