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[Bug 1386339] Re: cryptswap can fail if random data matches a filesystem magic number

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apport information

** Tags added: apport-collected utopic

** Description changed:

  I noticed that my encrypted swap was not working, and I found that the
  randomly generated encrypted filesystem had randomly generated data that
  had the magic number of a filesystem type, and hence ever more it
  refused to start...
  
  Eg:-
  
  root@hardline:/etc# more /etc/crypttab
  cryptswap1 /dev/sda3 /dev/urandom swap,cipher=aes-cbc-essiv:sha256
  
  root@hardline:/etc# cryptdisks_start cryptswap1
   * Starting crypto disk...                                                       * cryptswap1 (starting)..
   * cryptswap1: the precheck for '/dev/sda3' failed:  - The device /dev/sda3 contains a filesystem type hfsplus.
   * cryptswap1 (failed)...                                                [fail] 
  
  Obviosuly this is not a filesystem:-
  
  root@hardline:/etc# mount -t hfsplus /dev/sda3 /mnt
  mount: wrong fs type, bad option, bad superblock on /dev/sda3,
         missing codepage or helper program, or other error
  
  So I blanked it and restarted, all is now well... perhaps if there's a
  force option on cryptsetup this should be used in the setup scripts:-
  
  root@hardline:/etc# dd if=/dev/zero of=/dev/sda3
  ^C684121+0 records in
  684121+0 records out
  350269952 bytes (350 MB) copied, 5.96378 s, 58.7 MB/s
  
  root@hardline:/etc# cryptdisks_start cryptswap1
   * Starting crypto disk...                                                       * cryptswap1 (starting)..
   * cryptswap1 (started)...                                               [ OK ]
+ --- 
+ ApportVersion: 2.14.7-0ubuntu8
+ Architecture: amd64
+ AudioDevicesInUse:
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  james      3650 F.... pulseaudio
+  /dev/snd/controlC1:  james      3650 F.... pulseaudio
+ DistroRelease: Ubuntu 14.10
+ EcryptfsInUse: Yes
+ InstallationDate: Installed on 2014-04-28 (182 days ago)
+ InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
+ MachineType: LENOVO 20266
+ Package: linux (not installed)
+ ProcEnviron:
+  LANGUAGE=en_GB:en
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=en_GB.UTF-8
+  SHELL=/bin/bash
+ ProcFB: 0 inteldrmfb
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic.efi.signed root=UUID=1cbc95ee-97a4-4869-b1a2-135f351313eb ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
+ ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
+ PulseList:
+  Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
+  No PulseAudio daemon running, or not running as session daemon.
+ RelatedPackageVersions:
+  linux-restricted-modules-3.16.0-23-generic N/A
+  linux-backports-modules-3.16.0-23-generic  N/A
+  linux-firmware                             1.138
+ Tags:  utopic
+ Uname: Linux 3.16.0-23-generic x86_64
+ UpgradeStatus: Upgraded to utopic on 2014-10-14 (13 days ago)
+ UserGroups:
+  
+ _MarkForUpload: True
+ dmi.bios.date: 10/31/2013
+ dmi.bios.vendor: LENOVO
+ dmi.bios.version: 76CN31WW
+ dmi.board.asset.tag: No Asset Tag
+ dmi.board.name: Yoga2
+ dmi.board.vendor: LENOVO
+ dmi.board.version: 31900058STD
+ dmi.chassis.asset.tag: No Asset Tag
+ dmi.chassis.type: 10
+ dmi.chassis.vendor: LENOVO
+ dmi.chassis.version: Lenovo Yoga 2 Pro
+ dmi.modalias: dmi:bvnLENOVO:bvr76CN31WW:bd10/31/2013:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
+ dmi.product.name: 20266
+ dmi.product.version: Lenovo Yoga 2 Pro
+ dmi.sys.vendor: LENOVO

** Attachment added: "AlsaInfo.txt"
   https://bugs.launchpad.net/bugs/1386339/+attachment/4247003/+files/AlsaInfo.txt

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https://bugs.launchpad.net/bugs/1386339

Title:
  cryptswap can fail if random data matches a filesystem magic number

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I noticed that my encrypted swap was not working, and I found that the
  randomly generated encrypted filesystem had randomly generated data
  that had the magic number of a filesystem type, and hence ever more it
  refused to start...

  Eg:-

  root@hardline:/etc# more /etc/crypttab
  cryptswap1 /dev/sda3 /dev/urandom swap,cipher=aes-cbc-essiv:sha256

  root@hardline:/etc# cryptdisks_start cryptswap1
   * Starting crypto disk...                                                       * cryptswap1 (starting)..
   * cryptswap1: the precheck for '/dev/sda3' failed:  - The device /dev/sda3 contains a filesystem type hfsplus.
   * cryptswap1 (failed)...                                                [fail] 

  Obviosuly this is not a filesystem:-

  root@hardline:/etc# mount -t hfsplus /dev/sda3 /mnt
  mount: wrong fs type, bad option, bad superblock on /dev/sda3,
         missing codepage or helper program, or other error

  So I blanked it and restarted, all is now well... perhaps if there's a
  force option on cryptsetup this should be used in the setup scripts:-

  root@hardline:/etc# dd if=/dev/zero of=/dev/sda3
  ^C684121+0 records in
  684121+0 records out
  350269952 bytes (350 MB) copied, 5.96378 s, 58.7 MB/s

  root@hardline:/etc# cryptdisks_start cryptswap1
   * Starting crypto disk...                                                       * cryptswap1 (starting)..
   * cryptswap1 (started)...                                               [ OK ]
  --- 
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  james      3650 F.... pulseaudio
   /dev/snd/controlC1:  james      3650 F.... pulseaudio
  DistroRelease: Ubuntu 14.10
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-04-28 (182 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20266
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic.efi.signed root=UUID=1cbc95ee-97a4-4869-b1a2-135f351313eb ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-23-generic N/A
   linux-backports-modules-3.16.0-23-generic  N/A
   linux-firmware                             1.138
  Tags:  utopic
  Uname: Linux 3.16.0-23-generic x86_64
  UpgradeStatus: Upgraded to utopic on 2014-10-14 (13 days ago)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 10/31/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 76CN31WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Yoga2
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga 2 Pro
  dmi.modalias: dmi:bvnLENOVO:bvr76CN31WW:bd10/31/2013:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
  dmi.product.name: 20266
  dmi.product.version: Lenovo Yoga 2 Pro
  dmi.sys.vendor: LENOVO

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References

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