error: unsafe attribute used without unsafe

[kayabaguette]

OS

# cat /etc/fedora-release 
Fedora release 41 (Forty One)

Current environment

Rust version

# rustup --version
rustup 1.27.1
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.85.0 (4d91de4e4 2025-02-17)`

Targets installed

# rustup target list | grep "(installed)"
x86_64-pc-windows-gnu (installed)
x86_64-unknown-linux-gnu (installed)

Command and result

# ./FaceDancer_linux_amd64 attack -P msedge -O test.dll -I Payload.dll 

    ___________                   ________                                    
    \_   _____/____    ____  ____ \______ \ _____    ____   ____  ___________ 
     |    __) \__  \ _/ ___\/ __ \ |    |  \\__  \  /    \_/ ___\/ __ \_  __ \
     |     \   / __ \\  \__\  ___/ |    `   \/ __ \|   |  \  \__\  ___/|  | \/
     \___  /  (____  /\___  >___  >_______  (____  /___|  /\___  >___  >__|   
         \/        \/     \/    \/        \/     \/     \/     \/    \/                                              
                                    (@Tyl0us)
                
[+] Execution mode: 'Targeted Process' proxying selected
[*] msedge selected for creation
[*] Created new Rust project: msedge
[*] Starting SRDI processing of Payload.dll 
[*] SRDI process completed
[*] Chose a random COM related to process msedge: {1299CF18-C4F5-4B6A-BB0F-2299F0398E27}
[*] Added dependency to Cargo.toml
[*] Adding Process check
[+] DLL will only run under msedge.exe
[*] Sandbox evasion not enabled...
[*] Compiling Payload... please be patient
error: unsafe attribute used without unsafe
  --> src/lib.rs:40:3
   |
40 | #[no_mangle]
   |   ^^^^^^^^^ usage of unsafe attribute
   |
help: wrap the attribute in `unsafe(...)`
   |
40 | #[unsafe(no_mangle)]
   |   +++++++         +

error: could not compile `msedge` (lib) due to 1 previous error
Error: 'cargo build' failed. Please ensure you have the following:
- The Target 'x86_64-pc-windows-gnu'

Note : This error appears whatever the payload we want to compile.

Current solution

In file lib/src/lib.rs : update the line 60 from : #[no_mangle] to #[unsafe(no_mangle)] then build the project.

[Tylous]

I think this issue is related to the change between the editions. Originally the default was 2021 and now it's 2024. It's something I'll have to address in the new version.

[deep4lpha]

Just change line 60 in lib/src/lib.rs to #[unsafe(no_mangle)] and recompile FaceDancer to fix.