| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | // Copyright (c) 2019 Facebook |
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| 3 | |
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| 4 | #include <linux/bpf.h> |
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| 5 | #include <stdint.h> |
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| 6 | #include <bpf/bpf_helpers.h> |
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| 7 | #include <bpf/bpf_core_read.h> |
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| 8 | |
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| 9 | char _license[] SEC("license" ) = "GPL" ; |
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| 10 | |
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| 11 | struct { |
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| 12 | char in[256]; |
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| 13 | char out[256]; |
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| 14 | } data = {}; |
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| 15 | |
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| 16 | struct core_reloc_flavors { |
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| 17 | int a; |
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| 18 | int b; |
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| 19 | int c; |
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| 20 | }; |
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| 21 | |
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| 22 | /* local flavor with reversed layout */ |
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| 23 | struct core_reloc_flavors___reversed { |
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| 24 | int c; |
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| 25 | int b; |
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| 26 | int a; |
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| 27 | }; |
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| 28 | |
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| 29 | /* local flavor with nested/overlapping layout */ |
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| 30 | struct core_reloc_flavors___weird { |
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| 31 | struct { |
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| 32 | int b; |
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| 33 | }; |
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| 34 | /* a and c overlap in local flavor, but this should still work |
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| 35 | * correctly with target original flavor |
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| 36 | */ |
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| 37 | union { |
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| 38 | int a; |
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| 39 | int c; |
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| 40 | }; |
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| 41 | }; |
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| 42 | |
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| 43 | #define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src) |
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| 44 | |
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| 45 | SEC("raw_tracepoint/sys_enter" ) |
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| 46 | int test_core_flavors(void *ctx) |
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| 47 | { |
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| 48 | struct core_reloc_flavors *in_orig = (void *)&data.in; |
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| 49 | struct core_reloc_flavors___reversed *in_rev = (void *)&data.in; |
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| 50 | struct core_reloc_flavors___weird *in_weird = (void *)&data.in; |
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| 51 | struct core_reloc_flavors *out = (void *)&data.out; |
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| 52 | |
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| 53 | /* read a using weird layout */ |
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| 54 | if (CORE_READ(&out->a, &in_weird->a)) |
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| 55 | return 1; |
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| 56 | /* read b using reversed layout */ |
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| 57 | if (CORE_READ(&out->b, &in_rev->b)) |
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| 58 | return 1; |
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| 59 | /* read c using original layout */ |
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| 60 | if (CORE_READ(&out->c, &in_orig->c)) |
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| 61 | return 1; |
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| 62 | |
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| 63 | return 0; |
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| 64 | } |
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| 65 | |
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| 66 | |
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