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Bug 86307 - Netlogon causes DoS since upgrade to latest update
Summary: Netlogon causes DoS since upgrade to latest update
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: samba
Version: 7.2
Hardware: athlon
OS: Linux
Target Milestone: ---
Assignee: Jay Fenlason
QA Contact: David Lawrence
: 87969 (view as bug list)
Depends On:
TreeView+ depends on / blocked
Reported: 2003-03-19 10:58 UTC by Peter Surda
Modified: 2014-08-31 23:24 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2003-04-07 18:38:29 UTC

Attachments (Terms of Use)
Extracted from's patch 2.2.7->2.2.7a (deleted)
2003-03-19 11:00 UTC, Peter Surda
no flags Details | Diff

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2003:137 high SHIPPED_LIVE : New samba packages fix security vulnerability 2003-04-08 04:00:00 UTC
Red Hat Product Errata RHSA-2003:138 high SHIPPED_LIVE Critical: samba security update 2003-04-07 04:00:00 UTC

Description Peter Surda 2003-03-19 10:58:50 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2) Gecko/20030102

Description of problem:
I upgraded to latest samba last night, and since then netlogon stopped working,
it causes smbd to start eating lots of CPU. Logs say (repeatedly many times per

[2003/03/19 11:10:01, 0] lib/util_str.c:string_sub(1217)
  ERROR: string overflow by 1 in string_sub(%g, 7)

This comes from having
logon script = %g.bat
in smb.conf

I traced this to probably be a known error fixed in 2.2.7a. I extracted the fix
from the patch from and am rebuilding the RPM now to see if it helps.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. put something in logon script
2. start samba
3. any machine trying to login should trigger the bug

Actual Results:  Samba starts logging lots of errors (see above) and eat lots of
CPU. People report they can't login.

Expected Results:  There should be no errors.

Additional info:

I'm waiting for the rebuild to complete, will report later.

Comment 1 Peter Surda 2003-03-19 11:00:42 UTC
Created attachment 90658 [details]
Extracted from's patch 2.2.7->2.2.7a

This should fix the bug, I'm testing right now.

Comment 2 Peter Surda 2003-03-19 11:03:56 UTC
Ok, the test was sucessful, people report netlogon working, I don't get any more
errors and smbd isn't DoSed anymore. Please apply.

Comment 3 Mark J. Cox 2003-04-07 18:38:29 UTC
An errata has been issued which should help the problem described in this bug report. 
This report is therefore being closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, please follow the link below. You may reopen 
this bug report if the solution does not work for you.

Comment 4 Daniel F. Dickinson 2003-04-15 02:13:25 UTC
*** Bug 87969 has been marked as a duplicate of this bug. ***

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