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

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Message-ID: <0f852429-c69d-1520-2db5-6f2370799566@i-love.sakura.ne.jp>
Date:   Thu, 30 Jan 2020 02:34:57 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     anon anon <742991625abc@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Petr Mladek <pmladek@...e.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        syzkaller <syzkaller@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>
Subject: Re: KASAN: slab-out-of-bounds Write in vgacon_scroll

A fbcon bug found that allocation size was wrong.
  https://groups.google.com/d/msg/syzkaller-bugs/TVGAFDeUKJo/uchTlvbFAQAJ
You can try adding printk() for examining values because you have reproducers.