https://github.com/raphaelsc/Am-I-affected-by-Meltdown
Meltdown Exploit / Proof-of-concept / checks whether system is affected by Variant 3: rogue data cache load (CVE-2017-5754), a.k.a MELTDOWN.
https://github.com/raphaelsc/Am-I-affected-by-Meltdown
exploit intelbug kaiser kpti meltdown poc pti security
Last synced: 2 days ago
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Meltdown Exploit / Proof-of-concept / checks whether system is affected by Variant 3: rogue data cache load (CVE-2017-5754), a.k.a MELTDOWN.
- Host: GitHub
- URL: https://github.com/raphaelsc/Am-I-affected-by-Meltdown
- Owner: raphaelsc
- License: bsd-2-clause
- Created: 2018-01-04T23:51:12.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2018-02-27T05:22:38.000Z (about 7 years ago)
- Last Synced: 2025-04-05T17:06:02.846Z (18 days ago)
- Topics: exploit, intelbug, kaiser, kpti, meltdown, poc, pti, security
- Language: C++
- Homepage: https://meltdownattack.com/
- Size: 118 KB
- Stars: 541
- Watchers: 44
- Forks: 71
- Open Issues: 8
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
## Am I affected by Meltdown?! Meltdown (CVE-2017-5754) checker
#### What am I?
Proof-of-concept /
Exploit /
Checks whether system is affected by Variant 3: rogue data cache load (CVE-2017-5754), a.k.a MELTDOWN.
The basic idea is that user will know whether or not the running system is properly patched with
something like KAISER patchset (https://lkml.org/lkml/2017/10/31/884) for example.
Check out my blog post that guides reader through a Meltdown proof-of-concept: http://funwithbits.net/blog/programmers-guide-to-meltdown/
*** Only works on Linux for now ***
#### How it works?
It works by using */proc/kallsyms* to find system call table and checking whether the address of a
system call found by exploiting MELTDOWN match the respective one in */proc/kallsyms*.
#### Getting started
Clone, then run `make` to compile the project, then run `meltdown-checker`:
```
git clone https://github.com/raphaelsc/Am-I-affected-by-Meltdown.git
cd ./Am-I-affected-by-Meltdown
make
taskset 0x1 ./meltdown-checker
```
#### What to do when you face:
- `Unable to read /proc/kallsyms...`
That's because your system may be preventing the program from reading kernel symbols in `/proc/kallsyms` due to `/proc/sys/kernel/kptr_restrict` set to `1`.
The following command will do the tricky:
```
sudo sh -c "echo 0 > /proc/sys/kernel/kptr_restrict"
```
- `Unable to read /boot/System.map-.`
That could probably be because your system not having `/boot` mounted. This program relies on that partition and thus you'd need to mount your `/boot` partition first.
*Please open an issue if you have an idea on how to fallback to another approach in this scenario.*
#### Example output for a system affected by Meltdown:
```
Checking whether system is affected by Variant 3: rogue data cache load (CVE-2017-5754), a.k.a MELTDOWN ...
Checking syscall table (sys_call_table) found at address 0xffffffffaea001c0 ...
0xc4c4c4c4c4c4c4c4 -> That's unknown
0xffffffffae251e10 -> That's SyS_write
System affected! Please consider upgrading your kernel to one that is patched with KAISER
Check https://security.googleblog.com/2018/01/todays-cpu-vulnerability-what-you-need.html for more details
```