52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
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// 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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