Re: [PATCH] x86, powerpc : pkey-mprotect must allow pkey-0
From: Dave Hansen <hidden>
Date: 2018-03-09 22:40:39
Also in:
linux-arch, linux-mm, lkml
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? 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.