[Bug 1908438] [NEW] When specifying wrong syntax in sudoers.d include files sudo throws a segmentation fault

[Jacobus Erasmus]

Public bug reported:

I made a mistake and used a relative rather than absolute path to the
application:

The following file placed in the /etc/sudoers.d causes a segmentation
fault in when and sudo command is run.

/etc/sudoers.d/reset_database

#Allows reset_database to be called as user jacobus
jacobus ALL=NOPASSWD: systemctl stop freeradius
jacobus ALL=NOPASSWD: systemctl start freeradius
jacobus ALL=NOPASSWD: systemctl restart postgresql

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: sudo 1.9.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.8.0-33.36-generic 5.8.17
Uname: Linux 5.8.0-33-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Dec 16 22:19:05 2020
InstallationDate: Installed on 2019-06-04 (561 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: sudo
UpgradeStatus: Upgraded to groovy on 2020-10-25 (52 days ago)
VisudoCheck:
 Error: command ['pkexec', '/usr/sbin/visudo', '-c'] failed with exit code 1: /etc/sudoers.d/reset_database: bad permissions, should be mode 0440
 /etc/sudoers: parsed OK
 /etc/sudoers.d/README: parsed OK
 /etc/sudoers.d/cephadm: parsed OK
 /etc/sudoers.d/openfortigui: parsed OK
modified.conffile..etc.sudoers: [inaccessible: [Errno 13] Permission denied: '/etc/sudoers']
modified.conffile..etc.sudoers.d.README: [inaccessible: [Errno 13] Permission denied: '/etc/sudoers.d/README']

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


** Tags: amd64 apport-bug groovy

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https://bugs.launchpad.net/bugs/1908438

Title:
  When specifying wrong syntax in sudoers.d include files sudo throws a
  segmentation fault

Status in sudo package in Ubuntu:
  New

Bug description:
  I made a mistake and used a relative rather than absolute path to the
  application:

  The following file placed in the /etc/sudoers.d causes a segmentation
  fault in when and sudo command is run.

  /etc/sudoers.d/reset_database

  #Allows reset_database to be called as user jacobus
  jacobus ALL=NOPASSWD: systemctl stop freeradius
  jacobus ALL=NOPASSWD: systemctl start freeradius
  jacobus ALL=NOPASSWD: systemctl restart postgresql

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: sudo 1.9.1-1ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-33.36-generic 5.8.17
  Uname: Linux 5.8.0-33-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Dec 16 22:19:05 2020
  InstallationDate: Installed on 2019-06-04 (561 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  SourcePackage: sudo
  UpgradeStatus: Upgraded to groovy on 2020-10-25 (52 days ago)
  VisudoCheck:
   Error: command ['pkexec', '/usr/sbin/visudo', '-c'] failed with exit code 1: /etc/sudoers.d/reset_database: bad permissions, should be mode 0440
   /etc/sudoers: parsed OK
   /etc/sudoers.d/README: parsed OK
   /etc/sudoers.d/cephadm: parsed OK
   /etc/sudoers.d/openfortigui: parsed OK
  modified.conffile..etc.sudoers: [inaccessible: [Errno 13] Permission denied: '/etc/sudoers']
  modified.conffile..etc.sudoers.d.README: [inaccessible: [Errno 13] Permission denied: '/etc/sudoers.d/README']

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