[linux-audio-dev] Re: POSIX caps/realtime/root processes

[Kjetil Svalastog Matheussen]

Paul Davis:
> >Since mainstream capabilities support seems always to be somewhere
> >over the horizon, I am interested in the patch Paul and Steve
> >mentioned.  IIUC, it defines a control file in /proc which, if
> >enabled, allows any process access to scheduling and memory locking
> >privileges.  No other capabilities are provided.  I would love to see
> >a copy of this patch to study exactly what it does.
>
> its a very simple patch, IIRC. it just short-circuits the checks on
> uid==0 and/or capabilities when assigning SCHED_FIFO and/or locking
> memory.
>
> i'm looking for it in my archives. i'm a bit worried i may have

I couldn't wait til you found it, so I wrote one from scratch instead. :)
The url below point to a hackish patch againt 2.4.23-rc1, and yes, it is
very simple. Works by setting /proc/sys/kernel/setschedandmlock to 1.
http://www.notam02.no/arkiv/src/schedmlockpatch-2.4.23-rc1




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