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51 lines
1.3 KiB
51 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* bpf-script-test-relocation.c |
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* Test BPF loader checking relocation |
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*/ |
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#ifndef LINUX_VERSION_CODE |
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# error Need LINUX_VERSION_CODE |
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# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig' |
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#endif |
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#define BPF_ANY 0 |
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#define BPF_MAP_TYPE_ARRAY 2 |
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#define BPF_FUNC_map_lookup_elem 1 |
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#define BPF_FUNC_map_update_elem 2 |
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static void *(*bpf_map_lookup_elem)(void *map, void *key) = |
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(void *) BPF_FUNC_map_lookup_elem; |
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static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) = |
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(void *) BPF_FUNC_map_update_elem; |
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struct bpf_map_def { |
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unsigned int type; |
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unsigned int key_size; |
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unsigned int value_size; |
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unsigned int max_entries; |
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}; |
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#define SEC(NAME) __attribute__((section(NAME), used)) |
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struct bpf_map_def SEC("maps") my_table = { |
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.type = BPF_MAP_TYPE_ARRAY, |
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.key_size = sizeof(int), |
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.value_size = sizeof(int), |
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.max_entries = 1, |
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}; |
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int this_is_a_global_val; |
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SEC("func=sys_write") |
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int bpf_func__sys_write(void *ctx) |
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{ |
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int key = 0; |
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int value = 0; |
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/* |
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* Incorrect relocation. Should not allow this program be |
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* loaded into kernel. |
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*/ |
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bpf_map_update_elem(&this_is_a_global_val, &key, &value, 0); |
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return 0; |
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} |
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char _license[] SEC("license") = "GPL"; |
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int _version SEC("version") = LINUX_VERSION_CODE;
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