[Bug 814569] Re: Segmentation fault in augtool and augeas.rb

[David Caro]

I was able to reproduce this error on centos 6.5, when having a >24 MB
/etc/sysconfig/nfs configuration file, any tool using augeas-libs just
broke with segmentation fault.

Using augeas-libs-1.0.0-5.el6_5.1.x86_64

Fixed just trimming down the faulty configuration file as a workaround.

Reproduced easily just appending data into the file until it's big
enough (17 MB was enough for me). It does not matter if you add real
configuration entries or just comments.

This is what I used to test it:
  for i in $(seq 1000000); do echo "#WHATEVER=NOTHIG" >> /etc/sysconfig/nfs; done

After that running augtool:
  # augtool
  Segmentation fault

With gdb:
 # gdb augtool
 GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1) 
 Copyright (C) 2010 Free Software Foundation, Inc.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
 and "show warranty" for details.
 This GDB was configured as "x86_64-redhat-linux-gnu".
 For bug reporting instructions, please see:
 <http://www.gnu.org/software/gdb/bugs/>...
 Reading symbols from /usr/bin/augtool...(no debugging symbols found)...done.
 Missing separate debuginfos, use: debuginfo-install augeas-1.0.0-5.el6_5.1.x86_64
 (gdb) run
 Starting program: /usr/bin/augtool 
 
 Program received signal SIGSEGV, Segmentation fault.
 0x00007ffff7bbe2a1 in ?? () from /usr/lib64/libaugeas.so.0
 (gdb) 


And attached an strace of the run (don't get scared by the strange config files please :) ).

** Attachment added: "strace log"
   https://bugs.launchpad.net/ubuntu/+source/augeas/+bug/814569/+attachment/4100598/+files/strace.log

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Title:
  Segmentation fault in augtool and augeas.rb

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