linux-kernel - Re: [PATCH v2 0/2] x86: Relocate the compat vdso per process

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Message-ID: <531FEA69.7050107@zytor.com>
Date:	Tue, 11 Mar 2014 22:02:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org
CC:	Stefani Seibold <stefani@...bold.net>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v2 0/2] x86: Relocate the compat vdso per process

On 03/11/2014 03:15 PM, Andy Lutomirski wrote:
> The meat of this patch series is in patch 1.  Patch 2 is split out for
> improved bisectability.
>
> Changes from v1: Split into two patches and fixed a comment.
>
> Andy Lutomirski (2):
>    x86: Dynamically relocate the compat vdso
>    x86_32: Remove user bit from identity map PDE
>
>   Documentation/kernel-parameters.txt  |  18 +++-
>   arch/x86/Kconfig                     |  24 +++--
>   arch/x86/include/asm/elf.h           |   4 -
>   arch/x86/include/asm/fixmap.h        |   8 --
>   arch/x86/include/asm/pgtable_types.h |   7 +-
>   arch/x86/include/asm/vdso.h          |   5 +-
>   arch/x86/vdso/vdso-layout.lds.S      |   2 +-
>   arch/x86/vdso/vdso32-setup.c         | 173 ++++++++++++++++-------------------
>   arch/x86/vdso/vdso32/vdso32.lds.S    |   2 -
>   9 files changed, 111 insertions(+), 132 deletions(-)
>

Why per process?  *If* we have compat vdso turned on, can't we just put 
it in one place system-wide?

	-hpa

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