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ntfs: reject direct I/O reads of encrypted files

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ntfs_file_read_iter() refuses direct I/O for compressed and WOF
compressed attributes but lets encrypted ones reach iomap_dio_rw().
ntfs_read_iomap_begin_non_resident() has no NInoEncrypted() test, so it
reports IOMAP_MAPPED for the attribute's real clusters and the raw
on-disk ciphertext is copied to the caller.  Buffered reads are refused
by ntfs_read_folio(), but direct I/O never calls it.

Fixes: 9c87959601 ("ntfs: update file operations")
Signed-off-by: Zhan Xusheng <zhanxusheng@xiaomi.com>
Reviewed-by: Baolin Liu <liubaolin@kylinos.cn>
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Zhan Xusheng 2026-10-12 14:20:40 +08:00 committed by Namjae Jeon
parent 5db65a43ed
commit b08619bf3c
1 changed files with 2 additions and 2 deletions
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4
fs/ntfs/file.c
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@ -706,8 +706,8 @@ ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
if (NVolShutdown(NTFS_SB(sb)))
return -EIO;
if ((NInoCompressed(NTFS_I(vi)) || NInoWofCompressed(NTFS_I(vi))) &&
iocb->ki_flags & IOCB_DIRECT)
if ((NInoCompressed(NTFS_I(vi)) || NInoWofCompressed(NTFS_I(vi)) ||
NInoEncrypted(NTFS_I(vi))) && iocb->ki_flags & IOCB_DIRECT)
return -EOPNOTSUPP;
inode_lock_shared(vi);