Re: [PATCH v4] net: don't call strlen() on the user buffer in packet_bind_spkt()

[Cong Wang]

On Wed, Mar 1, 2017 at 3:57 AM, Alexander Potapenko <glider@xxxxxxxxxx> wrote:
> This happens because addr.sa_data copied from the userspace is not
> zero-terminated, and copying it with strlcpy() in packet_bind_spkt()
> results in calling strlen() on the kernel copy of that non-terminated
> buffer.

Very similar to

commit b301f2538759933cf9ff1f7c4f968da72e3f0757
Author: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Date:   Thu Mar 24 21:29:53 2016 +0100

    netfilter: x_tables: enforce nul-terminated table name from
getsockopt GET_ENTRIES