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7b6982ce WN |
1 | /* |
2 | * bpf-script-test-relocation.c | |
3 | * Test BPF loader checking relocation | |
4 | */ | |
5 | #ifndef LINUX_VERSION_CODE | |
6 | # error Need LINUX_VERSION_CODE | |
7 | # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig' | |
8 | #endif | |
9 | #define BPF_ANY 0 | |
10 | #define BPF_MAP_TYPE_ARRAY 2 | |
11 | #define BPF_FUNC_map_lookup_elem 1 | |
12 | #define BPF_FUNC_map_update_elem 2 | |
13 | ||
14 | static void *(*bpf_map_lookup_elem)(void *map, void *key) = | |
15 | (void *) BPF_FUNC_map_lookup_elem; | |
16 | static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) = | |
17 | (void *) BPF_FUNC_map_update_elem; | |
18 | ||
19 | struct bpf_map_def { | |
20 | unsigned int type; | |
21 | unsigned int key_size; | |
22 | unsigned int value_size; | |
23 | unsigned int max_entries; | |
24 | }; | |
25 | ||
26 | #define SEC(NAME) __attribute__((section(NAME), used)) | |
27 | struct bpf_map_def SEC("maps") my_table = { | |
28 | .type = BPF_MAP_TYPE_ARRAY, | |
29 | .key_size = sizeof(int), | |
30 | .value_size = sizeof(int), | |
31 | .max_entries = 1, | |
32 | }; | |
33 | ||
34 | int this_is_a_global_val; | |
35 | ||
36 | SEC("func=sys_write") | |
37 | int bpf_func__sys_write(void *ctx) | |
38 | { | |
39 | int key = 0; | |
40 | int value = 0; | |
41 | ||
42 | /* | |
43 | * Incorrect relocation. Should not allow this program be | |
44 | * loaded into kernel. | |
45 | */ | |
46 | bpf_map_update_elem(&this_is_a_global_val, &key, &value, 0); | |
47 | return 0; | |
48 | } | |
49 | char _license[] SEC("license") = "GPL"; | |
50 | int _version SEC("version") = LINUX_VERSION_CODE; |