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From: Dave Hansen <dave@sr71.net>
To: Vlastimil Babka <vbabka@suse.cz>, linux-kernel@vger.kernel.org
Cc: x86@kernel.org, linux-api@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	torvalds@linux-foundation.org, akpm@linux-foundation.org,
	luto@kernel.org, mgorman@techsingularity.net,
	dave.hansen@linux.intel.com, arnd@arndb.de
Subject: Re: [PATCH 08/10] x86, pkeys: default to a restrictive init PKRU
Date: Mon, 1 Aug 2016 07:58:08 -0700	[thread overview]
Message-ID: <579F6380.2070600@sr71.net> (raw)
In-Reply-To: <cd74ae8b-36e4-a397-e36f-fe3d4281d400@suse.cz>

On 08/01/2016 07:42 AM, Vlastimil Babka wrote:
> On 07/29/2016 06:30 PM, Dave Hansen wrote:
>> This does not cause any practical problems with applications
>> using protection keys because we require them to specify initial
>> permissions for each key when it is allocated, which override the
>> restrictive default.
> 
> Here you mean the init_access_rights parameter of pkey_alloc()? So will
> children of fork() after that pkey_alloc() inherit the new value or go
> default?

Hi Vlastimil,

Yes, exactly, the initial permissions are provided via pkey_alloc()'s
'init_access_rights' argument.

Do you mean fork() or clone()?  In both cases, we actually copy the FPU
state from the parent, so children always inherit the state from their
parent which contains the permissions set by the parent's calls to
pkey_alloc().

WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@sr71.net>
To: Vlastimil Babka <vbabka@suse.cz>, linux-kernel@vger.kernel.org
Cc: x86@kernel.org, linux-api@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	torvalds@linux-foundation.org, akpm@linux-foundation.org,
	luto@kernel.org, mgorman@techsingularity.net,
	dave.hansen@linux.intel.com, arnd@arndb.de
Subject: Re: [PATCH 08/10] x86, pkeys: default to a restrictive init PKRU
Date: Mon, 1 Aug 2016 07:58:08 -0700	[thread overview]
Message-ID: <579F6380.2070600@sr71.net> (raw)
In-Reply-To: <cd74ae8b-36e4-a397-e36f-fe3d4281d400@suse.cz>

On 08/01/2016 07:42 AM, Vlastimil Babka wrote:
> On 07/29/2016 06:30 PM, Dave Hansen wrote:
>> This does not cause any practical problems with applications
>> using protection keys because we require them to specify initial
>> permissions for each key when it is allocated, which override the
>> restrictive default.
> 
> Here you mean the init_access_rights parameter of pkey_alloc()? So will
> children of fork() after that pkey_alloc() inherit the new value or go
> default?

Hi Vlastimil,

Yes, exactly, the initial permissions are provided via pkey_alloc()'s
'init_access_rights' argument.

Do you mean fork() or clone()?  In both cases, we actually copy the FPU
state from the parent, so children always inherit the state from their
parent which contains the permissions set by the parent's calls to
pkey_alloc().

--
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  reply	other threads:[~2016-08-01 15:00 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-29 16:30 [PATCH 00/10] [v6] System Calls for Memory Protection Keys Dave Hansen
2016-07-29 16:30 ` Dave Hansen
2016-07-29 16:30 ` [PATCH 01/10] x86, pkeys: add fault handling for PF_PK page fault bit Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:10   ` [tip:mm/pkeys] x86/pkeys: Add " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 02/10] mm: implement new pkey_mprotect() system call Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:11   ` [tip:mm/pkeys] mm: Implement " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 03/10] x86, pkeys: make mprotect_key() mask off additional vm_flags Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:11   ` [tip:mm/pkeys] x86/pkeys: Make " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 04/10] x86, pkeys: allocation/free syscalls Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:12   ` [tip:mm/pkeys] x86/pkeys: Allocation/free syscalls tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 05/10] x86: wire up protection keys system calls Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:12   ` [tip:mm/pkeys] x86: Wire " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 06/10] generic syscalls: wire up memory protection keys syscalls Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:12   ` [tip:mm/pkeys] generic syscalls: Wire " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 07/10] pkeys: add details of system call use to Documentation/ Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:13   ` [tip:mm/pkeys] pkeys: Add " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 08/10] x86, pkeys: default to a restrictive init PKRU Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-07-29 17:29   ` Andy Lutomirski
2016-07-29 17:29     ` Andy Lutomirski
2016-07-29 17:50     ` Dave Hansen
2016-07-29 17:50       ` Dave Hansen
2016-07-29 19:44       ` Andy Lutomirski
2016-07-29 19:44         ` Andy Lutomirski
2016-08-01 14:42   ` Vlastimil Babka
2016-08-01 14:42     ` Vlastimil Babka
2016-08-01 14:58     ` Dave Hansen [this message]
2016-08-01 14:58       ` Dave Hansen
2016-08-02  8:20       ` Vlastimil Babka
2016-08-02  8:20         ` Vlastimil Babka
2016-09-09 11:13   ` [tip:mm/pkeys] x86/pkeys: Default " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 09/10] x86, pkeys: allow configuration of init_pkru Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-08-02  8:28   ` Vlastimil Babka
2016-08-02  8:28     ` Vlastimil Babka
2016-08-02 14:37     ` Dave Hansen
2016-08-02 14:37       ` Dave Hansen
2016-09-09 11:14   ` [tip:mm/pkeys] x86/pkeys: Allow " tip-bot for Dave Hansen
2016-07-29 16:30 ` [PATCH 10/10] x86, pkeys: add self-tests Dave Hansen
2016-07-29 16:30   ` Dave Hansen
2016-09-09 11:14   ` [tip:mm/pkeys] x86/pkeys: Add self-tests tip-bot for Dave Hansen
2016-08-08 23:18 [PATCH 00/10] [v6] System Calls for Memory Protection Keys Dave Hansen
2016-08-08 23:18 ` [PATCH 08/10] x86, pkeys: default to a restrictive init PKRU Dave Hansen
2016-08-08 23:18   ` Dave Hansen

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