1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index d041645d9d17..4e9822a87aab 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -1227,6 +1227,12 @@ int ptrace_request(struct task_struct *child, long request,
 	case PTRACE_SETSIGMASK: {
 		sigset_t new_set;
 
+		/* A user worker only ever takes SIGKILL and SIGSTOP. */
+		if (child->flags & PF_USER_WORKER) {
+			ret = -EPERM;
+			break;
+		}
+
 		if (addr != sizeof(sigset_t)) {
 			ret = -EINVAL;
 			break;