[Bug 1888543] Re: hwclock: fails to set time on glibc 2.31

[Balint Reczey]

Verified on Groovy with 1:1.30.1-4ubuntu9.1:

ubuntu at gg:~$ dpkg -l busybox-static | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version           Architecture Description
+++-==============-=================-============-======================================================
ii  busybox-static 1:1.30.1-4ubuntu9 amd64        Standalone rescue shell with tons of builtin utilities
ubuntu at gg:~$ sudo busybox hwclock -s
hwclock: settimeofday: Invalid argument
ubuntu at gg:~$ sudo apt -qq install busybox-static
The following packages will be upgraded:
  busybox-static
1 upgraded, 0 newly installed, 0 to remove and 11 not upgraded.
Need to get 915 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 64660 files and directories currently installed.)
Preparing to unpack .../busybox-static_1%3a1.30.1-4ubuntu9.1_amd64.deb ...
Unpacking busybox-static (1:1.30.1-4ubuntu9.1) over (1:1.30.1-4ubuntu9) ...
Setting up busybox-static (1:1.30.1-4ubuntu9.1) ...
Processing triggers for man-db (2.9.3-2) ...
Processing triggers for initramfs-tools (0.137ubuntu12) ...
update-initramfs: Generating /boot/initrd.img-5.8.0-29-generic
ubuntu at gg:~$ sudo busybox hwclock -s
ubuntu at gg:~$

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https://bugs.launchpad.net/bugs/1888543

Title:
  hwclock: fails to set time on glibc 2.31

Status in busybox package in Ubuntu:
  Fix Released
Status in busybox source package in Focal:
  Fix Committed
Status in busybox source package in Groovy:
  Fix Committed
Status in busybox package in Debian:
  Confirmed

Bug description:
  [Impact]
   * With glibc 2.31, hwclock from busybox is unable to set the system time
     due to the changes in settimeofday behavior.

  [Test Case]
  * Run:
    sudo busybox hwclock -s

  * It should succeed in the fixed version

  [Where problems could occur]
  * The fix calls the originally called glibc function twice, instead of passing both non-NULL parameters at once. If this compiles there should be no other issue.

  [Original Bug Text]
  With glibc 2.31, hwclock from busybox is unable to set the system time
  due to the changes in settimeofday behavior.

  The problem has been reported upstream in [1] which also contains a
  patch.

  hwclock from busybox is important as it's used on the Raspberry Pi to set the system
  time when an RTC is present.

  This bug applies to focal and groovy.

  [1] https://bugs.busybox.net/show_bug.cgi?id=12756

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