ipv6: fix neighbour resolution with raw socket

Bug #1834465 reported by Nicolas Dichtel on 2019-06-27
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Undecided
Kamal Mostafa
Bionic
Medium
Unassigned
Disco
Medium
Kamal Mostafa

Bug Description

[SRU Justification]

== Impact ==

IPv6 packets may be dropped during the neighbor resolution when a
userspace program uses IPv6 raw sockets. The commit that introduces
this bug has not been identified, but it's here at least from Xenial (4.4).
This was fixed in the requested backport (from 5.2).

== Fix ==

Backport the requested patches to Disco (5.0), Bionic (4.15) and
Xenial (4.4).

== Risk of Regregression ==

The change slightly modifies the target IPv6 address in neighbor
resolution engine. Risk should be low and limited to ipv6.

---

With an IPv6 raw socket, packets may be dropped during the neighbour resolution. It is fixed upstream by these patches:

9b1c1ef13b35 ipv6: constify rt6_nexthop()
2c6b55f45d53 ipv6: fix neighbour resolution with raw socket

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=9b1c1ef13b35fa35051b635ca9fbda39fe6bbc70
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=2c6b55f45d53420d8310d41310e0e2cd41fe073f

The detail of the bug is explained in the second patch.

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1834465

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
Changed in linux (Ubuntu Disco):
status: New → In Progress
assignee: nobody → Kamal Mostafa (kamalmostafa)
Changed in linux (Ubuntu):
status: Incomplete → In Progress
assignee: nobody → Kamal Mostafa (kamalmostafa)
description: updated
Stefan Bader (smb) on 2019-08-29
Changed in linux (Ubuntu Disco):
importance: Undecided → Medium
Changed in linux (Ubuntu Disco):
status: In Progress → Fix Committed

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-disco' to 'verification-done-disco'. If the problem still exists, change the tag 'verification-needed-disco' to 'verification-failed-disco'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-disco

Tests are ok for us.

tags: added: verification-done-disco
removed: verification-needed-disco
Stefan Bader (smb) on 2019-09-25
Changed in linux (Ubuntu Bionic):
importance: Undecided → Medium
Changed in linux (Ubuntu Bionic):
status: New → Fix Committed

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-bionic

Tests are ok here.

tags: added: verification-done-bionic
removed: verification-needed-bionic
Launchpad Janitor (janitor) wrote :
Download full text (126.4 KiB)

This bug was fixed in the package linux - 5.0.0-31.33

---------------
linux (5.0.0-31.33) disco; urgency=medium

  * disco/linux: 5.0.0-31.33 -proposed tracker (LP: #1846026)

  * Packaging resync (LP: #1786013)
    - [Packaging] update helper scripts

  * /proc/self/maps paths missing on live session (was vlc won't start; eoan
    19.10 & bionic 18.04 ubuntu/lubuntu/kubuntu/xubuntu/ubuntu-mate dailies)
    (LP: #1842382)
    - SAUCE: Revert "UBUNTU: SAUCE: shiftfs: enable overlayfs on shiftfs"

linux (5.0.0-30.32) disco; urgency=medium

  * disco/linux: 5.0.0-30.32 -proposed tracker (LP: #1844362)

  * Disco update: upstream stable patchset 2019-08-20 (LP: #1840846)
    - Revert "e1000e: fix cyclic resets at link up with active tx"
    - e1000e: start network tx queue only when link is up
    - Input: synaptics - enable SMBUS on T480 thinkpad trackpad
    - nilfs2: do not use unexported cpu_to_le32()/le32_to_cpu() in uapi header
    - drivers: base: cacheinfo: Ensure cpu hotplug work is done before Intel RDT
    - firmware: improve LSM/IMA security behaviour
    - irqchip/gic-v3-its: Fix command queue pointer comparison bug
    - clk: ti: clkctrl: Fix returning uninitialized data
    - efi/bgrt: Drop BGRT status field reserved bits check
    - perf/core: Fix perf_sample_regs_user() mm check
    - ARM: dts: gemini Fix up DNS-313 compatible string
    - ARM: omap2: remove incorrect __init annotation
    - afs: Fix uninitialised spinlock afs_volume::cb_break_lock
    - x86/apic: Fix integer overflow on 10 bit left shift of cpu_khz
    - be2net: fix link failure after ethtool offline test
    - ppp: mppe: Add softdep to arc4
    - sis900: fix TX completion
    - ARM: dts: imx6ul: fix PWM[1-4] interrupts
    - pinctrl: mcp23s08: Fix add_data and irqchip_add_nested call order
    - dm table: don't copy from a NULL pointer in realloc_argv()
    - dm verity: use message limit for data block corruption message
    - x86/boot/64: Fix crash if kernel image crosses page table boundary
    - x86/boot/64: Add missing fixup_pointer() for next_early_pgt access
    - HID: chicony: add another quirk for PixArt mouse
    - pinctrl: mediatek: Ignore interrupts that are wake only during resume
    - cpu/hotplug: Fix out-of-bounds read when setting fail state
    - pinctrl: mediatek: Update cur_mask in mask/mask ops
    - linux/kernel.h: fix overflow for DIV_ROUND_UP_ULL
    - genirq: Delay deactivation in free_irq()
    - genirq: Fix misleading synchronize_irq() documentation
    - genirq: Add optional hardware synchronization for shutdown
    - x86/ioapic: Implement irq_get_irqchip_state() callback
    - x86/irq: Handle spurious interrupt after shutdown gracefully
    - x86/irq: Seperate unused system vectors from spurious entry again
    - ARC: hide unused function unw_hdr_alloc
    - s390: fix stfle zero padding
    - s390/qdio: (re-)initialize tiqdio list entries
    - s390/qdio: don't touch the dsci in tiqdio_add_input_queues()
    - crypto: talitos - move struct talitos_edesc into talitos.h
    - crypto: talitos - fix hash on SEC1.
    - crypto/NX: Set receive window credits to max number of CRBs in RxFIFO
    - drm/udl: introduce a macro to convert dev t...

Changed in linux (Ubuntu Disco):
status: Fix Committed → Fix Released
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