linux-ext4 - [PATCH v2 07/10] syscalls/fanotify20: Create a corrupted file

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Date:   Tue, 26 Oct 2021 15:42:36 -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 07/10] syscalls/fanotify20: Create a corrupted file

Allocate a test directory and corrupt it with debugfs.  The corruption
is done by writing an invalid inode mode.  This file can be later
looked up to trigger a corruption error.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 testcases/kernel/syscalls/fanotify/fanotify20.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
index 7c4b01720654..298bb303a810 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify20.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
@@ -43,9 +43,12 @@ static char event_buf[BUF_SIZE];
 int fd_notify;
 
 #define MOUNT_PATH "test_mnt"
+#define BASE_DIR "internal_dir"
+#define BAD_DIR BASE_DIR"/bad_dir"
 
 /* These expected FIDs are common to multiple tests */
 static struct fanotify_fid_t null_fid;
+static struct fanotify_fid_t bad_file_fid;
 
 static void do_debugfs_request(const char *dev, char *request)
 {
@@ -182,6 +185,18 @@ static void do_test(unsigned int i)
 	check_event(event_buf, read_len, tcase);
 }
 
+static void pre_corrupt_fs(void)
+{
+	SAFE_MKDIR(MOUNT_PATH"/"BASE_DIR, 0777);
+	SAFE_MKDIR(MOUNT_PATH"/"BAD_DIR, 0777);
+
+	fanotify_save_fid(MOUNT_PATH"/"BAD_DIR, &bad_file_fid);
+
+	SAFE_UMOUNT(MOUNT_PATH);
+	do_debugfs_request(tst_device->dev, "sif " BAD_DIR " mode 0xff");
+	SAFE_MOUNT(tst_device->dev, MOUNT_PATH, tst_device->fs_type, 0, NULL);
+}
+
 static void init_null_fid(void)
 {
 	/* Use fanotify_save_fid to fill the fsid and overwrite the
@@ -201,6 +216,8 @@ static void setup(void)
 
 	init_null_fid();
 
+	pre_corrupt_fs();
+
 	fd_notify = SAFE_FANOTIFY_INIT(FAN_CLASS_NOTIF|FAN_REPORT_FID,
 				       O_RDONLY);
 
-- 
2.33.0