Bug 11828 - WARNING: using gid -1 is a security risk
Summary: WARNING: using gid -1 is a security risk
Status: NEW
Alias: None
Product: Samba 4.1 and newer
Classification: Unclassified
Component: File services (show other bugs)
Version: 4.1.6
Hardware: All Linux
: P5 normal (vote)
Target Milestone: ---
Assignee: Samba QA Contact
QA Contact: Samba QA Contact
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-04-12 07:43 UTC by dhope0000
Modified: 2016-10-20 08:05 UTC (History)
2 users (show)

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Description dhope0000 2016-04-12 07:43:27 UTC 
First time bug submit so apologies if this is filed in the incorrect place. 

I recently setup and configured a domain controller and a file server with samba 4.1.6. (Come on Ubuntu apt repository) 

Authentication and accessing the drives is all okay and works, but i have an issue where users (connected in the domain) access to the "mapped drives" will periodically drop out. So i have log level turned on and when it happens to a particular user I decided to check the machine log level and see alot of entries with the following message;

[2016/03/25 12:33:55.602091, 1] ../source3/smbd/sec_ctx.c:85(become_gid)
WARNING: using gid -1 is a security risk

Initially I thought this had something to do with my configuration, I was advised that it could be a bug that only samba developers could fix. 

You can see my initial question here at http://ubuntuforums.org/showthread.php?t=2320166&p=13468767#post13468767

Any ideas? 

Thanks
Dan