Can you provide example code that fails?
Marco Hoehle wrote:
> Hello,
>
>
> running on CentOS 5.3 / RHEL5.3 32 and 64bit , cf3 trunk build 434.
> When compiling cf3 without special options the cf-agent binary is
> throwing a segfault after every run.
> When disabling FORTIFY_SOURCE with CFLAGS="-g -O2 -D_FORTIFY_SOURCE=0"
> the binary is running somewhat stable ... but on configuration errors it
> still reacts sometimes with segmentation faults. The bad side is that
> cf-agent intends to go into failsafe mode but never does because of the
> segfault.
> Below you can find some examples.
>
> -- this seems to be reproducable -------------------------
>
> looks like when cf-agent is called with the -f option and through the
> path variable (not direct path) it is segfaulting ...
> Same happens when instead of the -f option an broken promise is
> configured. The agent will segfault.
>
>> this is fine
> [r...@mir inputs]# /var/cfengine/bin/cf-agent -K -f testing/hello_world.cf
> R: Hello World
>
>> this is bad
> r...@mir inputs]# cf-agent -K -f testing/hello_world.cf
> R: Hello World
> *** buffer overflow detected ***: cf-agent terminated
> ======= Backtrace: =========
> /lib/i686/nosegneg/libc.so.6(__chk_fail+0x41)[0x907f61]
> /lib/i686/nosegneg/libc.so.6(__strcpy_chk+0x43)[0x907383]
> cf-agent[0x809f95e]
> cf-agent[0x809fefa]
>
> another example.
> ----- wrong defined body should not finish in a segfault of cf-agent
> --------------------
>
> [r...@mir inputs]# cf-agent -K
> cf3:/var/cfengine/inputs/sys/main.cf:3,1: Redefinition of body control
> for common is a broken promise, near token '{'
> cf3:/var/cfengine/inputs/sys/main.cf:12,20: Redefinition of input list
> (broken promise), near token '}'
> Summarizing promises as text to /var/cfengine/inputs/promises.cf.txt
> Summarizing promises as html to /var/cfengine/inputs/promises.cf.html
> cf-agent was not able to get confirmation of promises from cf-promises,
> so going to failsafe
> *** buffer overflow detected ***: cf-agent terminated
> ======= Backtrace: =========
> /lib/i686/nosegneg/libc.so.6(__chk_fail+0x41)[0x907f61]
> /lib/i686/nosegneg/libc.so.6(__strcpy_chk+0x43)[0x907383]
> cf-agent[0x809f95e]
> cf-agent[0x809fefa]
> cf-agent[0x804cba4]
> /lib/i686/nosegneg/libc.so.6(__libc_start_main+0xdc)[0x835e8c]
> cf-agent[0x804ad51]
>
> well it never goes into failsafe because of the segfault and my clients
> will become unmanaged through this.
>
> --------------------------------------------------
>
>
> and yet another example. I was trying to fill an slist with
> execresult("/bin/ls /mydir/*.cf","noshell") and divine what. The
> cf-agent process dies with a segmentation fault .... but this one is
> different than the others ;)
>
> when using execresult to get a dynamic configfile list all processes do
> segfaults
> cf3 > Parsing file /var/cfengine/inputs/sys/update.cf
> cf3 > Parsing file /var/cfengine/inputs/sys/library.cf
> cf3 > Parsing file /var/cfengine/inputs/sys/server.cf
> cf3 > Parsing file /var/cfengine/inputs/sys/cfengine_maintenance.cf
> Segmentation fault
>
> ------ details ---
> GetVariable(global,files_unixnews): using scope 'global' for variable
> 'files_unixnews'
> return final variable type=slist, value={
> /bin/ls: /var/cfengine/unixnews.ch/*.cf: No such file or directory}
> ExpandPrivateRval(scope=sys,type=/)
> Cannot append X to rval-list [(null)]
> Segmentation fault
> -------------------------
>
>
> ------- slist for dynmic variables finishes with segfault
> ---------------------
> GetVariable(global,files_unixnews): using scope 'global' for variable
> 'files_unixnews'
> return final variable type=slist, value={
> hostname_test.cf main.cf}
> ExpandPrivateRval(scope=sys,type=n)
> Cannot append X to rval-list [(null)]
> Segmentation fault
>
>
>
> Thanks in advance for reviewing.
> Kind regards
> marco
>
>
>
>
>
>
>
>
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--
Mark Burgess
-------------------------------------------------
Professor of Network and System Administration
Oslo University College, Norway
Personal Web: http://www.iu.hio.no/~mark
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