So, investigated this into an apparmor difference between 4.17 and 4.18.
This is due to commit 338d0be437ef10e247a35aed83dbab182cf406a2
("apparmor: fix ptrace read check").
libvirtd here is using only trace, and not read. The patch below for
libvirtd apparmor policy fixes it for me.
--- /etc/apparmor.d/usr.sbin.libvirtd 2018-08-23 14:52:04.574252908 -0300
+++ ../usr.sbin.libvirtd 2018-08-23 14:51:46.773728841 -0300
@@ -50,10 +50,10 @@
# for --p2p migrations
unix (send, receive) type=stream addr=none peer=(label=unconfined addr=none),
- ptrace (trace) peer=unconfined,
- ptrace (trace) peer=/usr/sbin/libvirtd,
- ptrace (trace) peer=/usr/sbin/dnsmasq,
- ptrace (trace) peer=libvirt-*,
+ ptrace (read,trace) peer=unconfined,
+ ptrace (read,trace) peer=/usr/sbin/libvirtd,
+ ptrace (read,trace) peer=/usr/sbin/dnsmasq,
+ ptrace (read,trace) peer=libvirt-*,
signal (send) peer=/usr/sbin/dnsmasq,
signal (read, send) peer=libvirt-*,
** Also affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
** Also affects: libvirt (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Cosmic)
Importance: High
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Changed in: libvirt (Ubuntu Cosmic)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1788603
Title:
libvirt fails with failure to open mount namespace
Status in libvirt package in Ubuntu:
New
Status in linux package in Ubuntu:
In Progress
Status in libvirt source package in Cosmic:
New
Status in linux source package in Cosmic:
In Progress
Bug description:
$ virsh start cosmic-i386
error: Failed to start domain cosmic-i386
error: internal error: child reported: Kernel does not provide mount
namespace: Permission denied
Happens with 4.18 only, 4.17 is fine.
27013 openat(AT_FDCWD, "/proc/27012/ns/mnt", O_RDONLY) = -1 EACCES
(Permission denied)
Opening a self or parent mount namespace works fine as tested with cat
/proc/self/ns/mnt and cat /proc/self/$$/mnt. Still investigating.
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https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1788603/+subscriptions
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