[PATCH] block: Check ADMIN before NICE for IOPRIO_CLASS_RT

[Jens Axboe]

On 11/15/21 10:38 AM, Alistair Delva wrote:
> Booting to Android userspace on 5.14 or newer triggers the following
> SELinux denial:
> 
> avc: denied { sys_nice } for comm="init" capability=23
>      scontext=u:r:init:s0 tcontext=u:r:init:s0 tclass=capability
>      permissive=0
> 
> Init is PID 0 running as root, so it already has CAP_SYS_ADMIN. For
> better compatibility with older SEPolicy, check ADMIN before NICE.

Seems a bit wonky to me, but the end result is the same. In any case,
this warrants a comment above it detailing why the ordering is
seemingly important.

-- 
Jens Axboe