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

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Message-ID: <20200928020752.GA871730@jagdpanzerIV.localdomain>
Date:   Mon, 28 Sep 2020 11:07:52 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.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

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/

	-ss