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This repository contains several capabilities, demonstrating the Meltdown malicious program. For technical files about the malicious program, consult with the paper:

  • Meltdown by Lipp, Schwarz, Gruss, Prescher, Haas, Mangard, Kocher, Genkin, Yarom, and Hamburg

The capabilities on this repository are built with libkdump, a library we developed for the paper. This library simplifies exploitation of the malicious program by robotically adapting to particular properties of the atmosphere.

Movies

This repository contains two videos demonstrating Meltdown

Demos

This repository contains 5 demos to demonstrate reasonably so a lot of exhaust cases. All demos are examined on Ubuntu Sixteen.04 with an Intel Core i7-6700K, but they hang to mute work on any Linux machine with any contemporary Intel CPU since 2010.

For supreme results, we recommend a expeditiously CPU that supports Intel TSX (e.g. any Intel Core i7-5xxx, i7-6xxx, or i7-7xxx).
Furthermore, every demo needs to be pinned to 1 CPU core, e.g. with taskset.

Demo #1: A first take a look at (take a look at)

This is the most frequent demo. It uses Meltdown to learn accessible addresses from the hang tackle topic, no longer breaking any isolation mechanisms.

If this demo does no longer work for you, the ideal demos likely might well well additionally no longer work both. The reasons are manifold, e.g., the CPU might well well additionally be too leisurely, no longer enhance out-of-present execution, the excessive-resolution timer will not be any longer proper enough (particularly in VMs), the operating machine does no longer enhance customized designate handlers, and so forth.

Invent and Scurry

Ought to you have confidence an output similar to this

Demand: Welcome to the shapely world of microarchitectural assaults
   Received: Welcome to the shapely world of microarchitectural assaults

then the elementary demo works.

Demo #2: Breaking KASLR (kaslr)

Initiating with Linux kernel four.12, KASLR (Kernel Handle Verbalize Layout Randomizaton) is energetic by default. This implies, that the region of the kernel (and additionally the issue bodily map which maps the total bodily memory) adjustments with every reboot.

This demo uses Meltdown to leak the (secret) randomization of the issue bodily map. This demo requires root privileges to bustle up the design. The paper describes a variant which does no longer require root privileges.

Invent and Scurry

fabricate
sudo taskset 0x1 ./kaslr

After a few seconds, you will hang to mute have confidence something similar to this

[+] Reveal bodily map offset: 0xffff880000000000

Demo #Three: Reliability take a look at (reliability)

This demo checks how genuine bodily memory might well well additionally be learn. For this demo, you both need the issue bodily map offset (e.g. from demo #2) otherwise possibilities are you’ll well well likely additionally hang to disable KASLR by specifying nokaslr for your kernel whisper line.

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Invent and Scurry

Invent and originate reliability. Ought to possibilities are you’ll well well likely additionally hang KASLR enabled, the first parameter is the offset of the issue bodily map. Otherwise, the program does no longer require a parameter.

fabricate
sudo taskset 0x1 ./reliability 0xffff880000000000

After a few seconds, you will hang to mute uncover an output similar to this:

[-] Success price: Ninety nine.93% (learn 1354 values)

Demo #four: Read bodily memory (physical_reader)

This demo reads memory from a fairly so a lot of job by straight studying bodily memory. For this demo, you both need the issue bodily map offset (e.g. from demo #2) otherwise possibilities are you’ll well well likely additionally hang to disable KASLR by specifying nokaslr for your kernel whisper line.

In foremost, this program can learn arbitrary bodily addresses. Nonetheless, because the bodily memory contains reasonably so a lot of non-human-readable files, we provide a take a look at instrument (secret), which puts a human-readable string into memory and straight provides the bodily tackle of this string.

Invent and Scurry

For the demo, first bustle secret (as root) to uncover the bodily tackle of a human-readable string:

It will mute output something esteem this:

[+] Secret: Ought to possibilities are you'll well well likely additionally learn this, this is after all horrid
[+] Physical tackle of secret: 0x390fff400
[+] Exit with Ctrl+C for parents that might well well additionally be accomplished studying the secret

Let the secret program operating, and originate physical_reader. The principle parameter is the bodily tackle printed by secret. Ought to you fabricate no longer hang KASLR disabled, the 2nd parameter is the offset of the issue bodily map.

taskset 0x1 ./physical_reader 0x390fff400 0xffff880000000000

After a few seconds, you will hang to mute uncover an output similar to this:

[+] Physical tackle       : 0x390fff400
[+] Physical offset        : 0xffff880000000000
[+] Reading virtual tackle: 0xffff880390fff400

Ought to possibilities are you'll well well likely additionally learn this, this is after all horrid

Demo #5: Dump the memory (memdump)

This demo dumps the say of the memory. As demo #Three and #four, it uses the issue bodily map, to dump the contents of the bodily memory in a hexdump-esteem layout.

Any other time, because the bodily memory contains reasonably so a lot of non-human-readable say, we provide a take a look at instrument to have confidence gorgeous amounts of the bodily memory with human-readable strings.

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Invent and Scurry

For the demo, first bustle memory_filler to have confidence the memory with human-readable strings. The principle argument is the amount of memory (in gigabytes) to have confidence.

Then, bustle the memdump instrument to dump memory contents. Ought to you accomplished memory_filler earlier than, you will hang to mute have confidence some string fragments.
Ought to possibilities are you’ll well well likely additionally hang Firefox or Chrome with multiple tabs operating, possibilities are you’ll well well likely additionally have confidence parts of the websites that are originate or were only within the near past closed.

The principle parameter is the bodily tackle at which the dump will hang to mute originate (leave empty to originate on the first gigabyte). Ought to you fabricate no longer hang KASLR disabled, the 2nd parameter is the offset of the issue bodily map.

taskset 0x1 ./memdump 0x240000000 0xffff880000000000 # originate at 9 GB

You’ll be capable to hang to mute uncover a hexdump of parts of the memory (doubtlessly even containing secrets and solutions similar to passwords, have confidence example within the paper), e.g.:

 240001c9f: | 00 6d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | .m.............. |
 24000262f: | 00 7d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | .}.............. |
 24000271f: | 00 00 00 00 00 00 00 00 00 00 00 00 65 6e 20 seventy five | ............en u |
 24000272f: | seventy three 65 seventy two 20 seventy three 70 Sixty one sixty three 65 20 Sixty one 6e Sixty four 20 6b 65 | ser topic and ke |
 24000273f: | seventy two 6e 65 6c 57 65 6c sixty three 6f 6d 65 20 seventy four 6f 20 seventy four | rnelWelcome to t |
 24000298f: | 00 Sixty one seventy two Seventy nine 20 sixty two 65 seventy four Seventy seven 65 65 6e 20 seventy five seventy three 65 | .ary between exhaust |
 24000299f: | seventy two 20 seventy three 70 Sixty one sixty three 65 20 Sixty one 6e Sixty four 20 6b 65 seventy two 6e | r topic and kern |
 2400029af: | 65 6c Forty two seventy five seventy two 6e 20 Sixty one 66 seventy four 65 seventy two 20 seventy two 65 Sixty one | elBurn after rea |
 2400029bf: | Sixty four Sixty nine 6e 67 20 seventy four sixty eight Sixty nine seventy three 20 seventy three seventy four seventy two Sixty nine 6e 67 | ding this string |
 240002dcf: | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c8 | ................ |
 2400038af: | 6a seventy five seventy three seventy four 20 seventy three 70 Sixty nine 65 Sixty four 20 6f 6e 20 Sixty one 00 | ethical spied on a. |
 240003c8f: | 00 00 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 | ................ |
 24000412f: | 00 00 00 00 00 00 00 00 00 00 00 00 65 seventy four seventy three 2e | ............ets. |
 24000413f: | 2e 2e 57 65 6c sixty three 6f 6d 65 20 seventy four 6f 20 seventy four sixty eight 65 | ..Welcome to the |
 2400042ff: | 00 00 00 00 00 00 00 00 00 6e 67 seventy two Sixty one seventy four seventy five 6c | .........ngratul |
 24000430f: | Sixty one seventy four Sixty nine 6f 6e seventy three 2c 20 Seventy nine 6f seventy five 20 6a seventy five seventy three seventy four | ations, you ethical |
 24000431f: | 20 seventy three 70 Sixty nine 65 Sixty four 20 6f 6e 20 Sixty one 6e 20 Sixty one 70 70 |  spied on an app |

Warnings

Warning #1: We are offering this code as-is. You are to blame for safeguarding yourself, your residence and files, and others from any dangers precipitated by this code. This code might well well additionally aim surprising and undesirable behavior to happen for your machine. This code might well well additionally no longer detect the vulnerability for your machine.

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Warning #2: Ought to you concept that a computer is inclined to the Meltdown malicious program, possibilities are you’ll well well likely have to hang away from the exhaust of it as a multi-consumer machine. Meltdown breaches the CPU’s memory safety. On a machine that is inclined to the Meltdown malicious program, one job can learn all pages ragged by other processes or by the kernel.

Warning #Three: This code is easiest for sorting out capabilities. Terminate no longer bustle it on any productive programs. Terminate no longer bustle it on any machine that might well well be ragged by yet every other individual or entity.

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