Bug#821358: nss_hesiod segfaults in sock_eq

[Anders Kaseorg <andersk@mit.edu>]

Control: reopen -1
Control: found -1 2.19-18+deb8u6
Control: tags -1 + jessie

On Sun, 17 Apr 2016, Anders Kaseorg wrote:
> glibc 2.22 broke nss_hesiod so that it segfaults on almost all uses.  To 
> reproduce:
> 
> # sed -i 's/^passwd:.*/& hesiod/' /etc/nsswitch.conf
> # cat > /etc/hesiod.conf <<EOF
> lhs=.ns
> rhs=.athena.mit.edu
> EOF
> # id andersk
> Segmentation fault (core dumped)
> 
> See also:
> 
> https://sourceware.org/bugzilla/show_bug.cgi?id=19573
> https://bugzilla.redhat.com/show_bug.cgi?id=1252570
> https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456

The patch introducing this bug was backported to jessie in 2.19-18+deb8u6 
as debian/patches/any/submitted-resolv-ipv6-nameservers.diff 
(https://bugs.debian.org/818281) without the fix.  Therefore, jessie is 
now also affected.

# id andersk
uid=39270(andersk) gid=101(libuuid) groups=101(libuuid)
# apt install libc6
…
Preparing to unpack .../libc6_2.19-18+deb8u6_amd64.deb ...
Unpacking libc6:amd64 (2.19-18+deb8u6) over (2.19-18+deb8u4) ...
Setting up libc6:amd64 (2.19-18+deb8u6) ...
…
# id andersk
Segmentation fault (core dumped)

Anders