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

[Launchpad Bug Tracker]

This bug was fixed in the package glibc - 2.35-0ubuntu3.3

---------------
glibc (2.35-0ubuntu3.3) jammy; urgency=medium

  * Drop SVE patches due to kernal-related performance regression
  * Fix the armhf stripping exception for ld.so (LP: #1927192)

glibc (2.35-0ubuntu3.2) jammy; urgency=medium

  * d/rules.d/debhelper.mk: fix permissions of libc.so (LP: #1989082)
  * Cherry-picks from upstream:
    - d/p/lp1999551/*: arm64 memcpy optimization (LP: #1999551)
    - d/p/lp1995362*.patch: Fix ldd segfault with missing libs (LP: #1995362)
    - d/p/lp2007796*: Fix missing cancellation point in pthread (LP: #2007796)
    - d/p/lp2007599*: add new tunables for s390x (LP: #2007599)
    - d/p/lp2011421/*: Fix crash on TDX-enabled platforms (LP: #2011421)
    - d/p/lp1992159*: Fix socket.h headers for non-GNU compilers (LP: #1992159)

 -- Simon Chopin <schopin at ubuntu.com>  Wed, 26 Jul 2023 10:27:54 +0200

** Changed in: glibc (Ubuntu Jammy)
       Status: Fix Committed => Fix Released

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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:
  In Progress
Status in glibc source package in Jammy:
  Fix Released
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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