FW: Segfault with "net ads password"

[James Willard]

Title: Message

Hi All,

 

I'm still having the issues I've described below. I've tried to give as much detail as possible, and I'm hoping to help fix this segfault bug in what will become Samba 3. I don't believe that this problem is isolated to me and I do believe that it does affect every other user. Please help me and allow me to help the Samba project.

 

Thanks,

 

James Willard

[EMAIL PROTECTED]

 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of James Willard
Sent: Friday, November 01, 2002 6:04 PM
To: 'Esh, Andrew'; [EMAIL PROTECTED]
Subject: RE: Segfault with "net ads password"

Andrew,

 

It seems like you're right about the null pointer. Given the code block you mentioned, I rebuilt with --enable-krb5developer and ran gdb over it again with a breakpoint at net_ads_password() and displaying ads, ads->auth, and ads->auth.kdc_server. The following is the output from gdb at the line just before line 885 where kerberos_set_password() is called:

 

3: ads->auth = {realm = 0x0, password = 0x0, user_name = 0x0, kdc_server = 0x0, flags = 0, time_offset = 0}
2: ads->auth.kdc_server = 0x0
1: ads = (ADS_STRUCT *) 0x81af8e0

And of course, the call itself... null values and all... (usernames/passwords substituted)

 

(gdb)
kerberos_set_password (kpasswd_server=0x0, auth_principal=0x815c560 [EMAIL PROTECTED],
    auth_password=0x815c57c "Adminpass", target_principal=0xbffffbe5 [EMAIL PROTECTED],
    new_password=0x81535a0 "User", time_offset=0) at libads/krb5_setpw.c:470
470         return krb5_set_password(kpasswd_server, target_principal, new_password, time_offset);

Ok, this officially goes beyond my abilities... who maintains the "net ads" portion of Samba that could help me look into this further?

 

Thanks,

 

James Willard

[EMAIL PROTECTED]

 

-----Original Message-----
From: Esh, Andrew [mailto:[EMAIL PROTECTED]]
Sent: Friday, November 01, 2002 4:54 PM
To: 'James Willard'; [EMAIL PROTECTED]
Subject: RE: Segfault with "net ads password"
Importance: High

Looks like this bit of code is failing:

utils/net_ads.c, lines 877-886, function "net_ads_password"

    /* use the realm so we can eventually change passwords for users
    in realms other than default */
    if (!(ads = ads_init(realm, NULL, NULL))) return -1;

    asprintf(&prompt, "Enter new password for %s:", argv[0]);

    new_password = getpass(prompt);

    ret = kerberos_set_password(ads->auth.kdc_server, auth_principal,
                                auth_password, argv[0], new_password, ads->auth.time_offset);

the last line is reached with "ads->auth.kdc_server" as a bad (null?) pointer.  The "ads_init" function creates the ads structure and zeroes it. It doesn't appear to me as though "ads_init" initializes ads->auth, and I don't see where else it gets set.

-----Original Message-----
From: James Willard [mailto:[EMAIL PROTECTED]]
Sent: Friday, November 01, 2002 2:23 PM
To: [EMAIL PROTECTED]
Subject: RE: Segfault with "net ads password"

And as a follow-up to myself... The following is a backtrace from gdb:

Program received signal SIGSEGV, Segmentation fault.
0x080ec329 in interpret_addr ()
(gdb) bt
#0  0x080ec329 in interpret_addr ()
#1  0x080ec462 in interpret_addr2 ()
#2  0x080efbe0 in open_udp_socket ()
#3  0x0810f56c in krb5_set_password ()
#4  0x0810fdbf in kerberos_set_password ()
#5  0x0806b17c in net_ads_password ()
#6  0x08068690 in net_run_function ()
#7  0x0806b51c in net_ads ()
#8  0x08068690 in net_run_function ()
#9  0x080697d3 in main ()
#10 0x42017589 in __libc_start_main () from /lib/i686/libc.so.6

Thanks,

James Willard
[EMAIL PROTECTED]

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of James
Willard
Sent: Friday, November 01, 2002 2:12 PM
To: [EMAIL PROTECTED]
Subject: Segfault with "net ads password"

Hi,

I'm trying to troubleshoot a problem I've been having for the past
several weeks with "net ads password" attempting to change a users'
password. I'm using the Samba 3.0 CVS tree updated this morning (even
though there has been no difference in behavior in the past month or
so). I'm running:

net ads password [EMAIL PROTECTED] -U [EMAIL PROTECTED]%Password

I receive a prompt:

Enter new password for [EMAIL PROTECTED]:

I enter a password and then it segfaults. Below are excerpts from a
strace:

...
write(3, "kadmin", 6)                   = 6
write(3, "\0\0\0\10", 4)                = 4
write(3, "changepw", 8)                 = 8
...
write(3, "\0\0\0\0", 4)                 = 4
write(3, NULL, 0)                       = 0
fcntl64(3, F_SETLKW, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) =
0
close(3)                                = 0
time(NULL)                              = 1036176903
gettimeofday({1036176903, 994633}, NULL) = 0 gettimeofday({1036176903,
995109}, NULL) = 0
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

The operating system is RedHat Linux 7.3 on a PIII with krb5-1.2.5 and
openldap-2.1.4

What other information would be useful in tracking down this bug?

Thanks,

James Willard
[EMAIL PROTECTED]