Questions tagged [hexrays]
A decompiler plugin for IDA, producing (pseudo-)C/C++ code, developed by the company of the same name (Hex-Rays).
105
questions
41
votes
1answer
88k views
Decompiling iPhone App
I've been searching this site and more, but I haven't had much luck. I want to decompile an app to see how part of it works, and I've tried multiple programs. I've tried Hopper, IDA, and some other ...
17
votes
1answer
10k views
How to organize vtables in IDA Pro?
I am using IDA Pro to disassemble a C++ behemoth with 1600+ classes, many of them having pure virtual methods.
Some classes also are made up of multiple base classes, in hierarchies 5+ levels deep.
...
10
votes
1answer
772 views
Hex-Rays Decompiler: Buffer on the stack
I am currently reversing a windows driver in order to write a Linux compatible driver for a DVB card, but I have come up against a small issue that I can work around, but if it is possible I would ...
9
votes
1answer
965 views
Information provided by Hex-Rays after @ symbol in variable declarations
Could you explain to me the information provided after the @ symbol in Hex-Rays decompilation ? For examples @1 and @5 in the following output:
struct WSAData wsadata; // [sp+0h] [bp-1A0h]@1
int v6; /...
7
votes
2answers
949 views
Split variable in Hexrays decompiler?
With Microsoft Visual C++ executables, I often run into decompilations like this:
void __cdecl Pbdf::ReadString(char *dst, Pbdf *pbdfOrLength)
{
Pbdf *pbdf; // esi
pbdf = pbdfOrLength;
...
7
votes
1answer
851 views
How to map a variable to multiple names in Hex-Rays decompiler
Compilers often optimize variables usage, so multiple variables in the source code can be mapped to the same register (or stack variable) in the resulting assembly.
I know that registers can be ...
6
votes
3answers
7k views
Hex-Rays: JUMPOUT statements inserted due to incorrect autodetected function boundaries
I'm trying to RE a Windows executable compiled with VS 2008. After the initial autoanalysis most functions are detected correctly; however, some have wrong end address — for some reason IDA places the ...
5
votes
1answer
2k views
IdaPro/HexRays type libraries
I'm trying to improve my use of ida/hexrays... I have a x86 linux elf binary, non-stripped, statically linked w/ openssl. So you can see all of the OpenSSL function names in the binary.
I used the ...
5
votes
1answer
2k views
IDA PRO Hex-Rays 1.5 pseudo code understanding -=0x3FFFFFFFu; += 0x3FFFFFFFu;
I'm trying to clean up the pseudo code to make it compile and function similar if not exactly the same as the original code.
This bit which looks like this appears in various places I'm trying to ...
5
votes
2answers
1k views
How to get IDA Pro to understand a virtual function table?
I'm reversing an old DirectDraw game that uses DirectX 7.
I have a LPDIRECTDRAWSURFACE7 g_lpDDSBack and g_lpDDSBack->BltFast is being called but this is how it is decompiled in HexRays:
(*(int (...
5
votes
3answers
3k views
IDApython and IDA-decompiler commenting
Looking at the functions exposed by idaapi I see that functions like the following are exposed.
get_user_cmt
set_user_cmt
save_user_cmts
As these functions are exposed I'm hoping that I have a way ...
5
votes
0answers
583 views
How to create HexRays variables in IDAPython correctly?
Let's assume we have a function which has a following variables in it:
Local variables on stack of different types, including types defined in local types window
Local variables of different types ...
4
votes
2answers
1k views
HexRays: Variadic methods like printf
I have identified a routine that behaves exactly like printf in an ARM64 binary. Arguments are passed in the standard fashion (e.g. X0, X1, X2 ...) and I have given the function the signature (Y) of:
...
4
votes
1answer
727 views
Resolving FLAGS bits with IDA
While disassembling a binary, IDA decompiler decompiles the call as mmap(0x80000000, 4096, 7, 50, -1, 0); While there is nothing wrong with the decompilation itself, it could be more useful to decode ...
4
votes
1answer
796 views
How to find matching braces in IDA's decompiled code?
For the source generated by Hex Ray's decompiler in IDA, is it possible to highlight matching braces once I place the pointer at the beginning of a block?
As an example, in the screenshot below, the ...
4
votes
1answer
1k views
Condense pseudocode lines in IDA Pro
In IDA 6.6, is it possible to condense, or otherwise re-arrange, lines of pseudocode given by the Hex-Rays decompiler? For example
if ( !iFile2Size
|| *pFile2BufferCopy == *pFile3BufferCopy
&&...
3
votes
2answers
391 views
Cleaning HexRays Output
My HexRays decompiler output often looks like:
v0 = LoadLibraryW(L"wininet.dll");
v1 = v0;
if ( !v0 )
goto LABEL_1;
v2 = GetProcAddress(v0, "InternetOpenW");
v3 = GetProcAddress(v1, "...
3
votes
2answers
4k views
Reverse Engineering MIPS Bootloader
I am trying to figure out how the bootloader of a TP-Link wr702n device (based on an AP121 MIPS board) starts the operation system (VxWorks 5.5.1). The bootloader is extracted from a firmware update ...
3
votes
1answer
3k views
Doesn't IDA Pro 6.95 support decompiling MIPS executable?
I am working on a MIPS binary: ELF 32-bit MSB executable, MIPS, MIPS-II version 1 (SYSV), statically linked, for GNU/Linux 2.6.32, BuildID[sha1]=76438e9ed749bcfc6e191e548da153d0d3b3ee28, not stripped
....
3
votes
3answers
3k views
Reversing an MFC application: How to find class memory layouts?
I have an old computer game I want to reverse (Windows 95 "Hover!" to be exact), and I figured out that it uses the MFC.
HexRays often decompiles pseudocode like this, which, for example, deals with ...
3
votes
1answer
8k views
IDA Pro/Hex-Rays FLIRT Signatures and Standard library function detection
I'm having some problems performing a standard decompilation of a Windows EXE file using IDA Pro/Hex-Rays and its built-in FLIRT signatures.
A lot of standard C++ functions are not being recognized ...
3
votes
1answer
470 views
Does hex-rays support VLA in any way?
I was testing some 'C' code with VLAs. It wasn't that surprising that Hex-Rays was not able to recognize VLA. As with structures there is some way to make it understand (simply making the variable ...
3
votes
0answers
292 views
IDA Hex-Rays structure inline functions recognition
I've seen multiple posts about the subject, but mine is a little bit more specific about what I want to achieve.
I have many times situations where Hex-Rays decompiler outputs 16 lines of code and I ...
3
votes
0answers
932 views
STL map and map entry structures for IDA/HexRays
I have several binaries (Visual Studio 2005, amd64/x86_64) that I need a portion of each reversed in order to better understand the reasons for their malfunction in certain edge cases (they are long ...
2
votes
2answers
3k views
How do I evaluate Hex-Rays Decompiler without purchasing IDA Disassembler?
Hex-Rays, providers of IDA Disassembler, offers a companion product called Hex-Rays Decompiler (not to be confused with HexRaysCodeXplorer, a plugin for the Decompiler plugin rather than for IDA ...
2
votes
2answers
4k views
IDA Hex-Rays Decompiler : Show strings instead of offset
How can i settings IDA show me string instead of offset_xxx?
2
votes
3answers
2k views
IDA decompiler macro
What is the purpose of COERCE_FLOAT and COERCE_UNSIGNED_INT macros in the Hex Rays decompiled code below?
double __cdecl sub_401580(float a1)
{
unsigned int v1; // eax@1
double v2; // st7@1
...
2
votes
4answers
4k views
How to decompile with Hex Rays via a Python API?
If i have a large set of files and I'd like to run Hex-rays over them to produce output as C - can I do so in python?
I see there is IDA Python
And I see Hex-rays has a C++ SDK
Is there a python Hex-...
2
votes
2answers
125 views
How to show KUSER_SHARED_DATA members in decompiled C code?
Here is a sample C code which prints Windows version directly from address
of KUSER_SHARED_DATA. Tested in Windows 10 only. The raw memory address
differ in Windows version but that's not the point.
#...
2
votes
2answers
822 views
How to help IDA to auto complete libc functions?
I have a x86_64 ELF binary which is statically compiled. With some digging,
I have found the C library is musl. In IDA Pro 7.0, the decompiled pseudo code
shows sycalls as inline assembly code. But in ...
2
votes
2answers
6k views
What is *(_BYTE *), __usercall, eax and edi [closed]
I am trying to understand some algorithm of how the thing works. Here is the function I got from decompiling my executable with Hey Rays.
I want to run this function to see the result and then ...
2
votes
1answer
5k views
What does __PAIR__ mean in Hex-Rays decompiler output? [duplicate]
what does this code on IDA? i've found with this a couple of times and i don't have idea what means.
int a5;
int dGainMax;
COERCE_DOUBLE(__PAIR__(a5, dGainMax))
2
votes
1answer
2k views
Hex-Rays and IDA Python plugin loading order
I have made a plugin (using IDA Python) that requires the Hex-Rays plugin.
As per the instructions in the hexrays_sdk folder, I've named my plugin starting with hexrays_ to make sure it loads after ...
2
votes
2answers
2k views
IDA Pro: Where does newly created structure go to from Pseudocode window?
Where does newly created structure go to from Pseudocode window? I'm referring to structure that you create via right-click on variable and choosing "Create new struct type".
I don't see new ...
2
votes
1answer
154 views
IDA pseudocode support
How can I know which processors IDA knows how to view pseudocode of?
If IDA does not know to view pseudocode for my processor, how can I fix that??
2
votes
1answer
100 views
How to migrate IDA/HexRays database to the new version of the same application?
I have an .idb and PE file of an old version of an application. Now I want to transfer all knowledge to a new database for the new version of PE. How can I do this?
It seems that I need to compare ...
2
votes
1answer
188 views
Weird IDA/Decompiler floating point output
I stumbled upon this (reduced for readability) function. It does weird things that I have never encountered before.
// a2 is always 60.0
void some_function(struct_123 *this, float a1, float a2)
{
...
2
votes
1answer
930 views
How do I resolve IDA pro Hexrays aliased local variables?
It appears to me that in my function the compiler has reused a stack slot for two variables of types. However, Hex-Rays has not recognized it as such. How can I split the local variable into two?
2
votes
1answer
340 views
Hex-Rays function signature does not match demangled name
From the demangled name, I know that a function takes an std::string const& as a parameter but when generating psuedo-c code with Hex-Rays' decompiler it autodetects the parameters as (int a1, int ...
2
votes
1answer
575 views
Compile Hex-Rays code
I'm aware, that Hex-Rays provides pseudocode, which is not supposed to be compiled, but I'm trying to do it.
So far I stopped on instructions like that:
char (__usercall *__fastcall sub_947770(...
2
votes
1answer
43 views
Reversing assembler DCD directive list into a c++ variable
For example we have assembler variable "foo" defined as:
.text:00001078 foo DCD 0xffffffff, 0xffffeeee
How it(variable foo) would look like in c++(or whatever higher lang)???
2
votes
0answers
186 views
IDA Hex-Rays Decompiler Generates ASM Code Issue
For a long time now, I've been struggling with some functions generated with IDA HexRays plugin that seem to be corrupted.
Some of the decompiled generated plain C code, show as ASM code :/
i.e:
...
2
votes
2answers
423 views
Nested Structures in IDA
I'm trying to figure out how to explore structs in IDA, and getting stuck on the basics. I wrote a very basic test app;
int main() {
const int kBits = 1024;
const int kExp = 3;
RSA *rsa =...
2
votes
0answers
2k views
IDA Pro PowerPC Decompiler Plugin supporting Floating Point Instructions
So I far I have been using Snowman for PowerPC decompilation. It is bad though but better than nothing. However, right now it doesn't support floating point instructions. They are simply written down ...
1
vote
2answers
996 views
IDA Hex-Rays: How to SAFELY fix incorrect function declarations?
Update:
The problem turned out to be more complex and complex because Hex-Rays incorrectly restores the stack after calls of stdcall functions from cdecl functions:
.text:00403F2F 074 ...
1
vote
1answer
1k views
Wrapping usercall from Hex-Rays
I am trying to call a function generated by Hex-Rays by injecting a DLL, but have so far only managed to crash the process.
This is the code generated by Hex-Rays
int __usercall sub_54C3A0@<eax&...
1
vote
2answers
149 views
STL Data Structures Hex-Rays
We all know that reversing STL code is no fun. To make it easier, I usually create some of the strucutres so I can reference the created STL structures in another custom structure.
For example, msvc - ...
1
vote
2answers
468 views
Batch decompile using IDA Pro 7.5
I am trying to batch disassemble and decompile 500 binaries using the IDA Pro 7.5 disassember and Hex rays decompiler. I can get the .i64 output from the disassembler, but I do not have a way to batch ...
1
vote
2answers
2k views
Saving .so file in IDA
I have edited .so file in IDA. I don't know how to save it. Any idea for saving them?
1
vote
1answer
2k views
How to edit (insert new fields into) IDA structures?
I'm trying to reverse a bigger structure used in an old game. Obviously I didn't know all fields when I created the structure type, and now I want to edit in some new fields / change pure byte gaps ...
