Messages in this thread | | | Date | Fri, 9 Mar 2018 12:06:31 -0800 | From | Ram Pai <> | Subject | Re: [PATCH] x86, powerpc : pkey-mprotect must allow pkey-0 |
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On Fri, Mar 09, 2018 at 09:19:53PM +1100, Michael Ellerman wrote: > Ram Pai <linuxram@us.ibm.com> writes: > > > Once an address range is associated with an allocated pkey, it cannot be > > reverted back to key-0. There is no valid reason for the above behavior. On > > the contrary applications need the ability to do so. > > Please explain this in much more detail. Is it an ABI change?
Not necessarily an ABI change. older binary applications will continue to work. It can be considered as a bug-fix.
> > And why did we just notice this?
Yes. this was noticed by an application vendor.
> > > The patch relaxes the restriction. > > > > Tested on powerpc and x86_64. > > Thanks, but please split the patch, one for each arch.
Will do. RP
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