linux-kernel - Re: [Linux-kernel-mentees] [PATCH net] xdp: Prevent kernel-infoleak in xsk

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Message-ID: <CAPhsuW7L6KWAM55=oLgQ2MtoJOB9i4mwZHOVF+KJj7W5ht_+YQ@mail.gmail.com>
Date:   Mon, 27 Jul 2020 22:07:20 -0700
From:   Song Liu <song@...nel.org>
To:     Peilin Ye <yepeilin.cs@...il.com>
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        KP Singh <kpsingh@...omium.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [Linux-kernel-mentees] [PATCH net] xdp: Prevent kernel-infoleak
 in xsk_getsockopt()

On Mon, Jul 27, 2020 at 7:30 PM Peilin Ye <yepeilin.cs@...il.com> wrote:
>
> xsk_getsockopt() is copying uninitialized stack memory to userspace when
> `extra_stats` is `false`. Fix it by initializing `stats` with memset().
>
> Cc: stable@...r.kernel.org

8aa5a33578e9 is not in stable branches yet, so we don't need to Cc stable.

> Fixes: 8aa5a33578e9 ("xsk: Add new statistics")
> Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
> ---
>  net/xdp/xsk.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
> index 26e3bba8c204..acf001908a0d 100644
> --- a/net/xdp/xsk.c
> +++ b/net/xdp/xsk.c
> @@ -844,6 +844,8 @@ static int xsk_getsockopt(struct socket *sock, int level, int optname,
>                 bool extra_stats = true;
>                 size_t stats_size;
>
> +               memset(&stats, 0, sizeof(stats));
> +

xsk.c doesn't include linux/string.h directly, so using memset may break
build for some config combinations. We can probably just use

struct xdp_statistics stats = {};

Thanks,
Song


>                 if (len < sizeof(struct xdp_statistics_v1)) {
>                         return -EINVAL;
>                 } else if (len < sizeof(stats)) {
> --
> 2.25.1
>