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

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Message-ID: <YrmixTj6aF3Pwq0I@kroah.com>
Date:   Mon, 27 Jun 2022 14:29:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Yangxi Xiang <xyangxi5@...il.com>
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

On Mon, Jun 27, 2022 at 07:40:16PM +0800, Yangxi Xiang wrote:
> > And what commit id does this fix, or has it always been broken?
> 
> It fixes the commit 81732c3 (tty vt: Fix line garbage in virtual
> console on command line edition). The line buffer is not always
> broken, because the memcpy utilized the hardware acceleration, whose
> result is not deterministic. I fix this issue by replacing the
> scr_memcpyw with scr_memmovew used in insert_char, and preserving the
> memcpy optimization when the buffers are not overlapping.

Great, can you please resend the patch with that information all in it,
and the proper Fixes: line tag added?

thanks,

greg k-h