[PATCH v2 0/6] powerpc/pkeys: fixes to pkeys

[Florian Weimer]

On 06/14/2018 02:28 AM, Ram Pai wrote:
> Assortment of fixes to pkey.
> 
> Patch 1  makes pkey consumable in multithreaded applications.
> 
> Patch 2  fixes fork behavior to inherit the key attributes.
> 
> Patch 3  A off-by-one bug made one key unusable. Fixes it.
> 
> Patch 4  Execute-only key is preallocated.
> 
> Patch 5  Makes pkey-0 less special.
> 
> Patch 6  Deny by default permissions on all unallocated keys.
> 
> Passes all selftests on powerpc. Also behavior verified to be correct
> by Florian.
> 
> Changelog:
> 
> 	v2: . fixed merge conflict with upstream code.
> 	    . Add patch 6. Makes the behavior consistent
> 	      with that on x86.

(Except signal handling, but I agree with Ram that the POWER behavior is 
the correct one.)

> Ram Pai (6):
>    powerpc/pkeys: Enable all user-allocatable pkeys at init.
>    powerpc/pkeys: Save the pkey registers before fork
>    powerpc/pkeys: fix calculation of total pkeys.
>    powerpc/pkeys: Preallocate execute-only key
>    powerpc/pkeys: make protection key 0 less special
>    powerpc/pkeys: Deny read/write/execute by default

I tested the whole series with the new selftests, with the printamr.c 
program I posted earlier, and the glibc test for pkey_alloc &c.  The 
latter required some test fixes, but now passes as well.  As far as I 
can tell, everything looks good now.

Tested-By: Florian Weimer <fweimer at redhat.com>

Thanks,
Florian