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selftests/bpf: check that modifier resolves after pointer 

Add a regression test that ensures that a VAR pointing at a
modifier which follows a PTR (or STRUCT or ARRAY) is resolved
correctly by the datasec validator.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Link: https://lore.kernel.org/r/20230306112138.155352-3-lmb@isovalent.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Lorenz Bauer 2023-03-06 11:21:38 +00:00 committed by Martin KaFai Lau
parent 9b459804ff
commit dfdd608c3b
1 changed files with 28 additions and 0 deletions
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28
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -879,6 +879,34 @@ static struct btf_raw_test raw_tests[] = {
.btf_load_err = true,
.err_str = "Invalid elem",
},
{
.descr = "var after datasec, ptr followed by modifier",
.raw_types = {
/* .bss section */ /* [1] */
BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_DATASEC, 0, 2),
sizeof(void*)+4),
BTF_VAR_SECINFO_ENC(4, 0, sizeof(void*)),
BTF_VAR_SECINFO_ENC(6, sizeof(void*), 4),
/* int */ /* [2] */
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4),
/* int* */ /* [3] */
BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_PTR, 0, 0), 2),
BTF_VAR_ENC(NAME_TBD, 3, 0), /* [4] */
/* const int */ /* [5] */
BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_CONST, 0, 0), 2),
BTF_VAR_ENC(NAME_TBD, 5, 0), /* [6] */
BTF_END_RAW,
},
.str_sec = "\0a\0b\0c\0",
.str_sec_size = sizeof("\0a\0b\0c\0"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = ".bss",
.key_size = sizeof(int),
.value_size = sizeof(void*)+4,
.key_type_id = 0,
.value_type_id = 1,
.max_entries = 1,
},
/* Test member exceeds the size of struct.
*
* struct A {