[Bug 1989082] Re: execute bit is missing on libc.so.6

[Reinhold Koch]

OK, IBM's LSF scheduler is only used by some HPC installations. I can
imagine other software also using a similar trick to determine in a
script the glibc version as LSF does:

```
                for glibc in `ldconfig -p | grep libc.so.6 | sed 's/.*=>//'`
                do
                    if [ -x "$glibc" ] ; then
                        $glibc >/dev/null 2>&1
                        if [ "$?" != "0" ] ; then
                            continue
                        fi
                        _libcver=`$glibc 2>/dev/null | grep "GNU C Library" | $AWK '{print $10}' | $AWK -F. '{print $2}' | sed 's/,//'`
                    fi
                    if [ "$_libcver" != "" ] ; then
                        break
                    fi
                done
                if [ "$_libcver" = "" ] ; then
                    echo "Cannot figure out the GLibc version."
                    exit 1
                fi
```

Maybe this code is worth becoming a test?

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https://bugs.launchpad.net/bugs/1989082

Title:
  execute bit is missing on libc.so.6

Status in glibc package in Ubuntu:
  Triaged
Status in glibc source package in Jammy:
  In Progress
Status in glibc source package in Kinetic:
  Won't Fix
Status in glibc source package in Lunar:
  Won't Fix

Bug description:
  [Impact]
  Starting with Ubuntu 22.04 the execute bit is no longer set on /lib/x86_64-linux-gnu/libc.so.6. This causes trouble for some scripts that try to determine the glibc version by executing this file, for instance the LSF scheduler.

  [Proposed fix]

  Adjust the build system to chmod the library after the fixperms stage.
  This has been fixed in Debian, although it's not easily cherry-
  pickable.

  [Test plan]

  $ /lib/x86_64-linux-gnu/libc.so.6

  -> This should print something similar to this:
  GNU C Library (Ubuntu GLIBC 2.35-0ubuntu3.1) stable release version 2.35.
  Copyright (C) 2022 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions.
  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
  PARTICULAR PURPOSE.
  Compiled by GNU CC version 11.2.0.
  libc ABIs: UNIQUE IFUNC ABSOLUTE
  For bug reporting instructions, please see:
  <https://bugs.launchpad.net/ubuntu/+source/glibc/+bugs>.

  [Regression potential]

  This change is fairly minimal, but could expose bugs in codepaths that
  were depending on the system version of glibc and were thus far
  dormant in Jammy.

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