[LTP] [PATCH 1/1] fanotify10: Treat ignore mask bug as TCONF for < v5.9

[Petr Vorel <pvorel@suse.cz>]

Hi Amir,

> > Suggested-by: Amir Goldstein <amir73il@gmail.com>
> > Signed-off-by: Petr Vorel <pvorel@suse.cz>
> > ---
> > Hi Amir,

> > based on suggestion http://lists.linux.it/pipermail/ltp/2020-September/018891.html,
> > but not really sure if it should be applied, because we loose warning:

> > HINT: You _MAY_ be missing kernel fixes, see:

> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bdda4e9cf2d
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f02fd3fa13e
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=497b0c5a7c06


> I think your change is fine, because this warning would only send poor
> stable kernel maintainers on a quest to find a patch to backport, which IMO
> is not going to end with a fix.

> The situation with ignored mask logic is that it was broken or not properly
> defined from day 1 of fanotify, so people are probably using ignored mask
> only in the very basic combinations.

> Lately, along with FAN_MARK_FILESYSTEM and related work, more
> opportunities for using ignored mask have materialized and many old bugs
> have surfaced.

> But I'm afraid it will not be feasible to backport all the fixes, so
> once the ignored
> logic settles (there are still several bugs left) I will try to
> properly document
> what is expected to work in which kernel and will update the man page
> BUGS section.
+1, that'd be great. Having tests early and update man page, not many syscalls
have that, thank you.

Kind regards,
Petr

> Jan,

> Please let me know if we are on the same page in that regard.

> Thanks,
> Amir.

> > Kind regards,
> > Petr


> >  testcases/kernel/syscalls/fanotify/fanotify10.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)

> > diff --git a/testcases/kernel/syscalls/fanotify/fanotify10.c b/testcases/kernel/syscalls/fanotify/fanotify10.c
> > index 2c4401f61..5b4591b4a 100644
> > --- a/testcases/kernel/syscalls/fanotify/fanotify10.c
> > +++ b/testcases/kernel/syscalls/fanotify/fanotify10.c
> > @@ -508,8 +508,8 @@ static void test_fanotify(unsigned int n)
> >                                         "zero length read from fanotify fd");
> >                         }
> >                         if (ret > 0) {
> > -                               tst_res(TFAIL, "group %d (%x) with %s and "
> > -                                       "%s ignore mask got event",
> > +                               tst_res((tst_kvercmp(5, 9, 0)) < 0 ? TCONF : TFAIL,
> > +                                       "group %d (%x) with %s and %s ignore mask got event",
> >                                         i, fanotify_class[p], mark->name, ignore_mark->name);
> >                                 if (event->fd != FAN_NOFD)
> >                                         SAFE_CLOSE(event->fd);
> > --
> > 2.28.0