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>
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Родитель
45820c294f
Коммит
70f19f5869
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@ -1652,17 +1652,9 @@ static int udf_update_inode(struct inode *inode, int do_sync)
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iinfo->i_ext.i_data, inode->i_sb->s_blocksize -
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sizeof(struct unallocSpaceEntry));
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use->descTag.tagIdent = cpu_to_le16(TAG_IDENT_USE);
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use->descTag.tagLocation =
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cpu_to_le32(iinfo->i_location.logicalBlockNum);
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crclen = sizeof(struct unallocSpaceEntry) +
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iinfo->i_lenAlloc - sizeof(struct tag);
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use->descTag.descCRCLength = cpu_to_le16(crclen);
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use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
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sizeof(struct tag),
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crclen));
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use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
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crclen = sizeof(struct unallocSpaceEntry);
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goto out;
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goto finish;
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}
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if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_UID_FORGET))
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@ -1782,6 +1774,8 @@ static int udf_update_inode(struct inode *inode, int do_sync)
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efe->descTag.tagIdent = cpu_to_le16(TAG_IDENT_EFE);
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crclen = sizeof(struct extendedFileEntry);
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}
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finish:
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if (iinfo->i_strat4096) {
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fe->icbTag.strategyType = cpu_to_le16(4096);
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fe->icbTag.strategyParameter = cpu_to_le16(1);
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@ -1791,7 +1785,9 @@ static int udf_update_inode(struct inode *inode, int do_sync)
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fe->icbTag.numEntries = cpu_to_le16(1);
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}
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if (S_ISDIR(inode->i_mode))
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if (iinfo->i_use)
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fe->icbTag.fileType = ICBTAG_FILE_TYPE_USE;
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else if (S_ISDIR(inode->i_mode))
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fe->icbTag.fileType = ICBTAG_FILE_TYPE_DIRECTORY;
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else if (S_ISREG(inode->i_mode))
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fe->icbTag.fileType = ICBTAG_FILE_TYPE_REGULAR;
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@ -1828,7 +1824,6 @@ static int udf_update_inode(struct inode *inode, int do_sync)
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crclen));
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fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
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out:
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set_buffer_uptodate(bh);
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unlock_buffer(bh);
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