pkeys on POWER: Access rights not reset on execve

[Florian Weimer]

On 06/11/2018 07:23 PM, Ram Pai wrote:
> On Fri, Jun 08, 2018 at 07:53:51AM +0200, Florian Weimer wrote:
>> On 06/08/2018 04:34 AM, Ram Pai wrote:
>>>>
>>>> So the remaining question at this point is whether the Intel
>>>> behavior (default-deny instead of default-allow) is preferable.
>>>
>>> Florian, remind me what behavior needs to fixed?
>>
>> See the other thread.  The Intel register equivalent to the AMR by
>> default disallows access to yet-unallocated keys, so that threads
>> which are created before key allocation do not magically gain access
>> to a key allocated by another thread.
> 
> Are you referring to the thread
> '[PATCH] pkeys: Introduce PKEY_ALLOC_SIGNALINHERIT and change signal semantics'

> Otherwise please point me to the URL of that thread. Sorry and thankx. :)

No, it's this issue:

   <https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/173157.html>

The UAMOR part has been fixed (thanks), but I think processes still 
start out with default-allow AMR.

Thanks,
Florian