linux-kernel - Re: KASAN: slab-out-of-bounds Write in vgacon

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Message-ID: <20200129141517.GA13721@jagdpanzerIV.localdomain>
Date:   Wed, 29 Jan 2020 23:15:17 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     Petr Mladek <pmladek@...e.com>, anon anon <742991625abc@...il.com>,
        wangkefeng.wang@...wei.com, sergey.senozhatsky@...il.com,
        syzkaller@...glegroups.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org
Subject: Re: KASAN: slab-out-of-bounds Write in vgacon_scroll

On (20/01/28 15:58), Bartlomiej Zolnierkiewicz wrote:
[..]
> 
> Help is welcomed as I'm not going to look at it in the foreseeable future
> (I'm busy enough with other things).
> 
> > (dri-devel@...ts.freedesktop.org or linux-fbdev@...r.kernel.org) into CC?
> 
> Added to Cc:, thanks.

Hmm. There is something strange about it. I use vga console quite
often, and scrolling happens all the time, yet I can't get the same
out-of-bounds report (nor have I ever seen it in the past), even with
the reproducer. Is it supposed to be executed as it is, or are there
any preconditions? Any chance that something that runs prior to that
reproducer somehow impacts the system? Just asking.

	-ss