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

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Date: Tue, 27 Feb 2024 14:33:50 +0100
From: Carlos López <clopez@...e.de>
To: cve@...nel.org, linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: CVE-2021-46934: i2c: validate user data in compat ioctl

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?

-- 
Carlos López
Security Engineer
SUSE Software Solutions