On Tue, Oct 26, 2021 at 9:44 PM Gabriel Krisman Bertazi
<krisman@xxxxxxxxxxxxx> wrote:
>
> 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@xxxxxxxxxxxxx>
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
> ---
> 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
>
