linux-kernel - Re: [Bug] WARNING in vt_do_diacrit in Linux Kernel v6.14

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Message-ID: <2025070923-alabaster-trilogy-d011@gregkh>
Date: Wed, 9 Jul 2025 12:15:44 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Luka <luka.2016.cs@...il.com>, Jiri Slaby <jirislaby@...nel.org>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [Bug] WARNING in vt_do_diacrit in Linux Kernel v6.14

On Wed, Jul 09, 2025 at 09:07:00AM +0200, Krzysztof Kozlowski wrote:
> On 08/07/2025 09:49, Greg KH wrote:
> > On Tue, Jul 08, 2025 at 03:21:36PM +0800, Luka wrote:
> >> Dear Linux Kernel Maintainers,
> >>
> >> I hope this message finds you well.
> >>
> >> I am writing to report a potential vulnerability I encountered during
> >> testing of the Linux Kernel version v6.14.
> >>
> >> Git Commit: 38fec10eb60d687e30c8c6b5420d86e8149f7557 (tag: v6.14)
> >>
> >> Bug Location: drivers/tty/vt/keyboard.c
> >>
> >> Bug report: https://pastebin.com/yuVJpati
> >>
> >> Complete log: https://pastebin.com/qKnipvvK
> >>
> >> Entire kernel config: https://pastebin.com/MRWGr3nv
> >>
> >> Root Cause Analysis:
> >> The vt_do_diacrit() function in the virtual terminal subsystem
> >> performs a write to a user-space pointer via __put_user_4() without
> >> ensuring that the destination address is mapped and accessible.
> > 
> > Where?  I see calls to put_user() happening in that function, and the
> > return value is properly checked.  What lines exactly show the issue?
> 
> Greg,
> 
> Please don't waste time on this bot. It is AI generated spam. The person
> learnt nothing from previous feedback.
> 
> I suggest ignoring completely.

Thanks for the warning.  Given the lack of response to our questions, I
kind of figured that was the case :(

greg k-h