Date: Sun, 25 Jan 2015 18:36:40 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Bruce Evans <brde@optusnet.com.au> Cc: svn-src-head@freebsd.org, Baptiste Daroussin <bapt@freebsd.org>, src-committers@freebsd.org, svn-src-all@freebsd.org Subject: Re: svn commit: r277652 - in head/usr.sbin/pw: . tests Message-ID: <20150125153639.GC76051@zxy.spb.ru> In-Reply-To: <20150126014336.P2572@besplex.bde.org> References: <201501241913.t0OJD4xT039188@svn.freebsd.org> <20150125155254.V1007@besplex.bde.org> <20150125142148.GA76051@zxy.spb.ru> <20150126014336.P2572@besplex.bde.org>
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On Mon, Jan 26, 2015 at 02:31:05AM +1100, Bruce Evans wrote: > On Sun, 25 Jan 2015, Slawa Olhovchenkov wrote: > > > On Sun, Jan 25, 2015 at 04:56:24PM +1100, Bruce Evans wrote: > > > >> Negative ids have historical abuses in places like mountd. mountd still > >> hard-codes -2 and -2 for the default uid and gid of an unprivileged user. > >> It at least casts these values to uid_t and gid_t before using them. > >> This gives the ids the non-random values of UINT32_MAX-1 if uid_t and > >> gid_t are uint32_t. (If uid_t and gid_t were signed, then it would > >> leave the values as negative, so invalid.) These magic values may work > >> better than when ids were 16 bits, since there is less risk of them > >> conflicting with a normal id. However, the non-conflict is probably > >> a bug. FreeBSD uses the magic ids of 65534 for user nobody: group > >> nobody. These would have been (id_t)-2 with 16-bit ids. They no > >> longer match, so ls displays (id_t)-2 numerically. FreeBSD also has > >> a group nogroup = 65553 that doesn't match the nfs usage. However2, > >> in FreeBSD-1 wher ids were 16-bits, nobody was 32767 and nogroup was > >> 32766. so they didn't match nfs for other reasons. The 2 non-groups > >> now seem to be just a bug -- FreeBSD-1 didn't have group nobody. > >> 4.4BSD-Lite2 has the same values as FreeBSD-1. > > > > This is not full true for ZFS case. > > On ZFS nobody is 2^32-2. > > File systems don't get to decide this. zfs actually uses 2^16-2. It ls -l /usr/ports/packages32/lang total 2 lrwxr-xr-x 1 4294967294 wheel 33 Mar 17 2012 perl-threaded-5.12.4_4.tbz -> ../All/perl-threaded-5.12.4_4.tbz lrwxr-xr-x 1 4294967294 wheel 27 Mar 17 2012 python27-2.7.2_4.tbz -> ../All/python27-2.7.2_4.tbz lrwxr-xr-x 1 4294967294 wheel 21 Mar 17 2012 tcl-8.5.11.tbz -> ../All/tcl-8.5.11.tbz lrwxr-xr-x 1 4294967294 wheel 29 Mar 17 2012 tcl-modules-8.5.11.tbz -> ../All/tcl-modules-8.5.11.tbz Same in solaris, as i know.
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