| // 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_flavors { |
| int a; |
| int b; |
| int c; |
| }; |
| |
| /* local flavor with reversed layout */ |
| struct core_reloc_flavors___reversed { |
| int c; |
| int b; |
| int a; |
| }; |
| |
| /* local flavor with nested/overlapping layout */ |
| struct core_reloc_flavors___weird { |
| struct { |
| int b; |
| }; |
| /* a and c overlap in local flavor, but this should still work |
| * correctly with target original flavor |
| */ |
| union { |
| int a; |
| int c; |
| }; |
| }; |
| |
| #define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src) |
| |
| SEC("raw_tracepoint/sys_enter") |
| int test_core_flavors(void *ctx) |
| { |
| struct core_reloc_flavors *in_orig = (void *)&data.in; |
| struct core_reloc_flavors___reversed *in_rev = (void *)&data.in; |
| struct core_reloc_flavors___weird *in_weird = (void *)&data.in; |
| struct core_reloc_flavors *out = (void *)&data.out; |
| |
| /* read a using weird layout */ |
| if (CORE_READ(&out->a, &in_weird->a)) |
| return 1; |
| /* read b using reversed layout */ |
| if (CORE_READ(&out->b, &in_rev->b)) |
| return 1; |
| /* read c using original layout */ |
| if (CORE_READ(&out->c, &in_orig->c)) |
| return 1; |
| |
| return 0; |
| } |
| |