Questions tagged [hexrays]
A decompiler plugin for IDA, producing (pseudo-)C/C++ code, developed by the company of the same name (Hex-Rays).
93
questions
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6 views
Hex Rays Mapping To Wrong Variable
The assembly file has multiple variables which both use the rax register. The decompiler did recognize that at least somewhat, since it did create two variables which use the rax register. However, it ...
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0answers
37 views
IDA/Hexrays: local variable allocation has failed; how to fix this?
I'm reverse engineering an old DOS game that's using the DOS/4GW extender. The game includes some libraries that I already successfully reversed in a different application, so I'm pretty sure that the ...
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1answer
64 views
Re-analyzing pseudocode IDA Pro
While I was reversing a binary I noticed that IDA Pro had adjusted the pseudocode that initially was generated. This happened after I started reversing the binary and renamed functions and variables ...
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0answers
167 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 ...
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0answers
54 views
Hex-Ray Decompiler: inline function not recognized
While trying to decompile an application with Hex-Ray 7.0, I stumbled upon the problem that in nearly all cases, what seems to be a certain inline function will not be recognised, which bloats the ...
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2answers
171 views
Methods for preventing IDA decompiler
I want to write a C function, such that hex-rays decompiler will fail on it. I want to do it for study purposes, and not for an actual anti-reversing method. Do you have any recommendations/approaches ...
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1answer
71 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??
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2answers
103 views
Hex-Rays skips code
have using IDA Pro 6.8 (Hex-Rays 2.2), default settings.
Problem starts happens when i trying to analyze function (which actual size ~2886 bytes), pressing F5 (without errors or alerts) and getting ...
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2answers
313 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 ...
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1answer
93 views
Is there a way to show exceptions handlers in Hex-Rays decompiler output?
Is there a way to show these exception handlers in the decompiled code?
I can't tell that a block is in a __try block without looking into the disassembly.
__int64 __fastcall ...
2
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1answer
65 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 ...
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38 views
How Can I Clean Up After IDA Decompation with IDAPython or other resource
When I am working on a source code recovery project I am usually left with a lot of code that needs to be manually cleaned up by hand. This can take a lot of time and as projects get larger , I am ...
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1answer
110 views
Understanding (pseudo-)C function from a video game [closed]
I recently found a function using IDA within a game that creates a CRC from a string. I don't understand much of the code or how the game takes in the string as data.
__int64 __fastcall ITF::...
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1answer
576 views
Decompile large function in IDA
I'm working on a crack me, specifically: jaunsacco's DragonCrack and the first thing I've gotten stuck on is that the program is built mostly as a enormous main function. After attempting to decompile ...
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1answer
151 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)
{
...
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0answers
98 views
IDA Pro Reset All Stack Pointers to Default
Is there a way letting IDA scan all the database and reset all stack pointers values to it's default state that were previously modified? i.e like it was when I first started the analyzing the binary?
...
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0answers
154 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:
...
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1answer
455 views
How can I follow virtual function calls in IDA?
I'm trying to reverse a video game that was made with the CryEngine 5 game engine. CryEngine 5 source code is available on GitHub, so I can look at the CryEngine source code and cross reference with ...
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1answer
89 views
Why Ida pseudo-code translate test as AND?
In IDA when disassembling a x86 EXE file there is a line
test byte ptr [ebp+XXX], cl
Before this line cl has a value of 0x11
The Hex-Rays decompiler plugin translates it as if (v10 &0x11).
Why ...
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2answers
487 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 ...
0
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1answer
538 views
IDA Hex-Rays: How to find all references to the certain field of all instances of the data type?
This question has already been asked here but for some reason it was deleted, as "dead".
I will try to explain again. I have a specific data type. It is used in a large number of disassembled ...
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2answers
290 views
Understanding Hex-Rays pseudo code
What is the meaning of the following pseudo-code?:
BYTE1(v2) or BYTE1(v2)
HIBYTE(v2)
Is there any explanation for those macros? How can I implement those macros in C code?
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2answers
311 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 =...
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0answers
150 views
How to remove all goto statements in pseudocode?
IDA shows multiple goto statements in the decompiled pseudocode. I've read this manual page: https://www.hex-rays.com/products/decompiler/manual/config.shtml and tried to disable/enable these flags ...
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0answers
241 views
IDA 7 handling strings in debugger pseudocode
When running a remote debugger to a linux server, is there a way to get IDA (7.0) to properly handle strings? When I go to the pseudocode view, I get things like this;
v7 = sub_804AD60((std::string *)...
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2answers
650 views
.NET assembly IDA PRO, using LDSTR IL op code, how to patch a string?
I'm trying to patch a string. So right now I'm trying to replace instruction LDSTR with LDSTR "mystring"; however, I have been unsuccessful. After assembling the LDSTR op code, I don't quite ...
4
votes
1answer
563 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 ...
0
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1answer
257 views
Translating ida macros and pseudocode into C++/C
What would be the translated C output of this hexrays decompiler pseudocode? The values of v6 and v5 are floats just as v8. The value of xmmword_108365D0 is 7FFFFFFF7FFFFFFF7FFFFFFF7FFFFFFFh
v8 = (...
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2answers
2k views
How to add/find parameters to a function declaration in IDA/HexRays?
I've a binary opened in IDA. It uses a function pointer from a COM vtable. I found that the COM method has 13 parameters (including this). But IDA shows only 4 parameters as shown in this pseudocode:
...
2
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2answers
3k views
IDA Hex-Rays Decompiler : Show strings instead of offset
How can i settings IDA show me string instead of offset_xxx?
2
votes
1answer
584 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?
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2answers
170 views
Some question about IDA [closed]
This binary was from a CTF challenge.
I found 2 way to solve this, one is run & debug the bin, set a break point and see result in flag after the bin running, another is trying to understand the ...
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2answers
717 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;
...
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vote
1answer
259 views
Odd convention for accessing elements of an array?
While reverse engineering a game using the Hex Rays decompiler I was looking for how an array of NPC's was accessed. I found the array but I don't quite understand the unusual formula for getting the ...
2
votes
1answer
322 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 ...
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votes
1answer
425 views
(Hex-Rays) How to define C macro?
Im want create reverse macro for constant integers, how i can do it?
Example:
#define MU_ITEM(x, y) (x * 512 + y)
My goal is make result of number format like: before & after.
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0answers
178 views
IDA Pro 7.0 showing incorrect LOCALS in pseudocode view
Whenever I debug something and I switch to pseudocode and then rename some of the "variables" that IDA Pro creates, the values shown in the LOCALS window don't match what the actual values of those ...
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2answers
310 views
IDA Hex-Rays suggests an invalid offset
While running Hex-Rays decompiler against an application, Hex-Rays gave the following output:
__int64 v29; // r10 ... v29 = 0i64; if( !v28) v19 = 0;
do
{
v30 = *(_BYTE *)(v29 + ...
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2answers
910 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:
...
2
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4answers
3k 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-...
3
votes
0answers
707 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 ...
0
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2answers
77 views
Tracing the last written value of a memory location without slowdown
I'm trying to debug the corruption of a linked list structure inside of a Win32 DLL with IDA Pro and Hexrays. The offending assembly traverses a doubly-linked list forwards checking a condition, and ...
2
votes
0answers
1k 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 ...
0
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1answer
173 views
Why does IDA identify so many non-existent methods in this binary?
The decompilation and auto-analysis of this binary is grossly inaccurate. I am providing the binary as well as the IDB. IDA v6.95, 32 bit was used for the analysis. Can anyone take a look and suggest ...
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1answer
2k 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
....
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0answers
275 views
Is there a from…import * equivalent of idaapi.require()?
Loading your own modules from your IDAPython scripts with idaapi.require() suggests using idaapi.require() to load user modules in IDAPython scripts. However in my script, I have extensively used from ...
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1answer
235 views
Is it possible to redirect IDAPython stack trace to console?
I am facing a weird problem! When my IDAPython script crashes, it produces a stack trace in the IDA default warning box that pops up right in front. The size of the box is neither adequate enough to ...
0
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1answer
500 views
Is there any IDA plugin to display AST?
Hex Ray has introduced a decompiler API as part of IDA v6.6. Is there any plugin which displays the detail Abstract Syntax Tree (AST) produced by the decompiler graphically?
I want something like ...
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1answer
343 views
How can I walk up along the AST using IDAPython decompiler API?
I am using IDAPython for my analysis. In IDA v6.95, the header file plugins/hexrays_sdk/include/hexrays.hpp defines the following:
typedef ctree_items_t parents_t;
parents_t parents; ///< ...
0
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1answer
221 views
How can I see the IDAPython implementation of HexRay's decompiler API?
I am trying to use HexRay's decompiler API, however having trouble due to its lack of documentation. Is there any means so That I can get to see the Python implementation of decompiler API?
