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

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Subject: RE: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
From: "Luck, Tony" <tony.luck@xxxxxxxxx>
Date: Thu, 11 Mar 2021 16:52:10 +0000
Accept-language: en-US
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, HORIGUCHI NAOYA <naoya.horiguchi@xxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, 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>
Dlp-product: dlpe-windows
Dlp-reaction: no-action
Dlp-version: 11.5.1.3
In-reply-to: <CALCETrVqkK29n=6wtVhd7qgTWf83x3SUk6+bkD30asHyWSqppw@mail.gmail.com>
References: <4fc1b4e8f1fb4c8c81f280db09178797@intel.com> <047D5B49-FDBB-494C-81E9-DA811476747D@amacapital.net> <20210311091941.45790fcf@alex-virtual-machine> <CALCETrVqkK29n=6wtVhd7qgTWf83x3SUk6+bkD30asHyWSqppw@mail.gmail.com>

> 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?

-Tony

Follow-Ups:
- Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.
  - From: Peter Zijlstra

References:
- 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

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