if you want to know which are the default permissions for the /tmp directory in linux you will find the information contained in this post useful, why? because the default permissions are 1777

for example, if you want to know the output of this command:

# ls -ld /tmp

you might get something like this:

OUTPUT:
drwxrwxrwt 4 root root 16384 Mar 21 19:47 /tmp

NOTE: the sticky bit is set to 1777

hope that helps