Re: UML troubles
Hi,
i had the same problems on the debian 2.4.26-1um2 uml kernel with a host
machine WITHOUT grsec kernel... The 2.4.26-1um1 worked without any problem.
I think there was a bug report on the debian BTS but if I remeber correctly
the Maintainer can't reproduce this.
I think the debian uml package is quite outdated. I compiled and debianized a
2.6.6 uml for my own needs and for the small isp for which I work for.
I plan to compile a 2.6.8 package as soon as the 2.6.8 uml patch becomes
available.
If you are interessted in my user-mode-linux package, then add these line to
your sources.list
deb http://packages.debianbase.de/<sid/sarge>/i386/uml-exp ./
deb-src http://packages.debianbase.de/sources/uml-exp
(choose sid or sage for <sid/sarge>)
You should think about taking a up-to-date 2.6 kernel for your host system
too, and for the performance and the security you should include the
host-skas3 patch to your host kernel.
sorry, I don't have any host-kernel with skas patch as package available for
download, but for me the 2.6.6 patch with a clean 2.6.6 kerne-source (debian)
worked perfect.
--Ralph
Am Montag 16 August 2004 19:34 schrieb Dmitry Golubev:
> Hi!
>
> Maybe someone has tried UML kernel on grsec machine? I took that Debian
> precompiled UML kernel, run it with "linux root=/servers/moon
> " (that /servers/moon is one of my production servers' ext2 partition
> image), but UML says:
>
> ...
> mconsole (version 2) initialized on /root/.uml/N7Jm6p/mconsole
> unable to open root_fs for validation
> Initializing stdio console driver
> NET4: Linux TCP/IP 1.0 for NET4.0
>
> And that's all... no further messages, nothing. The modules required for
> this kernel has been put inside the image. The host kernel is with grsec
> patches,. and it tells in /var/log something about resource overstep:
>
> Aug 16 17:13:51 localhost kernel: grsec: attempted resource overstep by
> requesting 494927872 for RLIMIT_STACK against limit 8388608
> by /usr/bin/linux[linux:29530] uid/euid:0/0 gid/egid:0/0,
> parent /usr/bin/linux[linux:2566] uid/euid:0/0 gid/egid:0/0
>
>
> Any ideas?
> Thanks,
> Dmitry
>
> For your reference, the complete output running UML:
>
> virtual:~# linux root=/servers/moon
> Checking for the skas3 patch in the host...not found
> Checking for /proc/mm...not found
> tracing thread pid = 8253
> Checking for /dev/anon on the host...Not available (open failed with errno
> 2) Checking for /dev/anon on the host...Not available (open failed with
> errno 2) Checking for /dev/anon on the host...Not available (open failed
> with errno 2) Checking for /dev/anon on the host...Not available (open
> failed with errno 2) Linux version 2.4.26-2um (root@mizar) (gcc version
> 3.3.4 (Debian 1:3.3.4-3)) #2 Fri Jul 16 17:51:17 PDT 2004
> On node 0 totalpages: 8192
> zone(0): 8192 pages.
> zone(1): 0 pages.
> zone(2): 0 pages.
> Kernel command line: root=/servers/moon
> Calibrating delay loop... 989.59 BogoMIPS
> Memory: 28148k available
> Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
> Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
> Mount cache hash table entries: 512 (order: 0, 4096 bytes)
> Buffer cache hash table entries: 1024 (order: 0, 4096 bytes)
> Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
> Checking for host processor cmov support...Yes
> Checking for host processor xmm support...No
> Checking that ptrace can change system call numbers...OK
> Checking that host ptys support output SIGIO...Yes
> Checking that host ptys support SIGIO on close...No, enabling workaround
> POSIX conformance testing by UNIFIX
> Linux NET4.0 for Linux 2.4
> Based upon Swansea University Computer Society NET3.039
> Initializing RT netlink socket
> Starting kswapd
> VFS: Disk quotas vdquot_6.5.1
> Journalled Block Device driver loaded
> devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
> devfs: boot_options: 0x0
> SGI XFS with ACLs, no debug enabled
> SGI XFS Quota Management subsystem
> Disabling 2.6 AIO in tt mode
> pty: 256 Unix98 ptys configured
> RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
> loop: loaded (max 8 devices)
> Initializing Cryptographic API
> Initializing software serial port version 1
> mconsole (version 2) initialized on /root/.uml/N7Jm6p/mconsole
> unable to open root_fs for validation
> Initializing stdio console driver
> NET4: Linux TCP/IP 1.0 for NET4.0
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