From 4d0e323227f18e58283c45be4d240b506faacb22 Mon Sep 17 00:00:00 2001 Message-Id: <4d0e323227f18e58283c45be4d240b506faacb22.1610390294.git.crobinso@redhat.com> From: Martin Pitt Date: Tue, 24 Nov 2020 14:24:06 +0100 Subject: [PATCH virt-manager] virtinst: Fix TOCTOU in domain enumeration Similar to commit 49a01b5482, _fetch_all_domains_raw() has a race condition where a domain may disappear (from parallel libvirt operations) in between enumerating and inspecting the objects. Ignore these missing domains instead of crashing. https://bugzilla.redhat.com/show_bug.cgi?id=1901081 Signed-off-by: Cole Robinson --- virtinst/connection.py | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/virtinst/connection.py b/virtinst/connection.py index fec273b7..06bc60ad 100644 --- a/virtinst/connection.py +++ b/virtinst/connection.py @@ -182,8 +182,16 @@ class VirtinstConnection(object): def _fetch_all_domains_raw(self): dummy1, dummy2, ret = pollhelpers.fetch_vms( self, {}, lambda obj, ignore: obj) - return [Guest(weakref.proxy(self), parsexml=obj.XMLDesc(0)) - for obj in ret] + domains = [] + for obj in ret: + # TOCTOU race: a domain may go away in between enumeration and inspection + try: + xml = obj.XMLDesc(0) + except libvirt.libvirtError as e: # pragma: no cover + log.debug("Fetching domain XML failed: %s", e) + continue + domains.append(Guest(weakref.proxy(self), parsexml=xml)) + return domains def _build_pool_raw(self, poolobj): return StoragePool(weakref.proxy(self), -- 2.29.2