[panda-users] System calls

[Julia Gustafsson]

Thank you very much for your help!

Regarding: *"My guess is that this is related to your LD_LIBRARY_PATH. Make
sure that the panda_prov_tracer_syscallents_linux-* libraries are compiled
and their location is included in your LD_LIBRARY_PATH." *
Where should I specify this LD_LIBRARY_PATH? And I also don't really
understand how to compile the files more than using the script for building
PANDA?

Best Regards,
Julia

2016-02-26 22:04 GMT+01:00 Manolis Stamatogiannakis <mstamat at gmail.com>:

>
>
> 2016-02-26 16:01 GMT+01:00 Julia Gustafsson <gustafssonjulia92 at gmail.com>:
>
>> Hello again,
>>
>> Thank you for your help. I was able to build PANDA with the prov_tracer
>> plugin, but I have some more questions.
>>
>> My first question is how I'm suppose to run it. You wrote:
>> *"So make sure you try prov_tracer (which depends on linux_osi) on 32
>> bit."*
>> Does this mean that I should run it on i386-softmmu instead of
>> x86_64-softmmu? I'm running a 32 bit Debian Squeeze (i386) as the guest
>> system, and the host system is a 64 bit Ubuntu 14.04.
>>
>
> Yes, you should use i386-softmmu.
> For introspection to work, you need to know the pointer/integer size for
> the running OS. Those are defined at compile-time based on the underlying
> architecture. Dynamically setting them based on the running OS would
> unecessarily complicate the code. It would probably also make the code run
> a bit less efficiently (less room for compiler optimizations).
>
>
>
>>
>> My second question is what the arguments to the plugins should be. I did
>> 2 recordings; one on i386-softmmu and one on x86_64-softmmu, and I got
>> these errors when I tried to run them with the prov_tracer plugin(without
>> arguments):
>> *i386-softmmu:*
>> *"i386-softmmu/qemu-system-i386 -replay echotestcrashi386 -panda osi
>> -panda osi_linux:kconf_file=kernelinfo.conf,kconf_g -panda prov_tracer*
>>
>> *.....ERROR(osi_linux.cpp:init_plugin): Failed to read kernel info from
>> group "debian-3.2.65-i686" of file "kernelinfo.conf".Fail. init_fn returned
>> 0FAIL: Unable to load plugin
>> `/home/parallels/Documents/PANDA/panda-master/qemu/i386-softmmu/panda_plugins/panda_osi_linux.so'Aborted
>> (core dumped)"*
>>
>>
> kernelinfo.conf contains "kernel offset profiles" which are used by the
> introspection code. You should specify which profile from kernelifno.conf
> should be used. E.g. *-panda
> osi_linux:kconf_file=kernelinfo.conf,kconf_group=debian-3.2.63-i686*. The
> "closer" it is to the kernel version you run, the better chances for it to
> work.
>
> If nothing seems to work, you will have to extract a profile specific to
> your kernel. (see
> https://github.com/m000/panda/tree/prov_tracer/qemu/panda_plugins/osi_linux/utils/kernelinfo
> )
>
>
>
>> *x86_64-softmmu:*
>>
>> "x86_64-softmmu/qemu-system-x86_64 -m 256 -replay echotestcrash -panda
>> osi -panda osi_linux:kconf_file=kernelinfo.conf,kconf_group=my_kernel_info
>> -panda prov_tracer
>>
>> .....
>>
>> ERROR(prov_tracer.cpp:init_plugin):
>> panda_prov_tracer_syscallents_linux-x86_64.so: cannot open shared object
>> file: No such file or directory
>>
>> Fail. init_fn returned 0
>>
>> FAIL: Unable to load plugin
>> `/home/parallels/Documents/PANDA/panda-master/qemu/x86_64-softmmu/panda_plugins/panda_prov_tracer.so'
>>
>> Aborted (core dumped)"
>>
>>
>>
> My guess is that this is related to your LD_LIBRARY_PATH. Make sure that
> the panda_prov_tracer_syscallents_linux-* libraries are compiled and
> their location is included in your LD_LIBRARY_PATH.
>
> Cheers,
> M.
>
>
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