1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * bpf-script-test-relocation.c
 4 * Test BPF loader checking relocation
 5 */
 6#ifndef LINUX_VERSION_CODE
 7# error Need LINUX_VERSION_CODE
 8# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
 9#endif
10#define BPF_ANY 0
11#define BPF_MAP_TYPE_ARRAY 2
12#define BPF_FUNC_map_lookup_elem 1
13#define BPF_FUNC_map_update_elem 2
14
15static void *(*bpf_map_lookup_elem)(void *map, void *key) =
16	(void *) BPF_FUNC_map_lookup_elem;
17static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) =
18	(void *) BPF_FUNC_map_update_elem;
19
20struct bpf_map_def {
21	unsigned int type;
22	unsigned int key_size;
23	unsigned int value_size;
24	unsigned int max_entries;
25};
26
27#define SEC(NAME) __attribute__((section(NAME), used))
28struct bpf_map_def SEC("maps") my_table = {
29	.type = BPF_MAP_TYPE_ARRAY,
30	.key_size = sizeof(int),
31	.value_size = sizeof(int),
32	.max_entries = 1,
33};
34
35int this_is_a_global_val;
36
37SEC("func=sys_write")
38int bpf_func__sys_write(void *ctx)
39{
40	int key = 0;
41	int value = 0;
42
43	/*
44	 * Incorrect relocation. Should not allow this program be
45	 * loaded into kernel.
46	 */
47	bpf_map_update_elem(&this_is_a_global_val, &key, &value, 0);
48	return 0;
49}
50char _license[] SEC("license") = "GPL";
51int _version SEC("version") = LINUX_VERSION_CODE;