[Bug 1481388] [NEW] NTP : Use-after-free in routing socket code after dropping root

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Robie Basak (racb):

We have 1 server (among hundreds) that its ntp service is crashing.

A few minute/seconds after a start attempts we can see the following in syslog:
ntpd[2729]: peers refreshed
ntpd[2729]: Listening on routing socket on fd #49 for interface updates
ntpd[2729]: i/o error on routing socket No buffer space available - disabling
kernel: [157516.495224] ntpd[2729]: segfault at 31 ip 0000000000000031 sp 00007ffff9f11788 error 14 in libpthread-2.15.so[7f967a5d9000+18000]

OS: Ubuntu 12.04.4 LTS
Kernel: 3.11.0-19-generic

I tried to compare it to other servers, and the only thing I could find that is different is that while it's up (before it crashes) I can see the following when running "lsof | grep ntp":
ntpd 2729 ntp 49u sock 0,7 0t0 2473952565 can't identify protocol.

** Affects: ntp (Ubuntu)
     Importance: Low
     Assignee: Eric Desrochers (eric-desrochers-z)
         Status: Confirmed

** Affects: ntp (Ubuntu Precise)
     Importance: Undecided
         Status: New

** Affects: ntp (Ubuntu Trusty)
     Importance: Undecided
     Assignee: Eric Desrochers (eric-desrochers-z)
         Status: Confirmed

** Affects: ntp (Ubuntu Vivid)
     Importance: Undecided
         Status: New

** Affects: ntp (Ubuntu Wily)
     Importance: Low
     Assignee: Eric Desrochers (eric-desrochers-z)
         Status: Confirmed

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NTP : Use-after-free in routing socket code after dropping root
https://bugs.launchpad.net/bugs/1481388
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