Two of my systems have Red-Hat release 3.0.3. I just encountered a problem
which I don't understand and it's making it impossible for users to
change their passwords. `passwd` uses getlogin() to confirm the user's
name.
Given:
main()
{
puts(getlogin());
}
This returns the __first__ name in /var/run/utmp, rather than the
correct one. In other words, it does not read the file, matching
the UID to the last UID of the same value in the file.
If I truncate the file to zero length `>/var/run/utmp`, then login,
the above program prints the correct login name. If I log out and
log in again under another account, the above program prints the
name of the previous person logged in, i.e., the first record in
the file.
First I changed all the login utilities to make sure that they were
all manipulating /var/run/utmp using the same structure definition.
Then I changed all the sysVinit stuff. Still the same problem.
Also I verified that /var/run/utmp increases in size by 768 bytes,
the structure size, every time a login occurs.
So; "What does this have to do with the Linux kernel?", you ask.
The system works correctly when booted from Linux version 2.1.16,
the previous kernel installed. The problem started when I installed
Linux 2.2.6. The 'C' runtime libraries were never changed.
To further explain the quandry, the __exact__ same root file-system,
with only the network configuration changed (host name, IP address)
runs fine on this system with the same kernel and even this kernel,
which is now a "scary hacked/patched" 2.3.13
Does anybody have a clue where else I should look --and how a change
in the kernel could possibly affect this stuff?
I need allow some users to change passwords!!
Cheers,
Dick Johnson
**** FILE SYSTEM WAS MODIFIED ****
Penguin : Linux version 2.3.13 on an i686 machine (400.59 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.
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