Added license & readme files.

pull/1/head
Andrei Vlad LUTAS 4 years ago
commit 6ce54a28d6

@ -0,0 +1,201 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright 2020 Bitdefender
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

@ -0,0 +1,145 @@
# The Bitdefender disassembler
The Bitdefender disassembler is a lightweight, x86/x64 only instruction decoder. It is easy to integrate, easy to work with, it has no external dependencies, it is thread-safe, it allocates no memory at all, it works in virtually any environment (we use it inside user, kernel, hypervisor, on both Windows and Linux environments), and it provides lots of info regarding the decoded instructions, such as: operands (both explicit and implicit), access mode for each operand, CPUID feature flag, flags access, etc.
## Projects
1. disasm - this is the main disassembler project. In order to use the Bitdefender disassembler, all you have to do is build this project, and link with the output library. The only headers you need are located inside the inc folder.
2. shemu - this project makes use of the main disasm lib in order to build a simple, lightweight, fast, instructions emulator, designated to target shellcodes. This project is also integrated inside the disasmtool, so you can
emulate raw binary files, and see their output. Note that this simple emulator supports basic x86/x64 instructions, and does not support emulating any kind of API call.
3. isagenerator - this project contains the instruction definitions and the scripts required to generate the disassembly tables. If you wish to add support for a new instruction, this is the place. This project will automatically generate several header files (instructions.h, mnemonics.h, constants.h, table_\*.h), so please make sure you don't manually edit any of these files.
4. disasmtool - this project is a command line disassembler tool, used mainly as an example of how to integrate the disasm lib.
5. disasmtool_lix - like disasmtool, but for Linux.
6. pydis - this is the Python binding for the disasm project.
## Objectives
The main objectives of this disassembler are:
1. Lighetweight - it's written in C, with no external dependencies, no memory allocated, and thread safe by design.
2. Fast - less than 300 CPU clocks on a Intel Core i7-8650U per decoded instruction.
3. Resilient - tested against internal fuzzers and the famous [mishegos](https://github.com/trailofbits/mishegos) tool
4. Easy to work with - just include the main header file, disasm.h, link with the disasmlib library, and call the NdDecode API!
5. Complete - support every x86 instruction to date, and provide as much information as possible.
## Build
### Windows
In order to build the projects on Windows you need:
* [Visual Studio 2019](https://visualstudio.microsoft.com/vs/) with the Desktop development with C++ workload.
* [Windows SDK 10.0.18362.0](https://developer.microsoft.com/en-us/windows/downloads/windows-10-sdk/).
When you first open the solution Visual Studio should prompt you to install any missing components.
This should be enough to build disasm, disasmtool and shemu for the Debug and Release configurations.
For the DebugKernel and ReleaseKernel configurations, [WDK 1903](https://go.microsoft.com/fwlink/?linkid=2085767) is needed, alongside the Windows Driver Kit Visual Studio extension (the WDK installer should take care of this).
For isagenerator, python is needed.
Building any of the projects is done directly from Visual Studio.
The results will be in the bin directory in the root of the repository.
### Linux
In order to build the projects on Linux you need:
* gcc
* make
For disasmtool_lix you also need:
* g++
* cmake 3.12 or newer
* [RapidJSON](https://github.com/Tencent/rapidjson/)
In order to build disasm and shemu run `make` in the root of the repository. The results will be placed in the bin directory.
In order to build disasmtool_lix go to the disasmtool_lix directory and run `make`. The results will be in the bin directory in the disasmtool_lix/build directory.
## Example
Working with disasm is very easy. Decoding and printing the disassembly of an instruction is quick & simple:
```c
#include "disasm.h"
int main()
{
INSTRUX ix;
uint8_t code[] = { 0x48, 0x8B, 0x48, 0x28 };
NDSTATUS status = NdDecodeEx(&ix, code, sizeof(code), ND_CODE_64, ND_DATA_64);
// Check if decoding failed.
if (!ND_SUCCESS(status))
{
printf("Decode failed with error %x!\n", status);
return -1;
}
// Checking if the instruction is a MOV.
if (ix.Instruction == ND_INS_MOV)
{
printf("The instruction is mov!\n");
}
// Checking if memory is read by the instruction.
if (!!(ix.MemoryAccess & ND_ACCESS_ANY_READ))
{
printf("The instruction reads memory!\n");
}
// Checking if the destination is the RCX register.
if (ND_IS_OP_REG(&ix.Operands[0], ND_REG_GPR, 8, REG_RCX))
{
printf("The first op is RCX!\n");
}
// Checking if the source is memory.
if (ix.Operands[1].Type == ND_OP_MEM)
{
printf("Source is memory!\n");
if (ix.Operands[1].Info.Memory.HasSeg)
{
printf(" Segment reg: %d\n", ix.Operands[1].Info.Memory.Seg);
}
if (ix.Operands[1].Info.Memory.HasBase)
{
printf(" Base reg: %d\n", ix.Operands[1].Info.Memory.Base);
}
if (ix.Operands[1].Info.Memory.HasIndex)
{
printf(" Index reg: %d, scale: %d\n", ix.Operands[1].Info.Memory.Index, ix.Operands[1].Info.Memory.Scale);
}
if (ix.Operands[1].Info.Memory.HasDisp)
{
printf(" Displacement: 0x%llx\n", ix.Operands[1].Info.Memory.Disp);
}
}
// Create the text disassembly for this instruction.
char text[ND_MIN_BUF_SIZE];
NdToText(&ix, 0, sizeof(text), text);
printf("Instruction: %s\n", text);
return 0;
}
```
## Credits
The entire Bitdefender HVI team.
Loading…
Cancel
Save