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// 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_misc_output {
int a, b, c;
};
struct core_reloc_misc___a {
int a1;
int a2;
};
struct core_reloc_misc___b {
int b1;
int b2;
};
/* fixed two first members, can be extended with new fields */
struct core_reloc_misc_extensible {
int a;
int b;
};
#define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src)
SEC("raw_tracepoint/sys_enter")
int test_core_misc(void *ctx)
{
struct core_reloc_misc___a *in_a = (void *)&data.in;
struct core_reloc_misc___b *in_b = (void *)&data.in;
struct core_reloc_misc_extensible *in_ext = (void *)&data.in;
struct core_reloc_misc_output *out = (void *)&data.out;
/* record two different relocations with the same accessor string */
if (CORE_READ(&out->a, &in_a->a1) || /* accessor: 0:0 */
CORE_READ(&out->b, &in_b->b1)) /* accessor: 0:0 */
return 1;
/* Validate relocations capture array-only accesses for structs with
* fixed header, but with potentially extendable tail. This will read
* first 4 bytes of 2nd element of in_ext array of potentially
* variably sized struct core_reloc_misc_extensible. */
if (CORE_READ(&out->c, &in_ext[2])) /* accessor: 2 */
return 1;
return 0;
}
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