linux-kernel - Re: [PATCH 0/2] um: improve UML page fault handling

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Message-ID: <20240103135153.4696cb0f@meshulam.tesarici.cz>
Date: Wed, 3 Jan 2024 13:51:53 +0100
From: Petr Tesařík <petr@...arici.cz>
To: Richard Weinberger <richard@....at>, Anton Ivanov
 <anton.ivanov@...bridgegreys.com>, Johannes Berg
 <johannes@...solutions.net>
Cc: Petr Tesarik <petrtesarik@...weicloud.com>, linux-um@...ts.infradead.org
 (open list:USER-MODE LINUX (UML)), linux-kernel@...r.kernel.org (open
 list), Roberto Sassu <roberto.sassu@...weicloud.com>, Petr Tesarik
 <petr.tesarik1@...wei-partners.com>
Subject: Re: [PATCH 0/2] um: improve UML page fault handling

Happy New Year, everyone!

I can fully understand that you all have had other priorities around
the year end; it was no different with me. ;-)

However, may I kindly ask for some feedback on my proposed fixes?

Petr T

On Fri, 15 Dec 2023 13:14:29 +0100
Petr Tesarik <petrtesarik@...weicloud.com> wrote:

> From: Petr Tesarik <petr.tesarik1@...wei-partners.com>
> 
> Improve UML handling of segmentation faults in kernel mode. Although
> such page faults are generally caused by a kernel bug, it is annoying
> if they cause an infinite loop, or panic the kernel. More importantly,
> a robust implementation allows to write KUnit tests for various guard
> pages, preventing potential kernel self-protection regressions.
> 
> Petr Tesarik (2):
>   um: do not panic on kernel mode faults
>   um: oops on accessing an non-present page in the vmalloc area
> 
>  arch/um/kernel/trap.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
>