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[Adam Conrad <adconrad@xxxxxxx>]

** Also affects: ntp (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Also affects: ntp (Ubuntu Precise)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1481388

Title:
  NTP : Use-after-free in routing socket code after dropping root

Status in ntp package in Ubuntu:
  Confirmed
Status in ntp source package in Precise:
  New
Status in ntp source package in Trusty:
  Confirmed
Status in ntp source package in Vivid:
  New
Status in ntp source package in Wily:
  Confirmed

Bug description:
  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.

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