[PATCH v4a 8/8] module: replace the existing LSM hook in init_module

Kees Cook keescook at chromium.org
Tue Jun 5 15:26:32 PDT 2018


On Tue, Jun 5, 2018 at 2:35 PM, Mimi Zohar <zohar at linux.vnet.ibm.com> wrote:
> On Tue, 2018-06-05 at 12:45 -0700, Kees Cook wrote:
>
>> And if you must have a separate enum, please change this to fail
>> closed instead of open (and mark the fall-through):
>>
>> int rc = -EPERM;
>>
>> switch (id) {
>> case LOADING_MODULE:
>>     rc = loadpin_read_file(NULL, READING_MODULE);
>>     /* Fall-through */
>> default:
>>     break;
>> }
>
> This will fail the sysfs firmware fallback loading and the kexec_load
> syscall without any message, as you have for init_module.  Is that
> what you want?

I'd prefer there be a full mapping of the enums so that everything
gets passed into loadpin_read_file() :)

Can the enum be shared or is that nonsensical?

-Kees

-- 
Kees Cook
Pixel Security



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