This bug was fixed in the package linux - 3.19.0-78.86
---------------
linux (3.19.0-78.86) vivid; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1647787
* CVE-2016-7916
- proc: prevent accessing /proc/<PID>/environ until it's ready
* CVE-2016-6213
- mnt: Add a per mount namespace limit on the number of mounts
* [Hyper-V] do not lose pending heartbeat vmbus packets (LP: #1632786)
- hv: do not lose pending heartbeat vmbus packets
* ipv6: connected routes are missing after a down/up cycle on the loopback
(LP: #1634545)
- ipv6: correctly add local routes when lo goes up
-- Luis Henriques <[email protected]> Tue, 06 Dec 2016
16:25:45 +0000
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https://bugs.launchpad.net/bugs/1634545
Title:
ipv6: connected routes are missing after a down/up cycle on the
loopback
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Trusty:
Fix Released
Status in linux source package in Vivid:
Fix Released
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Yakkety:
Fix Committed
Bug description:
This upstream patch is missing:
http://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=a220445f9f4382c36a53d8ef3e08165fa27f7e2c
ipv6: correctly add local routes when lo goes up
The goal of the patch is to fix this scenario:
ip link add dummy1 type dummy
ip link set dummy1 up
ip link set lo down ; ip link set lo up
After that sequence, the local route to the link layer address of dummy1 is
not there anymore.
When the loopback is set down, all local routes are deleted by
addrconf_ifdown()/rt6_ifdown(). At this time, the rt6_info entry still
exists, because the corresponding idev has a reference on it. After the rcu
grace period, dst_rcu_free() is called, and thus ___dst_free(), which will
set obsolete to DST_OBSOLETE_DEAD.
In this case, init_loopback() is called before dst_rcu_free(), thus
obsolete is still sets to something <= 0. So, the function doesn't add the
route again. To avoid that race, let's check the rt6 refcnt instead.
Fixes: 25fb6ca4ed9c ("net IPv6 : Fix broken IPv6 routing table after loopback
down-up")
Fixes: a881ae1f625c ("ipv6: don't call addrconf_dst_alloc again when enable
lo")
Fixes: 33d99113b110 ("ipv6: reallocate addrconf router for ipv6 address when
lo device up")
Reported-by: Francesco Santoro <[email protected]>
Reported-by: Samuel Gauthier <[email protected]>
CC: Balakumaran Kannan <[email protected]>
CC: Maruthi Thotad <[email protected]>
CC: Sabrina Dubroca <[email protected]>
CC: Hannes Frederic Sowa <[email protected]>
CC: Weilong Chen <[email protected]>
CC: Gao feng <[email protected]>
Signed-off-by: Nicolas Dichtel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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