Possible bug in 5.1 - su / utmp

Raymond Sundland raymond at sundland.com
Tue Jun 24 08:11:21 PDT 2003


Nevermind this last email.... from a different box :)

Raymond Sundland wrote:
> In addition to my previous email, I found the following:
> 
> % ps auwx |grep login
> root      587  0.0  0.1  1604 1220  p0  Is    5:39AM   0:00.01 login 
> [pam] (login)
> root    57250  0.0  0.1  1604 1232  p1  Is    7:44AM   0:00.02 login 
> [pam] (login)
> root     6162  0.0  0.1  1604 1236  p2  Ss   11:08AM   0:00.01 login 
> [pam] (login)
> 
> 
> Looks like the login process executed via PAM is not exiting (I had only 
> 1 user logged in at this time...), so I guess this is most likely a bug 
> in login?
> 
> Thanks.
> 
> Raymond Sundland wrote:
> 
>> I found this very interesting when I saw it originally, but then found 
>> it was probably a bug.
>>
>> Basically, when I log into my 5.1-RELEASE box (compiled today from 
>> CVS), I can do a 'w' and get the following:
>>
>> % w
>> 10:39AM  up  5:01, 1 user, load averages: 0.00, 0.00, 0.00
>> USER             TTY      FROM              LOGIN@  IDLE WHAT
>> ray              p0       somehost         10:39AM     - w
>>
>> Now, when I try to SU to root, this entry changes:
>>
>> % su -
>> Password:
>> Last login: Tue Jun 24 07:44:19 on ttyp1
>> % whoami
>> root
>> % w
>> 10:40AM  up  5:01, 1 user, load averages: 0.04, 0.01, 0.00
>> USER             TTY      FROM              LOGIN@  IDLE WHAT
>> root             p0       -                10:40AM     - w
>>
>> So, it looks like the utmp entry is being made (again) for ttyp0 and 
>> recording it.  This would be fine from my perspective, but is 
>> misleading once I exit the root shell:
>>
>> % exit
>> % whoami
>> ray
>> % w
>> 10:42AM  up  5:03, 1 user, load averages: 0.01, 0.00, 0.00
>> USER             TTY      FROM              LOGIN@  IDLE WHAT
>> root             p0       -                10:40AM     - w
>>
>>
>> This may be a bug in PAM, since I don't think su calls login (or maybe 
>> it does?)  Note that this does not happen if I do not use the '-' 
>> option for su.  This also shows up in the lastlog:
>>
>> root             ttyp2                     Tue Jun 24 10:40 - 10:43  
>> (00:02)
>> ray              ttyp2    somehost         Tue Jun 24 10:39 - 10:40  
>> (00:00)
>>
>> Anyone have any information about this... know what the bug is?  Maybe 
>> it's a setting I have set that can be changed?
>>
>> Thanks.
>>
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> 
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