[Bug 1905393] Re: Ubuntu 20.04: opal-prd fails to start on 20.04

[Matthieu Clemenceau]

** Patch added: "This is a debdiff for the Focal SRU"
   https://bugs.launchpad.net/ubuntu-power-systems/+bug/1905393/+attachment/5443552/+files/skiboot_6.5.2-1_6.5.2-1ubuntu0.20.04.1.diff

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Title:
  Ubuntu 20.04: opal-prd fails to start on 20.04

Status in The Ubuntu-power-systems project:
  In Progress
Status in skiboot package in Ubuntu:
  In Progress
Status in skiboot source package in Focal:
  In Progress
Status in skiboot source package in Groovy:
  In Progress
Status in skiboot source package in Hirsute:
  In Progress

Bug description:
  == Comment: #0 - VASANT HEGDE <hegdevasant at in.ibm.com> - 2020-11-23 23:23:22 ==
  ---Problem Description---
  opal-prd fails to start on 20.04
   
  Contact Information = Vasant hegde <hegdevasant at linux.vnet.ibm.com>
   
  ---uname output---
  Ubuntu 20.04
   
  Machine Type = All Power System 
   
  ---Steps to Reproduce---
   opal-prd fails to start on 20.04
   
  Userspace tool common name: opal-prd 
   
  The userspace tool has the following bit modes: 64bit 

  Userspace rpm: opal-prd

  This is fixed in upstream by below commit. Please backport this patch
  to 20.04 LTS release. Also applicable for 20.10.

  commit 47005e8d4c9aeda5826c17c4a013cfbda1a3f2de
  Author: Georgy Yakovlev <gyakovlev at gentoo.org>
  Date:   Mon Oct 12 14:29:17 2020 -0700

      opal-prd: handle devtmpfs mounted with noexec
      
      On systems using recent versions of systemd /dev (devtmpfs) is mounted with
      noexec option. Such mount prevents mapping HBRT image code region as RWX
      from /dev. This commit, as suggested in github PR linked below, attempts to
      work around the situation by copying HBRT image to anon mmaped memory
      region and sets mprotect rwx on it, allowing opal-prd to sucessfully
      execute the code region.
      
      Having memory region set as RWX is not ideal for security, but fixing that
      is a separate and hard to solve problem. Original code also mmaped region
      as RWX, so this PR does not make things worse at least.
      
      Closes: https://github.com/open-power/skiboot/issues/258
      Signed-off-by: Georgy Yakovlev <gyakovlev at gentoo.org>
      Reviewed-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
      [oliver: whitespace fix, add a comment, reflow commit message]
      Signed-off-by: Oliver O'Halloran <oohall at gmail.com>

  -Vasant

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