Is there a /lib/tls directory?
If so, type 'mv /lib/tls /lib/tls.bak', and you should be good with the
2.6 kernel.
(2.4 doesnt have this issue)
-Tim
Csillag Kristof wrote:
Hi there!
The summary:
When running on the UML kernel I have just built from vanilla
linux-2.6.11.11 (downloaded from kernel.org, without any patches),
the SSHD version packaged in Debian Sarge segfaults.
The same happens if I build the UML kernel from debian's
kernel-source-2.6.11 package.
But when I run the same system with the 2.4.26-um3 UML kernel that is
packaged with Debian, this does not happen.
So this seems to be a bug in the 2.6.11 kernel.
* * *
Here is how to reproduce it:
Rootstrap a new UML box with Matt Zimmerman's rootstrap utility.
The relevant section in the config file I used is this:
-----------------------------------------------------------------
[debian]
dist=sarge
mirror=http://eros/debian
exclude=pcmcia-cs setserial
#<purge=base-config console-common console-tools console-data
console-tools-libs
#include=stuff
install=ssh
root_password=xxxx
----------------------------------------------------------------------
(As you can see, I added ssh to the list of automatically installed
packages.)
The box is built just fine, but when I try to SSH into it, I get kicked.
(Doesn't even ask for a password.)
When I got in the UML host by other means, and I ran the sshd with
verbose output to see what's going on, I see this:
-----------------------------------------------------------------------
center:/etc/init.d# sshd -dD
debug1: sshd version OpenSSH_3.8.1p1 Debian-8.sarge.4
debug1: read PEM private key done: type RSA
debug1: private host key: #0 type 1 RSA
debug1: read PEM private key done: type DSA
debug1: private host key: #1 type 2 DSA
socket: Address family not supported by protocol
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug1: Server will not fork when running in debugging mode.
Connection from 192.168.20.1 port 39966
debug1: Client protocol version 2.0; client software version
OpenSSH_3.8.1p1 Debian-8.sarge.4
debug1: match: OpenSSH_3.8.1p1 Debian-8.sarge.4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1 Debian-8.sarge.4
debug1: permanently_set_uid: 100/65534
debug1: list_hostkey_types: ssh-rsa,ssh-dss
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user csillag service ssh-connection method
none
debug1: attempt 0 failures 0
Failed none for csillag from 192.168.20.1 port 39966 ssh2
debug1: PAM: initializing for "csillag"
debug1: userauth-request for user csillag service ssh-connection method
publickey
debug1: attempt 1 failures 1
debug1: test whether pkalg/pkblob are acceptable
debug1: PAM: setting PAM_RHOST to "192.168.20.1"
debug1: PAM: setting PAM_TTY to "ssh"
debug1: temporarily_use_uid: 1000/1000 (e=0/0)
debug1: trying public key file /home/csillag/.ssh/authorized_keys
debug1: restore_uid: 0/0
debug1: temporarily_use_uid: 1000/1000 (e=0/0)
debug1: trying public key file /home/csillag/.ssh/authorized_keys2
debug1: restore_uid: 0/0
Failed publickey for csillag from 192.168.20.1 port 39966 ssh2
debug1: userauth-request for user csillag service ssh-connection method
keyboard-interactive
debug1: attempt 2 failures 2
debug1: keyboard-interactive devs
debug1: auth2_challenge: user=csillag devs=
debug1: kbdint_alloc: devices 'pam'
debug1: auth2_challenge_start: trying authentication method 'pam'
debug1: do_cleanup
debug1: PAM: cleanup
Segmentation fault
-----------------------------------------------------------------
(I was trying to SSH into an account named "csillag" I have just
created.)
* * *
The host is Debian Sarge, running the Debianised 2.6.8 kernel with the
SKAS3 patch (also from debian.)
The UML box is running a (quite minimal) sarge installation, too.
(And, I repeat, the kernel (whom I suspect to be the culprit)
is a 2.6.11. (both vanila the debian makes sshd crash the same way.)
* * *
Does anyone else see SSHD segfaults with 2.6.11?
Do you have any idea how should I fix this?
(I would not like to stuck to 2.4 kernels.)
Best wishes:
Kristof Csillag
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a projector? How fast can you ride your desk chair down the office luge track?
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