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 Forums >>  IDA Pro  >>  reversing huge elf-binary in IDA?

Topic created on: May 9, 2009 04:56 CDT by oxident .

Hi!

I'm a newbie trying to analyse a huge monolithic linux application using IDA 5.2.
The binary is about 40MB and IDA took a few hours to finish the initial analysis. Now I want to investigate a few things within the application but it seems that IDA has some problems with such large applications.

Until now I've only analyzed a few Windows apps and found it very useful to search for string references and jump to functions which refer to this string. But when trying to do so with this linux-binary, IDA doesn't find any references to any string (although the list of strings contains over 50k entries).

I'm also facing errors like "Command OpenXrefs failed"...

Am I doing something wrong here or does IDA really have problems analyzing such huge binaries?

  tOpO     May 9, 2009 12:24.44 CDT
It has nothing to do with file size... I've analyzed files bigger than that on IDA 5.2 without any problems.

Check that the ELF header uses standard values and replace them if not.

About the strings the problem could be that they are referenced with their absolute address so you should rebase the binary to the correct address.

Good luck with that! :)

  igorsk     May 10, 2009 17:22.00 CDT
If it uses PIC code, you might need to upgrade. From 5.3 whatsnew:
+ PC: added recognition of call+5/pop idiom for PIC code
+ PC: automatically recognize .got relative addressing for pic mode elf files

  oxident     May 12, 2009 09:20.13 CDT
Thanks for your suggestions!
So I guess it would be most convenient for me to try a later IDA version. From what I've seen on the IDA feature page, there are many improvements on ELF-analysis.
Although I didn't figure out what exactly a PIC mode elf is...

  igorsk     May 12, 2009 19:39.41 CDT
PIC = position-independent code.
http://www.iecc.com/linker/linker08.html

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