Date: Tue, 16 Aug 2005 16:43:16 +0300 From: Vasil Dimov <vd@datamax.bg> To: Joost Bekkers <joost@jodocus.org>, Dmitry Agaphonov <rzhe@agava.com>, freebsd-hackers@freebsd.org Subject: Re: Shared memory permissions question Message-ID: <20050816134316.GA29915@sinanica.bg.datamax> In-Reply-To: <20050816131034.GA44545@bps.jodocus.org> References: <20050816165115.2387c14f@rzhe.agava-dubna.local> <20050816131034.GA44545@bps.jodocus.org>
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[-- Attachment #1 --] On Tue, Aug 16, 2005 at 03:10:34PM +0200, Joost Bekkers wrote: > On Tue, Aug 16, 2005 at 04:51:15PM +0400, Dmitry Agaphonov wrote: > > Hello, > > > > > > I have user A from group G creating shared memory M with permissions > > 0060. After this, A fails to attach M due to permission denied. > > However, another user B from the same group G successfully attaches M. > > User A manages to attach only if permissions 0600 added for M. > > > > Why the system disregards group permissions for user A? Is it correct > > behaviour? > > > > This is happening on FreeBSD 4.11-STABLE. > > > > This is normal&correct behaviour. > > Access if granted on a best match basis: > > if user==owner then only user rights are applied > elseif user is member of group then only group rights are applied > else only 'other' rights are applied. > This also applies for the filesystem. $ id uid=1001(dd) gid=1001(dd) groups=1001(dd) $ ls -l file ----r--r-- 1 dd dd 0 Aug 16 16:34 file $ cat file cat: file: Permission denied $ [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iD8DBQFDAe1zFw6SP/bBpCARAvjpAKCytkie+ODFExYBeE1EWM1VxqQCjQCg4OfM ngiqF0I1nfzNghiNlXllguI= =fKKX -----END PGP SIGNATURE-----help
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