From: Ryan McGovern <mcgoverp@...>
Date: 2006-06-27T00:06:18+09:00
Subject: Large uid's with Etc.getpwnam

I beleve there is a bug in Etc.getpwnam.  On our OS X server running 10.4 with ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0] we use AD for user management.
The two id's the one that is my real id i got from ls -ln and the one from getpwnam differ only in the sign bit, so it looks like ruby is treating it as a 1's compliment number when it is an unsigned int.  i could change if you take -566183520 & 0x7FFFFFFF in ruby it will return  the proper number 1581300128.  The same happens for all users with larger id's in our AD system.

irb(main):016:0> Etc.getpwuid(1581300128)
=> #<struct Struct::Passwd name="mcgoverp", passwd="********", 
uid=-566183520, gid=513, gecos="Ryan McGovern", 
dir="/Network/Servers/ucfilespace.uc.edu/Home/m/mcgoverp", 
shell="/usr/local/profile", change=0, uclass="", expire=0>


irb(main):017:0> uinf=Etc.getpwnam("mcgoverp")
=> #<struct Struct::Passwd name="mcgoverp", passwd="********", 
uid=-566183520, gid=513, gecos="Ryan McGovern", 
dir="/Network/Servers/ucfilespace.uc.edu/Home/m/mcgoverp", 
shell="/usr/local/profile", change=0, uclass="", expire=0>



irb(main):019:0> Etc.getpwuid(-566183520)
ArgumentError: can't find user for -566183520
        from (irb):19:in `getpwuid'
        from (irb):19
        from :0

irb(main):005:0> Etc.getpwnam("monkir")
=> #<struct Struct::Passwd name="monkir", passwd="********", uid=-476125468, gid=513, gecos="Ian Monk", dir="/Network/Servers/ucfilespace.uc.edu/Home/m/monkir", shell="/bin/bash", change=0, uclass="", expire=0>
irb(main):006:0> Etc.getpwnam("monkir").uid & 0x7FFFFFFF
=> 1671358180
irb(main):007:0> Etc.getpwuid(1671358180)
=> #<struct Struct::Passwd name="monkir", passwd="********", uid=-476125468, gid=513, gecos="Ian Monk", dir="/Network/Servers/ucfilespace.uc.edu/Home/m/monkir", shell="/bin/bash", change=0, uclass="", expire=0>