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selftests/bpf: Add flexible array relocation tests 

Add few tests validation CO-RE relocation handling of flexible array accesses.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191215070844.1014385-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2019-12-14 23:08:44 -08:00 committed by Alexei Starovoitov
parent 1b484b301c
commit 5f2eeceffb
6 changed files with 56 additions and 4 deletions
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4
tools/testing/selftests/bpf/prog_tests/core_reloc.c
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@ -74,6 +74,7 @@
.b123 = 2, \
.c1c = 3, \
.d00d = 4, \
.f10c = 0, \
}, \
.output_len = sizeof(struct core_reloc_arrays_output) \
}
@ -308,12 +309,15 @@ static struct core_reloc_test_case test_cases[] = {
ARRAYS_CASE(arrays),
ARRAYS_CASE(arrays___diff_arr_dim),
ARRAYS_CASE(arrays___diff_arr_val_sz),
ARRAYS_CASE(arrays___equiv_zero_sz_arr),
ARRAYS_CASE(arrays___fixed_arr),
ARRAYS_ERR_CASE(arrays___err_too_small),
ARRAYS_ERR_CASE(arrays___err_too_shallow),
ARRAYS_ERR_CASE(arrays___err_non_array),
ARRAYS_ERR_CASE(arrays___err_wrong_val_type1),
ARRAYS_ERR_CASE(arrays___err_wrong_val_type2),
ARRAYS_ERR_CASE(arrays___err_bad_zero_sz_arr),
/* enum/ptr/int handling scenarios */
PRIMITIVES_CASE(primitives),

3
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___equiv_zero_sz_arr.c Normal file
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@ -0,0 +1,3 @@
#include "core_reloc_types.h"
void f(struct core_reloc_arrays___equiv_zero_sz_arr x) {}

3
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___err_bad_zero_sz_arr.c Normal file
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@ -0,0 +1,3 @@
#include "core_reloc_types.h"
void f(struct core_reloc_arrays___err_bad_zero_sz_arr x) {}

3
tools/testing/selftests/bpf/progs/btf__core_reloc_arrays___fixed_arr.c Normal file
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@ -0,0 +1,3 @@
#include "core_reloc_types.h"
void f(struct core_reloc_arrays___fixed_arr x) {}

39
tools/testing/selftests/bpf/progs/core_reloc_types.h
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@ -327,6 +327,7 @@ struct core_reloc_arrays_output {
char b123;
int c1c;
int d00d;
int f10c;
};
struct core_reloc_arrays_substruct {
@ -339,6 +340,7 @@ struct core_reloc_arrays {
char b[2][3][4];
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
struct core_reloc_arrays_substruct f[][2];
};
/* bigger array dimensions */
@ -347,6 +349,7 @@ struct core_reloc_arrays___diff_arr_dim {
char b[3][4][5];
struct core_reloc_arrays_substruct c[4];
struct core_reloc_arrays_substruct d[2][3];
struct core_reloc_arrays_substruct f[1][3];
};
/* different size of array's value (struct) */
@ -363,6 +366,29 @@ struct core_reloc_arrays___diff_arr_val_sz {
int d;
int __padding2;
} d[1][2];
struct {
int __padding1;
int c;
int __padding2;
} f[][2];
};
struct core_reloc_arrays___equiv_zero_sz_arr {
int a[5];
char b[2][3][4];
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
/* equivalent to flexible array */
struct core_reloc_arrays_substruct f[0][2];
};
struct core_reloc_arrays___fixed_arr {
int a[5];
char b[2][3][4];
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
/* not a flexible array anymore, but within access bounds */
struct core_reloc_arrays_substruct f[1][2];
};
struct core_reloc_arrays___err_too_small {
@ -370,6 +396,7 @@ struct core_reloc_arrays___err_too_small {
char b[2][3][4];
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
struct core_reloc_arrays_substruct f[][2];
};
struct core_reloc_arrays___err_too_shallow {
@ -377,6 +404,7 @@ struct core_reloc_arrays___err_too_shallow {
char b[2][3]; /* this one lacks one dimension */
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
struct core_reloc_arrays_substruct f[][2];
};
struct core_reloc_arrays___err_non_array {
@ -384,6 +412,7 @@ struct core_reloc_arrays___err_non_array {
char b[2][3][4];
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
struct core_reloc_arrays_substruct f[][2];
};
struct core_reloc_arrays___err_wrong_val_type {
@ -391,6 +420,16 @@ struct core_reloc_arrays___err_wrong_val_type {
char b[2][3][4];
int c[3]; /* value is not a struct */
struct core_reloc_arrays_substruct d[1][2];
struct core_reloc_arrays_substruct f[][2];
};
struct core_reloc_arrays___err_bad_zero_sz_arr {
/* zero-sized array, but not at the end */
struct core_reloc_arrays_substruct f[0][2];
int a[5];
char b[2][3][4];
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
};
/*

8
tools/testing/selftests/bpf/progs/test_core_reloc_arrays.c
View File

@ -18,6 +18,7 @@ struct core_reloc_arrays_output {
char b123;
int c1c;
int d00d;
int f01c;
};
struct core_reloc_arrays_substruct {
@ -30,6 +31,7 @@ struct core_reloc_arrays {
char b[2][3][4];
struct core_reloc_arrays_substruct c[3];
struct core_reloc_arrays_substruct d[1][2];
struct core_reloc_arrays_substruct f[][2];
};
#define CORE_READ(dst, src) bpf_core_read(dst, sizeof(*(dst)), src)
@ -40,18 +42,16 @@ int test_core_arrays(void *ctx)
struct core_reloc_arrays *in = (void *)&data.in;
struct core_reloc_arrays_output *out = (void *)&data.out;
/* in->a[2] */
if (CORE_READ(&out->a2, &in->a[2]))
return 1;
/* in->b[1][2][3] */
if (CORE_READ(&out->b123, &in->b[1][2][3]))
return 1;
/* in->c[1].c */
if (CORE_READ(&out->c1c, &in->c[1].c))
return 1;
/* in->d[0][0].d */
if (CORE_READ(&out->d00d, &in->d[0][0].d))
return 1;
if (CORE_READ(&out->f01c, &in->f[0][1].c))
return 1;
return 0;
}