Date: Tue, 4 May 1999 13:10:03 -0700 (PDT) From: "Przemyslaw Frasunek" <venglin@lagoon.freebsd.org.pl> To: freebsd-bugs@FreeBSD.org Subject: Re: i386/11454: mkdir() and chdir() doesn't check argument lengt Message-ID: <199905042010.NAA16903@freefall.freebsd.org>
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The following reply was made to PR i386/11454; it has been noted by GNATS.
From: "Przemyslaw Frasunek" <venglin@lagoon.freebsd.org.pl>
To: bde@zeta.org.au
Cc: freebsd-gnats-submit@freebsd.org
Subject: Re: i386/11454: mkdir() and chdir() doesn't check argument lengt
Date: Tue, 4 May 1999 20:01:44 CEST
> >>Description:
> > Chdir() and mkdir() doesn't check argument length, so it's possible
> >to create an extremly deep directory structure, on which most system
> >commands won't work.
> chdir() and mkdir() work correctly. They can't reasonably check the
> length of the path to the current directory, and POSIX.1 doesn't
> permit them to fail because the current directory is deep.
Ok, but mkdir() and chdir() manual tells:
ERRORS
Mkdir() (chdir()) will fail and no directory will be created if:
[...]
[ENAMETOOLONG]
A component of a pathname exceeded 255 characters, or
an en- tire path name exceeded 1023 characters.
But it doesn't fail.
> The bugs are in the system commands. In particular, POSIX.2 specifies
> that `find' and `rm -r' shall work for arbitarily deep directories
> (provided directory names longer than PATH_MAX aren't specified on the
> command line), and that `ls -R' should handle arbitrarily deep directories
> (it shouldn't fail unless it runs out of memory for keeping track of
> untraversed directories).
So theoretically I can create directory, on which _all_ system
commands will fail, because they doesn't have enough of memory?
> `find' seems to traverse deep directories correctly. However, the
> following don't work:
> 1) passing long names found by `find' to other utilities.
Overflow occurs, when find tries to print out a long pathname by
invoking puts(). So, I think (but I'm not sure) that it could be
dangerous and should be fixed...
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