[PATCH v2] smackfs: restrict bytes count in smackfs write functions

[Casey Schaufler]

On 2/2/2021 11:13 AM, Sabyrzhan Tasbolatov wrote:
>> if PAGE_SIZE >= SMK_LOADSIZE all legitimate requests can be made
>> using PAGE_SIZE as a limit. Your example with 19990 spaces before
>> the data demonstrates that the interface is inadequately documented.
>> Tizen and Automotive Grade Linux are going to be fine with a PAGE_SIZE
>> limit. The best way to address this concern is to go ahead with the
>> PAGE_SIZE limit and create ABI documents for the smackfs interfaces.
>> I will take your patch for the former and create a patch for the latter.
> Please let me know if there is anything else required for this patch.
> AFAIU, we agreed with PAGE_SIZE as the limit.

I am in the process of adding your patch to smack-next for 5.12.

I will have a separate documentation patch.