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Date:   Tue, 23 Feb 2021 20:44:36 +0800
From:   Aili Yao <yaoaili@kingsoft.com>
To:     "HORIGUCHI =?UTF-8?B?TkFPWUE=?=(=?UTF-8?B?5aCA5Y+j44CA55u05Lmf?=)" 
        <naoya.horiguchi@nec.com>
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Subject: Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for
 hwpoison page access.
Message-ID: <20210223204436.1df73153@alex-virtual-machine>
In-Reply-To: <20210205170135.22f771a2@alex-virtual-machine>
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        <20210204072555.GA22850@hori.linux.bs1.fc.nec.co.jp>
        <20210205170135.22f771a2@alex-virtual-machine>
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On Fri, 5 Feb 2021 17:01:35 +0800
Aili Yao <yaoaili@kingsoft.com> wrote:

> When one page is already hwpoisoned by MCE AO action, processes may not
> be killed, processes mapping this page may make a syscall include this
> page and result to trigger a VM_FAULT_HWPOISON fault, as it's in kernel
> mode it may be fixed by fixup_exception, current code will just return
> error code to user code.
> 
> This is not sufficient, we should send a SIGBUS to the process and log
> the info to console, as we can't trust the process will handle the error
> correctly.
> 
> Suggested-by: Feng Yang <yangfeng1@kingsoft.com>
> Signed-off-by: Aili Yao <yaoaili@kingsoft.com>
> ---
>  arch/x86/mm/fault.c | 62 +++++++++++++++++++++++++++++----------------
>  1 file changed, 40 insertions(+), 22 deletions(-)
> 
Hi luto;
  Is there any feedback?

Thanks
Aili Yao