linux-kernel - Re: KASAN: global-out-of-bounds in console

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Message-ID: <20200929121016.GR6442@alley>
Date:   Tue, 29 Sep 2020 14:10:16 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>
Subject: Re: KASAN: global-out-of-bounds in console_unlock

On Mon 2020-09-28 11:07:52, Sergey Senozhatsky wrote:
> Cc-ing John and Steven
> 
> On (20/09/27 11:12), Dmitry Vyukov wrote:
> > Hi printk maintainers,
> > 
> > I've got the following out-of-bounds in printk code.
> > This is on next-20200925. Config is attached.
> > This is just on pr_cont("\n"). Something overreads the string.
> > 
> > ==================================================================
> > BUG: KASAN: global-out-of-bounds in memchr+0x65/0x80 lib/string.c:1058
> > Read of size 1 at addr ffffffff8c68c860 by task swapper/0/0
> 
> Thanks for the report. I think this should be fixed by
> https://lore.kernel.org/lkml/20200926015526.8921-1-john.ogness@linutronix.de/

I agree with Sergey. This looks very much like the same problem.

Best Regards,
Petr