From: Daniel Borkmann <daniel@iogearbox.net>
To: "Peilin Ye" <yepeilin.cs@gmail.com>,
"Song Liu" <songliubraving@fb.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
"Magnus Karlsson" <magnus.karlsson@intel.com>,
"Jonathan Lemon" <jonathan.lemon@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Martin KaFai Lau <kafai@fb.com>, Yonghong Song <yhs@fb.com>,
Andrii Nakryiko <andriin@fb.com>, KP Singh <kpsingh@chromium.org>,
linux-kernel-mentees@lists.linuxfoundation.org,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH net v2] xdp: Prevent kernel-infoleak in xsk_getsockopt()
Date: Tue, 28 Jul 2020 12:53:59 +0200 [thread overview]
Message-ID: <916dbfd3-e601-c4be-41f0-97efc4aaa456@iogearbox.net> (raw)
In-Reply-To: <20200728053604.404631-1-yepeilin.cs@gmail.com>
On 7/28/20 7:36 AM, Peilin Ye wrote:
> xsk_getsockopt() is copying uninitialized stack memory to userspace when
> `extra_stats` is `false`. Fix it.
>
> Fixes: 8aa5a33578e9 ("xsk: Add new statistics")
> Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
> ---
> Doing `= {};` is sufficient since currently `struct xdp_statistics` is
> defined as follows:
>
> struct xdp_statistics {
> __u64 rx_dropped;
> __u64 rx_invalid_descs;
> __u64 tx_invalid_descs;
> __u64 rx_ring_full;
> __u64 rx_fill_ring_empty_descs;
> __u64 tx_ring_empty_descs;
> };
>
> When being copied to the userspace, `stats` will not contain any
> uninitialized "holes" between struct fields.
I've added above explanation to the commit log since it's useful reasoning for later
on 'why' something has been done a certain way. Applied, thanks Peilin!
next prev parent reply other threads:[~2020-07-28 10:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 2:28 [Linux-kernel-mentees] [PATCH net] " Peilin Ye
2020-07-28 5:07 ` Song Liu
2020-07-28 5:25 ` Peilin Ye
2020-07-28 5:36 ` [Linux-kernel-mentees] [PATCH net v2] " Peilin Ye
2020-07-28 6:13 ` Björn Töpel
2020-07-28 6:15 ` Song Liu
2020-07-28 7:34 ` Arnd Bergmann
2020-07-28 10:53 ` Daniel Borkmann [this message]
2020-07-28 11:07 ` Peilin Ye
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