linux-kernel - Re: [RFC PATCH v2 2/6] module: preserve Elf information for livepatch modules

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Date:	Wed, 16 Dec 2015 11:58:53 +0100 (CET)
From:	Miroslav Benes <mbenes@...e.cz>
To:	Jessica Yu <jeyu@...hat.com>
cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Jonathan Corbet <corbet@....net>, linux-api@...r.kernel.org,
	live-patching@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH v2 2/6] module: preserve Elf information for livepatch
 modules

On Mon, 30 Nov 2015, Jessica Yu wrote:

> @@ -3530,6 +3614,16 @@ static int load_module(struct load_info *info, const char __user *uargs,
>  	if (err < 0)
>  		goto bug_cleanup;
>  
> +	/*
> +	 * Save sechdrs, indices, and other data from info
> +	 * in order to patch to-be-loaded modules.
> +	 * Do not call free_copy() for livepatch modules.
> +	 */
> +	if (mod->klp)
> +		err = copy_module_elf(mod, info);
> +	if (err < 0)
> +		goto bug_cleanup;
> +

I think goto bug_cleanup is not sufficient. Just before this hunk sysfs is 
created. So in case of error here we should call mod_sysfs_teardown() or 
something before going to bug_cleanup. That is new error label is needed 
before bug_cleanup. Correct?

Miroslav
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