May 2012 - Libguestfs - libguestfs List Archives

Fwd: hivex: patch for read support of "li"-records from "ri" intermediate
by Richard W.M. Jones 11 Oct '12

11 Oct '12

[The bug which this fixes is: https://bugzilla.redhat.com/show_bug.cgi?id=717583 ] ----- Forwarded message from Peter Fokker <peter(a)berestijn.nl> ----- Date: Thu, 8 Mar 2012 11:37:06 +0100 (CET) From: Peter Fokker <peter(a)berestijn.nl> To: rjones(a)redhat.com Cc: Peter Fokker <peter(a)berestijn.nl> Subject: hivex: patch for read support of "li"-records from "ri" intermediate User-Agent: SquirrelMail/1.4.9a Richard, Thank you for creating the hivex-library. Studying your source code helped me a great deal to better understand the internals of the Windows Registry. However, while I was browsing a real-world SOFTWARE-hive (XP, SP3) I could not browse to the '\Classes' key. Instead I got this (debug)-message: get_children: returning ENOTSUP because ri-record offset does not point to lf/lh (0x49020) I tracked this issue down and I discovered that the intermediate "ri"-record may not only contain offsets to "lf" and "lh" but to "li"-records too. Attached is a patch against hivex.c v1.3.3 that recognises "li"-records referenced from "ri"-records. For me this fixed the issue with browsing the '\Classes' key. Note that I have not fixed the related problem of rewriting "li"-records when inserting a new subkey or deleting an existing one. This sure would cause problems when I were to add/delete a subkey to/from '\Classes'. I would very much appreciate it if would be so kind to take a look at my patch, allthough I cannot blame you if you immediately dump this unsollicited message+patch from some random stranger from The Netherlands. Kind regards, --Peter Fokker -- Peter Fokker <peter(a)berestijn.nl> Ingenieursbureau PSD +31 35 695 29 99 / +31 644 238 568 Stargardlaan 7 1404 BC Bussum, The Netherlands ----- End forwarded message ----- -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org

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New tool proposal
by Wanlong Gao 02 Jul '12

02 Jul '12

Hi Rich, We just talked about a new tool virt-diff which can diff files between two guest, suggested by Kamezawa Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com> things like below, # virt-diff -Nru --guest=Guest0 --guest=Guest1 /etc/hosts Any thought about this? Another question, what do you think about implement iptables, firewall, yum, rpm, etc into libguestfs? Thanks, Wanlong Gao

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A few out-of-tree build fixes
by Hilko Bengen 06 Jun '12

06 Jun '12

Here are a few patches that were needed to build the 1.18.0-1 packages for Debian. Cheers, -Hilko

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Re: [Libguestfs] Ocaml and pthread_atfork()
by Richard W.M. Jones 03 Jun '12

03 Jun '12

On Thu, May 03, 2012 at 02:00:27PM +1000, Tony Breeds wrote: > Hi All, > Firstly I apologize if this is noise. I elected to not file a > bugzilla as the problem seems to be powerpc specific and with the limited > resources for Fedora developers it would seem unfair. > > I was recently trying to build a "current" libguestfs from the f16 > branch[1]. During the build I hit: > > (extracted from rpmbuild) > > [tony@sneetch ~]$ bash -x tmp/ocaml-test.sh > + cd rpmbuild/BUILD/libguestfs-1.16.9/ocaml/ > + LD_LIBRARY_PATH=../src/.libs > + ocamlfind ocamlc -g -warn-error CDEFLMPSUVYZX -I . -package unix,threads -thread -linkpkg mlguestfs.cma t/guestfs_070_threads.cmo -o t/guestfs_070_threads.bc > File "_none_", line 1, characters 0-1: > Error: Error on dynamically loaded library: /usr/lib64/ocaml/stublibs/dllthreads.so: /usr/lib64/ocaml/stublibs/dllthreads.so: undefined symbol: pthread_atfork > > I did a quick bit of googling and found: > http://ryanarn.blogspot.com.au/2011/07/curious-case-of-pthreadatfork-on.html > > which seems to explain what's going on to my naive eye anyway. > > I've tried a few different CFLAGS/patches to > otherlibs/systhreads/Makefile to try and induce pthreads_atfork() to be > resolved and linked during the ocaml build. Nothing I try works. > > Does anyone have any ideas on how to solve this? > > I'm happy to do the heavy lifting I just don't have the background in > ocaml to solve this by myself. > > Yours Tony > > [1] I suspects that as a result of the demotion to secondary and things > languishing there we skipped a few builds. It looks like the PPC64 OCaml package is buggy. Can you compile any threaded program at all, eg: echo 'print_endline "hello"' > test.ml ocamlfind c -package threads -thread test.ml -linkpkg -o test ./test Unfortunately I don't have access to ppc64, so there's no way I can even look at bugs in this area, let alone fix them. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/

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UK public holiday
by Richard W.M. Jones 31 May '12

31 May '12

Monday 4th June and Tuesday 5th of June are a public holiday in the UK, so it's likely that fewer people than usual will be around on IRC/mailing lists over the long weekend. See you all next Wednesday. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw

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windows xp see 'unknow partition'
by me,apporc 31 May '12

31 May '12

Hi, I use guestfs.part_disk to partition one disk with 'mbr' and formated it to ntfs, then attach this disk to one windows xp virtual machine. But this windows xp can't recognise that partition, it says 'uknown partition' Why it is so, and how to solve it? May someone help me with this problem? Thanks.

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"ext2: parent directory not found" with Ubuntu 12.04
by Sebastien Douche 30 May '12

30 May '12

Hi all, On the most libguestfs commands (guestfish, virt-*), I have always the same message: "febootstrap-supermin-helper: ext2: parent directory not found: /lib: File not found by ext2_lookup" I'm aware of a similar bug with the old package [1]: "Note on febootstrap (may not be directly related to this bug): You need 3.14 to work around that. I would recommend using at least 3.14. https://github.com/libguestfs/febootstrap/commit/6987ad1529dd67e7e1c990fe5b… Furthermore, febootstrap <= 3.14 reveals a bug in e2fsprogs, which needs to be worked around with another patch: https://github.com/libguestfs/febootstrap/commit/386b5985098fedf7bcd111553b…" But I use last packages of Seabios / libguestfs-bin which contain all the patchs. Any hint? Thanks. [1] https://bugs.launchpad.net/ubuntu/+source/libguestfs/+bug/930634 -- Sebastien Douche <sdouche(a)gmail.com> Twitter: @sdouche / G+: +sdouche

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virt-sysprep on Windows Guest
by Wanlong Gao 28 May '12

28 May '12

Hi Rich, folks, I wont to start doing the windows guest support for virt-sysprep, Any thoughts? What do you think should be prepared on a new cloned windows guest? Thanks, Wanlong Gao

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Re: [Libguestfs] NTFS(-3g) large alternate data streams
by Richard W.M. Jones 28 May '12

28 May '12

(I meant to copy this message to the mailing list) On Mon, May 28, 2012 at 05:49:36PM +0100, Richard W.M. Jones wrote: > > This file has an approx 48 MB ADS: > > ><fs> ll /Temp/ > total 13 > drwxrwxrwx 1 root root 0 May 28 17:28 . > drwxrwxrwx 1 root root 4096 Nov 1 2011 .. > -rwxrwxrwx 1 root root 13 Oct 5 2011 ADS_test.txt > ><fs> getxattrs /Temp/ADS_test.txt > libguestfs: error: getxattrs: getxattr: Argument list too long > > The code in libguestfs tries to allocate enough space to store the > return value using malloc. There is a correct check on the return > from malloc, so I don't believe there is any possible DoS here. It > also frees the buffer along the return path. [However through an > abundance of caution I'm going to modify this code to add an upper > limit, see below.] > > In any case what actually fails is the kernel call: > > vlen = getxattr (path, /* name of xattr */, > /* return pointer */, > /* ~ 48 MB */); > > because I was wrong before when I said there was no limit at all. In > fact the limit in the kernel is XATTR_SIZE_MAX == 65536. > > So essentially there is no chance of returning ADSes using the > standard way. You'll have to use the ntfs-3g streams_interface=windows > mount option. > > Rich. > > -- > Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones > virt-p2v converts physical machines to virtual machines. Boot with a > live CD or over the network (PXE) and turn machines into Xen guests. > http://et.redhat.com/~rjones/virt-p2v -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://et.redhat.com/~rjones/virt-top

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FYI: CVE-2012-2652 in qemu could affect libguestfs users
by Richard W.M. Jones 28 May '12

28 May '12

Jim Meyering found various flaws in the creation of temporary files in qemu. For more details see: http://marc.info/?l=qemu-devel&m=133819025731504&w=2 http://bugzilla.redhat.com/CVE-2012-2652 This problem could affect libguestfs users, particularly (but not exclusively) if libguestfs was run as root. No update is needed for libguestfs, but you should check that the version of qemu you are using contains a fix for this bug. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora

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