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

[Simon Chopin]

I adjusted the test plan to use a slightly modified version of your
script, thanks!

** Description changed:

  [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
+ Run the following script:
  
- -> 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>.
+ ```
+ #!/bin/bash
+ 
+ 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
+         echo "GLibc minor version is $_libcver"
+         break
+     fi
+ done
+ if [ "$_libcver" = "" ] ; then
+     echo "Cannot figure out the GLibc version."
+     exit 1
+ fi
+ ```
+ 
+ On Focal, it prints out the following:
+   GLibc minor version is 31
+ 
+ On Jammy:
+   Cannot figure out the GLibc version.
+ Expected:
+   GLibc minor version is 35
  
  [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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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]

  Run the following script:

  ```
  #!/bin/bash

  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
          echo "GLibc minor version is $_libcver"
          break
      fi
  done
  if [ "$_libcver" = "" ] ; then
      echo "Cannot figure out the GLibc version."
      exit 1
  fi
  ```

  On Focal, it prints out the following:
    GLibc minor version is 31

  On Jammy:
    Cannot figure out the GLibc version.
  Expected:
    GLibc minor version is 35

  [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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