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

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  Re: [RFC PATCH v2 2/6] module: preserve Elf information for livepatch  modules Miroslav Benes <mbenes@suse.cz> - 2015-12-16 12:00 +0100
    Re: module: preserve Elf information for livepatch modules Jessica Yu <jeyu@redhat.com> - 2015-12-17 02:10 +0100

#1292895 — 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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#1293514 — Re: module: preserve Elf information for livepatch modules

+++ Miroslav Benes [16/12/15 11:58 +0100]:
>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?

Yes I think you're right. So before bug_cleanup, we'll just need a new
label (maybe called sysfs_cleanup) that calls mod_sysfs_teardown(). In
addition, the if (err < 0) check should have been enclosed in the if
(mod->klp) block.

Jessica
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