Date: Mon, 18 Sep 1995 01:06:48 -0700 (PDT) From: Julian Elischer <julian@ref.tfs.com> To: julian@ref.tfs.com (Julian Elischer) Cc: hackers@freebsd.org Subject: Re: suspect code in 'unlink' syscall. Message-ID: <199509180806.BAA01219@ref.tfs.com> In-Reply-To: <199509180750.AAA01170@ref.tfs.com> from "Julian Elischer" at Sep 18, 95 00:50:32 am
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>
> looking at 'unlink (2)'
> I see,
> if (vp->v_type != VDIR ||
> (error = suser(p->p_ucred, &p->p_acflag)) == 0) {
> /*
> * The root of a mounted filesystem cannot be deleted.
> */
> if (vp->v_flag & VROOT)
> error = EBUSY;
> else
> (void) vnode_pager_uncache(vp);
> }
>
> I translate this as:
> "if it's not a DIR, or we are root",
> check if we are deleteing the
> root of an FS,
> if not, flush cache......
>
> now, if we were NOT root, and it IS a dir...... (normal...)
>
> can we delete it?
The answer is 'NO' but I'm not sure I see why..
AH I just found it.. only root can unlink a dir, all others can
only do 'rmdir' calls.. ok, I admit it.. I need to go to sleep.
> I'm about to try this..
> if you don't hear from me, the building exploded...
It didn't
>
> julian :)
>
>
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