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[Launchpad Bug Tracker <1890796@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-hwe - 5.3.0-66.60

---------------
linux-hwe (5.3.0-66.60) bionic; urgency=medium

  * bionic/linux-hwe: 5.3.0-66.60 -proposed tracker (LP: #1891053)

  * ipsec: policy priority management is broken (LP: #1890796)
    - xfrm: policy: match with both mark and mask on user interfaces

  * cgroup refcount is bogus when cgroup_sk_alloc is disabled (LP: #1886860)
    - cgroup: fix cgroup_sk_alloc() for sk_clone_lock()
    - cgroup: Fix sock_cgroup_data on big-endian.

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Tue, 11 Aug 2020 09:22:54
+0200

** Changed in: linux-hwe (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1890796

Title:
  ipsec: policy priority management is broken

Status in linux package in Ubuntu:
  Fix Released
Status in linux-hwe package in Ubuntu:
  Invalid
Status in linux-oem-5.6 package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Fix Released
Status in linux-hwe source package in Xenial:
  Invalid
Status in linux-oem-5.6 source package in Xenial:
  Invalid
Status in linux source package in Bionic:
  Fix Committed
Status in linux-hwe source package in Bionic:
  Fix Released
Status in linux-oem-5.6 source package in Bionic:
  Invalid
Status in linux source package in Focal:
  Fix Released
Status in linux-hwe source package in Focal:
  Invalid
Status in linux-oem-5.6 source package in Focal:
  Fix Released

Bug description:
  [Impact]

  When the user tries to update the priority field of a SP, the SP is
  not updated *AND* a new SP is created. This results to a broken IPsec
  configuration.

  This problem has been fixed in the upstream commit 4f47e8ab6ab7 ("xfrm: policy: match with both mark and mask on user interfaces"):
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f47e8ab6ab7

  [Test Case]

  root@dut-vm:~# uname -a
  Linux dut-vm 5.4.0-42-generic #46~18.04.1-Ubuntu SMP Fri Jul 10 07:21:24 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
  root@dut-vm:~# ip xfrm policy flush
  root@dut-vm:~# ip xfrm policy
  root@dut-vm:~# ip xfrm policy add src 1.1.1.1/24 dst 2.2.2.2/24 proto tcp dir in action allow priority 9 tmpl src 3.3.3.3 dst 4.4.4.4 proto esp mode tunnel reqid 1
  root@dut-vm:~# ip xfrm policy
  src 1.1.1.1/24 dst 2.2.2.2/24 proto tcp 
          dir in priority 9 
          tmpl src 3.3.3.3 dst 4.4.4.4
                  proto esp reqid 1 mode tunnel
  root@dut-vm:~# ip xfrm policy update src 1.1.1.1/24 dst 2.2.2.2/24 proto tcp dir in priority 5 tmpl src 3.3.3.3 dst 4.4.4.4 proto esp mode tunnel reqid 1
  root@dut-vm:~# ip xfrm policy
  src 1.1.1.1/24 dst 2.2.2.2/24 proto tcp 
          dir in priority 5 
          tmpl src 3.3.3.3 dst 4.4.4.4
                  proto esp reqid 1 mode tunnel
  src 1.1.1.1/24 dst 2.2.2.2/24 proto tcp 
          dir in priority 9 
          tmpl src 3.3.3.3 dst 4.4.4.4
                  proto esp reqid 1 mode tunnel
  root@dut-vm:~#

  => Now, there is 2 SP instead of 1.

  [Regression Potential]

  The patch affects the xfrm stack only. Thus, the potential regressions
  are limited to this area.

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