[Bug 1719720] Re: [LTCTest][libvpd] Process '/bin/touch /run/run.vpdupdate' failed with exit code 127

[Steve Langasek]

'MemoryDenyWriteExecute=yes' is defined in systemd.exec(5) as:

If set, attempts to create memory mappings that are writable and
executable at the same time, or to change existing memory mappings to
become executable, or mapping shared memory segments as executable are
prohibited. Specifically, a system call filter is added that rejects
mmap(2) system calls with both PROT_EXEC and PROT_WRITE set, mprotect(2)
system calls with PROT_EXEC set and shmat(2) system calls with SHM_EXEC
set.

It is surprising that /bin/touch should trip this check.  This will
require investigation.

** Package changed: systemd (Ubuntu) => coreutils (Ubuntu)

** Changed in: coreutils (Ubuntu)
       Status: New => Triaged

** Changed in: coreutils (Ubuntu)
   Importance: Undecided => High

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Title:
  [LTCTest][libvpd] Process '/bin/touch /run/run.vpdupdate' failed with
  exit code 127

Status in The Ubuntu-power-systems project:
  New
Status in coreutils package in Ubuntu:
  Triaged

Bug description:
  ---Problem Description---
  Currently syslog is getting flooded with below log messages ..
  Sep 25 03:16:41 ubuntu1710 systemd-udevd[2654]: Process '/bin/touch /run/run.vpdd
  update' failed with exit code 127.

  This is on UBuntu 17.10 latest build.. 
   
  ---uname output---
  Linux ubuntu1710 4.12.0-11-generic #12-Ubuntu SMP Fri Aug 11 12:23:06 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
   
  Machine Type = ZZ-L 
    
  ---Steps to Reproduce---
   I have seen these messages logged more often when we do any hotplug operations.. ex. cpu hotplug..

  Ok. .this is the continuation of LTC #144627 / Launchpad #1682774.

  As suggested in that bug, we did change udev script to create
  temporary file under /run and that patch is available in ubuntu 17.10.

  Looks like this is udev script issue. If I modify systemd-udevd like
  below it works fine.

  I've limited udev knowledge. I don't know if you have any other better
  solution to this issue.

  root at ltc-boston123:/lib/systemd/system# diff -Naurp  systemd-udevd.service.org systemd-udevd.service
  --- systemd-udevd.service.org	2017-09-26 04:37:47.090057318 -0500
  +++ systemd-udevd.service	2017-09-26 04:37:55.381739372 -0500
  @@ -25,7 +25,7 @@ KillMode=mixed
   WatchdogSec=3min
   TasksMax=infinity
   MountFlags=slave
  -MemoryDenyWriteExecute=yes
  +#MemoryDenyWriteExecute=yes
   RestrictRealtime=yes
   RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
   SystemCallArchitectures=native

  
  -Vasant

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