linux-kernel - Re: [PATCH 2/4] HWPOISON: Copy si_addr

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Date:	Thu, 7 Oct 2010 09:36:33 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	fengguang.wu@...el.com, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/4] HWPOISON: Copy si_addr_lsb to user

On Thu, Oct 07, 2010 at 03:31:31PM +0900, Hidetoshi Seto wrote:
> (2010/10/07 5:48), Andi Kleen wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > The original hwpoison code added a new siginfo field si_addr_lsb to
> > pass the granuality of the fault address to user space. Unfortunately
> > this field was never copied to user space. Fix this here.
> > 
> > I added explicit checks for the MCEERR codes to avoid having
> > to patch all potential callers to initialize the field.
> 
> Now QEMU uses signalfd to catch the SIGBUS delivered to the
> main thread, so I think similar fix to copy lsb to user is
> required for signalfd too. 

Good catch. I don't think qemu uses this today, but it should
be fixed there too for .37 at least.

-Andi

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