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

[Launchpad Bug Tracker]

This bug was fixed in the package grep - 3.1-2build1

---------------
grep (3.1-2build1) bionic; urgency=medium

  * No change rebuild. (LP: #1844524)

 -- Tiago Stürmer Daitx <tiago.daitx at ubuntu.com>  Wed, 18 Sep 2019
15:00:16 +0000

** Changed in: grep (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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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:
  Fix Released
Status in grep source package in Bionic:
  Fix Released

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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