abc01259ad
nwfilter: fix crash when counting number of network filters (CVE-2022-0897) Signed-off-by: yezengruan <yezengruan@huawei.com>
55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
From b67c839e409b4e49b69ffdab947af91791820411 Mon Sep 17 00:00:00 2001
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From: AlexChen <alex.chen@huawei.com>
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Date: Tue, 8 Mar 2022 17:28:38 +0000
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Subject: [PATCH] nwfilter: fix crash when counting number of network filters
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The virNWFilterObjListNumOfNWFilters method iterates over the
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driver->nwfilters, accessing virNWFilterObj instances. As such
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it needs to be protected against concurrent modification of
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the driver->nwfilters object.
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This API allows unprivileged users to connect, so users with
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read-only access to libvirt can cause a denial of service
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crash if they are able to race with a call of virNWFilterUndefine.
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Since network filters are usually statically defined, this is
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considered a low severity problem.
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This is assigned CVE-2022-0897.
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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cherry-picked from a4947e8f63c3e6
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Signed-off-by: AlexChen <alex.chen@huawei.com>
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---
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src/nwfilter/nwfilter_driver.c | 8 ++++++--
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1 file changed, 6 insertions(+), 2 deletions(-)
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diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c
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index 1c407727db..27500d192a 100644
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--- a/src/nwfilter/nwfilter_driver.c
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+++ b/src/nwfilter/nwfilter_driver.c
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@@ -514,11 +514,15 @@ nwfilterLookupByName(virConnectPtr conn,
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static int
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nwfilterConnectNumOfNWFilters(virConnectPtr conn)
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{
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+ int ret;
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if (virConnectNumOfNWFiltersEnsureACL(conn) < 0)
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return -1;
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- return virNWFilterObjListNumOfNWFilters(driver->nwfilters, conn,
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- virConnectNumOfNWFiltersCheckACL);
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+ nwfilterDriverLock();
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+ ret = virNWFilterObjListNumOfNWFilters(driver->nwfilters, conn,
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+ virConnectNumOfNWFiltersCheckACL);
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+ nwfilterDriverUnlock();
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+ return ret;
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}
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--
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2.27.0
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