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 #if !defined(__clang__) 8 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized" 9 #endif 10 11 struct Small { 12 long x; 13 }; 14 15 struct Big { 16 long x; 17 long y; 18 }; 19 foo(const struct Big * big)20__noinline int foo(const struct Big *big) 21 { 22 if (!big) 23 return 0; 24 25 return bpf_get_prandom_u32() < big->y; 26 } 27 28 SEC("cgroup_skb/ingress") 29 __failure __msg("invalid indirect access to stack") global_func10(struct __sk_buff * skb)30int global_func10(struct __sk_buff *skb) 31 { 32 const struct Small small = {.x = skb->len }; 33 34 return foo((struct Big *)&small) ? 1 : 0; 35 } 36