From: Steven J. Magnani steve.magnani@digidescorp.com
[ Upstream commit ab9a3a737284b3d9e1d2ba43a0ef31b3ef2e2417 ]
Windows is capable of creating UDF files having named streams. One example is the "Zone.Identifier" stream attached automatically to files downloaded from a network. See: https://msdn.microsoft.com/en-us/library/dn392609.aspx
Modification of a file having one or more named streams in Linux causes the stream directory to become detached from the file, essentially leaking all blocks pertaining to the file's streams.
Fix by saving off information about an inode's streams when reading it, for later use when its on-disk data is updated.
Link: https://lore.kernel.org/r/20190814125002.10869-1-steve@digidescorp.com Signed-off-by: Steven J. Magnani steve@digidescorp.com Signed-off-by: Jan Kara jack@suse.cz Stable-dep-of: fc8033a34a3c ("udf: Preserve link count of system files") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/udf/inode.c | 24 +++++++++++++++++++++++- fs/udf/super.c | 2 ++ fs/udf/udf_i.h | 5 ++++- 3 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/fs/udf/inode.c b/fs/udf/inode.c index af1180104e560..99d297b667ce1 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -1470,6 +1470,8 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode) iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr); iinfo->i_lenAlloc = le32_to_cpu(fe->lengthAllocDescs); iinfo->i_checkpoint = le32_to_cpu(fe->checkpoint); + iinfo->i_streamdir = 0; + iinfo->i_lenStreams = 0; } else { inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << (inode->i_sb->s_blocksize_bits - 9); @@ -1483,6 +1485,16 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode) iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr); iinfo->i_lenAlloc = le32_to_cpu(efe->lengthAllocDescs); iinfo->i_checkpoint = le32_to_cpu(efe->checkpoint); + + /* Named streams */ + iinfo->i_streamdir = (efe->streamDirectoryICB.extLength != 0); + iinfo->i_locStreamdir = + lelb_to_cpu(efe->streamDirectoryICB.extLocation); + iinfo->i_lenStreams = le64_to_cpu(efe->objectSize); + if (iinfo->i_lenStreams >= inode->i_size) + iinfo->i_lenStreams -= inode->i_size; + else + iinfo->i_lenStreams = 0; } inode->i_generation = iinfo->i_unique;
@@ -1745,9 +1757,19 @@ static int udf_update_inode(struct inode *inode, int do_sync) iinfo->i_ext.i_data, inode->i_sb->s_blocksize - sizeof(struct extendedFileEntry)); - efe->objectSize = cpu_to_le64(inode->i_size); + efe->objectSize = + cpu_to_le64(inode->i_size + iinfo->i_lenStreams); efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded);
+ if (iinfo->i_streamdir) { + struct long_ad *icb_lad = &efe->streamDirectoryICB; + + icb_lad->extLocation = + cpu_to_lelb(iinfo->i_locStreamdir); + icb_lad->extLength = + cpu_to_le32(inode->i_sb->s_blocksize); + } + udf_adjust_time(iinfo, inode->i_atime); udf_adjust_time(iinfo, inode->i_mtime); udf_adjust_time(iinfo, inode->i_ctime); diff --git a/fs/udf/super.c b/fs/udf/super.c index 5d179616578cf..ec082b27e9fba 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -146,9 +146,11 @@ static struct inode *udf_alloc_inode(struct super_block *sb)
ei->i_unique = 0; ei->i_lenExtents = 0; + ei->i_lenStreams = 0; ei->i_next_alloc_block = 0; ei->i_next_alloc_goal = 0; ei->i_strat4096 = 0; + ei->i_streamdir = 0; init_rwsem(&ei->i_data_sem); ei->cached_extent.lstart = -1; spin_lock_init(&ei->i_extent_cache_lock); diff --git a/fs/udf/udf_i.h b/fs/udf/udf_i.h index 2ef0e212f08a3..00d773d1b7cf0 100644 --- a/fs/udf/udf_i.h +++ b/fs/udf/udf_i.h @@ -42,12 +42,15 @@ struct udf_inode_info { unsigned i_efe : 1; /* extendedFileEntry */ unsigned i_use : 1; /* unallocSpaceEntry */ unsigned i_strat4096 : 1; - unsigned reserved : 26; + unsigned i_streamdir : 1; + unsigned reserved : 25; union { struct short_ad *i_sad; struct long_ad *i_lad; __u8 *i_data; } i_ext; + struct kernel_lb_addr i_locStreamdir; + __u64 i_lenStreams; struct rw_semaphore i_data_sem; struct udf_ext_cache cached_extent; /* Spinlock for protecting extent cache */