This problem has been discussed in the past on this list. Here are a couple
of messages that should help you.
-----Original Message-----
From: Frederic Cazenave [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, February 20, 2001 4:44 PM
To: [EMAIL PROTECTED]
Subject: [rtl] root id
Last week I have posted a question concerning the lost of my root
privilege
after installing rtlinux modules. I can summary all my mail with hofrat
( Der Herr Hofrat <[EMAIL PROTECTED]> ), thanks to him, as following :
I have installed this files :
521612 -rw-r--r-- 1 root root 19090206 Feb 14 20:56
linux-2.2.18.tar.gz
521622 -rw-r--r-- 1 root root 450860 Feb 16 15:10
rtlinux-3.0.tar.gz
then patch linux with kernel_patch-2.2 and build the new rtlinux image
when I reboot my machine and logged as root my id is
[root@xport /root]# id
uid=0(root) gid=0(root)
groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
After installing all the modules of rtlinux my effective id changes :
uid=0(root) gid=0(root) euid=4294967295
groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
(here there is no possibility to bring down the system propely !!)
If I remove all the rt modules my id goes back to the original
uid=0(root) gid=0(root)
groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
Rigth now I didn't find any solution
Fred Cazenave
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} I think the bigger question here is: Why did this happen in the first
place?
}
} Cort,
}
} Is there anyone at FSM Labs know why this occurred?
The problem was with the psc module. Well, actually it wasn't the psc
module it was bad user-land programs.
The PSC module grabs a free syscall when it's loaded. With older kernels
we were getting a free syscall that happens to correspond with a syscall
added to later kernels to set/check privilege levels. Some user-programs
would make a direct call to syscall #201 (not through glibc) and assume it
was the correct one. On kernels that didn't support this syscall the
user-program would get an error. When psc grabbed that syscall the
user-program would end up calling a syscall it didn't intend rather than
the privilege syscall.
We've changed the syscall hook code in psc so that it searches top-down
rather than bottom up. That fixes the problem.
In short, if you have doubts just don't load psc. It's not needed unless
you're using the user-level realtime features of RTLinux.
-----Original Message-----
From: dmv [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, September 25, 2001 9:56 AM
To: [EMAIL PROTECTED]
Subject: Re: [rtl] How do I shutdown the system
Try load/unload RT-Linux
>>/usr/src/RTLDIR/scripts/.insrtl
>>/usr/src/RTLDIR/scripts/.rmrtl
Or even, init 6
Alex
RK Patil wrote:
> Hello,
> I have been able to successfully load RTLinux( rtlinux-3.0, kernel-2.2.18)
> on my PC ( x86). The system is able to boot with both the modules ( Red
Hat
> Linux 7.1 and RTLinux 3.0).
>
> However when I boot the system with RTLinux I have not been able to bring
> down the system using "shutdown" command. the system displays the
following
> error message:
>
> init: you must be the super user
>
> This messege comes inspite of me logging as super user. Can anybody help
me
> out??
>
> --TIA
> RK
>
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>
>
>
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