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Re: samplesshd: Segmentation fault


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
welcome to change it and/or distribute copies of it under certain conditions.
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








Follow-Ups:
Re: samplesshd: Segmentation faultEugene Starozhilov <estarozhilov@xxxxxxxxx>
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