linux-kernel - Re: KASAN: slab-out-of-bounds Read in vcs_scr

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Message-ID: <nycvar.YSQ.7.76.1912031622320.17114@knanqh.ubzr>
Date:   Tue, 3 Dec 2019 16:33:26 -0500 (EST)
From:   Nicolas Pitre <nico@...xnic.net>
To:     syzbot <syzbot+7d027845265d531ba506@...kaller.appspotmail.com>
cc:     daniel.vetter@...ll.ch, Dave Mielke <dave@...lke.cc>,
        ghalat@...hat.com, gregkh@...uxfoundation.org, jslaby@...e.com,
        kilobyte@...band.pl, linux-kernel@...r.kernel.org,
        sam@...nborg.org, syzkaller-bugs@...glegroups.com,
        textshell@...uujin.de, tomli@...li.me
Subject: Re: KASAN: slab-out-of-bounds Read in vcs_scr_readw

On Tue, 3 Dec 2019, syzbot wrote:

> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    596cf45c Merge branch 'akpm' (patches from Andrew)
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14c1d196e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8eb54eee6e6ca4a7
> dashboard link: https://syzkaller.appspot.com/bug?extid=7d027845265d531ba506
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11c6090ee00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13821b7ae00000
> 
> The bug was bisected to:
> 
> commit d21b0be246bf3bbf569e6e239f56abb529c7154e
> Author: Nicolas Pitre <nicolas.pitre@...aro.org>
> Date:   Wed Jun 27 03:56:41 2018 +0000
> 
>    vt: introduce unicode mode for /dev/vcs
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1292fbf2e00000
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=1192fbf2e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1692fbf2e00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+7d027845265d531ba506@...kaller.appspotmail.com
> Fixes: d21b0be246bf ("vt: introduce unicode mode for /dev/vcs")

This is most likely the same issue that was fixed and queued for 
mainline already. The fix is accessible as commit 0c9acb1af77a in the 
linux-next tree.


Nicolas