Re: samplesshd: Segmentation fault

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

Hello Eugene,

I will try to understand what happened, because this is not a known issue.
I keep you in touch.

Regards,

Aris
Eugene Starozhilov wrote:
> Hello!
>
> I am trying to use libssh-0.3.4 for my project.  I will need a server 
> component. I tested sample for ssh client and server (smaplesshd and 
> sample).  During the connection samplesshd crashes with core dump:
>
> $gdb ./samplesshd /var/crash/core.6450
> GNU gdb Red Hat Linux (6.3.0.0-1.159.el4rh)
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
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> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu"...Using host 
> libthread_db library "/lib64/tls/libthread_db.so.1".
>
> Core was generated by `./samplesshd -p 1553'.
> Program terminated with signal 11, Segmentation fault.
> Reading symbols from 
> /mnt/LogVol06/starozhe/libssh/libssh/libssh.so.3...done.
> Loaded symbols for /mnt/LogVol06/starozhe/libssh/libssh/libssh.so.3
> Reading symbols from /usr/lib64/libz.so.1...done.
> Loaded symbols for /usr/lib64/libz.so.1
> Reading symbols from /lib64/libcrypto.so.4...done.
> Loaded symbols for /lib64/libcrypto.so.4
> Reading symbols from /lib64/tls/libc.so.6...done.
> Loaded symbols for /lib64/tls/libc.so.6
> Reading symbols from /usr/lib64/libgssapi_krb5.so.2...done.
> Loaded symbols for /usr/lib64/libgssapi_krb5.so.2
> Reading symbols from /usr/lib64/libkrb5.so.3...done.
> Loaded symbols for /usr/lib64/libkrb5.so.3
> Reading symbols from /lib64/libcom_err.so.2...done.
> Loaded symbols for /lib64/libcom_err.so.2
> Reading symbols from /usr/lib64/libk5crypto.so.3...done.
> Loaded symbols for /usr/lib64/libk5crypto.so.3
> Reading symbols from /lib64/libresolv.so.2...done.
> Loaded symbols for /lib64/libresolv.so.2
> Reading symbols from /lib64/libdl.so.2...done.
> Loaded symbols for /lib64/libdl.so.2
> Reading symbols from /lib64/ld-linux-x86-64.so.2...done.
> Loaded symbols for /lib64/ld-linux-x86-64.so.2
> #0  0x00000035e44697f1 in _int_malloc () from /lib64/tls/libc.so.6
> (gdb) bt
> #0  0x00000035e44697f1 in _int_malloc () from /lib64/tls/libc.so.6
> #1  0x00000035e446b6d2 in malloc () from /lib64/tls/libc.so.6
> #2  0x00000035e9a4d65b in CRYPTO_malloc () from /lib64/libcrypto.so.4
> #3  0x00000035e9a9c124 in EVP_DigestInit_ex () from /lib64/libcrypto.so.4
> #4  0x00000035e9a978f1 in RAND_SSLeay () from /lib64/libcrypto.so.4
> #5  0x00000035e9a97b26 in RAND_SSLeay () from /lib64/libcrypto.so.4
> #6  0x0000002a9556d985 in ssh_get_random (where=0x7fbffff520, len=13, 
> strong=0)
>     at /home/starozhe/libssh-0.3.4/libssh/dh.c:92
> #7  0x0000002a9557a0d1 in packet_send2 (session=0x506dc0) at 
> /home/starozhe/libssh-0.3.4/libssh/packet.c:466
> #8  0x0000002a9557a276 in packet_send (session=0x506dc0) at 
> /home/starozhe/libssh-0.3.4/libssh/packet.c:591
> #9  0x0000002a95576312 in ssh_message_auth_reply_default (msg=0x507940, 
> partial=0)
>     at /home/starozhe/libssh-0.3.4/libssh/messages.c:296
> #10 0x0000002a95577658 in ssh_message_reply_default (msg=0x507940) at 
> /home/starozhe/libssh-0.3.4/libssh/messages.c:744
> #11 0x0000000000401503 in main (argc=1, argv=0x7fbffff7b8) at 
> /home/starozhe/libssh-0.3.4/samplesshd.c:92
>
> It is Red Hat Enterprise Linux AS release 4 (Nahant Update 7)
> gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)
>
> Any help would be appreciated.
>
> By the way I found a small bug in the server.c code:
> variable  session->log_verbosity doesn't get set.
> That can be fixed by changing line 232
>  session->options = ssh_options_copy(ssh_bind->options);
> to
>  ssh_set_options(session, ssh_options_copy(ssh_bind->options));
>
> Regards,
> Eugene Starozhilov