My agent crashes with segmentation fault on snmpwalk

Hello,

 

I have a problem with my snmp agent in Net-SNMP (tested with versions
5.6.2.1 & 5.7.3) my agent crashes when responding to snmpwalk. When it
reaches the end of my MIB tree it gives segmentation fault

 

Steps to replicate the problem:

 

snmpwalk -m ALL -v1 -cpublic localhost enterprises.XXXXX

 

NOTE: XXXXX stands for my enterprise ID

 

 

snmpd response:

 

SNMPv2-SMI::enterprises.XXXXX.1.1.1.1.0 = STRING: "-100.0 dBm"

SNMPv2-SMI::enterprises.XXXXX.1.1.1.2.0 = INTEGER: 3

 

.

. more messages 

.

 

SNMPv2-SMI::enterprises.XXXXX.1.1.15.8.0 = STRING: "+3.0 A"

SNMPv2-SMI::enterprises.XXXXX.1.1.16.1.0 = STRING: "not-initialized"

SNMPv2-SMI::enterprises.XXXXX.1.1.17.1.0 = INTEGER: 1

Timeout: No Response from localhost

 

I executed snmp by means of gdb and get this output:

 

Received 46 byte packet from UDP: [127.0.0.1]:58230->[127.0.0.1]:161

0000: 30 2C 02 01  00 04 06 70  75 62 6C 69  63 A1 1F 02    0,.....public...

0016: 04 7D 9F C1  6C 02 01 00  02 01 00 30  11 30 0F 06    .}..l......0.0..

0032: 0B 2B 06 01  04 01 82 B5  2E 01 01 11  05 00          .+............

 

 

Sending 49 bytes to UDP: [127.0.0.1]:58230->[127.0.0.1]:161

0000: 30 2F 02 01  00 04 06 70  75 62 6C 69  63 A2 22 02    0/.....public.".

0016: 04 7D 9F C1  6C 02 01 00  02 01 00 30  14 30 12 06    .}..l......0.0..

0032: 0D 2B 06 01  04 01 82 B5  2E 01 01 11  01 00 02 01    .+..............

0048: 01                                                    .

 

 

Received 48 byte packet from UDP: [127.0.0.1]:58230->[127.0.0.1]:161

0000: 30 2E 02 01  00 04 06 70  75 62 6C 69  63 A1 21 02    0......public.!.

0016: 04 7D 9F C1  6D 02 01 00  02 01 00 30  13 30 11 06    .}..m......0.0..

0032: 0D 2B 06 01  04 01 82 B5  2E 01 01 11  01 00 05 00    .+..............

 

ERROR:: FILE NOT FOUND 

ERROR:: FILE NOT FOUND 

ERROR:: FILE NOT FOUND

...

 

ERROR:: FILE NOT FOUND

 

(Those messages are generated by my own programs but I do not know which one
is snmpd trying to execute at this point)

 

Program received signal SIGSEGV, Segmentation fault.

_IO_fgets (buf=buf@entry=0xbefff5ec "\030\324\023", n=n@entry=60,
fp=fp@entry=0x0) at iofgets.c:50

50      iofgets.c: No such file or directory.

 

 

gdb Backtrace:

 

Program received signal SIGSEGV, Segmentation fault.

_IO_fgets (buf=buf@entry=0xbefff5ec "\030\324\023", n=n@entry=60,
fp=fp@entry=0x0) at iofgets.c:50

50      iofgets.c: No such file or directory.

(gdb) bt

#0  _IO_fgets (buf=buf@entry=0xbefff5ec "\030\324\023", n=n@entry=60,
fp=fp@entry=0x0) at iofgets.c:50

#1  0xb6db1240 in eventTable1_handler (handler=<optimized out>,
reginfo=<optimized out>, reqinfo=0x109e20, requests=0x13d418) at
eventTable1.c:176

#2  0xb6f9f602 in netsnmp_call_handler (requests=0x13d418, reqinfo=0x109e20,
reginfo=0x52338, next_handler=0x52310) at agent_handler.c:526

#3  netsnmp_call_next_handler (current=current@entry=0x52698,
reginfo=reginfo@entry=0x52338, reqinfo=reqinfo@entry=0x109e20,
requests=requests@entry=0x13d418) at agent_handler.c:640

#4  0xb6f9763e in table_helper_handler (handler=0x52698, reginfo=0x52338,
reqinfo=<optimized out>, requests=0x13d418) at helpers/table.c:712

#5  0xb6f9f214 in netsnmp_call_handler (requests=0x13d418, reqinfo=0x109e20,
reginfo=0x52338, next_handler=0x52698) at agent_handler.c:526

#6  netsnmp_call_handlers (reginfo=0x52338, reqinfo=0x109e20,
requests=0x13d418) at agent_handler.c:611

#7  0xb6fa8940 in handle_var_requests (asp=asp@entry=0x12a350) at
snmp_agent.c:2676

#8  0xb6fa8c70 in handle_getnext_loop (asp=asp@entry=0x12a350) at
snmp_agent.c:3122

#9  0xb6fa92ba in handle_pdu (asp=asp@entry=0x12a350) at snmp_agent.c:3451

#10 0xb6fa93b6 in netsnmp_handle_request (asp=asp@entry=0x12a350,
status=status@entry=0) at snmp_agent.c:3281

#11 0xb6fa9760 in handle_snmp_packet (op=<optimized out>, session=<optimized
out>, reqid=<optimized out>, pdu=0x157b40, magic=0x0) at snmp_agent.c:1987

#12 0xb6cf21dc in _sess_process_packet (sessp=sessp@entry=0x10dc28,
sp=sp@entry=0x1450f8, isp=isp@entry=0x1354d8,
transport=transport@entry=0xf26a0, opaque=opaque@entry=0x127e58,
olength=olength@entry=36,

    packetptr=packetptr@entry=0x147b38 "0.\002\001", length=48) at
snmp_api.c:5437

#13 0xb6cf2a6c in _sess_read (sessp=sessp@entry=0x10dc28,
fdset=fdset@entry=0xbefffa40) at snmp_api.c:5872

#14 0xb6cf35e4 in snmp_sess_read2 (sessp=sessp@entry=0x10dc28,
fdset=fdset@entry=0xbefffa40) at snmp_api.c:5904

#15 0xb6cf3618 in snmp_read2 (fdset=fdset@entry=0xbefffa40) at
snmp_api.c:5500

#16 0x00013436 in receive () at snmpd.c:1328

#17 main (argc=<optimized out>, argv=<optimized out>) at snmpd.c:1115

(gdb) q

 

 

Thanks you in advance,

Javier

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