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selftests/bpf: Test duplicate bpf_refcount fields

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Add a raw BTF test with two bpf_refcount fields. The duplicate must be
rejected during BTF loading instead of reaching the duplicate-field
invariant in btf_parse_fields().

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://patch.msgid.link/20260719153634.2908692-6-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
This commit is contained in:
Kumar Kartikeya Dwivedi 2026-07-19 17:36:32 +02:00 committed by Eduard Zingerman
parent 9f2afb635c
commit 643bd5af85
1 changed files with 21 additions and 0 deletions
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21
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -4277,6 +4277,27 @@ static struct btf_raw_test raw_tests[] = {
.btf_load_err = true,
},
/*
* struct value {
* struct bpf_refcount a;
* struct bpf_refcount b;
* };
*/
{
.descr = "struct test duplicate bpf_refcount fields",
.raw_types = {
BTF_TYPE_INT_ENC(NAME_TBD, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_STRUCT_ENC(NAME_TBD, 1, 4), /* [2] */
BTF_MEMBER_ENC(NAME_TBD, 1, 0),
BTF_STRUCT_ENC(NAME_TBD, 2, 8), /* [3] */
BTF_MEMBER_ENC(NAME_TBD, 2, 0),
BTF_MEMBER_ENC(NAME_TBD, 2, 32),
BTF_END_RAW,
},
BTF_STR_SEC("\0int\0bpf_refcount\0refs\0value\0a\0b"),
.btf_load_err = true,
},
{
.descr = "struct test repeated fields count overflow",
.raw_types = {