diff --git a/kernel/src/syscall/rt_sigaction.rs b/kernel/src/syscall/rt_sigaction.rs
index 5703fbe7e..8a0b608f5 100644
--- a/kernel/src/syscall/rt_sigaction.rs
+++ b/kernel/src/syscall/rt_sigaction.rs
@@ -22,6 +22,10 @@ pub fn sys_rt_sigaction(
         sigset_size
     );
 
+    if sigset_size != 8 {
+        return_errno_with_message!(Errno::EINVAL, "sigset size is not equal to 8");
+    }
+
     let mut sig_dispositions = ctx.process.sig_dispositions().lock();
 
     let old_action = if sig_action_addr != 0 {
diff --git a/kernel/src/syscall/rt_sigprocmask.rs b/kernel/src/syscall/rt_sigprocmask.rs
index f7399edb1..62c1a9ba1 100644
--- a/kernel/src/syscall/rt_sigprocmask.rs
+++ b/kernel/src/syscall/rt_sigprocmask.rs
@@ -24,7 +24,7 @@ pub fn sys_rt_sigprocmask(
         mask_op, set_ptr, oldset_ptr, sigset_size
     );
     if sigset_size != 8 {
-        error!("sigset size is not equal to 8");
+        return_errno_with_message!(Errno::EINVAL, "sigset size is not equal to 8");
     }
     do_rt_sigprocmask(mask_op, set_ptr, oldset_ptr, ctx)?;
     Ok(SyscallReturn::Return(0))
diff --git a/kernel/src/syscall/rt_sigsuspend.rs b/kernel/src/syscall/rt_sigsuspend.rs
index 10a34089a..40043a539 100644
--- a/kernel/src/syscall/rt_sigsuspend.rs
+++ b/kernel/src/syscall/rt_sigsuspend.rs
@@ -22,7 +22,6 @@ pub fn sys_rt_sigsuspend(
         sigmask_addr, sigmask_size
     );
 
-    debug_assert!(sigmask_size == core::mem::size_of::<SigMask>());
     if sigmask_size != core::mem::size_of::<SigMask>() {
         return_errno_with_message!(Errno::EINVAL, "invalid sigmask size");
     }