Re: [PATCH v11 07/12] seccomp: add SECCOMP_RET_ERRNO

On 02/24, Will Drewry wrote:

 static u32 seccomp_run_filters(int syscall)
 {
 	struct seccomp_filter *f;
-	u32 ret = SECCOMP_RET_KILL;
 	static const struct bpf_load_fn fns = {
 		bpf_load,
 		sizeof(struct seccomp_data),
 	};
+	u32 ret = SECCOMP_RET_ALLOW;
 	const void *sc_ptr = (const void *)(uintptr_t)syscall;
 
+	/* Ensure unexpected behavior doesn't result in failing open. */
+	if (unlikely(current->seccomp.filter == NULL))
+		ret = SECCOMP_RET_KILL;

Is "seccomp.filter == NULL" really possible?

Oleg.