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

[Thadeu Lima de Souza Cascardo]

Public bug reported:

[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.

** Affects: grep (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: grep (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Also affects: grep (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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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:
  New
Status in grep source package in Bionic:
  New

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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