linux-kernel - Re: [PATCH 1/1] pagemap: fix buffer overflow in add_page

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Message-ID: <CAHGf_=odM+yTTLvqwEw8MztkFEf_kjxvixDqn3g4hpCed4fEzQ@mail.gmail.com>
Date:	Sat, 10 Aug 2013 12:47:24 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	yonghua zheng <younghua.zheng@...il.com>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 1/1] pagemap: fix buffer overflow in add_page_map()

On Fri, Aug 9, 2013 at 8:49 PM, yonghua zheng <younghua.zheng@...il.com> wrote:
> Update the patch according to Naoya's comment, I also run
> ./scripts/checkpatch.pl, and it passed ;D.
>
> From 96826b0fdf9ec6d6e16c2c595f371dbb841250f7 Mon Sep 17 00:00:00 2001
> From: Yonghua Zheng <younghua.zheng@...il.com>
> Date: Mon, 5 Aug 2013 12:12:24 +0800
> Subject: [PATCH 1/1] pagemap: fix buffer overflow in add_to_pagemap()
>
> In struc pagemapread:
>
> struct pagemapread {
>     int pos, len;
>     pagemap_entry_t *buffer;
>     bool v2;
> };
>
> pos is number of PM_ENTRY_BYTES in buffer, but len is the size of buffer,
> it is a mistake to compare pos and len in add_to_pagemap() for checking
> buffer is full or not, and this can lead to buffer overflow and random
> kernel panic issue.
>
> Correct len to be total number of PM_ENTRY_BYTES in buffer.
>
> Signed-off-by: Yonghua Zheng <younghua.zheng@...il.com>

Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
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