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[Qemu-devel] [Bug 1599539] [NEW] 2.6.0: vvfat driver generates bad FAT e


From: felix
Subject: [Qemu-devel] [Bug 1599539] [NEW] 2.6.0: vvfat driver generates bad FAT entries
Date: Wed, 06 Jul 2016 14:32:09 -0000

Public bug reported:

The vvfat driver sometimes generates entries about which file system
checking utilities generate complaints.

For example, dosfsck will complain that the volume label entry has non-
zero size. ScanDisk from Windows 9x complains about invalid dot (".")
and dot-dot ("..") entries in directories and also about invalid long
file name entries. MS-DOS ScanDisk also often manages to find "lost
clusters" on the drive.

Tangentially: qemu-img convert fat:test test.img doesn't seem to work --
it generates an 504MiB of zero bytes and hangs. qemu-img map fat:test
generates an assertion failure. Having qemu-img working might have
helped with debugging the above issue.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1599539

Title:
  2.6.0: vvfat driver generates bad FAT entries

Status in QEMU:
  New

Bug description:
  The vvfat driver sometimes generates entries about which file system
  checking utilities generate complaints.

  For example, dosfsck will complain that the volume label entry has
  non-zero size. ScanDisk from Windows 9x complains about invalid dot
  (".") and dot-dot ("..") entries in directories and also about invalid
  long file name entries. MS-DOS ScanDisk also often manages to find
  "lost clusters" on the drive.

  Tangentially: qemu-img convert fat:test test.img doesn't seem to work
  -- it generates an 504MiB of zero bytes and hangs. qemu-img map
  fat:test generates an assertion failure. Having qemu-img working might
  have helped with debugging the above issue.

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