Bug 14028 - segfault with python dnsserver.dnsserver($SERVER)
Summary: segfault with python dnsserver.dnsserver($SERVER)
Status: RESOLVED FIXED
Alias: None
Product: Samba 4.1 and newer
Classification: Unclassified
Component: DCE-RPCs and pipes (show other bugs)
Version: unspecified
Hardware: All All
: P5 normal (vote)
Target Milestone: ---
Assignee: Andrew Bartlett
QA Contact: Samba QA Contact
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-07-07 22:50 UTC by Douglas Bagnall
Modified: 2019-07-24 00:00 UTC (History)
0 users

See Also:

Attachments
a gdb traceback (485.06 KB, text/plain)
2019-07-07 23:00 UTC, Douglas Bagnall 		no flags Details
the pseudo-fuzzer that found this and other segfaults (24.09 KB, patch)
2019-07-07 23:04 UTC, Douglas Bagnall 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Douglas Bagnall 2019-07-07 22:50:58 UTC 

    


    


      



        
          Comment 1
        

        
          Douglas Bagnall

        

        
        

        
          2019-07-07 22:57:53 UTC
        

      






to reproduce, in an addc testenv:

  $ python3 -c'from samba.dcerpc.dnsserver import dnsserver; dnsserver("addc")'
  Segmentation fault

This is probably not very serious, but I am restricting access to it because I need to stop looking for a while.

    


    


      



        
          Comment 2
        

        
          Douglas Bagnall

        

        
        

        
          2019-07-07 23:00:50 UTC
        

      






Created attachment 15291 [details]
a gdb traceback

The reason I am not sure, is this traceback goes deeper than most of the python binding issues I am looking at, and I am not certain there is only a client side path to it.

    


    


      



        
          Comment 3
        

        
          Douglas Bagnall

        

        
        

        
          2019-07-07 23:04:26 UTC
        

      






Created attachment 15292 [details]
the pseudo-fuzzer that found this and other segfaults

This patch adds a test that throws arbitrary combinations off arguments at our python bindings, and looks for segfaults.

I have patches for all the problems it has found, except this one.

    


    


      



        
          Comment 4
        

        
          Douglas Bagnall

        

        
        

        
          2019-07-24 00:00:12 UTC
        

      






fixed in 0348dd4b31062b2cf12d19ec5515a309d1d9b470