linux-kernel - Re: klp: make object/func-walking helpers more robust

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Message-ID: <20160429162649.GB30409@packer-debian-8-amd64.digitalocean.com>
Date:	Fri, 29 Apr 2016 12:26:49 -0400
From:	Jessica Yu <jeyu@...hat.com>
To:	Miroslav Benes <mbenes@...e.cz>
Cc:	jpoimboe@...hat.com, jikos@...nel.org, pmladek@...e.com,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: klp: make object/func-walking helpers more robust

+++ Miroslav Benes [28/04/16 16:34 +0200]:
>Current object-walking helper checks the presence of obj->funcs to
>determine the end of objs array in klp_object structure. This is
>somewhat fragile because one can easily forget about funcs definition
>during livepatch creation. In such a case the livepatch module is
>successfully loaded and all objects after the incorrect one are omitted.
>This is very confusing. Let's make the helper more robust and check also
>for the other external member, name. Thus the helper correctly stops on
>an empty item of the array. We need to have a check for obj->funcs in
>klp_init_object() to make it work.
>
>The same applies to a func-walking helper.
>
>As a benefit we'll check for new_func member definition during the
>livepatch initialization. There is no such check anywhere in the code
>now.
>
>Signed-off-by: Miroslav Benes <mbenes@...e.cz>

Acked-by: Jessica Yu <jeyu@...hat.com>