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

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Message-ID: <20200129143754.GA15445@jagdpanzerIV.localdomain>
Date:   Wed, 29 Jan 2020 23:40:52 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     anon anon <742991625abc@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Petr Mladek <pmladek@...e.com>, wangkefeng.wang@...wei.com,
        syzkaller@...glegroups.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: KASAN: slab-out-of-bounds Write in vgacon_scroll

Cc-ing Dmitry and Tetsuo

Original Message-id: CAA=061EoW8AmjUrBLsJy5nTDz-1jeArLeB+z6HJuyZud0zZXug@...l.gmail.com

On (20/01/29 23:17), Sergey Senozhatsky wrote:
> > 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.
> 
> These questions were addressed to anon anon (742991625abc@...il.com),
> not to Bartlomiej.

Could this be GCC_PLUGIN related?

	-ss