Messages in this thread |  | | | Date | Thu, 24 Feb 2000 10:17:55 -0500 (EST) | | From | "Richard B. Johnson" <> | | Subject | Re: permissions not honoured by /bin/pwd aka getcwd |
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On Thu, 24 Feb 2000, Anton Ivanov wrote:
> -----BEGIN PGP SIGNED MESSAGE----- > > > 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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