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Re: nmap on sparc/linux
From: Tom Duffy <tduffy () sun com>
Date: Mon, 16 Dec 2002 15:10:39 -0800

On Mon, 2002-12-16 at 14:20, Fyodor wrote:

Thanks for all the debug info.  I have a few questions:

o Do this bus error happen at every execution, or is it an
  intermittent problem?

happens every time.

o The stack trace you sent involved a crash in the Nmap ping routine.
  Does it crash when you use -P0?  If so, please send a stack trace
  like the one you sent last time.  That can help us determine whether
  the problem is in Libpcap or the Nmap ping code.

(gdb) set args -P0 deedeed
(gdb) run
Starting program: /root/nmap-3.10ALPHA4/nmap -P0 deedeed

Starting nmap V. 3.10ALPHA4 ( www.insecure.org/nmap/ )

Program received signal SIGBUS, Bus error.
0x0003b354 in bpf_filter (pc=0xd8c18, p=0xd8490 "ÿÿÿÿÿÿ", wirelen=42, 
    buflen=42) at bpf_filter.c:300
300                             continue;
Current language:  auto; currently c
(gdb) bt
#0  0x0003b354 in bpf_filter (pc=0xd8c18, p=0xd8490 "ÿÿÿÿÿÿ", wirelen=42, 
    buflen=42) at bpf_filter.c:300
#1  0x00032ae4 in pcap_read_packet (handle=0xd82f0, 
    callback=0x33a28 <pcap_oneshot>, 
    userdata=0xeffb8940 "ïû\211ÀØ\214\v\233ïû\211è") at pcap-linux.c:451
#2  0x00033a74 in pcap_next (p=0xd82f0, h=0xeffb89c0) at pcap.c:112
#3  0x0001d3a4 in readip_pcap(pcap*, unsigned*, long) (pd=0xd82f0, 
    len=0xeffb8a4c, to_usec=6000000) at tcpip.cc:1385
#4  0x00028e9c in get_syn_results (target=0x8dfd0, scan=0xc23d0, 
    ss=0xefffb440, pil=0xefffb1b0, portlookup=0xeffbb1b0, pd=0xd82f0, 
    sequences=0xeffb8ff0, scantype=SYN_SCAN) at scan_engine.cc:367
#5  0x00029e50 in pos_scan(Target*, unsigned short*, int, stype) (
    target=0x8dfd0, portarray=0x850ec, numports=1605, scantype=SYN_SCAN)
    at scan_engine.cc:986
#6  0x00014dec in nmap_main(int, char**) (argc=3, argv=0x8dfd0) at nmap.cc:861
#7  0x000127e8 in main (argc=3, argv=0xeffffcc4, envp=0xeffffcd4)
    at main.cc:169

o If you compile the tcpdump & libpcap from tcpdump.org with the same compiler,
  does it work for you or crash?

choller tcpdump # tcpdump --version
tcpdump version 3.7.1
libpcap version 0.7
Usage: tcpdump [-adeflnNOpqRStuvxX] [ -c count ] [ -C file_size ]
                [ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]
                [ -T type ] [ -w file ] [ -E algo:secret ] [ expression
choller tcpdump # tcpdump > /dev/null
tcpdump: listening on eth0

8 packets received by filter
0 packets dropped by kernel

I.E. it works fine.




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