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Topic created on: March 19, 2007 10:25 CDT by cyphunk .

I tried to load dmesg and ls from a suse 9.2 system and IDA 4.9 cuts short (very short) the .rel.plt and the .dynsym segements (PLT and Symbol Table, respectively). Hence, none of the system functions are mapped. Anyone have a nice solution for this?

at the moment I am considering writing my own fixup plugin which will take a objdump -r output and properly rename the functions of the PLT. Better ideas?

cyphunk		March 26, 2007 05:03.55 CDT
here is a small ida python script that takes the output of obdjump -R and renames functions in the PLT to proper function names. When run it will ask for the location of the file containing the output of objdump -R. It uses c++filt from cygwin to then unmangle any mangled names. import re import tkFileDialog import subprocess from Tkinter import * from idaapi import * from idautils import * import sys import os nameappend = "_." cppfilt = "c:\\usr\\cygwin\\bin\\c++filt.exe" # # ASK USER FOR OBJDUMP OUTPUT: # # A bug in how IDA python deals with sys requires we set baseName: root = Tk(baseName="c:") root.withdraw() filename = tkFileDialog.askopenfilename(title="Import Objdump -R output file", filetypes=[("All files", "")]) if filename == "": exit try: fh = open(filename) print "Opening %s" % filename filelines = fh.read().splitlines() fh.close() except IOError,msg: print "error reading %s: %s" % (filename, msg) # # PARSE OBJDUMP INTO .got SEGMENT ADDRESS AND # SYMBOL NAME # print "Parsing dynamic relocation table" for line in filelines: match = re.search('^([\da-fA-FxX]+)\s+\S+\s+(\S+)$', line) if not match: continue gotaddr = int(match.group(1),16) # conv hex->dec name = match.group(2) # # DEAL WITH MANGLED NAMES # # Check if we can use as demangler and setup pipes now: p = os.popen(cppfilt+" -p "+name,'r') if p: name = p.read().strip() # retain full name: name = re.subn("[<>:,\s~`'?]", "_", name)[0] print name # # MAP .got ADDRESS TO .plt JUMP TABLE # AND THEN RENAME .plt JUMP TO name # for pltaddr in DataRefsTo(gotaddr): MakeNameEx(pltaddr, name, SN_AUTO) print ".got %08X ->.plt %08X: %s" % (gotaddr, pltaddr, name)

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