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Date: Wed, 10 May 2017 18:37:42 +0200
From: Andrey Konovalov <andreyknvl@...gle.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2017-7308: Linux kernel: integer overflow in packet_set_ring

On Fri, Mar 31, 2017 at 7:20 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> On Fri, Mar 31, 2017 at 2:03 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
>> Hi,
>>
>> CVE-2017-7308 [1] was assigned to the following issue:
>>
>> The packet_set_ring function in net/packet/af_packet.c in the Linux
>> kernel through 4.10.6 does not properly validate certain block-size
>> data, which allows local users to cause a denial of service (overflow)
>> or possibly have unspecified other impact via crafted system calls.
>>
>> The fix is sent upstream [2].
>
> Update: the fix actually consists of 3 patches:
>
> https://patchwork.ozlabs.org/patch/744811/
> https://patchwork.ozlabs.org/patch/744813/
> https://patchwork.ozlabs.org/patch/744812/

Another update: this turned out to be exploitable.

Details are here:
https://googleprojectzero.blogspot.com/2017/05/exploiting-linux-kernel-via-packet.html

>
>>
>> [1] http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2017-7308
>>
>> [2] https://patchwork.ozlabs.org/patch/744811/

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