bpf-script-test-relocation.c (1331B)
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;