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    Subject[PATCH v3] fs: add the tuncate check of exfat
    Date
    EXFAT will fill zero data in truncated range.
    Fix this by adding EXFAT_SUPER_MAGIC check.

    Signed-off-by: MIngyi Cong <congmingyi@gmail.com>
    ---
    V1 -> V2: add the truncate check of hfs and remove EXFAT_SUPER_MAGIC in magic.h
    V2 -> V3: remove the truncate check of hfs and hfsplus
    fs/ksmbd/smb2pdu.c | 3 ++-
    include/uapi/linux/magic.h | 1 +
    2 files changed, 3 insertions(+), 1 deletion(-)

    diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
    index 0685c1c77b9f..3f2e34936b8d 100644
    --- a/fs/ksmbd/smb2pdu.c
    +++ b/fs/ksmbd/smb2pdu.c
    @@ -5746,7 +5746,8 @@ static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
    * truncate of some filesystem like FAT32 fill zero data in
    * truncated range.
    */
    - if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC) {
    + if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC ||
    + inode->i_sb->s_magic != EXFAT_SUPER_MAGIC) {
    ksmbd_debug(SMB, "truncated to newsize %lld\n", newsize);
    rc = ksmbd_vfs_truncate(work, fp, newsize);
    if (rc) {
    diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
    index 6325d1d0e90f..309cb3b5c5c4 100644
    --- a/include/uapi/linux/magic.h
    +++ b/include/uapi/linux/magic.h
    @@ -46,6 +46,7 @@

    #define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
    #define EXFAT_SUPER_MAGIC 0x2011BAB0
    +#define HFS_SUPER_MAGIC 0x4244 /* "BD": HFS MDB (super block) */
    #define NCP_SUPER_MAGIC 0x564c /* Guess, what 0x564c is :-) */
    #define NFS_SUPER_MAGIC 0x6969
    #define OCFS2_SUPER_MAGIC 0x7461636f
    --
    2.34.1
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