VMPROTECT | Obfuscation method using virtual machine | Emulator library

by eaglx C++ Version: v0.4 License: GPL-3.0

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | VMPROTECT Summary

VMPROTECT is a C++ library typically used in Utilities, Emulator applications. VMPROTECT has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

A virtual machine that simulates a CPU along with a few other hardware components, allows to perform arithmetic operations, reads and writes to memory and interacts with I/O devices. It can understand a machine language which can be used to program it. Virtual machines used in code obfuscation are completely different than common virtual machnines. They are very specific to the task of executing a few set of instructions. Each instruction is given a custom opcode (often generated at random).

Support

Quality

Security

License

Reuse

Support

VMPROTECT has a low active ecosystem.

It has 380 star(s) with 75 fork(s). There are 19 watchers for this library.

It had no major release in the last 12 months.

There are 0 open issues and 2 have been closed. On average issues are closed in 8 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of VMPROTECT is v0.4

Quality

VMPROTECT has 0 bugs and 0 code smells.

Security

VMPROTECT has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

VMPROTECT code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

VMPROTECT is licensed under the GPL-3.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

VMPROTECT releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

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VMPROTECT Key Features

No Key Features are available at this moment for VMPROTECT.

VMPROTECT Examples and Code Snippets

No Code Snippets are available at this moment for VMPROTECT.

Community Discussions

Trending Discussions on VMPROTECT

How to Self checksuming work?

GPDB:Out of memory at segment

QUESTION

How to Self checksuming work?

Asked 2018-Apr-25 at 20:35

My Question how to self checksuming work and detect own checksum in memory of file and check if executable modified terminate app? like commercial exe protector vmprotect pelock themida etc.. and how algorithm using and how to embed checksum in own file of executable and detect if modified? how to work? for example check md5 or crc32 self checksum of binary executable sorry my bad english ;) Thank you!

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ANSWER

Answered 2018-Apr-25 at 20:35

I think there is a problem with trying to put the checksum or hash directly into your executable. Such an approach would mean that the checksum/hash is going to be taken into account when determining the checksum/hash of your executable/binary. You can't encode the checksum/hash without affecting the resulting hash/checksum of the binary/executable.

Without knowing more details of your situation, you probably want to have the hash of the binary stored outside of the thing you are trying to compute the checksum/hash of (ex. externally on a server or in a file located relative to the executable, etc.). You compute this hash after you've built your program. Your program on launch could then locate itself on disk and compute the hash of itself and compare to the hash stored externally.

Sorry if this would be better as a comment, but I don't have the rep to comment.

Source https://stackoverflow.com/questions/50027194

QUESTION

GPDB:Out of memory at segment

Asked 2017-Nov-07 at 17:52

we re facing OOM error when trying to execute multiple SQL query session via scheduled job .

Detailed error:

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ANSWER

Answered 2017-Nov-07 at 17:52

Do we need to increase the vmprotect limit? if Yes, then by which amount should we increase it?

There is a nice calculator on setting gp_vmem_protect_limit on Greenplum.org. The setting depends on how much memory, swap, and segments per host you have.
http://greenplum.org/calc/

You can be getting OOM errors for several reasons.

Bad query
Bad table distribution (skew)
Bad settings (like gp_vmem_protect_limit)
Not enough resources (RAM)

How to handle concurrency at gpdb?

More RAM, less segments per host, and workload management to limit the number of concurrent queries running.

How much swap we need to add here when we are already running with 30 GB RAM. currently, we have added 15GB swap here? is that ok ?

Only 30GB of RAM? That is pretty small. You can add more swap but it will slow down the queries compared to real RAM. I wouldn't use much more than 8GB of swap.

I recommend using 256GB of RAM or more especially if you are worried about concurrency.

What is the query to identify host connection with Greenplum database

Source https://stackoverflow.com/questions/47151986

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install VMPROTECT

A bash script was created for easier setup of the development environment. At the beginning the script checks and installs the necessary software. Next, copy files and run some unit tests. The bash script is compatible with Debian-based distributions and Advanced Package Tool, which handle the installation and removal of software. Or simply clone the project to the desired directory and install required software.
Debugger - the source code of the debugger,
SharedCode - shared codes between debugger and VMCore,
VMCore - the source code of the virtual machine,
vm.inc - the file with definitions of opcodes,
Editor - the source code of the code editor (only MacOS and Linux),
VMPROTECT.py - start here (only MacOS and Linux) :smile:

Support

The VM will simulate a fictional cpu (32-bit). It has a custom instrucion set compared to x86-64. The VM has 51,200 memory locations, each of which stores a 8-bit value (it can store a total of 50kb). The VM has stack, which is a separate data structure. The stack has 256 memory locations, each of which stores a 32-bit value (it can store a total of 512b). Also, there is a data buffer which has 1024 memory locations, each of which stores a 1-bit value. This buffer will store user input. In addition, the VMCore has implemented memory management through memory frames. This allows the execution of programs larger than those specified by CODE_DATA_SIZE. The frames will be saved in files named .cached.x.frame where x is the frame number. Drivers are designed to expand the VMPROTECT's capabilities. A sysbus is a driver that allows access to a filesystem. Arguments to functions pass via the stack.

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