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

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Message-ID: <20160429162320.swgc4emtok4euo3t@treble>
Date:	Fri, 29 Apr 2016 11:23:20 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Miroslav Benes <mbenes@...e.cz>
Cc:	jeyu@...hat.com, jikos@...nel.org, pmladek@...e.com,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] klp: make object/func-walking helpers more robust

On Thu, Apr 28, 2016 at 04:34:08PM +0200, Miroslav Benes wrote:
> 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: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh