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

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To: "Luck, Tony" <tony.luck@xxxxxxxxx>
Subject: Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 11 Mar 2021 17:56:58 +0100
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Aili Yao <yaoaili@xxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, HORIGUCHI NAOYA <naoya.horiguchi@xxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, "yangfeng1@xxxxxxxxxxxx" <yangfeng1@xxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, "sunhao2@xxxxxxxxxxxx" <sunhao2@xxxxxxxxxxxx>
In-reply-to: <0a0909a9005842fa9e49ba9917580e79@intel.com>
References: <4fc1b4e8f1fb4c8c81f280db09178797@intel.com> <047D5B49-FDBB-494C-81E9-DA811476747D@amacapital.net> <20210311091941.45790fcf@alex-virtual-machine> <CALCETrVqkK29n=6wtVhd7qgTWf83x3SUk6+bkD30asHyWSqppw@mail.gmail.com> <0a0909a9005842fa9e49ba9917580e79@intel.com>

On Thu, Mar 11, 2021 at 04:52:10PM +0000, Luck, Tony wrote:
> > I think we need to at least fix the existing bug before we add more
> > signals.  AFAICS the MCE_IN_KERNEL_COPYIN code is busted for kernel
> > threads.
> 
> Can a kernel thread do get_user() or copy_from_user()?  Do we have kernel threads
> that have an associated user address space to copy from?

kthread_use_mm()

References:
- RE: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
  - From: Luck, Tony
- Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
  - From: Andy Lutomirski
- Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
  - From: Aili Yao
- Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
  - From: Andy Lutomirski
- RE: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
  - From: Luck, Tony

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