Jan wrote:
> Collin Funk <[email protected]> wrote:
> >
> > We can see that uutils 'mkfifo' creates the fifo with world readable and
> > writable permissions and then uses chmod()
> >
> >
> > umask(000) = 002
> > umask(002) = 000
> > mknodat(AT_FDCWD, "/tmp/fifo", S_IFIFO|0666) = 0
>
> Minor difference, and not disputing the race condition
> here, but doesn't this initially yield a fifo with
> mode 664, not 666 due to the umask(002) right before?
>
> Ie., not _world_ writable (although _group_ writable),
> even prior to chmod(2).
Yes, I should have probably adjusted my example:
$ mkfifo --version
mkfifo (uutils coreutils) 0.8.0
$ (umask 0; strace mkfifo -m 700 /tmp/fifo)
[...]
umask(000) = 000
umask(000) = 000
mknodat(AT_FDCWD, "/tmp/fifo", S_IFIFO|0666) = 0
chmod("/tmp/fifo", 0700)
Thanks,
Collin
