// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2019 Facebook #include <linux/bpf.h> #include <stdint.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_core_read.h> char _license[] SEC("license") = "GPL"; struct { char in[256]; char out[256]; } data = {}; struct core_reloc_nesting_substruct { int a; }; union core_reloc_nesting_subunion { int b; }; /* int a.a.a and b.b.b accesses */ struct core_reloc_nesting { union { struct core_reloc_nesting_substruct a; } a; struct { union core_reloc_nesting_subunion b; } b; }; #define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src) SEC("raw_tracepoint/sys_enter") int test_core_nesting(void *ctx) { struct core_reloc_nesting *in = (void *)&data.in; struct core_reloc_nesting *out = (void *)&data.out; if (CORE_READ(&out->a.a.a, &in->a.a.a)) return 1; if (CORE_READ(&out->b.b.b, &in->b.b.b)) return 1; return 0; }