Bug#967940: libc6: systemd-sysusers SEGV due to glibc bug in fgetgsent

[Jinpu Wang <jinpu.wang@cloud.ionos.com>]

Package: libc6
Version: 2.28-10
Severity: normal
Tags: patch upstream

Dear Maintainer:

After update to Buster, the systemd-sysusers are segfaulting every time.
After search around, I found following bugreport in glibc
https://sourceware.org/legacy-ml/libc-alpha/2016-06/msg01015.html

I backported to the fix to 2.28-10, it fixed the problem.

glibc upstream have a different fix for it in 2.32, see
 https://sourceware.org/bugzilla/show_bug.cgi?id=20338

I think it's still easier to backport old 2.28 version
 

-- System Information:
Debian Release: 10.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.4.56-pserver (SMP w/64 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libc6 depends on:
ii  libgcc1  1:8.3.0-6

Versions of packages libc6 recommends:
ii  libidn2-0  2.0.5-1+deb10u1

Versions of packages libc6 suggests:
ii  debconf [debconf-2.0]  1.5.71
pn  glibc-doc              <none>
ii  libc-l10n              2.28-10
ii  locales                2.28-10

-- debconf information:
  glibc/restart-services:
  glibc/kernel-not-supported:
  glibc/disable-screensaver:
  libraries/restart-without-asking: false
  glibc/restart-failed:
  glibc/upgrade: true
  glibc/kernel-too-old: