6.6-stable review patch. If anyone has any objections, please let me know.
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From: Steve French stfrench@microsoft.com
commit 2f3017e7cc7515e0110a3733d8dca84de2a1d23d upstream.
Commands like "chmod 0444" mark a file readonly via the attribute flag (when mapping of mode bits into the ACL are not set, or POSIX extensions are not negotiated), but they were not reported correctly for stat of directories (they were reported ok for files and for "ls"). See example below:
root:~# ls /mnt2 -l total 12 drwxr-xr-x 2 root root 0 Sep 21 18:03 normaldir -rwxr-xr-x 1 root root 0 Sep 21 23:24 normalfile dr-xr-xr-x 2 root root 0 Sep 21 17:55 readonly-dir -r-xr-xr-x 1 root root 209716224 Sep 21 18:15 readonly-file root:~# stat -c %a /mnt2/readonly-dir 755 root:~# stat -c %a /mnt2/readonly-file 555
This fixes the stat of directories when ATTR_READONLY is set (in cases where the mode can not be obtained other ways).
root:~# stat -c %a /mnt2/readonly-dir 555
Cc: stable@vger.kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/smb/client/inode.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-)
--- a/fs/smb/client/inode.c +++ b/fs/smb/client/inode.c @@ -779,10 +779,6 @@ static void cifs_open_info_to_fattr(stru fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode; fattr->cf_dtype = DT_REG;
- /* clear write bits if ATTR_READONLY is set */ - if (fattr->cf_cifsattrs & ATTR_READONLY) - fattr->cf_mode &= ~(S_IWUGO); - /* * Don't accept zero nlink from non-unix servers unless * delete is pending. Instead mark it as unknown. @@ -795,6 +791,10 @@ static void cifs_open_info_to_fattr(stru } }
+ /* clear write bits if ATTR_READONLY is set */ + if (fattr->cf_cifsattrs & ATTR_READONLY) + fattr->cf_mode &= ~(S_IWUGO); + out_reparse: if (S_ISLNK(fattr->cf_mode)) { if (likely(data->symlink_target)) @@ -1212,11 +1212,14 @@ handle_mnt_opt: __func__, rc); goto out; } - } - - /* fill in remaining high mode bits e.g. SUID, VTX */ - if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) + } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) + /* fill in remaining high mode bits e.g. SUID, VTX */ cifs_sfu_mode(fattr, full_path, cifs_sb, xid); + else if (!(tcon->posix_extensions)) + /* clear write bits if ATTR_READONLY is set */ + if (fattr->cf_cifsattrs & ATTR_READONLY) + fattr->cf_mode &= ~(S_IWUGO); +
/* check for Minshall+French symlinks */ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {