[LTP] [PATCH] fanotify14: Test disallow sb/mount mark on anonymous pipe

[Petr Vorel]

Hi Amir,

> This case was retroactively disallowed.

> This test is meant to encourage the backporting of commit 69562eb0bd3e
> ("fanotify: disallow mount/sb marks on kernel internal pseudo fs") to
> all stable kernels.

> Signed-off-by: Amir Goldstein <amir73il@gmail.com>
> ---

> Petr,

> This tests for a behavior that we consider broken since the dawn of
> fanotify.

> The fix was merged to v6.5-rc1.
> I've already posted backport patches for kernels > v5.0.
> I am not planning to post backport patches for older kernels.

I see
https://lore.kernel.org/stable/20230710133205.1154168-1-amir73il@gmail.com/

I'll suggest to wait till Greg releases the backport (should be quick enough).

> Even though the two new test cases do not use FAN_REPORT_FID,
> fanotify14 requires FAN_REPORT_FID, so it is not going to run these
> test cases on kernel < v5.1 anyway.

> Thanks,
> Amir.

>  .../kernel/syscalls/fanotify/fanotify14.c     | 32 +++++++++++++++++--
>  1 file changed, 30 insertions(+), 2 deletions(-)

> diff --git a/testcases/kernel/syscalls/fanotify/fanotify14.c b/testcases/kernel/syscalls/fanotify/fanotify14.c
> index bfa0349fe..063a9f96f 100644
> --- a/testcases/kernel/syscalls/fanotify/fanotify14.c
> +++ b/testcases/kernel/syscalls/fanotify/fanotify14.c
> @@ -19,6 +19,9 @@
>   *
>   *     ceaf69f8eadc fanotify: do not allow setting dirent events in mask of non-dir
>   *     8698e3bab4dd fanotify: refine the validation checks on non-dir inode mask
> + *
> + * The pipes test cases are regression tests for commit:
> + *     69562eb0bd3e fanotify: disallow mount/sb marks on kernel internal pseudo fs
>   */

>  #define _GNU_SOURCE
> @@ -40,6 +43,7 @@

>  #define FLAGS_DESC(flags) {(flags), (#flags)}

> +static int pipes[2] = {-1, -1};
>  static int fanotify_fd;
>  static int fan_report_target_fid_unsupported;
>  static int ignore_mark_unsupported;
> @@ -60,6 +64,7 @@ static struct test_case_t {
>  	/* when mask.flags == 0, fanotify_init() is expected to fail */
>  	struct test_case_flags_t mask;
>  	int expected_errno;
> +	int *pfd;

This produces warnings:
fanotify14.c:70:9: warning: missing initializer for field ‘pfd’ of ‘struct test_case_t’ [-Wmissing-field-initializers]
   70 |         {FLAGS_DESC(FAN_CLASS_CONTENT | FAN_REPORT_FID), {}, {}, EINVAL},
      |         ^
fanotify14.c:67:14: note: ‘pfd’ declared here
   67 |         int *pfd;
      |              ^~~
fanotify14.c:73:9: warning: missing initializer for field ‘pfd’ of ‘struct test_case_t’ [-Wmissing-field-initializers]
   73 |         {FLAGS_DESC(FAN_CLASS_PRE_CONTENT | FAN_REPORT_FID), {}, {}, EINVAL},
      |         ^
fanotify14.c:67:14: note: ‘pfd’ declared here
   67 |         int *pfd;
      |              ^~~

Could you please fix them? I guess pfd must be NULL when unused.

The rest LGTM.

Kind regards,
Petr

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