On Thu, 24 Feb 2000, Anton Ivanov wrote:
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>
>
> On 24-Feb-2000 Richard B. Johnson wrote:
> > On Thu, 24 Feb 2000, Harald Kirsch wrote:
> >
> >> On Thu, Feb 24, 2000 at 08:18:17AM -0500, Richard B. Johnson wrote:
> >> > On Thu, 24 Feb 2000, Harald Kirsch wrote:
> >> > > Why is /bin/pwd (or getcwd) allowed to return an output in the following
> >> > > command sequence?
> >> > >
> >> > >
> >> > > % mkdir -p really/closed; cd really/closed; chmod 000 ..; /bin/pwd
> >> > > /home1_phys/kir/sunHome/tmp/really/closed
> >> > >
> >> > > Harald Kirsch
> >> >
> >> > Because permissions don't prevent you from reading a directory.
> >>
> >> Strange answer. What is `chmod a-r some/directory' good for if not to
> >> forbid reading a directory?
> >>
> >> Harald Kirsch
> >
> > If prevents non-root from reading (i.e. entering) the directory. You
> > are never going to hide the directory contents from root.
> >
> > Here is a non-root user:
> >
> > Script started on Thu Feb 24 09:07:10 2000
> > $ pwd
> > /tmp
> > $ mkdir foo
> > $ mkdir foo/bat
> > $ ls
> > foo typescript
> > $ ls foo/*
> > $ cd foo
> > $ ls
> > bat
> > $ cd ..
> > $ ls
> > foo typescript
> > $ chmod 0 foo
> > $ ls
> > foo typescript
> > $ cd foo
> > bash: foo: Permission denied
> > $ ls foo/*
> > ls: foo/*: Permission denied
> > $ exit
> > exit
> >
> > Script done on Thu Feb 24 09:08:37 2000
>
> Richard, I think the question is different. It is not root vs user.
>
> It is the behaviour of linux pwd. It does not go over the directory tree like
> solaris pwd and others. It reads '.' and prints it. F.e. sol reads and tries to
> resolve symlinks. And bummers.
>
> Try the following:
>
> mkdir -p /tmp/crap/crap1 ; ln -s /tmp/crap /tmp/crap2 ; cd /tmp/crap2/crap1 ;
> pwd
>
> on linux it returns /tmp/crap2/crap1
> on solaris it returns /tmp/crap/crap1
>
> If permissions on crap are 000 solaris bummersm, linux does not. This is on
> debian-potato and sol 2.6 respectively.
>
> And this is gnu fileutils not linux as such.
>
> In btw1: at least in some slackware (2.?) long ago pwd was working properly if
> sol's behaviour is considered proper.
>
> P.S. Harald, excuse me for the hasty answer off the list. I did not think
> properly first.
>
> Cheers ;-)
>
Okay. I goofed. I saw the "%" and thought it was "#". My non-root
guys print "$" for the basic prompt. Other answers in this thread
seem to show that the directory is not re-read for 'pwd' since
the current directory is already known.
I don't know if this is the correct behavior. Checks with my Sun
show that it is certainly different.
Cheers,
Dick Johnson
Penguin : Linux version 2.3.41 on an i686 machine (800.63 BogoMips).
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