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From: jms@cs.vu.nl (Jan-Mark)
Newsgroups: comp.os.minix
Subject: Re: search permission on directories
Message-ID: <7282@star.cs.vu.nl>
Date: 10 Aug 90 13:46:22 GMT
References: <454@alice.marco.UUCP>
Sender: news@cs.vu.nl
Reply-To: jms@cs.vu.nl (Jan-Mark Wams)
Organization: VU Dept. of Computer Science, Amsterdam, The Netherlands
Lines: 25

In an article, leo@marco.UUCP (Matthias Pfaller) writes:

> Yesterday I noticed, that even root does not have search permissions
> on directories with mode d---------. Today I tried it on a real unix
> box and here it is allowd. Bug or feature?

	This should be a bug. The origin isn't hard to gess. Since 
	even root needs at least one x-bit to be able to execute a
	file. And the x-bit hapens to be the search permission-bit
	for directories.

From fs/protect.c:

#
#  /* If none of the X bits are on, not even the super-user can execute it. */
#  xmask = (X_BIT << 6) | (X_BIT << 3) | X_BIT;  /* all 3 X bits */
#  if ( (access_desired & X_BIT) && (bits & xmask) == 0) r = EACCES;
#

	It's obivouse some check on the d-bit is needed as wel.
--

				 (:>	jms
				(_)
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