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

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Message-ID: <0a0909a9005842fa9e49ba9917580e79@intel.com>
Date:   Thu, 11 Mar 2021 16:52:10 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Andy Lutomirski <luto@...capital.net>,
        Aili Yao <yaoaili@...gsoft.com>
CC:     Oleg Nesterov <oleg@...hat.com>,
        Linux API <linux-api@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        HORIGUCHI NAOYA <naoya.horiguchi@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        "yangfeng1@...gsoft.com" <yangfeng1@...gsoft.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "sunhao2@...gsoft.com" <sunhao2@...gsoft.com>
Subject: RE: [PATCH v3] x86/fault: Send a SIGBUS to user process always for
 hwpoison page access.

> 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