[FEATURE] Changing serial numbers on every patched QEMU installation

[Samuil1337]

Hi there,

First I want to thank you for creating this repository, because this helps setting up gaming VMs a ton. Now, to get back to my issue, the serial numbers and IDs in your patch are set statically, meaning that if some goofball uses this project to cheat, all the other users will get "hardware banned" as well. A script that creates these fields on every install would fix this, but I am already working on a port of the patch on QEMU 7.2, so I don't have the time to add this feature.

Best regards, Samuil

[zhaodice]

ok, I will add a script to generate random id to alter patch file

[zxcvqwerasdf]

Can you describe id's/serials and where i can find them?

[zxcvqwerasdf]

Any updates?

[zhaodice]

Any updates?

actually, you can edit any string "xxxx" from patch file

[Samuil1337]

Alright, so I tried find and replace on "XXXX" in the patch file, but it couldn't find any occurrences of that string. Could you please specify which strings exactly I should be looking out for?

[zhaodice]

Alright, so I tried find and replace on "XXXX" in the patch file, but it couldn't find any occurrences of that string. Could you please specify which strings exactly I should be looking out for?

it just example : [STR_SERIALNUMBER] = "144514"

[Scrut1ny]

Done. Enjoy.

#!/bin/bash

DIRECTORY="$HOME/Downloads/qemu/hw/usb"

find "$DIRECTORY" -type f -exec grep -l '\[STR_SERIALNUMBER\]' {} + | while IFS= read -r file; do
    NEW_SERIAL=$(tr -dc 'A-Z0-9' </dev/urandom | head -c 10)
    sed -i "s/\(\[STR_SERIALNUMBER\] *= *\"\)[^\"]*/\1$NEW_SERIAL/" "$file"
    echo -e "\e[32m + Modified:\e[0m '$file' with new serial: \e[32m$NEW_SERIAL\e[0m"
done

Run this command to verify results:

grep -Rn '\[STR_SERIALNUMBER\]'

[Scrut1ny]

@zhaodice Hey, what modification did you apply in the patch file to bypass Characteristics Bit4 of DMI SMBIOS [BIOS Information] (Type 0) section?

Theres a string called SMBIOS table describes a virtual machine - 0 (No). What part of the patch fixes this and tricks the SMBIOS into thinking it's a real machine?

[zhaodice]

@zhaodice Hey, what modification did you apply in the patch file to bypass Characteristics Bit4 of DMI SMBIOS [BIOS Information] (Type 0) section?

Theres a string called SMBIOS table describes a virtual machine - 0 (No). What part of the patch fixes this and tricks the SMBIOS into thinking it's a real machine?

I guess: https://github.com/zhaodice/qemu-anti-detection/blob/e3a72a84bf41edd4e0a067ba00faa6b256b1c6f9/qemu-8.2.0.patch#L728

[Scrut1ny]

@zhaodice Thank you, I don't know how you figured that out. Did you find it off of someone else or... I'm just curious.

[zhaodice]

Thank you, I don't know how you figured that out. Did you find it off of someone else or... I'm just curious.

This is contributed by https://github.com/zhaodice/qemu-anti-detection/commit/0cdd184176778511fba82bf6eee6f7d100b63c4f

[Scrut1ny]

"Spoofed SMBios VM bit" Well he knew what he was trying to accomplish. Thank you so much @Samuil1337!