From: Dave Hansen <dave@sr71.net>
To: mtk.manpages@gmail.com
Cc: Jonathan Corbet <corbet@lwn.net>,
lkml <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
Linux API <linux-api@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@linux.intel.com>
Subject: Re: [PATCH 5/8] x86, pkeys: allocation/free syscalls
Date: Wed, 1 Jun 2016 17:17:26 -0700 [thread overview]
Message-ID: <574F7B16.4080906@sr71.net> (raw)
In-Reply-To: <CAKgNAkiyD_2tAxrBxirxViViMUsfLRRqQp5HowM58dG21LAa7Q@mail.gmail.com>
On 06/01/2016 05:11 PM, Michael Kerrisk (man-pages) wrote:
>>> >>
>>> >> If I read this right, it doesn't actually remove any pkey restrictions
>>> >> that may have been applied while the key was allocated. So there could be
>>> >> pages with that key assigned that might do surprising things if the key is
>>> >> reallocated for another use later, right? Is that how the API is intended
>>> >> to work?
>> >
>> > Yeah, that's how it works.
>> >
>> > It's not ideal. It would be _best_ if we during mm_pkey_free(), we
>> > ensured that no VMAs under that mm have that vma_pkey() set. But, that
>> > search would be potentially expensive (a walk over all VMAs), or would
>> > force us to keep a data structure with a count of all the VMAs with a
>> > given key.
>> >
>> > I should probably discuss this behavior in the manpages and address it
> s/probably//
>
> And, did I miss it. Was there an updated man-pages patch in the latest
> series? I did not notice it.
There have been to changes to the patches that warranted updating the
manpages until now. I'll send the update immediately.
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next prev parent reply other threads:[~2016-06-02 0:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-31 15:28 [PATCH 0/8] System Calls for Memory Protection Keys Dave Hansen
2016-05-31 15:28 ` [PATCH 1/8] x86, pkeys: add fault handling for PF_PK page fault bit Dave Hansen
2016-05-31 15:28 ` [PATCH 2/8] mm: implement new pkey_mprotect() system call Dave Hansen
2016-05-31 15:28 ` [PATCH 3/8] x86, pkeys: make mprotect_key() mask off additional vm_flags Dave Hansen
2016-05-31 15:28 ` [PATCH 4/8] x86: wire up mprotect_key() system call Dave Hansen
2016-05-31 15:28 ` [PATCH 5/8] x86, pkeys: allocation/free syscalls Dave Hansen
2016-06-01 18:37 ` Jonathan Corbet
2016-06-01 19:32 ` Dave Hansen
2016-06-02 0:11 ` Michael Kerrisk (man-pages)
2016-06-02 0:17 ` Dave Hansen [this message]
2016-06-03 0:26 ` Michael Kerrisk (man-pages)
2016-06-03 17:28 ` Dave Hansen
2016-06-03 19:27 ` Michael Kerrisk (man-pages)
2016-06-01 20:48 ` Arnd Bergmann
2016-06-02 21:10 ` Dave Hansen
2016-05-31 15:28 ` [PATCH 6/8] x86, pkeys: add pkey set/get syscalls Dave Hansen
2016-05-31 15:28 ` [PATCH 7/8] pkeys: add details of system call use to Documentation/ Dave Hansen
2016-06-01 16:43 ` Jonathan Corbet
2016-06-01 16:46 ` Dave Hansen
2016-06-01 16:49 ` Jonathan Corbet
2016-06-01 17:10 ` Dave Hansen
2016-05-31 15:28 ` [PATCH 8/8] x86, pkeys: add self-tests Dave Hansen
-- strict thread matches above, loose matches on Subject: below --
2016-04-11 15:54 [PATCH 0/8] System Calls for Memory Protection Keys Dave Hansen
2016-04-11 15:54 ` [PATCH 5/8] x86, pkeys: allocation/free syscalls Dave Hansen
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