Messages in this thread | | | Date | Fri, 9 Mar 2018 21:55:44 -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 02:40:32PM -0800, Dave Hansen wrote: > On 03/09/2018 12:12 AM, Ram Pai wrote: > > 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. > > Why don't we just set pkey 0 to be allocated in the allocation bitmap by > default?
ok. that will make it allocatable. But it will not be associatable, given the bug in the current code. And what will be the default key associated with a pte? zero? or something else?
> > We *could* also just not let it be special and let it be freed. An app > could theoretically be careful and make sure nothing is using it.
unable to see how this solves the problem. Need some more explaination.
RP
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