linux-ext4 - [PATCH v2 09/10] syscalls/fanotify20: Test file event with broken inode

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Date:   Tue, 26 Oct 2021 15:42:38 -0300
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     ltp@...ts.linux.it, jack@...e.com, amir73il@...il.com
Cc:     khazhy@...gle.com, kernel@...labora.com,
        linux-ext4@...r.kernel.org, repnop@...gle.com,
        Gabriel Krisman Bertazi <krisman@...labora.com>
Subject: [PATCH v2 09/10] syscalls/fanotify20: Test file event with broken inode

This test corrupts an inode entry with an invalid mode through debugfs
and then tries to access it.  This should result in a ext4 error, which
we monitor through the fanotify group.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 .../kernel/syscalls/fanotify/fanotify20.c     | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
index 5c5ee3c6fb74..7bcddcaa98cb 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify20.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
@@ -38,6 +38,10 @@
 #define	FILEID_INVALID		0xff
 #endif
 
+#ifndef EFSCORRUPTED
+#define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
+#endif
+
 #define BUF_SIZE 256
 static char event_buf[BUF_SIZE];
 int fd_notify;
@@ -63,6 +67,17 @@ static void trigger_fs_abort(void)
 		   MS_REMOUNT|MS_RDONLY, "abort");
 }
 
+static void tcase2_trigger_lookup(void)
+{
+	int ret;
+
+	/* SAFE_OPEN cannot be used here because we expect it to fail. */
+	ret = open(MOUNT_PATH"/"BAD_DIR, O_RDONLY, 0);
+	if (ret != -1 && errno != EUCLEAN)
+		tst_res(TFAIL, "Unexpected lookup result(%d) of %s (%d!=%d)",
+			ret, BAD_DIR, errno, EUCLEAN);
+}
+
 static struct test_case {
 	char *name;
 	int error;
@@ -77,6 +92,13 @@ static struct test_case {
 		.error = ESHUTDOWN,
 		.fid = &null_fid,
 	},
+	{
+		.name = "Lookup of inode with invalid mode",
+		.trigger_error = &tcase2_trigger_lookup,
+		.error_count = 1,
+		.error = EFSCORRUPTED,
+		.fid = &bad_file_fid,
+	},
 };
 
 int check_error_event_info_fid(struct fanotify_event_info_fid *fid,
-- 
2.33.0