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