b915ebe6d9
Add tests for libbpf relocation of static variable references into the .data, .rodata and .bss sections of the ELF, also add read-only test for .rodata. All passing: # ./test_progs [...] test_global_data:PASS:load program 0 nsec test_global_data:PASS:pass global data run 925 nsec test_global_data_number:PASS:relocate .bss reference 925 nsec test_global_data_number:PASS:relocate .data reference 925 nsec test_global_data_number:PASS:relocate .rodata reference 925 nsec test_global_data_number:PASS:relocate .bss reference 925 nsec test_global_data_number:PASS:relocate .data reference 925 nsec test_global_data_number:PASS:relocate .rodata reference 925 nsec test_global_data_number:PASS:relocate .bss reference 925 nsec test_global_data_number:PASS:relocate .bss reference 925 nsec test_global_data_number:PASS:relocate .rodata reference 925 nsec test_global_data_number:PASS:relocate .rodata reference 925 nsec test_global_data_number:PASS:relocate .rodata reference 925 nsec test_global_data_string:PASS:relocate .rodata reference 925 nsec test_global_data_string:PASS:relocate .data reference 925 nsec test_global_data_string:PASS:relocate .bss reference 925 nsec test_global_data_string:PASS:relocate .data reference 925 nsec test_global_data_string:PASS:relocate .bss reference 925 nsec test_global_data_struct:PASS:relocate .rodata reference 925 nsec test_global_data_struct:PASS:relocate .bss reference 925 nsec test_global_data_struct:PASS:relocate .rodata reference 925 nsec test_global_data_struct:PASS:relocate .data reference 925 nsec test_global_data_rdonly:PASS:test .rodata read-only map 925 nsec [...] Summary: 229 PASSED, 0 FAILED Note map helper signatures have been changed to avoid warnings when passing in const data. Joint work with Daniel Borkmann. Signed-off-by: Joe Stringer <joe@wand.net.nz> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Isovalent, Inc.
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#include <linux/bpf.h>
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#include <linux/pkt_cls.h>
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#include <string.h>
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#include "bpf_helpers.h"
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struct bpf_map_def SEC("maps") result_number = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(__u32),
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.value_size = sizeof(__u64),
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.max_entries = 11,
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};
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struct bpf_map_def SEC("maps") result_string = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(__u32),
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.value_size = 32,
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.max_entries = 5,
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};
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struct foo {
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__u8 a;
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__u32 b;
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__u64 c;
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};
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struct bpf_map_def SEC("maps") result_struct = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(__u32),
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.value_size = sizeof(struct foo),
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.max_entries = 5,
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};
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/* Relocation tests for __u64s. */
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static __u64 num0;
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static __u64 num1 = 42;
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static const __u64 num2 = 24;
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static __u64 num3 = 0;
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static __u64 num4 = 0xffeeff;
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static const __u64 num5 = 0xabab;
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static const __u64 num6 = 0xab;
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/* Relocation tests for strings. */
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static const char str0[32] = "abcdefghijklmnopqrstuvwxyz";
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static char str1[32] = "abcdefghijklmnopqrstuvwxyz";
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static char str2[32];
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/* Relocation tests for structs. */
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static const struct foo struct0 = {
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.a = 42,
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.b = 0xfefeefef,
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.c = 0x1111111111111111ULL,
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};
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static struct foo struct1;
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static const struct foo struct2;
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static struct foo struct3 = {
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.a = 41,
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.b = 0xeeeeefef,
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.c = 0x2111111111111111ULL,
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};
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#define test_reloc(map, num, var) \
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do { \
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__u32 key = num; \
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bpf_map_update_elem(&result_##map, &key, var, 0); \
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} while (0)
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SEC("static_data_load")
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int load_static_data(struct __sk_buff *skb)
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{
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static const __u64 bar = ~0;
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test_reloc(number, 0, &num0);
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test_reloc(number, 1, &num1);
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test_reloc(number, 2, &num2);
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test_reloc(number, 3, &num3);
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test_reloc(number, 4, &num4);
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test_reloc(number, 5, &num5);
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num4 = 1234;
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test_reloc(number, 6, &num4);
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test_reloc(number, 7, &num0);
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test_reloc(number, 8, &num6);
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test_reloc(string, 0, str0);
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test_reloc(string, 1, str1);
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test_reloc(string, 2, str2);
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str1[5] = 'x';
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test_reloc(string, 3, str1);
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__builtin_memcpy(&str2[2], "hello", sizeof("hello"));
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test_reloc(string, 4, str2);
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test_reloc(struct, 0, &struct0);
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test_reloc(struct, 1, &struct1);
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test_reloc(struct, 2, &struct2);
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test_reloc(struct, 3, &struct3);
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test_reloc(number, 9, &struct0.c);
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test_reloc(number, 10, &bar);
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return TC_ACT_OK;
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}
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char _license[] SEC("license") = "GPL";
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