From: Peilin Ye <yepeilin.cs@gmail.com>
To: "Song Liu" <songliubraving@fb.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
"Magnus Karlsson" <magnus.karlsson@intel.com>,
"Jonathan Lemon" <jonathan.lemon@gmail.com>
Cc: Peilin Ye <yepeilin.cs@gmail.com>,
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>,
Daniel Borkmann <daniel@iogearbox.net>,
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: [Linux-kernel-mentees] [PATCH net v2] xdp: Prevent kernel-infoleak in xsk_getsockopt()
Date: Tue, 28 Jul 2020 01:36:04 -0400 [thread overview]
Message-ID: <20200728053604.404631-1-yepeilin.cs@gmail.com> (raw)
In-Reply-To: <20200728022859.381819-1-yepeilin.cs@gmail.com>
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.
Changes in v2:
- Remove the "Cc: stable@vger.kernel.org" tag. (Suggested by Song Liu
<songliubraving@fb.com>)
- Initialize `stats` by assignment instead of using memset().
(Suggested by Song Liu <songliubraving@fb.com>)
net/xdp/xsk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 26e3bba8c204..b2b533eddebf 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -840,7 +840,7 @@ static int xsk_getsockopt(struct socket *sock, int level, int optname,
switch (optname) {
case XDP_STATISTICS:
{
- struct xdp_statistics stats;
+ struct xdp_statistics stats = {};
bool extra_stats = true;
size_t stats_size;
--
2.25.1
next prev parent reply other threads:[~2020-07-28 5:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 2:28 [Linux-kernel-mentees] [PATCH net] xdp: Prevent kernel-infoleak in xsk_getsockopt() Peilin Ye
2020-07-28 5:07 ` Song Liu
2020-07-28 5:25 ` Peilin Ye
2020-07-28 5:36 ` Peilin Ye [this message]
2020-07-28 6:13 ` [Linux-kernel-mentees] [PATCH net v2] " Björn Töpel
2020-07-28 6:15 ` Song Liu
2020-07-28 7:34 ` Arnd Bergmann
2020-07-28 10:53 ` Daniel Borkmann
2020-07-28 11:07 ` Peilin Ye
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