bug in permissions after mkdir -p -m

[Bert Gijsbers]

Hi,

There is a security bug in mkdir when using the -m and -p options.
If I do this:

    cd /tmp
    umask 0
    rm -rf a
    mkdir -p -m 0755 a/b/c
    ls -ld a a/b a/b/c

then I get this:

drwxrwxrwx    3 gijsbers users        1024 Apr 25 13:53 a
drwxrwxrwx    3 gijsbers users        1024 Apr 25 13:53 a/b
drwxr-xr-x    2 gijsbers users        1024 Apr 25 13:53 a/b/c

I expected to get this:

drwxr-xr-x    3 gijsbers users        1024 Apr 25 13:53 a
drwxr-xr-x    3 gijsbers users        1024 Apr 25 13:53 a/b
drwxr-xr-x    2 gijsbers users        1024 Apr 25 13:53 a/b/c


Bert