[Bug 2074330] Re: [SRU] please enable framepointer for libio-dirent-perl

[Vladimir Petko]

Verification:
 - Validate symbols (pass):
# wget https://launchpad.net/ubuntu/+archive/primary/+files/libio-dirent-perl-dbgsym_0.05-1.1ubuntu0.1_amd64.ddeb
# apt install ./libio-dirent-perl-dbgsym_0.05-1.1ubuntu0.1_amd64.ddeb
# wget https://gist.githubusercontent.com/julian-klode/85e55553f85c410a1b856a93dce77208/raw/488b8509e6f23fe48f917961fe711b285dcb2e28/dwprod.py
# apt install python3-pyelftools
# python3 dwprod.py /usr/lib/x86_64-linux-gnu/perl5/5.38/auto/IO/Dirent/Dirent.so
/usr/lib/x86_64-linux-gnu/perl5/5.38/auto/IO/Dirent/Dirent.so elf
/usr/lib/x86_64-linux-gnu/perl5/5.38/auto/IO/Dirent/Dirent.so unit <artificial> produced-by GNU GIMPLE 13.3.0 -mno-omit-leaf-frame-pointer -mtune=generic -march=x86-64 -g -O2 -O2 -fno-openmp -fno-openacc -fcf-protection=full -fPIC -fasynchronous-unwind-tables -fstack-protector-strong -fltrans
/usr/lib/x86_64-linux-gnu/perl5/5.38/auto/IO/Dirent/Dirent.so unit Dirent.c produced-by GNU C17 13.3.0 -mno-omit-leaf-frame-pointer -mtune=generic -march=x86-64 -g -g -O2 -O2 -fwrapv -fno-strict-aliasing -fno-omit-frame-pointer -flto -ffat-lto-objects -fstack-protector-strong -fcf-protection=full -fPIC -fasynchronous-unwind-tables -fstack-protector-strong -fstack-clash-protection

-fno-omit-framepointer flag is present


** Tags removed: verification-needed verification-needed-noble
** Tags added: verification-done verification-done-noble

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https://bugs.launchpad.net/bugs/2074330

Title:
  [SRU] please enable framepointer for libio-dirent-perl

Status in libio-dirent-perl package in Ubuntu:
  Fix Released
Status in libio-dirent-perl source package in Noble:
  Fix Committed
Status in libio-dirent-perl source package in Oracular:
  Fix Released
Status in libio-dirent-perl package in Debian:
  Fix Released

Bug description:
  [Impact]

  In order to help developers with profiling, Ubuntu enabled frame-
  pointers for packages in the main archive.

  https://ubuntu.com/blog/ubuntu-performance-engineering-with-frame-
  pointers-by-default

  The `Affects` packages were missed due to the packaging issues. These
  have been fixed on Oracular and can now be ported to Noble.

  [Test Plan]

  Look at the DW_AT_producer in the associated debug ELF file for flags.
  -fno-omit-frame-pointer should be present after the fix.

  The following scripts can be used as a reference
  https://gist.github.com/julian-klode/85e55553f85c410a1b856a93dce77208
  https://gist.github.com/julian-klode/95818246eaef0ac6a54588f7f368e25c

  Run the smoke test:

  $apt-get install libio-dirent-perl
  $apt source libio-dirent-perl
  cd to package source directory
  $sed -i 's/use blib;//g' test.pl
  $perl test.pl

  Expected output:
  ok 1
  ok 2
  ok 3

  [Where problems could occur]

  No source changes are made. The packaging fixes have enabled other
  security hardening flags. This could have unintended effects.

  [Other Info]

  changes in dpkg have been made to make sure frame-pointers are not
  enabled on s390x and ppc64el.

  [Original Description]
  Note: libio-dirent-perl has very old packaging that has not been updated for a while.

  The package can be switched to a modern debhelper version and this
  will allow to make it honour dpkg build flags.

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