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

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Date:   Wed, 27 Oct 2021 09:51:10 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     LTP List <ltp@...ts.linux.it>, Jan Kara <jack@...e.com>,
        Khazhismel Kumykov <khazhy@...gle.com>, kernel@...labora.com,
        Ext4 <linux-ext4@...r.kernel.org>,
        Matthew Bobrowski <repnop@...gle.com>
Subject: Re: [PATCH v2 07/10] syscalls/fanotify20: Create a corrupted file

On Tue, Oct 26, 2021 at 9:44 PM Gabriel Krisman Bertazi
<krisman@...labora.com> 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@...labora.com>

Reviewed-by: Amir Goldstein <amir73il@...il.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
>