Date: 11 May 1997 17:21:39 +0200 From: Wolfram Schneider <wosch@apfel.de> To: Gnuchev Fedor <qwe@ht.eimb.rssi.ru> Cc: freebsd-security@FreeBSD.ORG Subject: Re: Linux UID/GID 'Feature' Message-ID: <p1iwwp65918.fsf@campa.panke.de> In-Reply-To: Gnuchev Fedor's message of Sun, 11 May 1997 13:50:57 %2B0400 (MSD) References: <Pine.BSF.3.95q.970511134602.168C-100000@ht.eimb.rssi.ru>
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Gnuchev Fedor <qwe@ht.eimb.rssi.ru> writes: > > While trying to make a user entry in the /etc/passwd file unrecognized > > so I could demonstrate the use of valid UIDs, I placed a # in front of the UID. > > My theory was that this would make it an invalid number and cause Linux > > to give an authentication failure. (This worked as expect on SunOS 4.1.4) > > But then we tried to su to that user and were rewarded by being dumped > > to UID 0. It didn't recognize the UID so it defaulted to 0. Cool huh? Never put an non-numeric character in UID field! BTW, in FreeBSD-current lines with a leading `#' are comments, and are ignored. See group(5), passwd(5). -- Wolfram Schneider <wosch@apfel.de> http://www.apfel.de/~wosch/
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