Re: mm, x86, powerpc: pkey semantics for key-0 ?

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To: Ram Pai <linuxram@xxxxxxxxxx>
Subject: Re: mm, x86, powerpc: pkey semantics for key-0 ?
From: Dave Hansen <dave.hansen@xxxxxxxxx>
Date: Thu, 8 Mar 2018 11:30:29 -0800
Cc: mpe@xxxxxxxxxxxxxx, mingo@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, x86@xxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, paulus@xxxxxxxxx, khandual@xxxxxxxxxxxxxxxxxx, aneesh.kumar@xxxxxxxxxxxxxxxxxx, bsingharora@xxxxxxxxx, hbabu@xxxxxxxxxx, mhocko@xxxxxxxxxx, bauerman@xxxxxxxxxxxxxxxxxx, ebiederm@xxxxxxxxxxxx, corbet@xxxxxxx, arnd@xxxxxxxx, fweimer@xxxxxxxxxx, msuchanek@xxxxxxxx, Ulrich.Weigand@xxxxxxxxxx
In-reply-to: <20180308182517.GO1060@ram.oc3035372033.ibm.com>
References: <1519257138-23797-1-git-send-email-linuxram@us.ibm.com> <1519257138-23797-4-git-send-email-linuxram@us.ibm.com> <2a7737cf-a5ba-c814-fdc7-45b5cdd47376@intel.com> <20180308182517.GO1060@ram.oc3035372033.ibm.com>
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On 03/08/2018 10:25 AM, Ram Pai wrote:
> Is there a reason why the default key; key-0, is not allowed to be
> explicitly associated with pages using pkey_mprotect()?

No, it's a bug if it is not permitted.  I have a vague recollection of
knowing about this and having a patch.

References:
- [PATCH v12 0/3] mm, x86, powerpc: Enhancements to Memory Protection Keys.
  - From: Ram Pai
- [PATCH v12 3/3] mm, x86, powerpc: display pkey in smaps only if arch supports pkeys
  - From: Ram Pai
- Re: [PATCH v12 3/3] mm, x86, powerpc: display pkey in smaps only if arch supports pkeys
  - From: Dave Hansen
- mm, x86, powerpc: pkey semantics for key-0 ?
  - From: Ram Pai

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