linux-kernel - Re: [devkmsg_write] BUG: KASAN: slab-out-of-bounds in copyin+0xea/0x170

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Message-ID: <b736e02e-626c-1d4a-4b2d-c041b451e50c@virtuozzo.com>
Date:   Tue, 7 Nov 2017 15:12:12 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Fengguang Wu <fengguang.wu@...el.com>,
        linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Aleksey Makarov <aleksey.makarov@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: [devkmsg_write] BUG: KASAN: slab-out-of-bounds in
 copyin+0xea/0x170



On 11/07/2017 02:59 PM, Sergey Senozhatsky wrote:
> On (11/07/17 19:45), Sergey Senozhatsky wrote:
> [..]

> 
> a quite similar KASAN report
> https://marc.info/?l=linux-kernel&m=150900582526314&w=2

Yours is different. It looks like a real bug, the report says that
we read 34 bytes from kmalloc-32 object.

> 
> on my box "test_printf: all 260 tests passed".
> 
> 	-ss
>