I'm using ../libnetfilter_conntrack-0.0.31, conntrack 1.00beta2, and
libnfnetlink(svn). Building against kernel 2.6.16.29.
For some reason, I'm getting a segfault in nfct_conntrack_compare. It seems as
if the memory pointed to by ct1 is invalid, the first time that the compare
is called. Has anyone else seen this?
This happens (the segfault) when I do conntrack -L or conntrack -E (After the
first event has arrived).
(gdb) [ezust@pocky] /home/ezust/presinet/projects/conntrack-vanilla> sudo gdb
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This GDB was configured as "i486-linux-gnu".
Using host libthread_db library "/lib/tls/libthread_db.so.1".
Breakpoint 1 at 0x804a0ad: file conntrack.c, line 606.
main (argc=2, argv=0xbfeb7424) at conntrack.c:606
606 unsigned int command = 0, options = 0;
Program received signal SIGSEGV, Segmentation fault.
0xb7f85731 in nfct_conntrack_compare (ct1=0x15f24, ct2=0xbfeb5138,
cmp=0xb7fb8ff4) at libnetfilter_conntrack.c:933
933 int cop1 = ct1->tuple[NFCT_DIR_ORIGINAL].protonum;
(gdb) list
928 if (l3proto && !l3proto->compare(ct1, ct2, l3flags))
929 return 0;
930 }
931
932 if (l4flags) {
933 int cop1 = ct1->tuple[NFCT_DIR_ORIGINAL].protonum;
934 int cop2 = ct2->tuple[NFCT_DIR_ORIGINAL].protonum;
935 if (cop1 != 0 && cop2 != 0 && cop1 != cop2)
936 return 0;
937 int crp1 = ct1->tuple[NFCT_DIR_REPLY].protonum;
(gdb) ct1
Undefined command: "ct1". Try "help".
(gdb) p ct1
$1 = (struct nfct_conntrack *) 0x15f24
(gdb) p *ct1
Cannot access memory at address 0x15f24
(gdb) p ct1
$2 = (struct nfct_conntrack *) 0x15f24
(gdb) p ct2
$3 = (struct nfct_conntrack *) 0xbfeb5138
(gdb) p *ct2
$4 = {tuple = {{src = {v4 = 520161802, v6 = {520161802, 0, 0, 0}}, dst = {v4 =
4278258186, v6 = {4278258186, 0, 0, 0}}, l3protonum = 2 '\002', protonum =
17 '\021',
l4src = {all = 35328, tcp = {port = 35328}, udp = {port = 35328}, icmp =
{type = 0 '\0', code = 138 '\212', id = 0}, sctp = {port = 35328}}, l4dst = {
all = 35328, tcp = {port = 35328}, udp = {port = 35328}, icmp = {type
= 0 '\0', code = 138 '\212', id = 0}, sctp = {port = 35328}}}, {src = {v4 =
4278258186,
v6 = {4278258186, 0, 0, 0}}, dst = {v4 = 520161802, v6 = {520161802,
0, 0, 0}}, l3protonum = 2 '\002', protonum = 17 '\021', l4src = {all = 35328,
tcp = {
port = 35328}, udp = {port = 35328}, icmp = {type = 0 '\0', code =
138 '\212', id = 0}, sctp = {port = 35328}}, l4dst = {all = 35328, tcp =
{port = 35328},
udp = {port = 35328}, icmp = {type = 0 '\0', code = 138 '\212', id =
0}, sctp = {port = 35328}}}}, timeout = 21, mark = 0, status = 8, use = 1, id
= 354,
protoinfo = {tcp = {state = 0 '\0'}}, counters = {{packets = 1, bytes =
257}, {packets = 0, bytes = 0}}, nat = {min_ip = 0, max_ip = 0, l4min = {all
= 0, tcp = {
port = 0}, udp = {port = 0}, icmp = {type = 0 '\0', code = 0 '\0', id
= 0}, sctp = {port = 0}}, l4max = {all = 0, tcp = {port = 0}, udp = {port =
0}, icmp = {
type = 0 '\0', code = 0 '\0', id = 0}, sctp = {port = 0}}}}
(gdb) p *ct1
Cannot access memory at address 0x15f24
(gdb) where
#0 0xb7f85731 in nfct_conntrack_compare (ct1=0x15f24, ct2=0xbfeb5138,
cmp=0xb7fb8ff4) at libnetfilter_conntrack.c:933
#1 0xb7f84ebd in nfct_default_conntrack_display (arg=0xbfeb5138, flags=253,
type=2, data=0xb7fb8ff4) at libnetfilter_conntrack.c:721
#2 0xb7f8492f in nfct_conntrack_netlink_handler (cth=0x804e148,
nlh=0xbfeb526c, arg=0x0) at libnetfilter_conntrack.c:579
#3 0xb7f8355c in callback_handler (nladdr=0xbfeb726c, n=0xbfeb526c,
arg=0x804e148) at libnetfilter_conntrack.c:75
#4 0xb7e48734 in nfnl_listen (nfnlh=0x804e008, handler=0xb7f834b4
<callback_handler>, jarg=0x804e148) at libnfnetlink.c:491
#5 0xb7f8601a in __nfct_dump_conntrack_table (cth=0x804e148, zero=0,
family=2) at libnetfilter_conntrack.c:1110
#6 0xb7f86047 in nfct_dump_conntrack_table (cth=0x804e148, family=2) at
libnetfilter_conntrack.c:1115
#7 0x0804adc3 in main (argc=2, argv=0xbfeb7424) at conntrack.c:882
--
Alan Ezust www.presinet.com
Presinet, inc alan.ezust@xxxxxxxxxxxx
Victoria, BC, Canada
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