linux-kernel - Re: [RFC v2 2/7] arm: Use generic VDSO unmap and remap

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Message-ID: <20161101171833.GS1041@n2100.armlinux.org.uk>
Date:   Tue, 1 Nov 2016 17:18:33 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Christopher Covington <cov@...eaurora.org>
Cc:     criu@...nvz.org, Will Deacon <will.deacon@....com>,
        linux-mm@...ck.org, Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 2/7] arm: Use generic VDSO unmap and remap

You know, on its own, this patch is totally meaningless.  Sorry, there's
nothing more I can say about this.

On Tue, Nov 01, 2016 at 11:10:56AM -0600, Christopher Covington wrote:
> Checkpoint/Restore In Userspace (CRIU) needs to be able to unmap and remap
> the VDSO to successfully checkpoint and restore applications in the face of
> changing VDSO addresses due to Address Space Layout Randomization (ASLR,
> randmaps). Previously, this was implemented in architecture-specific code
> for PowerPC and x86. However, a generic version based on Laurent Dufour's
> PowerPC implementation is now available, so begin using it on ARM.
> 
> Signed-off-by: Christopher Covington <cov@...eaurora.org>
> ---
>  arch/arm/mm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
> index c1799dd..1d3312b 100644
> --- a/arch/arm/mm/Kconfig
> +++ b/arch/arm/mm/Kconfig
> @@ -845,6 +845,7 @@ config VDSO
>  	depends on AEABI && MMU && CPU_V7
>  	default y if ARM_ARCH_TIMER
>  	select GENERIC_TIME_VSYSCALL
> +	select GENERIC_VDSO
>  	help
>  	  Place in the process address space an ELF shared object
>  	  providing fast implementations of gettimeofday and
> -- 
> Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc.
> Qualcomm Technologies, Inc. is a member of the
> Code Aurora Forum, a Linux Foundation Collaborative Project.
> 

-- 
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