linux-kernel - Re: [PATCH] x86/hpet: Read HPET directly if panic in progress

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Date: Wed, 5 Jun 2024 18:10:07 +0800
From: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To: Borislav Petkov <bp@...en8.de>
CC: Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds
	<torvalds@...ux-foundation.org>, Dave Hansen <dave.hansen@...el.com>,
	<mingo@...hat.com>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
	<hpa@...or.com>, <keescook@...omium.org>, <tony.luck@...el.com>,
	<gpiccoli@...lia.com>, <mat.jonczyk@...pl>, <rdunlap@...radead.org>,
	<alexandre.belloni@...tlin.com>, <mario.limonciello@....com>,
	<yaolu@...inos.cn>, <bhelgaas@...gle.com>, <justinstitt@...gle.com>,
	<linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>,
	<CobeChen@...oxin.com>, <TimGuo@...oxin.com>, <LeoLiu-oc@...oxin.com>
Subject: Re: [PATCH] x86/hpet: Read HPET directly if panic in progress



On 2024/6/5 17:36, Borislav Petkov wrote:
> 
> 
> [这封邮件来自外部发件人 谨防风险]
> 
> On Wed, Jun 05, 2024 at 02:23:32PM +0800, Tony W Wang-oc wrote:
>> After MCE has occurred, it is possible for the MCE handler to execute the
>> add_taint() function without panic. For example, the fake_panic is
>> configured.
> 
> fake_panic is an ancient debugging leftover. If you set it, you get what
> you deserve.
> 

It may also happen without setting fake_panic, such as an MCE error of 
the UCNA/SRAO type occurred?

Sincerely
TonyWWang-oc

> --
> Regards/Gruss,
>      Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette