[RFC PATCH v2 2/2] docs: add fail_lsm_hooks info to fault-injection.rst

[Aleksandr Nogikh]

On Tue, Oct 27, 2020 at 6:31 PM Akinobu Mita <akinobu.mita at gmail.com> wrote:
>
[...]
> In addition to this global one, what do you think about per-hook fault
> injection,
> i.e. /sys/kernel/debug/fail_lsm_hooks/<FUNC>/retval ?

I was thinking about this, but decided to begin with a simple version
that could definitely be useful in practice (for syzbot/syzkaller it is just
necessary to have a fault injection capability that will be triggered via
fail-nth). If per-hook fault injection can also be useful to someone, I
can try to add it as well.

> In this case, we need a fault_attr for each hook. (Maybe, we can use the same
> technique that is used to define security_hook_heads).

Yes, that technique should help to implement the feature in a very concise
way. Thanks for the suggestion.