linux/fs/udf
Steven J. Magnani 70f19f5869 udf: Don't corrupt unalloc spacetable when writing it
For a UDF filesystem configured with an Unallocated Space Table,
a filesystem operation that triggers an update to the table results
in on-disk corruption that prevents remounting:

  udf_read_tagged: tag version 0x0000 != 0x0002 || 0x0003, block 274

For example:
  1. Create a filesystem
      $ mkudffs --media-type=hd --blocksize=512 --lvid=BUGTEST \
              --vid=BUGTEST --fsid=BUGTEST --space=unalloctable \
              /dev/mmcblk0

  2. Mount it
      # mount /dev/mmcblk0 /mnt

  3. Create a file
      $ echo "No corruption, please" > /mnt/new.file

  4. Umount
      # umount /mnt

  5. Attempt remount
      # mount /dev/mmcblk0 /mnt

This appears to be a longstanding bug caused by zero-initialization of
the Unallocated Space Entry block buffer and only partial repopulation
of required fields before writing to disk.

Commit 0adfb339fd64 ("udf: Fix unalloc space handling in udf_update_inode")
addressed one such field, but several others are required.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Jan Kara <jack@suse.com>
2015-07-09 16:38:57 +02:00
..
Kconfig udf: Update Kconfig description 2015-01-05 11:04:37 +01:00
Makefile switch udf to simple_fsync() 2009-06-11 21:36:13 -04:00
balloc.c udf: use int for allocated blocks instead of sector_t 2015-03-16 08:24:16 +01:00
dir.c udf: Make udf_get_filename() return error instead of 0 length file name 2015-05-18 11:23:06 +02:00
directory.c udf: remove redundant buffer_head.h includes 2015-03-14 07:54:02 +01:00
ecma_167.h Remove struct typedefs from fs/udf/ecma_167.h et al. 2009-04-02 12:29:47 +02:00
file.c udf: remove double err declaration in udf_file_write_iter() 2015-05-18 11:23:09 +02:00
ialloc.c udf: saner calling conventions for udf_new_inode() 2014-09-04 21:37:41 +02:00
inode.c udf: Don't corrupt unalloc spacetable when writing it 2015-07-09 16:38:57 +02:00
lowlevel.c udf: use linux/uaccess.h 2014-07-15 22:40:23 +02:00
misc.c udf: remove redundant buffer_head.h includes 2015-03-14 07:54:02 +01:00
namei.c UDF: support NFSv2 export 2015-05-18 11:23:08 +02:00
osta_udf.h Remove struct typedefs from fs/udf/ecma_167.h et al. 2009-04-02 12:29:47 +02:00
partition.c udf: remove redundant buffer_head.h includes 2015-03-14 07:54:02 +01:00
super.c udf: fix udf_load_pvoldesc() 2015-05-21 15:19:15 +02:00
symlink.c udf: Return -ENOMEM when allocation fails in udf_get_filename() 2015-05-18 11:23:03 +02:00
truncate.c udf: remove redundant buffer_head.h includes 2015-03-14 07:54:02 +01:00
udf_i.h fs: cleanup slight list_entry abuse 2015-06-23 18:01:59 -04:00
udf_sb.h udf: Fortify LVID loading 2013-09-24 11:23:33 +02:00
udfdecl.h udf: Check path length when reading symlink 2014-12-19 14:12:08 +01:00
udfend.h Remove struct typedefs from fs/udf/ecma_167.h et al. 2009-04-02 12:29:47 +02:00
udftime.c udf: remove redundant sys_tz declaration 2014-09-29 13:45:12 +02:00
unicode.c udf: Make udf_get_filename() return error instead of 0 length file name 2015-05-18 11:23:06 +02:00