[PATCH bpf-next v2 2/2] selftests/bpf: Dump unaligned enums and a zeroed fs_context

[Hungyu Lin <dennylin0707@gmail.com>]

Dump the signed enum value from an unaligned address in the enum data
test. Also dump a zeroed struct fs_context without emit_zeroes in the
struct data test, which covers phase, an enum bitfield 3 bytes before
the end of the struct.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Hungyu Lin <dennylin0707@gmail.com>
---
 tools/testing/selftests/bpf/prog_tests/btf_dump.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dump.c b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
index b5c90f729339..d6fd9933ff25 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf_dump.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
@@ -945,7 +945,7 @@ static void test_btf_dump_enum_data(struct btf *btf, struct btf_dump *d,
 				    char *str)
 {
 	__u32 high = 0x80000000;
-	__s32 neg = -1;
+	__s32 neg[2] = { -1, -1 };
 
 	/* enum where enum value does (and does not) exist */
 	TEST_BTF_DUMP_DATA_C(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT,
@@ -994,6 +994,8 @@ static void test_btf_dump_enum_data(struct btf *btf, struct btf_dump *d,
 				"(enum test_enum_u32)TEST_ENUM_HIGH"), "dump unsigned enum");
 	ASSERT_OK(btf_dump_data(btf, d, "test_enum_s32", NULL, 0, &neg, 4, str,
 				"(enum test_enum_s32)TEST_ENUM_NEG"), "dump signed enum");
+	ASSERT_OK(btf_dump_data(btf, d, "test_enum_s32", NULL, 0, (void *)neg + 1, 4, str,
+				"(enum test_enum_s32)TEST_ENUM_NEG"), "dump unaligned enum");
 	btf_dump__free(d);
 }
 
@@ -1182,6 +1184,12 @@ static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d,
 		type_sz = btf__resolve_size(btf, type_id);
 		str[0] = '\0';
 
+		/* 'phase' is an enum bitfield 3 bytes before the end */
+		ret = btf_dump__dump_type_data(d, type_id, zero_data, type_sz, &opts);
+		ASSERT_EQ(ret, type_sz,
+			  "unexpected return value dumping zeroed fs_context");
+
+		str[0] = '\0';
 		opts.emit_zeroes = true;
 		ret = btf_dump__dump_type_data(d, type_id, zero_data, type_sz, &opts);
 		ASSERT_EQ(ret, type_sz,
-- 
2.43.0