Properly use in_handler (#2957)

* properly use it

* a

* a

* typo

fuzzers/binary_only/fuzzbench_qemu/src/fuzzer.rs

@@ -48,18 +48,11 @@ use libafl_bolts::{
 use libafl_qemu::{
     elf::EasyElf,
     filter_qemu_args,
-    // asan::{init_with_asan, QemuAsanHelper},
+    modules::{
-    modules::cmplog::{CmpLogModule, CmpLogObserver},
+        cmplog::{CmpLogModule, CmpLogObserver},
-    modules::edges::StdEdgeCoverageModule,
+        edges::StdEdgeCoverageModule,
-    modules::AsanModule,
+    },
-    Emulator,
+    Emulator, GuestReg, MmapPerms, QemuExecutor, QemuExitError, QemuExitReason, QemuShutdownCause,
-    GuestReg,
-    //snapshot::QemuSnapshotHelper,
-    MmapPerms,
-    QemuExecutor,
-    QemuExitError,
-    QemuExitReason,
-    QemuShutdownCause,
     Regs,
 };
 use libafl_targets::{edges_map_mut_ptr, EDGES_MAP_ALLOCATED_SIZE, MAX_EDGES_FOUND};

libafl/src/executors/hooks/unix.rs

@@ -52,6 +52,12 @@ pub mod unix_signal_handler {
             unsafe {
                 let data = &raw mut GLOBAL_STATE;
                 let in_handler = (*data).set_in_handler(true);
+
+                assert!(
+                    !in_handler,
+                    "We crashed inside a crash handler, but this should never happen!"
+                );
+
                 match signal {
                     Signal::SigUser2 | Signal::SigAlarm => {
                         if !(*data).timeout_handler.is_null() {
@@ -91,6 +97,12 @@ pub mod unix_signal_handler {
             old_hook(panic_info);
             let data = &raw mut GLOBAL_STATE;
             let in_handler = (*data).set_in_handler(true);
+
+            assert!(
+                !in_handler,
+                "We crashed inside a crash panic hook, but this should never happen!"
+            );
+
             if (*data).is_valid() {
                 // We are fuzzing!
                 let executor = (*data).executor_mut::<E>();

libafl/src/executors/hooks/windows.rs

@@ -34,7 +34,13 @@ pub mod windows_asan_handler {
         Z: HasObjective<Objective = OF>,
     {
         let data = &raw mut GLOBAL_STATE;
-        (*data).set_in_handler(true);
+        let in_handler = (*data).set_in_handler(true);
+
+        assert!(
+            !in_handler,
+            "We crashed inside a asan death handler, but this should never happen!"
+        );
+
         // Have we set a timer_before?
         if (*data).ptp_timer.is_some() {
             /*
@@ -159,6 +165,12 @@ pub mod windows_exception_handler {
             unsafe {
                 let data = &raw mut GLOBAL_STATE;
                 let in_handler = (*data).set_in_handler(true);
+
+                assert!(
+                    !in_handler,
+                    "We crashed inside a crash handler, but this should never happen!"
+                );
+
                 if !(*data).crash_handler.is_null() {
                     let func: HandlerFuncPtr = transmute((*data).crash_handler);
                     (func)(exception_pointers, data);
@@ -193,6 +205,12 @@ pub mod windows_exception_handler {
         panic::set_hook(Box::new(move |panic_info| unsafe {
             let data = &raw mut GLOBAL_STATE;
             let in_handler = (*data).set_in_handler(true);
+
+            assert!(
+                !in_handler,
+                "We crashed inside a panic hook, but this should never happen!"
+            );
+
             // Have we set a timer_before?
             if (*data).ptp_timer.is_some() {
                 /*