Collect envs in AsanModuleBuilder::default() (AFLplusplus#2921)

* collect envs in AsanModuleBuilder::default

* migration

* fmt

MIGRATION.md

@@ -5,6 +5,7 @@
   - `EventProcessor` is responsible for evaluating the testcases passed by the `EventReceiver`.
   - Since we don't evaluate testcases in the `EventManager` anymore. `on_fire` and `post_exec` have been deleted from `EventManagerHook`.
   - Similarly `pre_exec` has been renamed to `pre_receive`.
+- `AsanModule` now uses a `builder()` method for constructing its instances.
 
 # 0.14.1 -> 0.15.0
 - `MmapShMem::new` and `MmapShMemProvider::new_shmem_with_id` now take `AsRef<Path>` instead of a byte array for the filename/id.

libafl_qemu/src/modules/usermode/asan.rs

@@ -133,7 +133,7 @@ pub enum AsanError {
 }
 
 pub struct AsanModuleBuilder {
-    env: Option<Vec<(String, String)>>,
+    env: Vec<(String, String)>,
     detect_leaks: bool,
     snapshot: bool,
     filter: StdAddressFilter,
@@ -234,7 +234,7 @@ impl Debug for AsanGiovese {
 impl AsanModuleBuilder {
     #[must_use]
     pub fn new(
-        env: Option<Vec<(String, String)>>,
+        env: Vec<(String, String)>,
         detect_leaks: bool,
         snapshot: bool,
         filter: StdAddressFilter,
@@ -252,7 +252,7 @@ impl AsanModuleBuilder {
     #[must_use]
     pub fn env(self, env: &[(String, String)]) -> Self {
         Self::new(
-            Some(env.to_vec()),
+            env.to_vec(),
             self.detect_leaks,
             self.snapshot,
             self.filter,
@@ -324,7 +324,7 @@ impl AsanModuleBuilder {
     #[must_use]
     pub fn build(self) -> AsanModule {
         AsanModule::new(
-            self.env.unwrap().as_ref(),
+            self.env.as_ref(),
             self.detect_leaks,
             self.snapshot,
             self.filter,
@@ -335,7 +335,11 @@ impl AsanModuleBuilder {
 
 impl Default for AsanModuleBuilder {
     fn default() -> Self {
-        Self::new(None, false, true, StdAddressFilter::default(), None)
+        let env = env::vars()
+            .filter(|(k, _v)| k != "LD_LIBRARY_PATH")
+            .collect::<Vec<(String, String)>>();
+
+        Self::new(env, false, true, StdAddressFilter::default(), None)
     }
 }