[Bug 1674776] Re: getaddrinfo() dont work correct with ipv4+ipv6 addreses aftrer upgrade libc6 in Ubuntu Precise

[Dmitry Bilunov]

Test failes on 2.15-0ubuntu10.17, succeeds on 2.15-0ubuntu10.18.
Tested on docker image ubuntu:12.04 (b384dd9703db).

** Attachment added: "docker.txt"
   https://bugs.launchpad.net/eglibc/+bug/1674776/+attachment/4844145/+files/docker.txt

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Title:
  getaddrinfo() dont work correct with ipv4+ipv6 addreses aftrer upgrade
  libc6 in Ubuntu Precise

Status in eglibc:
  New
Status in eglibc package in Ubuntu:
  Invalid
Status in eglibc source package in Precise:
  Fix Released

Bug description:
  getaddrinfo() dont work correct with ipv4+ipv6 addreses aftrer upgrade
  libc6 in Ubuntu Precise.

  server has only ipv6 address.
  Ubuntu 12.04.5 LTS \n \l
  libc6 = 2.15-0ubuntu10.16

  host ya.ru
  YA.ru has address 93.158.134.3
  YA.ru has address 213.180.193.3
  YA.ru has address 213.180.204.3
  YA.ru has IPv6 address 2a02:6b8::3

  strace -e connect nc -zv ya.ru http
  connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("213.180.193.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  connect(3, {sa_family=AF_UNSPEC, sa_data="\0\0\0\0\0\0\0\0\0\0\0\0\0\0"}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("213.180.204.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  connect(3, {sa_family=AF_UNSPEC, sa_data="\0\0\0\0\0\0\0\0\0\0\0\0\0\0"}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("93.158.134.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("213.180.193.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  nc: connect to ya.ru port 80 (tcp) failed: Network is unreachable
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("213.180.204.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  nc: connect to ya.ru port 80 (tcp) failed: Network is unreachable
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("93.158.134.3")}, 16) = -1 ENETUNREACH (Network is unreachable)

  nc: connect to ya.ru port 80 (tcp) failed: Network is unreachable

  python -c 'import socket; print socket.getaddrinfo("ya.ru.", 0, socket.AF_UNSPEC, 0)[0][4]'; python -c 'import socket; print socket.getaddrinfo("ya.ru.", 0, socket.AF_INET6, 0)[0][4]'
  ('93.158.134.3', 0)
  ('2a02:6b8::3', 0, 0, 0)

  before update libc6=2.15-0ubuntu10.15

  strace -e connect nc -zv ya.ru http
  connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
  connect(3, {sa_family=AF_INET6, sin6_port=htons(80), inet_pton(AF_INET6, "2a02:6b8::3", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
  connect(3, {sa_family=AF_UNSPEC, sa_data="\0\0\0\0\0\0\0\0\0\0\0\0\0\0"}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("93.158.134.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  connect(3, {sa_family=AF_UNSPEC, sa_data="\0\0\0\0\0\0\0\0\0\0\0\0\0\0"}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("213.180.193.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  connect(3, {sa_family=AF_UNSPEC, sa_data="\0\0\0\0\0\0\0\0\0\0\0\0\0\0"}, 16) = 0
  connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("213.180.204.3")}, 16) = -1 ENETUNREACH (Network is unreachable)
  connect(3, {sa_family=AF_INET6, sin6_port=htons(80), inet_pton(AF_INET6, "2a02:6b8::3", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 EINPROGRESS (Operation now in progress)

  Connection to ya.ru 80 port [tcp/http] succeeded!

  python -c 'import socket; print socket.getaddrinfo("ya.ru.", 0, socket.AF_UNSPEC, 0)[0][4]'; python -c 'import socket; print socket.getaddrinfo("ya.ru.", 0, socket.AF_INET6, 0)[0][4]'
  ('2a02:6b8::3', 0, 0, 0)
  ('2a02:6b8::3', 0, 0, 0)

  I think problem with patch: CVE-2016-3706: getaddrinfo: stack overflow in hostent conversion [BZ #20010]
  https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=blobdiff;f=sysdeps/posix/getaddrinfo.c;h=df6ce8b13e3897f3ed47877b029da39abafe9f25;hp=d2283bcd4ad4fe7e41cf9c6ee74ec8c63ab32e34;hb=762aafec34478bcef01a16acf1959732ab8bb2b6;hpb=e97fb84811238c627f93e5e703a11eb841601947;ds=sidebyside

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