[uml-devel] SKAS mode patch compatibility w/RH8 2.8.18-19.8.0 (Kernel panic: restore_registers - saving registers failed, errno = 3)

[uml-devel] SKAS mode patch compatibility w/RH8 2.8.18-19.8.0 (Kernel panic: restore_registers - saving registers failed, errno = 3)

[Joe Marzot]

I am running the above combination on the host w/host-skas3a-RH8.patch 
(yes, feel bad for me as I can't change the host version - dictated by 
IT). For the guest I am running 2.4.24 w/uml-patch-2.4.24-1. I run both 
UP and SMP versions of the host.

I am getting

Kernel panic: restore_registers - saving registers failed, errno = 3

I am not sure if the ptrace patch has been applied to my host (how would 
I tell) but I am getting symptoms similar to those described below in a 
previous thread.

could it be that the SKAS patch is not happy with my host baseline?

I would like to try the 2.4.25 skas patch from 
http://www.user-mode-linux.org/~blaisorblade/ but not sure if that would 
help or hurt in my case...

Any words of wisdom appreciated.

regards, Giovanni


----------------------------------
List:       user-mode-linux-devel
Subject:    Re: [uml-devel] 2.4.20-4um Kernel panic: restore_registers - 
saving registers failed, errno = -1
From:       Matt Zimmerman <mdz () debian ! org>
Date:       2003-04-28 16:04:18
[Download message RAW]

On Mon, Apr 28, 2003 at 06:05:46PM +0200, Michael Koehne wrote:

 > Kernel panic: restore_registers - saving registers failed, errno = -1
 >
 >   the hosting system is Debian/Woody running 2.4.21-rc1+SKAS.

This is symptomatic of a host kernel which has the ptrace security patch +
skas (the former breaks the latter).  This is the case for the patch which
is in the 2.4.20-6 Debian sources; I do not know whether 2.4.21-rc1 is
different.




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[uml-devel] No of ubd

[Raymond Wong]

How many ubd drives are available to use?  8? Or 256?  

Ray

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Re: [uml-devel] No of ubd

[Henrik Nordstrom]

On Fri, 28 May 2004, Raymond Wong wrote:

> How many ubd drives are available to use?  8? Or 256?  

8, each with 16 partitions.


Regards
Henrik



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Re: [uml-devel] No of ubd

[Leendert Meyer]

On Friday 28 May 2004 10:13, Henrik Nordstrom wrote:
> On Fri, 28 May 2004, Raymond Wong wrote:
> > How many ubd drives are available to use?  8? Or 256?
>
> 8, each with 16 partitions.

To create an ubd partition, one does on the host e.g.

  dd if=/dev/zero of=rootfs count=1 bs=1G
  mkreiserfs -ff rootfs

But how to make an ubd drive?

Cheers,

Leen


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Re: [uml-devel] No of ubd

[Henrik Nordstrom]

On Fri, 28 May 2004, Leendert Meyer wrote:

> To create an ubd partition, one does on the host e.g.
> 
>   dd if=/dev/zero of=rootfs count=1 bs=1G
>   mkreiserfs -ff rootfs
> 
> But how to make an ubd drive?

Partition it using fdisk/sfdisk/whatever..

Regards
Henrik



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Re: [uml-devel] No of ubd

[Leendert Meyer]

On Friday 28 May 2004 20:33, Henrik Nordstrom wrote:
> On Fri, 28 May 2004, Leendert Meyer wrote:
> > To create an ubd partition, one does on the host e.g.
> >
> >   dd if=/dev/zero of=rootfs count=1 bs=1G
> >   mkreiserfs -ff rootfs
> >
> > But how to make an ubd drive?
>
> Partition it using fdisk/sfdisk/whatever..

Ok, here's what I tried:

---8<---8<---8<---8<---8<---8<---
ws-02:/home/leen # dd if=/dev/zero of=rootfs count=1 bs=100M
1+0 records in
1+0 records out
ws-02:/home/leen # fdisk rootfs
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF 
disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

You must set cylinders.
You can do this from the extra functions menu.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help):
---8<---8<---8<---8<---8<---8<---

I know how to use fdisk. But I need a bit of guidance here. Given *any* 
partitionsize, what are the appropriate values? Is there a formula for that?

And *before* I can partition the disk, are there even more data to fill in?

TIA,

Cheers,

Leen


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Re: [uml-devel] No of ubd

[Henrik Nordstrom]

On Fri, 28 May 2004, Leendert Meyer wrote:

> I know how to use fdisk. But I need a bit of guidance here. Given *any* 
> partitionsize, what are the appropriate values? Is there a formula for that?

You just need to set some geometry on the disk.. Linux does not care 
what..  The only important matter is that the geometry should add upp to 
the size of your disk (in 512 byte sectors).

> And *before* I can partition the disk, are there even more data to fill in?

Nope.

Regards
Henrik



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Re: [uml-devel] No of ubd

[Leendert Meyer]

On Saturday 29 May 2004 10:40, Henrik Nordstrom wrote:
> On Fri, 28 May 2004, Leendert Meyer wrote:
> > I know how to use fdisk. But I need a bit of guidance here. Given *any*
> > partitionsize, what are the appropriate values? Is there a formula for
> > that?
>
> You just need to set some geometry on the disk.. Linux does not care
> what..  The only important matter is that the geometry should add upp to
> the size of your disk (in 512 byte sectors).

Found this in linux/Documentation/kernel-parameters.txt:
---8<---8<---8<---
	hd=		[EIDE] (E)IDE hard drive subsystem geometry
			Format: <cyl>,<head>,<sect>
---8<---8<---8<---

And this in linux/Documentation/ide.txt:
---8<---8<---8<---
 "hdx=cyl,head,sect"	: disk drive is present, with specified geometry
---8<---8<---8<---

Nothing on ubd concerning geometry. Do I need the fake_ide or fakehd 
parameters in combination with a hdx=C,H,S?

Cheers,

Leen


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Re: [uml-devel] No of ubd

[Leendert Meyer]

On Saturday 29 May 2004 14:08, Leendert Meyer wrote:
> On Saturday 29 May 2004 10:40, Henrik Nordstrom wrote:
> > On Fri, 28 May 2004, Leendert Meyer wrote:
> > > I know how to use fdisk. But I need a bit of guidance here. Given *any*
> > > partitionsize, what are the appropriate values? Is there a formula for
> > > that?
> >
> > You just need to set some geometry on the disk.. Linux does not care
> > what..  The only important matter is that the geometry should add upp to
> > the size of your disk (in 512 byte sectors).
>
> Found this in linux/Documentation/kernel-parameters.txt:
> ---8<---8<---8<---
> 	hd=		[EIDE] (E)IDE hard drive subsystem geometry
> 			Format: <cyl>,<head>,<sect>
> ---8<---8<---8<---
>
> And this in linux/Documentation/ide.txt:
> ---8<---8<---8<---
>  "hdx=cyl,head,sect"	: disk drive is present, with specified geometry
> ---8<---8<---8<---
>
> Nothing on ubd concerning geometry. Do I need the fake_ide or fakehd
> parameters in combination with a hdx=C,H,S?

I found out that: 

a) Debians cfdisk calculates the number of cilinders automatically, when used 
on an empty disk image file. My current {c,}fdisk (SuSE Linux 9.0) is not 
that smart. UML calculates the same number of cylinders.

b) On the kernel command line, ubd#=<file>, where file can be a disk image, a 
partition (e.g. /dev/hda7), or an entire disk (e.g. /dev/hdd). You can even 
use COW files on partitions and disks.

c) In UML, ubd0 is mapped to ubda, ubd1 is mapped to ubdb, etc.

Thanks to Uwe Barteld for assistance! :)

Cheers,

Leen


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Re: [uml-devel] No of ubd

[Henrik Nordstrom]

On Sat, 29 May 2004, Leendert Meyer wrote:

> Found this in linux/Documentation/kernel-parameters.txt:
> ---8<---8<---8<---
> 	hd=		[EIDE] (E)IDE hard drive subsystem geometry
> 			Format: <cyl>,<head>,<sect>
> ---8<---8<---8<---
> 
> And this in linux/Documentation/ide.txt:
> ---8<---8<---8<---
>  "hdx=cyl,head,sect"	: disk drive is present, with specified geometry
> ---8<---8<---8<---
> 
> Nothing on ubd concerning geometry. Do I need the fake_ide or fakehd 
> parameters in combination with a hdx=C,H,S?

As I said the Linux kernel does nor care about the geometry.

Geometry is only used by fdisk and friends and there you can specify the
geometry interactively. The only reason why there exists a geometry 
concept in Linux is because of DOS/BIOS compatibility reasons and certain 
I/O subsystems who can not address secotors (old IDE is an example and is 
why you have all the horror of hard drive size limitations in old IDE 
systems..)

Regards
Henrik



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Re: [uml-devel] No of ubd

[Leendert Meyer]

On Sunday 30 May 2004 20:43, Henrik Nordstrom wrote:

> As I said the Linux kernel does nor care about the geometry.

Ok, I'll accept that as a fact, but I got confused because fdisk & co do care:

> Geometry is only used by fdisk and friends and there you can specify the
> geometry interactively. 

And that was exactly where I had to use it! :) My fdisk & co won't work 
without knowing the number of cylinders. Fortunately Debian's cfdisk is able 
to calculate the number of cylinders, and that brought me on the road again.

> The only reason why there exists a geometry 
> concept in Linux is because of DOS/BIOS compatibility reasons and certain
> I/O subsystems who can not address secotors (old IDE is an example and is
> why you have all the horror of hard drive size limitations in old IDE
> systems..)

Do you mean CHS vs. LBA?

Cheers,

Leen


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Re: [uml-devel] No of ubd

[Henrik Nordstrom]

On Sun, 30 May 2004, Leendert Meyer wrote:

> And that was exactly where I had to use it! :) My fdisk & co won't work 
> without knowing the number of cylinders.

In all versions I have seen you can set the geometry from the expert menu 
in fdisk..

If you use sfdisk then there is command line options to specify the 
geometry.

> Do you mean CHS vs. LBA?

Yes.

Regards
Henrik



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