expose exec_path to Rust

qemu_libafl_bridge/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "qemu_libafl_bridge"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Andrea Fioraldi <andreafioraldi@gmail.com>"]
 description = "QEMU and LibAFL bridge lib"
 repository = "https://github.com/AFLplusplus/qemu-libafl-bridge/"

qemu_libafl_bridge/src/lib.rs

@@ -1,5 +1,6 @@
 use core::{convert::Into, mem::transmute, ptr::copy_nonoverlapping};
 use num::Num;
+use std::{slice::from_raw_parts, str::from_utf8_unchecked};
 
 pub mod amd64;
 pub mod x86;
@@ -20,6 +21,9 @@ extern "C" {
     fn libafl_qemu_remove_breakpoint(addr: u64) -> i32;
     fn libafl_qemu_run() -> i32;
 
+    fn strlen(s: *const u8) -> usize;
+
+    static exec_path: *const u8;
     static guest_base: isize;
 }
 
@@ -95,6 +99,10 @@ impl QemuEmulator {
         unsafe { transmute(addr - guest_base) }
     }
 
+    pub fn exec_path(&self) -> &str {
+        unsafe { from_utf8_unchecked(from_raw_parts(exec_path, strlen(exec_path) + 1)) }
+    }
+
     pub fn new() -> Self {
         Self {}
     }

qemu_libafl_bridge/src/weaks.c

@@ -31,4 +31,5 @@ __attribute__((weak)) int libafl_qemu_run() {
   return 0;
 }
 
+__attribute__((weak)) char* exec_path = NULL;
 __attribute__((weak)) size_t guest_base = 0;