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@ -14,3 +14,5 @@ Cargo.lock
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# MSVC Windows builds of rustc generate these, which store debugging information
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*.pdb
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# IntelliJ IDEA
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.idea
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@ -0,0 +1,8 @@
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[package]
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name = "laa_toggle"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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@ -0,0 +1,12 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<module type="RUST_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
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<excludeFolder url="file://$MODULE_DIR$/target" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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@ -0,0 +1,76 @@
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use std::env;
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use std::error::Error;
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use std::fs::OpenOptions;
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use std::io::stdin;
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use std::os::windows::fs::FileExt;
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use std::process::{Command, exit};
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fn pause() {
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// call pause command to keep the console open, so the user can read infos/errors
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Command::new("cmd").args(&["/C", "pause"]).spawn().expect("failed to execute pause command");
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}
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fn abort(message: &str, error: Option<&dyn Error>) -> ! {
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if let Some(error) = error {
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println!("{:}", error);
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}
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println!("{}. Abort!", message);
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pause();
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exit(1);
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}
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fn main() {
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const IMAGE_DOS_HEADER_E_LFANEW: u64 = 0x3C;
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const IMAGE_FILE_LARGE_ADDRESS_AWARE: u8 = 0x20;
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const IMAGE_FILE_MACHINE_AMD64: u16 = 0x8664;
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const IMAGE_FILE_MACHINE_I386: u16 = 0x14C;
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let mut buffer2 = [0u8; 2];
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let mut buffer4 = [0u8; 4];
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let args= env::args().collect::<Vec<String>>();
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let path = match args.get(1) {
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None => abort("Didn't receive path to EXE as argument", None),
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Some(path) => path
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};
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if !path.to_lowercase().ends_with(".exe") {
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abort("Argument is not an EXE", None);
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}
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println!("Working on: {}", path);
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let file = match OpenOptions::new().read(true).write(true).open(path) {
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Ok(file) => file,
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Err(error) => abort("Failed to open EXE in read/write mode", Some(&error))
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};
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if let Err(error) = file.seek_read(&mut buffer4, IMAGE_DOS_HEADER_E_LFANEW) {
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abort("Failed to read e_lfanew of MS DOS stub", Some(&error));
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}
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let address_coff_machine = (u32::from_le_bytes(buffer4) + 0x4) as u64; // real data starts after "PE\0\0" string
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if let Err(error) = file.seek_read(&mut buffer2, address_coff_machine) {
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abort("Failed to read Machine of PE header", Some(&error));
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}
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let machine = u16::from_le_bytes(buffer2);
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match machine {
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IMAGE_FILE_MACHINE_I386 => {},
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IMAGE_FILE_MACHINE_AMD64 => abort("This binary is 64 bit - LAA is not needed", None),
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_ => abort(&*format!("Unsupported machine type: {}", machine), None)
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}
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let address_coff_characteristics = address_coff_machine + 0x12;
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if let Err(error) = file.seek_read(&mut buffer2, address_coff_characteristics) {
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abort("Failed to read Characteristics from PE header", Some(&error));
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}
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let is_laa_enabled = buffer2[0] & IMAGE_FILE_LARGE_ADDRESS_AWARE != 0;
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println!("LAA currently enabled: {}\nDo you want to change that [y/n]?", is_laa_enabled);
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let mut input = String::new();
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if let Err(error) = stdin().read_line(&mut input) {
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abort("Failed to read user input from stdin", Some(&error));
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}
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match input.to_lowercase().trim() {
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"y" => {},
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"n" => return,
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_ => abort("Invalid input", None)
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}
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buffer2[0] ^= IMAGE_FILE_LARGE_ADDRESS_AWARE; // flip bit
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if let Err(error) = file.seek_write(buffer2.as_slice(), address_coff_characteristics) {
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abort("Failed to write modification back to file", Some(&error));
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}
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println!("Modification written to disk.");
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pause();
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}
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