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selftests/bpf: Add reproducer for decl_tag in func_proto return type

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It should trigger a WARN_ON_ONCE in btf_type_id_size.

     btf_func_proto_check kernel/bpf/btf.c:4447 [inline]
     btf_check_all_types kernel/bpf/btf.c:4723 [inline]
     btf_parse_type_sec kernel/bpf/btf.c:4752 [inline]
     btf_parse kernel/bpf/btf.c:5026 [inline]
     btf_new_fd+0x1926/0x1e70 kernel/bpf/btf.c:6892
     bpf_btf_load kernel/bpf/syscall.c:4324 [inline]
     __sys_bpf+0xb7d/0x4cf0 kernel/bpf/syscall.c:5010
     __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
     __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
     __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5067
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x63/0xcd

Cc: Yonghong Song <yhs@fb.com>
Cc: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221015002444.2680969-1-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Stanislav Fomichev 2022-10-14 17:24:43 -07:00 committed by Martin KaFai Lau
parent e7b0935745
commit 35cc9d622e
1 changed files with 13 additions and 0 deletions
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13
tools/testing/selftests/bpf/prog_tests/btf.c
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@ -3935,6 +3935,19 @@ static struct btf_raw_test raw_tests[] = {
.btf_load_err = true,
.err_str = "Invalid type_id",
},
{
.descr = "decl_tag test #16, func proto, return type",
.raw_types = {
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
BTF_VAR_ENC(NAME_TBD, 1, 0), /* [2] */
BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_DECL_TAG, 0, 0), 2), (-1), /* [3] */
BTF_FUNC_PROTO_ENC(3, 0), /* [4] */
BTF_END_RAW,
},
BTF_STR_SEC("\0local\0tag1"),
.btf_load_err = true,
.err_str = "Invalid return type",
},
{
.descr = "type_tag test #1",
.raw_types = {