netdev - Re: [PATCH bpf-next 3/4] xsk: avoid store-tearing when assigning umem

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Date:   Fri, 23 Aug 2019 09:44:04 -0700
From:   "Jonathan Lemon" <jonathan.lemon@...il.com>
To:     "Björn Töpel" <bjorn.topel@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
        "Björn Töpel" <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, magnus.karlsson@...il.com,
        bpf@...r.kernel.org,
        syzbot+c82697e3043781e08802@...kaller.appspotmail.com,
        hdanton@...a.com, i.maximets@...sung.com
Subject: Re: [PATCH bpf-next 3/4] xsk: avoid store-tearing when assigning umem



On 22 Aug 2019, at 2:13, Björn Töpel wrote:

> From: Björn Töpel <bjorn.topel@...el.com>
>
> The umem member of struct xdp_sock is read outside of the control
> mutex, in the mmap implementation, and needs a WRITE_ONCE to avoid
> potentional store-tearing.
>
> Fixes: 423f38329d26 ("xsk: add umem fill queue support and mmap")
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>

Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>