How to convert PE(Portable Executable) format to ELF in linux
What's the best tool for converting PE binaries to ELF binaries?
Following is a brief motivation for this question:
- Suppose I have a simple C program.
- I compiled it using gcc for linux(this gives ELF), and using 'i586-mingw32msvc-gcc' for Windows(this gives a PE binary).
- I want to analyze these two binaries for similarities, using Bitblaze's static analysis tool - vine(http://bitblaze.cs.berkeley.edu/vine.html)
- Now vine doesn't have a good support for开发者_运维知识库 PE binaries, so I wanted to convert PE->ELF, and then carry on with my comparison/analysis.
Since all the analysis has to run on Linux, I would prefer a utility/tool that runs on Linux.
Thanks
It is possible to rebuild an EXE as an ELF binary, but the resulting binary will segfault very soon after loading, due to the missing operating system.
Here's one method of doing it.
Summary
- Dump the section headers of the EXE file.
- Extract the raw section data from the EXE.
- Encapsulate the raw section data in GNU linker script snippets.
- Write a linker script to build an ELF binary, including those scripts from the previous step.
- Run
ld
with the linker script to produce the ELF file. - Run the new program, and watch it segfault as it's not running on Windows (and it tries to call functions in the Import Address Table, which doesn't exist).
Detailed Example
Dump the section headers of the EXE file. I'm using
objdump
from themingw
cross compiler package to do this.$ i686-pc-mingw32-objdump -h trek.exe trek.exe: file format pei-i386 Sections: Idx Name Size VMA LMA File off Algn 0 AUTO 00172600 00401000 00401000 00000400 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 1 .idata 00001400 00574000 00574000 00172a00 2**2 CONTENTS, ALLOC, LOAD, DATA 2 DGROUP 0002b600 00576000 00576000 00173e00 2**2 CONTENTS, ALLOC, LOAD, DATA 3 .bss 000e7800 005a2000 005a2000 00000000 2**2 ALLOC 4 .reloc 00013000 0068a000 0068a000 0019f400 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 5 .rsrc 00000a00 0069d000 0069d000 001b2400 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA
Use
dd
(or a hex editor) to extract the raw section data from the EXE. Here, I'm just going to copy the code and data sections (named AUTO and DGROUP in this example). You may want to copy additional sections though.$ dd bs=512 skip=2 count=2963 if=trek.exe of=code.bin $ dd bs=512 skip=2975 count=347 if=trek.exe of=data.bin
Note, I've converted the file offsets and section sizes from hex to decimal to use as
skip
andcount
, but I'm using a block size of 512 bytes indd
to speed up the process (example: 0x0400 = 1024 bytes = 2 blocks @ 512 bytes).Encapsulate the raw section data in GNU ld linker scripts snippets (using the BYTE directive). This will be used to populate the sections.
cat code.bin | hexdump -v -e '"BYTE(0x" 1/1 "%02X" ")\n"' >code.ld cat data.bin | hexdump -v -e '"BYTE(0x" 1/1 "%02X" ")\n"' >data.ld
Write a linker script to build an ELF binary, including those scripts from the previous step. Note I've also set aside space for the uninitialized data (.bss) section.
start = 0x516DE8; ENTRY(start) OUTPUT_FORMAT("elf32-i386") SECTIONS { .text 0x401000 : { INCLUDE "code.ld"; } .data 0x576000 : { INCLUDE "data.ld"; } .bss 0x5A2000 : { . = . + 0x0E7800; } }
Run the linker script with GNU
ld
to produce the ELF file. Note I have to use an emulation modeelf_i386
since I'm using 64-bit Linux, otherwise a 64-bit ELF would be produced.$ ld -o elf_trek -m elf_i386 elf_trek.ld ld: warning: elf_trek.ld contains output sections; did you forget -T? $ file elf_trek elf_trek: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, not stripped
Run the new program, and watch it segfault as it's not running on Windows.
$ gdb elf_trek (gdb) run Starting program: /home/quasar/src/games/botf/elf_trek Program received signal SIGSEGV, Segmentation fault. 0x0051d8e6 in ?? () (gdb) bt \#0 0x0051d8e6 in ?? () \#1 0x00000000 in ?? () (gdb) x/i $eip => 0x51d8e6: sub (%edx),%eax (gdb) quit
IDA Pro output for that location:
0051D8DB ; size_t stackavail(void) 0051D8DB proc stackavail near 0051D8DB push edx 0051D8DC call [ds:off_5A0588] 0051D8E2 mov edx, eax 0051D8E4 mov eax, esp 0051D8E6 sub eax, [edx] 0051D8E8 pop edx 0051D8E9 retn 0051D8E9 endp stackavail
For porting binaries to Linux, this is kind of pointless, given the Wine project. For situations like the OP's, it may be appropriate.
I've found a simpler way to do this. Use the strip command.
Example
strip -O elf32-i386 -o myprogram.elf myprogram.exe
The -O elf32-i386
has it write out the file in that format.
To see supported formats run
strip --info
I am using the strip command from mxe, which on my system is actually named /opt/mxe/usr/bin/i686-w64-mingw32.static-strip
.
I don't know whether this totally fits your needs, but is it an option for you to cross-compile with your MinGW version of gcc?
I mean do say: does it suit your needs to have i586-mingw32msvc-gcc compile direct to ELF format binaries (instead of the PEs you're currently getting). A description of how to do things in the other direction can be found here - I imagine it will be a little hacky but entirely possible to make this work for you in the other direction (I must admit I haven't tried it).
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