diff --git a/components/lwp/lwp_signal.c b/components/lwp/lwp_signal.c
index 1f20ad5096..0bbb98c5d2 100644
--- a/components/lwp/lwp_signal.c
+++ b/components/lwp/lwp_signal.c
@@ -1442,3 +1442,41 @@ rt_err_t lwp_pgrp_signal_kill(rt_processgroup_t pgrp, long signo, long code,
 
     return rc;
 }
+
+struct kill_all_param
+{
+    long signo;
+    long code;
+    lwp_siginfo_ext_t value;
+};
+
+static int _kill_each(pid_t pid, void *data)
+{
+    struct kill_all_param *param = data;
+    rt_lwp_t lwp;
+    rt_err_t error;
+
+    lwp = lwp_from_pid_locked(pid);
+    if (lwp && !lwp->sig_protected)
+    {
+        error = lwp_signal_kill(lwp, param->signo, param->code, param->value);
+    }
+    else
+    {
+        error = RT_EOK;
+    }
+
+    return error;
+}
+
+rt_err_t lwp_signal_kill_all(long signo, long code, lwp_siginfo_ext_t value)
+{
+    struct kill_all_param buf =
+    {
+        .signo = signo,
+        .code = code,
+        .value = value,
+    };
+
+    return lwp_pid_for_each(_kill_each, &buf);
+}
diff --git a/components/lwp/lwp_signal.h b/components/lwp/lwp_signal.h
index f98b43dd3f..7e7bbad920 100644
--- a/components/lwp/lwp_signal.h
+++ b/components/lwp/lwp_signal.h
@@ -229,6 +229,8 @@ rt_err_t lwp_signal_setitimer(struct rt_lwp *lwp, int which,
 
 rt_bool_t lwp_signal_restart_syscall(struct rt_lwp *lwp, int error_code);
 
+rt_err_t lwp_signal_kill_all(long signo, long code, lwp_siginfo_ext_t value);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/lwp/lwp_syscall.c b/components/lwp/lwp_syscall.c
index 598e19ef8a..07d2697958 100644
--- a/components/lwp/lwp_syscall.c
+++ b/components/lwp/lwp_syscall.c
@@ -994,7 +994,7 @@ sysret_t sys_kill(int pid, int signo)
          * of system processes) for which the process has permission to send
          * that signal.
          */
-        kret = -RT_ENOSYS;
+        kret = lwp_signal_kill_all(signo, SI_USER, 0);
     }
 
     switch (kret)