[PATCH v17 06/12] bpf: Add bpf_lookup_*_key() and bpf_key_put() kfuncs

[Song Liu]

On Fri, Sep 9, 2022 at 1:09 PM 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>
> Acked-by: Kumar Kartikeya Dwivedi <memxor at gmail.com>

Acked-by: Song Liu <song at kernel.org>

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