[Bug 1844524] Re: text relocation of grep prevents its use under udevd

[Thadeu Lima de Souza Cascardo]

root at lewis:~# dpkg -s grep | grep Version
Version: 3.1-2build1
root at lewis:~# systemd-run -t --property MemoryDenyWriteExecute=yes grep -i crashkernel= /proc/cmdline
Running as unit: run-u73.service
Press ^] three times within 1s to disconnect TTY.
root=UUID=b995e70a-9241-4f98-b451-b3ecc7fa990c ro console=hvc0 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
root at lewis:~# 

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

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https://bugs.launchpad.net/bugs/1844524

Title:
  text relocation of grep prevents its use under udevd

Status in grep package in Ubuntu:
  Invalid
Status in grep source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  grep can't be used under udev, preventing kdump-tools to be used after a memory hotplug.

  [Test case]
  Run grep with systemd-run -t --property MemoryDenyWriteExecute=yes /bin/grep crashkernel /proc/cmdline

  [Regression potential]
  The fix is a simple rebuild, so should have minimal potential for regression.

  
  -------------------------

  # systemd-run -t --property MemoryDenyWriteExecute=yes /bin/grep crashkernel /proc/cmdline
  Running as unit: run-u54.service
  Press ^] three times within 1s to disconnect TTY.
  /bin/grep: error while loading shared libraries: cannot restore segment prot after reloc: Operation not permitted
  #

  Under ppc64el, grep can't be used under udev, because it restricts
  mapping to be Write+Execute, with MemoryDenyWriteExecute=yes. A
  rebuild of grep under bionic fixes the issue.

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