# \[PATCH 6/7\] lkdtm: crash on overwriting protected pmalloc var

- From: J Freyensee \<hidden\>
- Date: 2018-03-07 17:27:02 
- List: linux-security-module
- Page: https://ratatoskr.run/linux-security-module/2018/03/5232154
- Thread: https://ratatoskr.run/linux-security-module/2018/02/5193835/t.md

```text


On 3/7/18 5:18 AM, Igor Stoppa wrote:
>
> On 06/03/18 19:20, J Freyensee wrote:
>
>> On 2/28/18 12:06 PM, Igor Stoppa wrote:
> [...]
>
>>>    void __init lkdtm_perms_init(void);
>>>    void lkdtm_WRITE_RO(void);
>>>    void lkdtm_WRITE_RO_AFTER_INIT(void);
>>> +void lkdtm_WRITE_RO_PMALLOC(void);
>> Does this need some sort of #ifdef too?
> Not strictly. It's just a function declaration.
> As long as it is not used, the linker will not complain.
> The #ifdef placed around the use and definition is sufficient, from a
> correctness perspective.
>
> But it's a different question if there is any standard in linux about
> hiding also the declaration.


I'd prefer hiding it if it's contents are being ifdef'ed out, but I 
really think it's more of a maintainer preference question.


>
> I am not very fond of #ifdefs, so when I can I try to avoid them.
>
>


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```