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. _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
