pkeys on POWER: Access rights not reset on execve

[Florian Weimer]

On 05/20/2018 09:11 PM, Ram Pai wrote:
> Florian,
> 
> 	Does the following patch fix the problem for you?  Just like x86
> 	I am enabling all keys in the UAMOR register during
> 	initialization itself. Hence any key created by any thread at
> 	any time, will get activated on all threads. So any thread
> 	can change the permission on that key. Smoke tested it
> 	with your test program.

I think this goes in the right direction, but the AMR value after fork 
is still strange:

AMR (PID 34912): 0x0000000000000000
AMR after fork (PID 34913): 0x0000000000000000
AMR (PID 34913): 0x0000000000000000
Allocated key in subprocess (PID 34913): 2
Allocated key (PID 34912): 2
Setting AMR: 0xffffffffffffffff
New AMR value (PID 34912): 0x0fffffffffffffff
About to call execl (PID 34912) ...
AMR (PID 34912): 0x0fffffffffffffff
AMR after fork (PID 34914): 0x0000000000000003
AMR (PID 34914): 0x0000000000000003
Allocated key in subprocess (PID 34914): 2
Allocated key (PID 34912): 2
Setting AMR: 0xffffffffffffffff
New AMR value (PID 34912): 0x0fffffffffffffff

I mean this line:

AMR after fork (PID 34914): 0x0000000000000003

Shouldn't it be the same as in the parent process?

Thanks,
Florian