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>

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 6afac3d561ac81f6f5861f86a0dc4eb2a7d1fca2..8d0b3ade0ff0ef8a65f8714330a3bfd49201c0d8 100644 (file)
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1652,17 +1652,9 @@ static int udf_update_inode(struct inode *inode, int do_sync)
                       iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
                                        sizeof(struct unallocSpaceEntry));
                use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
-               use->descTag.tagLocation =
-                               cpu_to_le32(iinfo->i_location.logicalBlockNum);
-               crclen = sizeof(struct unallocSpaceEntry) +
-                               iinfo->i_lenAlloc - sizeof(struct tag);
-               use->descTag.descCRCLength = cpu_to_le16(crclen);
-               use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
-                                                          sizeof(struct tag),
-                                                          crclen));
-               use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
+               crclen = sizeof(struct unallocSpaceEntry);
 
-               goto out;
+               goto finish;
        }
 
        if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
@@ -1782,6 +1774,8 @@ static int udf_update_inode(struct inode *inode, int do_sync)
                efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
                crclen = sizeof(struct extendedFileEntry);
        }
+
+finish:
        if (iinfo->i_strat4096) {
                fe->icbTag.strategyType = cpu_to_le16(4096);
                fe->icbTag.strategyParameter = cpu_to_le16(1);
@@ -1791,7 +1785,9 @@ static int udf_update_inode(struct inode *inode, int do_sync)
                fe->icbTag.numEntries = cpu_to_le16(1);
        }
 
-       if (S_ISDIR(inode->i_mode))
+       if (iinfo->i_use)
+               fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
+       else if (S_ISDIR(inode->i_mode))
                fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
        else if (S_ISREG(inode->i_mode))
                fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
@@ -1828,7 +1824,6 @@ static int udf_update_inode(struct inode *inode, int do_sync)
                                                  crclen));
        fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
 
-out:
        set_buffer_uptodate(bh);
        unlock_buffer(bh);