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selftests/bpf: add CO-RE relocs misc tests

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Add tests validating few edge-cases of capturing offset relocations.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2019-08-07 14:40:01 -07:00 committed by Alexei Starovoitov
parent c1f5e7dd19
commit 29e1c66872
4 changed files with 106 additions and 0 deletions
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19
tools/testing/selftests/bpf/prog_tests/core_reloc.c
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@ -260,6 +260,25 @@ static struct core_reloc_test_case test_cases[] = {
INTS_ERR_CASE(ints___err_wrong_sz_16),
INTS_ERR_CASE(ints___err_wrong_sz_32),
INTS_ERR_CASE(ints___err_wrong_sz_64),
/* validate edge cases of capturing relocations */
{
.case_name = "misc",
.bpf_obj_file = "test_core_reloc_misc.o",
.btf_src_file = "btf__core_reloc_misc.o",
.input = (const char *)&(struct core_reloc_misc_extensible[]){
{ .a = 1 },
{ .a = 2 }, /* not read */
{ .a = 3 },
},
.input_len = 4 * sizeof(int),
.output = STRUCT_TO_CHAR_PTR(core_reloc_misc_output) {
.a = 1,
.b = 1,
.c = 0, /* BUG in clang, should be 3 */
},
.output_len = sizeof(struct core_reloc_misc_output),
},
};
struct data {

5
tools/testing/selftests/bpf/progs/btf__core_reloc_misc.c Normal file
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@ -0,0 +1,5 @@
#include "core_reloc_types.h"
void f1(struct core_reloc_misc___a x) {}
void f2(struct core_reloc_misc___b x) {}
void f3(struct core_reloc_misc_extensible x) {}

25
tools/testing/selftests/bpf/progs/core_reloc_types.h
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@ -640,3 +640,28 @@ struct core_reloc_ints___err_wrong_sz_64 {
uint32_t u64_field; /* not 64-bit anymore */
int32_t s64_field; /* not 64-bit anymore */
};
/*
* MISC
*/
struct core_reloc_misc_output {
int a, b, c;
};
struct core_reloc_misc___a {
int a1;
int a2;
};
struct core_reloc_misc___b {
int b1;
int b2;
};
/* this one extends core_reloc_misc_extensible struct from BPF prog */
struct core_reloc_misc_extensible {
int a;
int b;
int c;
int d;
};

57
tools/testing/selftests/bpf/progs/test_core_reloc_misc.c Normal file
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@ -0,0 +1,57 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include <linux/bpf.h>
#include <stdint.h>
#include "bpf_helpers.h"
char _license[] SEC("license") = "GPL";
static volatile struct data {
char in[256];
char out[256];
} data;
struct core_reloc_misc_output {
int a, b, c;
};
struct core_reloc_misc___a {
int a1;
int a2;
};
struct core_reloc_misc___b {
int b1;
int b2;
};
/* fixed two first members, can be extended with new fields */
struct core_reloc_misc_extensible {
int a;
int b;
};
SEC("raw_tracepoint/sys_enter")
int test_core_misc(void *ctx)
{
struct core_reloc_misc___a *in_a = (void *)&data.in;
struct core_reloc_misc___b *in_b = (void *)&data.in;
struct core_reloc_misc_extensible *in_ext = (void *)&data.in;
struct core_reloc_misc_output *out = (void *)&data.out;
/* record two different relocations with the same accessor string */
if (BPF_CORE_READ(&out->a, &in_a->a1) || /* accessor: 0:0 */
BPF_CORE_READ(&out->b, &in_b->b1)) /* accessor: 0:0 */
return 1;
/* Validate relocations capture array-only accesses for structs with
* fixed header, but with potentially extendable tail. This will read
* first 4 bytes of 2nd element of in_ext array of potentially
* variably sized struct core_reloc_misc_extensible. */
if (BPF_CORE_READ(&out->c, &in_ext[2])) /* accessor: 2 */
return 1;
return 0;
}