do not treat non-symlink reparse points as valid symlinks

Windows 8 and later can create NFS symlinks (within reparse points)
which we were assuming were normal NTFS symlinks and thus reporting
corrupt paths for.  Add check for reparse points to make sure that
they really are normal symlinks before we try to parse the pathname.

We also should not be parsing other types of reparse points (DFS
junctions etc) as if they were a  symlink so return EOPNOTSUPP
on those.  Also fix endian errors (we were not parsing symlink
lengths as little endian).

This fixes commit d244bf2dfbebfded05f494ffd53659fa7b1e32c1
which implemented follow link for non-Unix CIFS mounts

CC: Stable <stable@kernel.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 23 insertions, 8 deletions

diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
index a630475e421c..08f9dfb1a894 100644
--- a/fs/cifs/cifspdu.h
+++ b/fs/cifs/cifspdu.h
@@ -1491,15 +1491,30 @@ struct file_notify_information {
         __u8  FileName[0];
 } __attribute__((packed));
 
-struct reparse_data {
-        __u32   ReparseTag;
-        __u16   ReparseDataLength;
+/* For IO_REPARSE_TAG_SYMLINK */
+struct reparse_symlink_data {
+        __le32  ReparseTag;
+        __le16  ReparseDataLength;
         __u16   Reserved;
-        __u16   SubstituteNameOffset;
-        __u16   SubstituteNameLength;
-        __u16   PrintNameOffset;
-        __u16   PrintNameLength;
-        __u32   Flags;
+        __le16  SubstituteNameOffset;
+        __le16  SubstituteNameLength;
+        __le16  PrintNameOffset;
+        __le16  PrintNameLength;
+        __le32  Flags;
+        char    PathBuffer[0];
+} __attribute__((packed));
+
+/* For IO_REPARSE_TAG_NFS */
+#define NFS_SPECFILE_LNK        0x00000000014B4E4C
+#define NFS_SPECFILE_CHR        0x0000000000524843
+#define NFS_SPECFILE_BLK        0x00000000004B4C42
+#define NFS_SPECFILE_FIFO       0x000000004F464946
+#define NFS_SPECFILE_SOCK       0x000000004B434F53
+struct reparse_posix_data {
+        __le32  ReparseTag;
+        __le16  ReparseDataLength;
+        __u16   Reserved;
+        __le64  InodeType; /* LNK, FIFO, CHR etc. */
         char    PathBuffer[0];
 } __attribute__((packed));