[uml-devel] compile problem with uml-patch-2.4.22-4

[uml-devel] compile problem with uml-patch-2.4.22-4

[Ross Combs]

The latest 2.4 UML patch added support for an "Anonymous memory device".
I have no idea what this is normally used for so I deselected it in the
configuration.  However that leads to a compile error in mem.c which I
hacked around by adding #if defined(CONFIG_DEV_ANON) .. #endif around
the last line of the array initializer:
   {10, "anon", S_IRUGO | S_IWUSR,             &anon_fops}

I'm not using devfs, so I'm not sure why that function is needed at all.

Anyway, it seems like a small oversight and I haven't noticed any ill
effect from the change.

While I'm on the subject of mysterious configuration items...

It seems strange that most of the UML-specific options don't have any
configuration help.  If nothing else, it is often confusing if the option
is for the host or the userspace kernel.  Yes, I am volunteering if
nobody else wants to do it.  I also find it strange that hostfs and hppfs
are under the "General Setup" section.

Thanks,
-Ross


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Re: [uml-devel] compile problem with uml-patch-2.4.22-4

[Malcolm Tredinnick]

On Mon, 2003-09-15 at 15:45, Ross Combs wrote:
> The latest 2.4 UML patch added support for an "Anonymous memory device".
> I have no idea what this is normally used for so I deselected it in the
> configuration.  However that leads to a compile error in mem.c which I
> hacked around by adding #if defined(CONFIG_DEV_ANON) .. #endif around
> the last line of the array initializer:
>    {10, "anon", S_IRUGO | S_IWUSR,             &anon_fops}
> 
> I'm not using devfs, so I'm not sure why that function is needed at all.
> 
> Anyway, it seems like a small oversight and I haven't noticed any ill
> effect from the change.

Jeff mentioned this in an earlier mail to this list. It is left over
cruft from an experiment. Just leave it turned on for now. :-)

Cheers,
Malcolm



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[uml-devel] Re: compile problem with uml-patch-2.4.22-4

[Patrick "Petschge" Kilian]

Hi,


> It seems strange that most of the UML-specific options don't have any
> configuration help.
Have a look at the 2.5.* and 2.6.0-test* kernels. Some option have 
descriptions there. Perhaps you can use this as a starting point.


> Yes, I am volunteering if nobody else wants to do it.
In this case I volunteer to do some spellchecking and proof reading ;-)

mfg,
Patrick "Petschge" Kilian

-- 
Erst wenn das letzte Closed-Source-System gehackt ist, werdet ihr
merken, dass man Sicherheit nicht durch Verschleierung oder durch
Gesetze erreicht.



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Re: [uml-devel] Re: compile problem with uml-patch-2.4.22-4

[Jeff Dike]

petschge@web.de said:
> > Yes, I am volunteering if nobody else wants to do it. In this case I
> volunteer to do some spellchecking and proof reading ;-) 

Cool, patches like that are useful and easy to merge...

				Jeff



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Re: [uml-devel] Re: compile problem with uml-patch-2.4.22-4

[Patrick "Petschge" Kilian]

Hi,

>>> Yes, I am volunteering if nobody else wants to do it.
>> In this case I volunteer to do some spellchecking and proof reading ;-)
> Cool, patches like that are useful and easy to merge...

I didn't want to way for something to proof read, so I started on my own. 
Most descriptions are the same as in 2.6.0-test5. Please pay special 
attention to the follwoing help textes, as I have written them on my own.

CONFIG_HOST_2G_2G
CONFIG_HIGHMEM
CONFIG_PROC_MM
CONFIG_DEV_ANON
CONFIG_UML_WATCHDOG

Configure.help.patch:
-----


--- linux-2.4.22-uml/Documentation/Configure.help       Wed Sep 17 12:03:54 
2003
+++ linux-2.4.22-uml2/Documentation/Configure.help      Thu Sep 18 18:31:42 
2003
@@ -27646,6 +27646,96 @@
 CONFIG_CRYPTO_TEST
   Quick & dirty crypto test module.

+Separate Kernel Address Space support
+CONFIG_MODE_SKAS
+  This option controls whether skas (separate kernel address space)
+  support is compiled in.  If you have applied the skas patch to the
+  host, then you certainly want to say Y here (and consider saying N
+  to CONFIG_MODE_TT).  Otherwise, it is safe to say Y.  Disabling this
+  option will shrink the UML binary slightly.
+
+Tracing thread support
+CONFIG_MODE_TT
+  This option controls whether tracing thread support is compiled
+  into UML.  Normally, this should be set to Y.  If you intend to
+  use only skas mode (and the host has the skas patch applied to it),
+  then it is OK to say N here.
+
+Force a static link
+CONFIG_STATIC_LINK
+  If CONFIG_MODE_TT is disabled, then this option gives you the ability
+  to force a static link of UML.  Normally, if only skas mode is built
+  in to UML, it will be linked as a shared binary.  This is inconvenient
+  for use in a chroot jail.  So, if you intend to run UML inside a
+  chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
+  here.
+
+HoneyPot ProcFS
+CONFIG_HPPFS
+  hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
+  entries to be overridden, removed, or fabricated from the host.
+  Its purpose is to allow a UML to appear to be a physical machine
+  by removing or changing anything in /proc which gives away the
+  identity of a UML.
+
+  See <http://user-mode-linux.sf.net/hppfs.html> for more information.
+
+  You only need this if you are setting up a UML honeypot.  Otherwise,
+  it is safe to say 'N' here.
+
+2G/2G host address space split
+CONFIG_HOST_2G_2G
+  Most Linux machines are configured so that the kernel occupies the
+  upper 1G of the 4G address space and processes use the lower 3G.
+  However, some machine are configured with a 2G/2G split, with the
+  kernel occupying the upper 2G and processes using the lower 2G.
+
+  To allow UML to run on a host you have to say Y here. N should be
+  a save choice most of the time.
+
+Support for high memory
+CONFIG_HIGHMEM
+  Currently broken, so N is the save answer.
+
+Support for /proc/mm
+CONFIG_PROC_MM
+  If you don't know what this does just say Y.
+
+Kernel stack size order
+CONFIG_KERNEL_STACK_ORDER
+  This option determines the size of UML kernel stacks.  They will
+  be 1 << order pages.  The default is OK unless you're running Valgrind
+  on UML, in which case, set this to 3.
+
+Anonymous Memory support
+CONFIG_DEV_ANON
+  Don't ask. Just say Y.
+
+Support for software watchdog inside UML
+CONFIG_UML_WATCHDOG
+  It's save to say N here.
+
+COW block device
+CONFIG_COW
+  This is a layered driver which sits above two other block devices.
+  One is read-only, and the other is a read-write layer which stores
+  all changes.  This provides the illusion that the read-only layer
+  can be mounted read-write and changed.
+
+pcap transport
+CONFIG_UML_NET_PCAP
+ The pcap transport makes a pcap packet stream on the host look
+  like an ethernet device inside UML.  This is useful for making
+  UML act as a network monitor for the host.  You must have libcap
+  installed in order to build the pcap transport into UML.
+
+  For more information, see
+  <http://user-mode-linux.sourceforge.net/networking.html>  That site
+  has examples of the UML command line to use to enable this option.
+
+  If you intend to use UML as a network monitor for the host, say
+  Y here.  Otherwise, say N.
+
 #
 # A couple of things I keep forgetting:
 #   capitalize: AppleTalk, Ethernet, DOS, DMA, FAT, FTP, Internet,

-----

mfg,
Patrick "Petschge" Kilian

-- 
Erst wenn das letzte Closed-Source-System gehackt ist, werdet ihrmerken, 
dass man Sicherheit nicht durch Verschleierung oder durch
Gesetze erreicht.



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