gmane.linux.colinux.general

Re: kernel module programming

deneme.true — 2012-04-19T20:57:50

I've seen the .config file. I didn't type ./configure again. I've just
type only make command.
I've seen that modpost.o object file is created when compiling. After
that it is possible to compile kernel modules. But at wiki only
'./configure && make kernel' command isn't adequate to compile kernel
modules. If configure file exists; make command should be call.

Regards

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Debugging kernel modules

deneme.true — 2012-04-19T20:47:07

Hello,

It is possible to debug kernel modules with indicating 'debug'
paramater to uml at specified this address:

http://user-mode-linux.sourceforge.net/old/debugging.html

Is it possible to debug kernel modules with coLinux? Is it possible to
provide configured debug vmlinux kernels for slow machines?

Thanks in advance.

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Re: kernel module programming

yin sun — 2012-04-19T03:57:43

are you able to build the colinux kernel and its modules? (./configure; make)
I think this is the way to verify your build environment is properly setup.
then you can try to modify one of the modules, for example comouse.c
after these practice, you should be able to figure what is wrong for
your own module.

/sunyin

On Wed, Apr 18, 2012 at 11:11 AM, deneme.true <deneme.true-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

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Re: kernel module programming

deneme.true — 2012-04-18T18:11:14

I've prepared the kernel module programming environment as specified
at this link:
http://colinux.wikia.com/wiki/CoLinux_FAQ#Q38._Howto_get_kernel_headers_for_coLinux_to_build_an_additional_module.3F

Even, it is not possible to compile a simple hello world module:
This is hello world sample:
http://www.faqs.org/docs/kernel/x145.html

And this is Makefile:
-------------------------------------------------------------------------------------------------------------
obj-m += hello.o

all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
--------------------------------------------------------------------------------------------------------------

And this is the error:

make -C /lib/modules/2.6.33.7-co-0.7.9/build M=/root/hello_world modules
make[1]: Entering directory `/home/m/build/linux-2.6.33.7-build'
make -C /home/m/build/linux-2.6.33.7-source
O=/home/m/build/linux-2.6.33.7-build/. modules


WARNING: Symbol version dump
/ho

Re: kernel module programming

yin sun — 2012-04-17T18:58:22

you need to follow the instructions in doc/building.txt to see how the
kernel is patched for colinux.

On Tue, Apr 17, 2012 at 10:42 AM, deneme.true <deneme.true-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

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kernel module programming

deneme.true — 2012-04-17T17:42:45

I am trying to compile a kernel module for coLinux and I get /"bin/sh:
scripts/mod/modpost: not found" error.

As mentioned this thread:

http://old.nabble.com/-Q--Building-additional-kernel-module-td4769274.html

I couldn't find "conf/linux-config" kernel config file.

Also I try this QA 38:
http://colinux.wikia.com/wiki/CoLinux_FAQ#Q38._Howto_get_kernel_headers_for_coLinux_to_build_an_additional_module.3F

At this website:
http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=tr&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fblog.csdn.net%2Fsabalol%2Farticle%2Fdetails%2F2076610

I must execute "make scripts" command to create modpost but before
executing "make scripts" command, kernel config file should be
generated.

Is there any method for coLinux without configuring kernel(or with
default values)? because it takes a lot of time and it is possible to
make errors when configuring kernel.

Thanks in Advance.

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Re: Problem with ptrace protection in Ubuntu

Alexander Kriegisch — 2012-04-02T09:51:24

Just because I just read an article about the upcoming Linux kernel 3.4,
I wanted to mention that Yama now made it into the kernel main line:

http://heise.de/-1498405 (in German)

https://lkml.org/lkml/2012/3/20/510

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=2d514487faf188938a4ee4fb3464eeecfbdcf8eb



Alexander Kriegisch, 03.02.2012 14:37:

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Re: Crashing problem

Lorne Sturtevant — 2012-03-28T19:39:18

I've created a bug report for this crash.  It's bug 3512516.  Let me
know if there's anything else you require to help track this down.  This
is very high priority for me right now, so I'll be able to help with
this as much as I can.

Re: Crashing problem

Lorne Sturtevant — 2012-03-26T21:04:39

I'll start there.  From what I understand though, crash dumps will only
be produced when the crash is a blue screen, not a reboot.  Is that
correct?  Only <5% of my crashes are blue screens.  Rebooting is far far
more likely.

Re: Crashing problem

Henry N. — 2012-03-26T20:48:11

Hello Lorne,

please go into source code and get the file doc/debugging. There is written how to analyse the windows crash dumps. We need the stack backtrace. After you have such, please attach it on a new created bug report on sourceforge.
Please also attach your configuration.

5-10% is not often. More reproducing would be better. Maybe play with the options. Try less memory, try the initrd. So other developer can also reproduce this bug.

Crashing problem

Lorne Sturtevant — 2012-03-26T19:53:29

I've been having a problem with coLinux crashing on me.  The crash
happens as soon as I start coLinux, but it only happens about 5%-10% of
the time.  I'm running coLinux on WinXP SP3.  When it crashes, it most
often just reboots the host PC.  Very rarely it will blue screen instead.

I've done some searching on the mailing list already and found some
posts about PAE causing a problem.  I did some experiments and I can get
coLinux to start without crashing by turning PAE off.  If I boot Windows
with the parameters /nopae /noexecute=alwaysoff, then I can't reproduce
the crash.  I've also experimented with the other parameters to
/noexecute, but alwaysoff is the only one that works since it's the only
one that truely disables PAE.

Unfortunately, I cannot run the system with PAE off.  I need PAE on so
DEP is enabled.  So my questions are: Is it possible to run with PAE on?
 Is there any other things I can try try and fix the crash?  I'm willing
to get into the code to try and track down this bug and fix it.  Wh

Re: 64bit support

Lorne Sturtevant — 2012-03-12T17:57:11

We don't just want someone to do it on their own time.  We'll pay
someone to complete the port.

Re: 64bit support

Jun Li — 2012-03-12T17:16:52

I have asked for 64-bit coLinux for years but did not get any progress. I
guess it is time for the dev team to make it higher priority now.


On Mon, Mar 12, 2012 at 6:53 AM, David Kaufman <david-8ZdJMhgJluNWk0Htik3J/w< at >public.gmane.org> wrote:

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Re: 64bit support

David Kaufman — 2012-03-12T13:53:45

Hi Lorne!

The lack of 64-bit support is becoming more and more of a problem for me 
too.  I just bought a new laptop and was finally forced into the 64-bit 
hinterlands of Windows 7 -- can't hardly even *buy* a new laptop with 
less that 4 gigs these days.

So... no coLinux for me? :-(

-dave


On 3/5/2012 5:08 PM, Lorne Sturtevant wrote:


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64bit support

Lorne Sturtevant — 2012-03-05T22:08:39

We're currently using coLinux for a project.  We're using it in 32 bit
mode right now, but we require 64bit support.  We noticed there was a
posting for someone else wanting this on oDesk back in Novemenber, but
nothing seems to have come from that.

Is there anyone out there that can add the 64 bit support?  We'll be
able to pay anyone that can perform the work.  All the code can be kept
under the same license.  We just need 64 bit to work.

Re: coLinux-users Digest, Vol 69, Issue 2

Alexander Kriegisch — 2012-02-04T09:56:58

Well, actually I succeeded now with simple examples like one-process,
one-I/O-channel stuff, e.g. a long-running "find /" on one console,
transferring it to another. I could not manage to get a "mc" session to
another TTY though. Maybe this is because of the sub-shell in mc. But I
am also failing at a simple "make menuconfig" because make also has a
sub-process (mconf). I can only transfer "leaves" of a process tree,
i.e. the mconf instance itself.

Do you succeed in doing such stuff?


BTW: Why is the reply-to header wrong in this list and I am always
replaying to people privately in the first try?
--
Alexander Kriegisch (kriegaex)
http://freetz.org


Johann Pascher, 03.02.2012 18:40:

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Re: coLinux-users Digest, Vol 69, Issue 2

Johann Pascher — 2012-02-03T17:40:25

Hi Alexander Kriegisch (kriegaex),

I don't have any problem with it on Ubuntu 12.04 (speedlinux)
Did test with this example:
http://monkeypatch.me/blog/move-a-running-process-to-a-new-screen-shell.html
Best regards, Johann Pascher

2012/2/3  <colinux-users-request-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org>:

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Re: Problem with ptrace protection in Ubuntu

Alexander Kriegisch — 2012-02-03T13:37:30

Thanks Yin for testing this and trying to help me.

Probably you mean either reptyr or retty when you mention that you
tested this on your system (I do not know a tool named rettyer).

I do not know about Debian 6.0.3, but I guess it does not have yama in
its original kernel so there is no damage done if colinux does not have
it either. Debian 6.0.3 just does not expect it. so the test is kind of
pointless. Let me explain (again) why: I am running Ubuntu 11.10. Its
original kernel *does* have yama, so the rest of the system expects it
to exist. Probably it checks the return value of
/proc/sys/kernel/yama/ptrace_scope, but that "file" does not exist if
there is no yama. Now reptyr even knows about yama, showing a warning
message if /proc/sys/kernel/yama/ptrace_scope returns 1. As soon as I
set it to 0 on my native Ubuntu, reptyr works nicely. I guess it also
does on colinux if you use an OS which does not expect yama ptrace
protection to be in the kernel, e.g. an older Ubuntu or probably your
Debian 6.0.3.

D

Re: Problem with ptrace protection in Ubuntu

yin sun — 2012-02-03T05:47:25

OK, I tried on my debian 6.0.3 (latest colinux kernel), rettyer works.
And I am sure the colinux doesn't have yama. whether have yama or not
may not be your problem.
Since it only provide protection for non root user.
not sure what else could be wrong, sorry can't help you more.

/Yin



On Thu, Feb 2, 2012 at 6:28 PM, yin sun <sunyin51-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:

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Re: Problem with ptrace protection in Ubuntu

yin sun — 2012-02-03T02:28:04

I guess you are right, there is no yama LSM in 2.6.33.7

/Yin

On Tue, Jan 31, 2012 at 8:48 PM, Alexander Kriegisch
<kriegaex-fgT9O23tLJkdnm+yROfE0A< at >public.gmane.org> wrote:

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Problem with ptrace protection in Ubuntu

Alexander Kriegisch — 2012-02-01T04:48:11

Hi.

I am running andLinux/coLinux:

$ uname -a
Linux andLinux 2.6.33.7-co-0.7.10-r1588 #1 PREEMPT Mon Aug 8 04:13:31 UTC 2011 i686 athlon i386 GNU/Linux

But...

$ cat /etc/motd | head -n 1
Welcome to Ubuntu 11.10 (GNU/Linux 2.6.33.7-co-0.7.10-r1588 i686)

Now the problem is so-called "ptrace protection", explained there:
https://wiki.edubuntu.org/SecurityTeam/Roadmap/KernelHardening#ptrace_Protection

I tried to use tools like reptyr and injcode:
https://github.com/nelhage/reptyr#readme
https://github.com/ThomasHabets/injcode#readme

Both of them do not work as expected. My suspicion is that this is due to my combination of coLinux kernel (without yama) and new Ubuntu (relying on yama). I tried to run the tools as root (sudo -i) because I expected ptrace protection to be inactive according to the description at Ubuntu, but to no avail.

My questions are:
  1) Can you confirm that my suscpcion is correct?
    2a) If not, what else might be the reason for my problems?
    2b) If so, is there anything I can d