Date: Wed, 12 Jun 1996 22:50:06 -0700 (PDT) From: Ollivier Robert <roberto@keltia.freenix.fr> To: freebsd-bugs Subject: Re: bin/1313: link(8)/unlink(8) Message-ID: <199606130550.WAA20364@freefall.freebsd.org>
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The following reply was made to PR bin/1313; it has been noted by GNATS. From: Ollivier Robert <roberto@keltia.freenix.fr> To: zgabor@code.hu Cc: FreeBSD-gnats-submit@freebsd.org Subject: Re: bin/1313: link(8)/unlink(8) Date: Thu, 13 Jun 1996 00:25:05 +0200 (MET DST) It seems that Zahemszky Gabor said: > >Originator: Zahemszky Gabor > >Organization: > >Release: FreeBSD 2.1.0-RELEASE i386 > >Environment: > > On 2.1R, there's missing the (/etc) /sbin/link and unlink commands. > These command are the most simplified version of the ln/rm commands, > (eg, the ln command denies making a hard link to a directory, but > the link command enables it - for root, of course; the rm/rmdir Hard-linking directories is a no-no and should not be allowed. This "misfeature" has been fixed in CURRENT: peter 96/05/24 09:19:25 Modified: sys/kern vfs_syscalls.c Log: Dont allow directories to be link()ed or unlink()ed, even for root (returns EPERM always, the errno is specified by POSIX). If you really have a desperate need to link or unlink a directory, you can use fsdb. :-) This should stop any chance of ftpd, rdist, "rm -rf", etc from bugging out and damaging the filesystem structure or loosing races with malicious users. -- Ollivier ROBERT -=- The daemon is FREE! -=- roberto@keltia.freenix.fr FreeBSD keltia.freenix.fr 2.2-CURRENT #10: Tue Jun 11 13:36:57 MET DST 1996
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