Re: CVE-2017-7308: Linux kernel: integer overflow in packet_set_ring

[Andrey Konovalov <andreyknvl () google com>]

On Fri, Mar 31, 2017 at 7:20 PM, Andrey Konovalov <andreyknvl () google com> wrote:
> On Fri, Mar 31, 2017 at 2:03 PM, Andrey Konovalov <andreyknvl () google 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/