linux-kernel - [PATCH v2 3/3] selftests/binderfs: add test for feature files

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Message-Id: <20210715031805.1725878-3-cmllamas@google.com>
Date:   Thu, 15 Jul 2021 03:18:05 +0000
From:   Carlos Llamas <cmllamas@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Arve Hjønnevåg" <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Christian Brauner <christian@...uner.io>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Steven Moreland <smoreland@...gle.com>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        Carlos Llamas <cmllamas@...gle.com>
Subject: [PATCH v2 3/3] selftests/binderfs: add test for feature files

Verify that feature files are created successfully after mounting a
binderfs instance. Note that only "oneway_spam_detection" feature is
tested with this patch as it is currently the only feature listed.

Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
---
 .../filesystems/binderfs/binderfs_test.c        | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
index 477cbb042f5b..0315955ff0f4 100644
--- a/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
+++ b/tools/testing/selftests/filesystems/binderfs/binderfs_test.c
@@ -62,6 +62,9 @@ static int __do_binderfs_test(struct __test_metadata *_metadata)
 	struct binder_version version = { 0 };
 	char binderfs_mntpt[] = P_tmpdir "/binderfs_XXXXXX",
 		device_path[sizeof(P_tmpdir "/binderfs_XXXXXX/") + BINDERFS_MAX_NAME];
+	static const char * const binder_features[] = {
+		"oneway_spam_detection",
+	};
 
 	change_mountns(_metadata);
 
@@ -150,6 +153,20 @@ static int __do_binderfs_test(struct __test_metadata *_metadata)
 	}
 
 	/* success: binder-control device removal failed as expected */
+
+	for (int i = 0; i < ARRAY_SIZE(binder_features); i++) {
+		snprintf(device_path, sizeof(device_path), "%s/features/%s",
+			 binderfs_mntpt, binder_features[i]);
+		fd = open(device_path, O_CLOEXEC | O_RDONLY);
+		EXPECT_GE(fd, 0) {
+			TH_LOG("%s - Failed to open binder feature: %s",
+				strerror(errno), binder_features[i]);
+			goto umount;
+		}
+		close(fd);
+	}
+
+	/* success: binder feature files found */
 	result = 0;
 
 umount:
-- 
2.32.0.93.g670b81a890-goog