The problem was that our code in psc.o grabs a free syscall for its own
use. Some software uses the same system call # and expects a return of an
error if that syscall is unavailable (as it is with your kernel) but when
psc.o is loaded it results in a call to some psc syscalls and gives you odd
results.
We've fixed this in newer versions of RTLinux. psc allocates system call
#'s from the top so we shouldn't overlap.
The short-term solution, if you don't want to upgrade, is to not load
psc. As long as you don't use the user-level RTLinux functionality that
psc gives you then you should have no trouble.
} Here are a few messages on the subject and it looks like it solved the problem. I
believe that this problem arose because RedHat included an experimental version of the
compiler in 7.0 & 7.1.
}
}
} Rich
}
}
}
}
} > ----------
} > From: Nathan Paul Simons[SMTP:[EMAIL PROTECTED]]
} > Reply To: [EMAIL PROTECTED]
} > Sent: Wednesday, February 21, 2001 11:04 PM
} > To: Frederic Cazenave
} > Cc: Der Herr Hofrat; Ludwig Ofele; [EMAIL PROTECTED]
} > Subject: Re: [rtl] root id
} >
} > On Wed, Feb 21, 2001 at 05:56:40PM -0500, Frederic Cazenave wrote:
} > <snip>
} > > gcc -v
} > > Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
} > > gcc version 2.96 20000731 (Red Hat Linux 7.0)
} > <snip>
} >
} > Erk . . . um, there have been known problems compiling the kernel
} > with RedHat's "stable" distribution because they decided to put a cutting
} > edge compiler in it. I don't know if that version of the compiler (2.96)
} > miscompiles RTLinux, but I wouldn't rule that out. Have you tried getting
} > the updates for RedHat or using a different version of the compiler (2.7.2.x
} > comes to mind right away)?
} > -- [rtl] ---
} > To unsubscribe:
} > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
} > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
} > --
} > For more information on Real-Time Linux see:
} > http://www.rtlinux.org/rtlinux/
} >
} >
} >
} >
} > ----------
} > From: Frederic Cazenave[SMTP:[EMAIL PROTECTED]]
} > Sent: Wednesday, February 21, 2001 2:53 PM
} > Cc: Ludwig > Ofele; [EMAIL PROTECTED]
} > Subject: Re: [rtl] root id
} >
} > Thanks every buddies, I have upgraded my glibc (glibc-2.2.2-1.i686.rpm) and my
} > problem
} > seem to be solved.
} >
} > Fred
} >
} > Frederic Cazenave wrote:
} >
} > > The both files /etc/passwd and /etc/group the id of root is 0 !!!
} > >
} > > Fred
} > >
} > > Ludwig Ofele wrote:
} > >
} > > > Hello Frederic!
} > > >
} > > > I think, I had a similar problem after an update of Linux Kernel
} > > > (without RT). Your effective user id is 4294967295 which corresponds to
} > > > -1 if you look at it in 64-Bit-Terms. There seems to be a change of
} > > > semantics (-1 changed to 4294967295) in the system and now the rights of
} > > > user and the rights of files do not match any more. I can't explain it
} > > > any better, but maybe this gives you an advice.
} > > > I think, I fixed it by changing the id -1 in the groups or passwd file
} > > > to something more sensful ( (unsigned int32)(-1) = 65535 ?).
} > > >
} > > > Have luck!
} > > >
} > > > Ludwig Ofele, Humantec Industriesysteme
} > > >
} > > > Frederic Cazenave wrote:
} > > > >
} > > > > 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
} > > > >
} > > > > --
} > > > > _________________________________________________________
} > > > > | |
} > > > > | Frederic CAZENAVE |
} > > > > | _/\_ /^= McGill Radar |
} > > > > | \_/ \// Box 198, MacDonald College |
} > > > > | | /-\ | Ste Anne de Bellevue |
} > > > > | || || Quebec, Canada H9X 3V9 |
} > > > > | Tel (514) 398 7733 fax (514) 398 7755 |
} > > > > | mailto:[EMAIL PROTECTED] |
} > > > > | http://www.mpl.orstom.fr/hydrologie/catch/ |
} > > > > |__________________________________________________________|
} > > > >
} > > > > -- [rtl] ---
} > > > > To unsubscribe:
} > > > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
} > > > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
} > > > > --
} > > > > For more information on Real-Time Linux see:
} > > > > http://www.rtlinux.org/rtlinux/
} > >
} > > -- [rtl] ---
} > > To unsubscribe:
} > > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
} > > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
} > > --
} > > For more information on Real-Time Linux see:
} > > http://www.rtlinux.org/rtlinux/
} >
} > --
} > _________________________________________________________
} > | |
} > | Frederic CAZENAVE |
} > | _/\_ /^= McGill Radar |
} > | \_/ \// Box 198, MacDonald College |
} > | | /-\ | Ste Anne de Bellevue |
} > | || || Quebec, Canada H9X 3V9 |
} > | Tel (514) 398 7733 fax (514) 398 7755 |
} > | mailto:[EMAIL PROTECTED] |
} > | http://www.mpl.orstom.fr/hydrologie/catch/ |
} > |__________________________________________________________|
} >
} >
} >
} > -- [rtl] ---
} > To unsubscribe:
} > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
} > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
} > --
} > For more information on Real-Time Linux see:
} > http://www.rtlinux.org/rtlinux/
} >
} >
} >
} > ----------
} > From: Gaspar Bakos[SMTP:[EMAIL PROTECTED]]
} > Reply To: [EMAIL PROTECTED]
} > Sent: Wednesday, May 09, 2001 9:59 AM
} > To: [EMAIL PROTECTED]
} > Subject: [rtl] psc.o, EUID problems
} >
} > Hi,
} >
} > I am a newcomer and installed rtlinux v3.0 on a AMD-K7 600MHz PC
} > running redhat 7.0 with kernel 2.2.18.
} > Installation was straightforward by following steps in the INSTALL file.
} >
} > I found that when loading the psc.o module, the id() system utility gets
} > screwed up, returning a bad euid:
} >
} > [[EMAIL PROTECTED] rtlinux-3.0]# lsmod
} > Module Size Used by
} > psc 18264 0 (unused)
} > rtl_fifo 8536 0 [psc]
} > rtl_posixio 6988 0 [rtl_fifo]
} > rtl_sched 26692 0 [psc]
} > rtl_time 4964 0 [psc rtl_posixio rtl_sched]
} > rtl 17392 0 [psc rtl_fifo rtl_posixio rtl_sched
} > rtl_time]
} > mbuff 5156 0 (unused)
} > tulip 34220 1 (autoclean)
} > pci-scan 2808 0 (autoclean) [tulip]
} >
} > [[EMAIL PROTECTED] rtlinux-3.0]# id
} > uid=0(root) gid=0(root) euid=4294967295 <= !!!
} > groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
} >
} > After this you can't even reboot/halt the system. First I needed to unload
} > psc.o:
} >
} > [[EMAIL PROTECTED] rtlinux-3.0]# rmmod psc
} > [[EMAIL PROTECTED] rtlinux-3.0]# id
} > uid=0(root) gid=0(root)
} > groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
} >
} > I checked the FAQ, etc., but found no trace of such a problem. Can anyone
} > suggest something?>
} >
} > Regards,
} > Gaspar
} >
} > p.s.:
} > Sorry if You receive this two times. Probably I've sent it to a wrong
} > address before.
} > -- [rtl] ---
} > To unsubscribe:
} > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
} > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
} > --
} > For more information on Real-Time Linux see:
} > http://www.rtlinux.org/rtlinux/
} >
}
} -- [rtl] ---
} To unsubscribe:
} echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
} echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
} --
} For more information on Real-Time Linux see:
} http://www.rtlinux.org/rtlinux/
-- [rtl] ---
To unsubscribe:
echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR
echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED]
--
For more information on Real-Time Linux see:
http://www.rtlinux.org/rtlinux/
