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

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Message-ID: <20180419081735.GA28287@kroah.com>
Date:   Thu, 19 Apr 2018 10:17:35 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     DaeRyong Jeong <threeearcat@...il.com>
Cc:     Byoungyoung Lee <byoungyoung@...due.edu>,
        Kyungtae Kim <kt0755@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: KASAN: slab-out-of-bounds Write in
 tty_insert_flip_string_fixed_flag

On Thu, Apr 19, 2018 at 05:09:16PM +0900, DaeRyong Jeong wrote:
> We report the crash:
> KASAN: slab-out-of-bounds Write in tty_insert_flip_string_fixed_flag
> 
> This crash has been found in v4.16 using RaceFuzzer (a modified
> version of Syzkaller), which we describe more at the end of this
> report. Our analysis shows that the race occurs when invoking two
> syscalls concurrently, ioctl$TCXONC(r0, 0x540a, 0x2) and
> ioctl$TCXONC(r0, 0x540a, 0x1).

Nice!

Do you have a kernel patch to resolve this issue?

thanks,

greg k-h