linux-kernel - Re: CVE-2021-46934: i2c: validate user data in compat ioctl

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Message-ID: <2024022720-derived-impish-d245@gregkh>
Date: Tue, 27 Feb 2024 15:06:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Carlos López <clopez@...e.de>
Cc: cve@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: CVE-2021-46934: i2c: validate user data in compat ioctl

On Tue, Feb 27, 2024 at 02:33:50PM +0100, Carlos López wrote:
> Hi,
> 
> On 27/2/24 10:48, Greg Kroah-Hartman wrote:
> > Description
> > ===========
> > 
> > In the Linux kernel, the following vulnerability has been resolved:
> > 
> > i2c: validate user data in compat ioctl
> > 
> > Wrong user data may cause warning in i2c_transfer(), ex: zero msgs.
> > Userspace should not be able to trigger warnings, so this patch adds
> > validation checks for user data in compact ioctl to prevent reported
> > warnings
> 
> What's the security impact here exactly?

Userspace should never be able to trigger kernel warnings.