apparmor: fix policy_unpack_test on big endian systems

policy_unpack_test fails on big endian systems because data byte order
is expected to be little endian but is generated in host byte order.
This results in test failures such as:

 # policy_unpack_test_unpack_array_with_null_name: EXPECTATION FAILED at security/apparmor/policy_unpack_test.c:150
    Expected array_size == (u16)16, but
        array_size == 4096 (0x1000)
        (u16)16 == 16 (0x10)
    # policy_unpack_test_unpack_array_with_null_name: pass:0 fail:1 skip:0 total:1
    not ok 3 policy_unpack_test_unpack_array_with_null_name
    # policy_unpack_test_unpack_array_with_name: EXPECTATION FAILED at security/apparmor/policy_unpack_test.c:164
    Expected array_size == (u16)16, but
        array_size == 4096 (0x1000)
        (u16)16 == 16 (0x10)
    # policy_unpack_test_unpack_array_with_name: pass:0 fail:1 skip:0 total:1

Add the missing endianness conversions when generating test data.

Fixes: 4d944bcd ("apparmor: add AppArmor KUnit tests for policy unpack")
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

security/apparmor/policy_unpack_test.c

@@ -80,14 +80,14 @@ static struct aa_ext *build_aa_ext_struct(struct policy_unpack_fixture *puf,
 	*(buf + 1) = strlen(TEST_U32_NAME) + 1;
 	strscpy(buf + 3, TEST_U32_NAME, e->end - (void *)(buf + 3));
 	*(buf + 3 + strlen(TEST_U32_NAME) + 1) = AA_U32;
-	*((u32 *)(buf + 3 + strlen(TEST_U32_NAME) + 2)) = TEST_U32_DATA;
+	*((__le32 *)(buf + 3 + strlen(TEST_U32_NAME) + 2)) = cpu_to_le32(TEST_U32_DATA);
 
 	buf = e->start + TEST_NAMED_U64_BUF_OFFSET;
 	*buf = AA_NAME;
 	*(buf + 1) = strlen(TEST_U64_NAME) + 1;
 	strscpy(buf + 3, TEST_U64_NAME, e->end - (void *)(buf + 3));
 	*(buf + 3 + strlen(TEST_U64_NAME) + 1) = AA_U64;
-	*((u64 *)(buf + 3 + strlen(TEST_U64_NAME) + 2)) = TEST_U64_DATA;
+	*((__le64 *)(buf + 3 + strlen(TEST_U64_NAME) + 2)) = cpu_to_le64(TEST_U64_DATA);
 
 	buf = e->start + TEST_NAMED_BLOB_BUF_OFFSET;
 	*buf = AA_NAME;
@@ -103,7 +103,7 @@ static struct aa_ext *build_aa_ext_struct(struct policy_unpack_fixture *puf,
 	*(buf + 1) = strlen(TEST_ARRAY_NAME) + 1;
 	strscpy(buf + 3, TEST_ARRAY_NAME, e->end - (void *)(buf + 3));
 	*(buf + 3 + strlen(TEST_ARRAY_NAME) + 1) = AA_ARRAY;
-	*((u16 *)(buf + 3 + strlen(TEST_ARRAY_NAME) + 2)) = TEST_ARRAY_SIZE;
+	*((__le16 *)(buf + 3 + strlen(TEST_ARRAY_NAME) + 2)) = cpu_to_le16(TEST_ARRAY_SIZE);
 
 	return e;
 }