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selftests/bpf: Add a selftest for invalid func btf with btf decl_tag 

Added a selftest similar to [1] which exposed a kernel bug.
Without the fix in the previous patch, the similar kasan error will appear.

  [1] https://lore.kernel.org/bpf/0000000000009b6eaa05d71a8c06@google.com/

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220203191732.742285-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2022-02-03 11:17:32 -08:00 committed by Alexei Starovoitov
parent d7e7b42f4f
commit cf1a4cbce6
1 changed files with 19 additions and 0 deletions
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19
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -3938,6 +3938,25 @@ static struct btf_raw_test raw_tests[] = {
.btf_load_err = true,
.err_str = "Invalid component_idx",
},
{
.descr = "decl_tag test #15, func, invalid func proto",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_DECL_TAG_ENC(NAME_TBD, 3, 0), /* [2] */
BTF_FUNC_ENC(NAME_TBD, 8), /* [3] */
BTF_END_RAW,
},
BTF_STR_SEC("\0tag\0func"),
.map_type = BPF_MAP_TYPE_ARRAY,
.map_name = "tag_type_check_btf",
.key_size = sizeof(int),
.value_size = 4,
.key_type_id = 1,
.value_type_id = 1,
.max_entries = 1,
.btf_load_err = true,
.err_str = "Invalid type_id",
},
{
.descr = "type_tag test #1",
.raw_types = {