[PATCH bpf-next 4/9] selftests/bpf: add test validating failure on ambiguous relocation value

[Andrii Nakryiko <andriin@xxxxxx>]

Add test simulating ambiguous field size relocation, while fields themselves
are at the exact same offset.

Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
---
 .../selftests/bpf/prog_tests/core_reloc.c     |  1 +
 .../btf__core_reloc_size___err_ambiguous.c    |  4 +++
 .../selftests/bpf/progs/core_reloc_types.h    | 25 +++++++++++++++++++
 3 files changed, 30 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/progs/btf__core_reloc_size___err_ambiguous.c

diff --git a/tools/testing/selftests/bpf/prog_tests/core_reloc.c b/tools/testing/selftests/bpf/prog_tests/core_reloc.c
index a54eafc5e4b3..4d650e99be28 100644
--- a/tools/testing/selftests/bpf/prog_tests/core_reloc.c
+++ b/tools/testing/selftests/bpf/prog_tests/core_reloc.c
@@ -452,6 +452,7 @@ static struct core_reloc_test_case test_cases[] = {
 	/* size relocation checks */
 	SIZE_CASE(size),
 	SIZE_CASE(size___diff_sz),
+	SIZE_ERR_CASE(size___err_ambiguous),
 };
 
 struct data {
diff --git a/tools/testing/selftests/bpf/progs/btf__core_reloc_size___err_ambiguous.c b/tools/testing/selftests/bpf/progs/btf__core_reloc_size___err_ambiguous.c
new file mode 100644
index 000000000000..f3e9904df9c2
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/btf__core_reloc_size___err_ambiguous.c
@@ -0,0 +1,4 @@
+#include "core_reloc_types.h"
+
+void f(struct core_reloc_size___err_ambiguous1 x,
+       struct core_reloc_size___err_ambiguous2 y) {}
diff --git a/tools/testing/selftests/bpf/progs/core_reloc_types.h b/tools/testing/selftests/bpf/progs/core_reloc_types.h
index 69139ed66216..3b1126c0bc8f 100644
--- a/tools/testing/selftests/bpf/progs/core_reloc_types.h
+++ b/tools/testing/selftests/bpf/progs/core_reloc_types.h
@@ -809,3 +809,28 @@ struct core_reloc_size___diff_sz {
 	void *ptr_field;
 	enum { OTHER_VALUE = 0xFFFFFFFFFFFFFFFF } enum_field;
 };
+
+/* Error case of two candidates with the fields (int_field) at the same
+ * offset, but with differing final relocation values: size 4 vs size 1
+ */
+struct core_reloc_size___err_ambiguous1 {
+	/* int at offset 0 */
+	int int_field;
+
+	struct { int x; } struct_field;
+	union { int x; } union_field;
+	int arr_field[4];
+	void *ptr_field;
+	enum { VALUE___1 = 123 } enum_field;
+};
+
+struct core_reloc_size___err_ambiguous2 {
+	/* char at offset 0 */
+	char int_field;
+
+	struct { int x; } struct_field;
+	union { int x; } union_field;
+	int arr_field[4];
+	void *ptr_field;
+	enum { VALUE___2 = 123 } enum_field;
+};
-- 
2.24.1