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 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") 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