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czhang
n00b
Joined: 24 Aug 2002
Posts: 16
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 Posted: Sun Jul 27, 2003 4:54 am Post subject: nss_ldap segment fault, need suggestion to resolve |
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package versions:
nss_ldap 207-r1
openldap 2.3.2-r1
glibc 2.3.2-r1
I tried to use LDAP to replace NIS. Now when I test with 'getent -s ldap passwd', I will get 'Segmentation fault'.
My ldap.conf is | Code: | host dragoon
base dc=wlb2,dc=n2pcorp,dc=com
scope one
pam_filter objectclass=posixaccount
pam_login_attribute uid
pam_member_attribute gid
pam_password md5
nss_base_passwd ou=People,dc=wlb2,dc=n2pcorp,dc=com?one
nss_base_shadow ou=People,dc=wlb2,dc=n2pcorp,dc=com?one
nss_base_group ou=Group,dc=wlb2,dc=n2pcorp,dc=com?one
nss_base_hosts ou=Hosts,dc=wlb2,dc=n2pcorp,dc=com?one
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I used gdb to see what's going on. First 10 stack frames are ...
| Code: | #0 0x4005e7b2 in _IO_vfprintf (s=0xbf800250, format=0x4014b99a "(&(objectclass=%s)(%s=%s))",
ap=0xbf80037c "\215¹\024@h¸\024@'µ\024@¨\003\200¿\223H\024@ÀÉ\024@£¸\024@\234\003\200¿£¸\024@¬Ç\024@¨Ê\024@È\003\200¿\025\214\024@£¸\024@") at vfprintf.c:231
#1 0x40080476 in _IO_vsnprintf (string=0x40151560 "", maxlen=1024,
format=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@",
args=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@") at vsnprintf.c:130
#2 0x400687c4 in __snprintf (
s=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@",
maxlen=3212837456,
format=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@") at snprintf.c:37
#3 0x40147d2d in _nss_ldap_init_filters () at ldap-schema.c:134
#4 0x40142b53 in do_open () at ldap-nss.c:1033
#5 0x40143dec in _nss_ldap_search_s (args=0xbf800d20, filterprot=0x40155160 "(&(objectclass=ipHost)(cn=%s))",
sel=LM_HOSTS, sizelimit=1, res=0xbf800cd0) at ldap-nss.c:2285
#6 0x40144364 in _nss_ldap_getbyname (args=0xbf800d20, result=0xbf800250,
buffer=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@", buflen=3212837456, errnop=0xbf800250,
filterprot=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@", sel=3212837456, parser=0xbf800250) at ldap-nss.c:2635
#7 0x4014673d in _nss_ldap_gethostbyname2_r (
name=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@", af=2, result=0xbf800250,
buffer=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@", buflen=3212837456, errnop=0xbf800250, h_errnop=0xbf800e1c) at ldap-hosts.c:281
#8 0x401467ba in _nss_ldap_gethostbyname_r (
name=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@", result=0xbf800250,
buffer=0xbf800250 "\001\200û`\025\025@`\025\025@`\025\025@`\025\025@`\025\025@_\031\025@`\025\025@_\031\025@", buflen=3212837456, errnop=0xbf800250, h_errnop=0xbf800250) at ldap-hosts.c:304
#9 0x400ff468 in __gethostbyname_r (name=0xbf800e40 "archon", resbuf=0xbf800d20, buffer=0x8327c50 "",
buflen=1024, result=0xbf800e18, h_errnop=0xbf800e1c) at getXXbyYY_r.c:219
#10 0x401728bd in ldap_pvt_gethostbyname_a () from /usr/lib/libldap.so.2
#11 0x40172a98 in ldap_pvt_get_fqdn () from /usr/lib/libldap.so.2
#12 0x40171418 in ldap_int_initialize () from /usr/lib/libldap.so.2
#13 0x4015e4e8 in ldap_create () from /usr/lib/libldap.so.2
#14 0x4015e60b in ldap_init () from /usr/lib/libldap.so.2
#15 0x40142de2 in do_open () at ldap-nss.c:1070
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I should say I am not familiar with nss_ldap code at all. I checked func _nss_ldap_init_filters() and failed to see how snprintf will cause a segment fault.
There is more I don't understand. The total frames are 31859 as shown below. Even if assuming nss_ldap's code rely on recursive, I still don't think it requires so many stack frames to do what it should do. Or this cause stack overflow? | Code: | #31856 0x400bf610 in getpwent () at getXXent.c:84
#31857 0x08049ffc in passwd_keys (number=0, key=0xbffffc64) at getent.c:408
#31858 0x0804a930 in main (argc=1, argv=0xbffffc54) at getent.c:798
#31859 0x4002c856 in __libc_start_main (main=0x804a7f0 <main>, argc=4, ubp_av=0xbffffc54,
init=0x804aee0 <__libc_csu_init>, fini=0x804af10 <__libc_csu_fini>, rtld_fini=0x40013220 <_rtld_local>,
stack_end=0xbf800250) at ../sysdeps/generic/libc-start.c:152 |
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scape
n00b
Joined: 22 Oct 2002
Posts: 16
Location: Stuttgart, Germany
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| Posted: Mon Aug 18, 2003 8:12 pm Post subject: Re: nss_ldap segment fault, need suggestion to resolve |
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same here, has this been resolved yet?
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