Date: Thu, 1 Apr 2004 10:32:58 -0600 From: "Jacques A. Vidrine" <nectar@FreeBSD.org> To: Andrey Chernov <ache@nagual.pp.ru>, current@freebsd.org Subject: Re: Last NSS commit is very dangerous Message-ID: <20040401163258.GA63164@madman.celabo.org> In-Reply-To: <20040401160429.GA3346@nagual.pp.ru> References: <20040331133132.GA2106@nagual.pp.ru> <20040331183921.GA14949@madman.celabo.org> <20040401160429.GA3346@nagual.pp.ru>
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On Thu, Apr 01, 2004 at 08:04:31PM +0400, Andrey Chernov wrote: > On Wed, Mar 31, 2004 at 12:39:21PM -0600, Jacques A. Vidrine wrote: > > I'd really like DETAILS from anyone else encountering any difficulties > > after yesterday's NSS commit. I have so far been unable to reproduce > > the issue, nor has the patch submitter been able to reproduce it. > > I found exact reason (which also explain why nobody still not been > hitted). Somehow while editing my /etc/nsswitch.conf access mode becomes > 0600 while owned by root, i.e. no access from user programs. It > immediately case bugs I describe. Thank you very much for investigating further! > But previous NSS variant can handle this unreadable > /etc/nsswitch.conf nicely, probably using defaults. I believe you are mistaken. Are you 100% certain that revision 1.10 of nsdispatch.c falls back to defaults if /etc/nsswitch.conf exists but is unreadable? I believe that in this case, the result has always been to return NS_UNAVAIL for all nsdispatch() requests. > I think new variant should be fixed to do the same. I believe that the ``new variant'' behaves exactly as it has since before 5.2-RELEASE in this case. > Unreadable /etc/nsswitch.conf is not enough reason to stop working. ``unreadable /etc/nsswitch.conf'' is a different situation than ``no /etc/nsswitch.conf''. The latter means ``gimme the defaults''. The former means ``disable NSS''. I'm willing to listen to arguments that these two situations should be treated exactly the same. Cheers, -- Jacques Vidrine / nectar@celabo.org / jvidrine@verio.net / nectar@freebsd.org
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