linux-kernel - Re: [RFC 2/5] livepatch: Basic API to track system state changes

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Date:   Mon, 24 Jun 2019 11:32:19 +0200
From:   Nicolai Stange <nstange@...e.de>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Nicolai Stange <nstange@...e.de>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 2/5] livepatch: Basic API to track system state changes

Petr Mladek <pmladek@...e.com> writes:

> ---
>  include/linux/livepatch.h | 15 +++++++++
>  kernel/livepatch/Makefile |  2 +-
>  kernel/livepatch/state.c  | 83 +++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 99 insertions(+), 1 deletion(-)
>  create mode 100644 kernel/livepatch/state.c
>
> diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
> index eeba421cc671..591abdee30d7 100644
> --- a/include/linux/livepatch.h
> +++ b/include/linux/livepatch.h
> @@ -132,10 +132,21 @@ struct klp_object {
>  	bool patched;
>  };
>  
> +/**
> + * struct klp_state - state of the system modified by the livepatch
> + * @id:		system state identifier (non zero)
> + * @data:	custom data
> + */
> +struct klp_state {
> +	int id;

Can we make this an unsigned long please? It would be consistent with
shadow variable ids and would give more room for encoding bugzilla or
CVE numbers or so.

Nicolai

> +	void *data;
> +};
> +