linux-kernel - Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.

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Date:   Tue, 23 Feb 2021 20:44:36 +0800
From:   Aili Yao <yaoaili@...gsoft.com>
To:     "HORIGUCHI NAOYA堀口　直也)" 
        <naoya.horiguchi@....com>
CC:     "tony.luck@...el.com" <tony.luck@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "YANGFENG1@...gsoft.com" <YANGFENG1@...gsoft.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for
 hwpoison page access.

On Fri, 5 Feb 2021 17:01:35 +0800
Aili Yao <yaoaili@...gsoft.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@...gsoft.com>
> Signed-off-by: Aili Yao <yaoaili@...gsoft.com>
> ---
>  arch/x86/mm/fault.c | 62 +++++++++++++++++++++++++++++----------------
>  1 file changed, 40 insertions(+), 22 deletions(-)
> 
Hi luto;
  Is there any feedback?

Thanks
Aili Yao