linux-kernel - Re: [PATCH] vt: fix memory overlapping when deleting chars in the buffer

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Message-Id: <20220627110417.27648-1-xyangxi5@gmail.com>
Date:   Mon, 27 Jun 2022 19:04:17 +0800
From:   Yangxi Xiang <xyangxi5@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Igor Matheus Andrade Torrente <igormtorrente@...il.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        nick black <dankamongmen@...il.com>
Subject: Re: [PATCH] vt: fix memory overlapping when deleting chars in the buffer

> What commit does this fix?  how was this tested?

This bug is triggered by running a dynamic analysis on the kernel,
with the help of sanitizer to observe this bug. This memory
overlapping copy can cause data corruption when scr_memcpyw is
optimized to memcpy because memcpy does not ensure its behavior if
the destination buffer overlaps with the source buffer.

Yangxi Xiang