1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <stddef.h>
3 #include <linux/bpf.h>
4 #include <bpf/bpf_helpers.h>
5 #include "bpf_misc.h"
6 
7 struct Small {
8 	long x;
9 };
10 
11 struct Big {
12 	long x;
13 	long y;
14 };
15 
foo(const struct Big * big)16 __noinline int foo(const struct Big *big)
17 {
18 	if (!big)
19 		return 0;
20 
21 	return bpf_get_prandom_u32() < big->y;
22 }
23 
24 SEC("cgroup_skb/ingress")
25 __failure __msg("invalid indirect access to stack")
global_func10(struct __sk_buff * skb)26 int global_func10(struct __sk_buff *skb)
27 {
28 	const struct Small small = {.x = skb->len };
29 
30 	return foo((struct Big *)&small) ? 1 : 0;
31 }
32