fix: inherit heap on fork and reset set_child_tid on execve (#93)

Co-authored-by: sunhaosheng <sunhaosheng@kylinos.cn>

Author: Sam-nankai

api/src/syscall/task/clone.rs

@@ -182,6 +182,9 @@ pub fn sys_clone(
             exit_signal,
         );
         proc_data.set_umask(old_proc_data.umask());
+        // Inherit heap pointers from parent to ensure child's heap state is consistent after fork
+        proc_data.set_heap_bottom(old_proc_data.get_heap_bottom());
+        proc_data.set_heap_top(old_proc_data.get_heap_top());
 
         {
             let mut scope = proc_data.scope.write();

api/src/syscall/task/execve.rs

@@ -65,6 +65,9 @@ pub fn sys_execve(
 
     *proc_data.signal.actions.lock() = Default::default();
 
+    // Clear set_child_tid after exec since the original address is no longer valid
+    curr.as_thread().set_clear_child_tid(0);
+
     // Close CLOEXEC file descriptors
     let mut fd_table = FD_TABLE.write();
     let cloexec_fds = fd_table

api/src/task.rs

@@ -33,6 +33,7 @@ pub fn new_user_task(
     TaskInner::new(
         move || {
             let curr = axtask::current();
+
             access_user_memory(|| {
                 if let Some(tid) = set_child_tid {
                     *tid = curr.id().as_u64() as Pid;