[PATCH v13 05/10] bpf: Add bpf_lookup_*_key() and bpf_key_put() kfuncs

[Roberto Sassu]

On Thu, 2022-08-25 at 22:56 -0700, Song Liu wrote:
> On Tue, Aug 23, 2022 at 8:02 AM Roberto Sassu
> <roberto.sassu at huaweicloud.com> wrote:
> > From: Roberto Sassu <roberto.sassu at huawei.com>
> > 
> > Add the bpf_lookup_user_key(), bpf_lookup_system_key() and
> > bpf_key_put()
> > kfuncs, to respectively search a key with a given key handle serial
> > number
> > and flags, obtain a key from a pre-determined ID defined in
> > include/linux/verification.h, and cleanup.
> > 
> > Introduce system_keyring_id_check() to validate the keyring ID
> > parameter of
> > bpf_lookup_system_key().
> > 
> > Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>
> > ---
> >  include/linux/bpf.h          |   6 ++
> >  include/linux/verification.h |   8 +++
> >  kernel/trace/bpf_trace.c     | 135
> > +++++++++++++++++++++++++++++++++++
> >  3 files changed, 149 insertions(+)
> > 
> > diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> > index 6041304b402e..991da09a5858 100644
> > --- a/include/linux/bpf.h
> > +++ b/include/linux/bpf.h
> > @@ -2586,4 +2586,10 @@ static inline void bpf_cgroup_atype_get(u32
> > attach_btf_id, int cgroup_atype) {}
> >  static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
> >  #endif /* CONFIG_BPF_LSM */
> > 
> > +#ifdef CONFIG_KEYS
> 
> Do we need to declare struct key here?
> 
> > +struct bpf_key {
> > +       struct key *key;
> > +       bool has_ref;
> > +};
> > +#endif /* CONFIG_KEYS */
> >  #endif /* _LINUX_BPF_H */
> > 

If there is a better place, I will move there.

Thanks

Roberto